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REGISTRO BRASILEIRO
DE NAVIOS E AERONAVES
RGMM14EN
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
-A
PART II
RULES FOR THE CONSTRUCTION
AND CLASSIFICATION OF SHIPS
IDENTIFIED BY THEIR MISSION
TITLE 33
CHEMICAL TANKERS
INTERNATIONAL
CODE
FOR
THE
CONSTRUCTION AND EQUIPMENT OF SHIPS
CARRYING DANGEROUS CHEMICASL IN BULK,
1983, AS AMENDED 2004
ANNEX 1 – SPECIAL REQUIREMENTS
CHAPTERS
RULES 2014
A
SPECIAL REQUIREMENTS – EQUIPMENT
AND SYSTEMS
B
SPECIAL REQUIREMENTS – REQUIREMENTS
FOR CERTAIN PRODUCTS
C
SPECIAL REQUIREMENTS
CARGOES
–
MIXED
C4
A1-1
REGISTRO BRASILEIRO
DE NAVIOS E AERONAVES
RGMM14EN
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
RULES 2014
A1-2
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
-A
REGISTRO BRASILEIRO
DE NAVIOS E AERONAVES
RGMM14EN
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
-A
CONTENTS
CHAPTER A (15) ..............................................................5
SPECIAL REQUIREMENTS – EQUIPMENT AND
SYSTEMS ...........................................................................5
A1.
15 SPECIAL REQUIREMENTS – PART I ...5
100.
15.1 General ..................................................5
200.
less)
15.2 Ammonium nitrate solution (93% or
5
300.
15.3 Carbon disulphide ..................................5
400.
15.4 Diethyl ether ..........................................7
500.
15.5 Hydrogen peroxide solutions .................7
600.
15.6 Motor fuel anti-knock compounds
(containing lead alkyls) ............................................. 11
700.
15.7 Phosphorus, yellow or white ................ 11
800.
15.8 Propylene oxide or ethylene
oxide/propylene oxide mixtures with an ethylene
oxide content of not more than 30% by mass ............ 12
900.
15.9 Sodium chlorate solution (50% or less
by mass) .................................................................... 14
A2.
SPECIAL REQUIREMENTS – PART II..... 14
100.
15.10 Sulphur (molten) ................................ 14
200.
15.11 Acids .................................................. 15
300.
15.12 Toxic products .................................... 15
400.
15.13 Cargoes protected by additives .......... 15
500.
15.14 argoes with a vapour pressure greater
than 0.1013 MPa absolute at 37.8°C ........................ 16
600.
15.16 argo contamination ........................... 17
700.
15.17 Increased ventilation requirements .... 17
800.
15.18 Special cargo pump-room
requirements ............................................................. 17
900.
A3.
15.19 Overflow control ................................ 17
SPECIAL REQUIREMENTS – PART III .. 18
100.
15.20 Alkyl (C7-C9) nitrates, all isomers .... 18
200.
15.21 Temperature sensors .......................... 18
RULES 2014
A1-3
REGISTRO BRASILEIRO
DE NAVIOS E AERONAVES
RGMM14EN
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
RULES 2014
A1-4
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
-A
REGISTRO BRASILEIRO
DE NAVIOS E AERONAVES
RGMM14EN
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
CHAPTER A (15)
SPECIAL REQUIREMENTS – EQUIPMENT AND
SYSTEMS
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
-A
narrow-range indicator paper or stick. Acidity
measurements shall then be taken every 24 hours. If the
pH is found to be below 4.2, ammonia gas shall be injected
into the cargo until the pH of 5.0 is reached.
CHAPTER CONTENTS
A.1
SPECIAL REQUIREMENTS PART I
A.2
SPECIAL REQUIREMENTS – PART II
A3.
SPECIAL REQUIREMENTS – PART III
206. 15.2.6 A fixed installation shall be provided to
inject ammonia gas into the cargo. Controls for this system
shall be located on the navigation bridge. For this purpose,
300 kg of ammonia per 1,000 tonnes of ammonium nitrate
solution shall be available on board.
207. 15.2.7 Cargo pumps shall be of the centrifugal
deepwell type or of the centrifugal type with water flushed
seals
A1.
15
SPECIAL REQUIREMENTS – PART I
100.
15.1
General
208. 15.2.8 Vent piping shall be fitted with approved
weatherhoods to prevent clogging. Such weatherhoods
shall be accessible for inspection and cleaning.
101. 15.1.1 The provisions of this chapter are applicable
where specific reference is made in column o in the table
of ANNEX III (chapter 17). These requirements are
additional to the general requirements of the Code.
200.
15.2
209. 15.2.9 Hot work on tanks, piping and equipment
which have been in contact with ammonium nitrate
solution shall only be done after all traces of ammonium
nitrate have been removed, inside as well as outside.
Ammonium nitrate solution (93% or less)
300.
201. 15.2.1 The ammonium nitrate solution shall contain
at least 7% by weight of water. The acidity (pH) of the
cargo when diluted with ten parts of water to one part of
cargo by weight shall be between 5.0 and 7.0. The solution
shall not contain more than 10 ppm chloride ions, 10 ppm
ferric ions and shall be free of other contaminants.
15.3
Carbon disulphide
Note 1: Carbon disulphide may be carried either under a
water pad or under a suitable inert gas pad as specified in
the following paragraphs.
Note 2: Carriage under water pad
202. 15.2.2 Tanks and equipment for ammonium nitrate
solution shall be independent of tanks and equipment
containing other cargoes or combustible products.
Equipment which may, in service or when defective,
release combustible products into the cargo (e.g.
lubricants), shall not be used. Tanks shall not be used for
seawater ballast.
301. 15.3.1 Provision shall be made to maintain a water
pad in the cargo tank during loading, unloading and transit.
In addition, an inert-gas pad shall be maintained in the
ullage space during transit.
203. 15.2.3 Except where expressly approved by the
Administration, ammonium nitrate solutions shall not be
transported in tanks which have previously contained other
cargoes unless tanks and associated equipment have been
cleaned to the satisfaction of the Administration.
303. 15.3.3 Loading lines shall terminate near the
bottom of the tank.
204. 15.2.4 The temperature of the heat-exchanging
medium in the tank heating system shall not exceed
160°C. The heating system shall be provided with a
control system to keep the cargo at a bulk mean
temperature of 140°C. High-temperature alarms at 145°C
and 150°C and a low temperature alarm at 125°C shall be
provided. Where the temperature of the heat-exchanging
medium exceeds 160°C, an alarm shall also be given.
Temperature alarms and controls shall be located on the
navigating bridge.
305. 15.3.5 Cargo piping and vent lines shall be
independent of piping and vent lines used for other cargo.
205. 15.2.5 If the bulk mean cargo temperature reaches
145°C, a cargo sample shall be diluted with ten parts of
distilled or demineralized water to one part of cargo by
weight and the pH shall be determined by means of a
RULES 2014
302. 15.3.2 All openings shall be in the top of the tank,
above the deck.
304. 15.3.4 A standard ullage opening shall be provided
for emerge
306. 15.3.6 Pumps may be used for discharging cargo,
provided they are of the deepwell or hydraulically driven
submersible types. The means of driving a deepwell pump
shall not present a source of ignition for carbon disulphide
and shall not employ equipment that may exceed a
temperature of 80°C.
307. 15.3.7 If a cargo discharge pump is used, it shall be
inserted through a cylindrical well extending from the tank
top to a point near the tank bottom. A water pad shall be
formed in this well before attempting pump removal
unless the tank has been certified as gas-free
A1-5
REGISTRO BRASILEIRO
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RGMM14EN
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
308. 15.3.8 Water or inert-gas displacement may be
used for discharging cargo, provided the cargo system is
designed for the expected pressure and temperature.
309. 15.3.9 Safety relief valves shall be of stainless steel
construction
310. 15.3.10
Because of its low ignition
temperature and close clearances required to arrest its
flame propagation, only intrinsically safe systems and
circuits are permitted in the hazardous locations.
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
-A
shall be set at 80°C. The pump shall also be fitted with an
automatic shut-down device to be activated if the tank
pressure falls below atmospheric pressure during the
discharge.
319. 15.3.19
Air shall not be allowed to enter the
cargo tank, cargo pump or lines while carbon disulphide is
contained in the system.
320. 15.3.20
No other cargo handling, tank
cleaning or deballasting shall take place concurrent with
loading or discharge of carbon disulphide.
Note 3: Carriage under suitable inert gas pad
311. 15.3.11
Carbon disulphide shall be carried in
independent tanks with a design pressure of not less than
0.06 MPa gauge.
312. 15.3.12
All openings shall be located on the
top of the tank, above the deck.
313. 15.3.13
Gaskets used in the containment
system shall be of a material which does not react with, or
dissolve in, carbon disulphide.
314. 15.3.14
Threaded joints shall not be permitted
in the cargo containment system, including the vapour
lines.
315. 15.3.15
Prior to loading, the tank(s) shall be
inerted with suitable inert gas until the oxygen level is 2%
by volume or lower. Means shall be provided to
automatically maintain a positive pressure in the tank
using suitable inert gas during loading, transport and
discharge. The system shall be able to maintain this
positive pressure between 0.01 and 0.2 bar, and shall be
remotely monitored and fitted with over/underpressure
alarms.
316. 15.3.16
Hold
spaces
surrounding
an
independent tank carrying carbon disulphide shall be
inerted by a suitable inert gas until the oxygen level is 2%
or less. Means shall be provided to monitor and maintain
this condition throughout the voyage. Means shall also be
provided to sample these spaces for carbon disulphide
vapour.
321. 15.3.21
A water spray system of sufficient
capacity shall be provided to blanket effectively the area
surrounding the loading manifold, the exposed deck piping
associated with product handling and the tank domes. The
arrangement of piping and nozzles shall be such as to give
an uniform distribution rate of 10 l/m2/min. Remote
manual operation shall be arranged such that remote
starting of pumps supplying the water-spray system and
remote operation of any normally closed valves in the
system can be carried out from a suitable location outside
the cargo area adjacent to the accommodation spaces and
readily accessible and operable in the event of fire in the
areas protected. The water spray system shall be capable
of both local and remote manual operation, and the
arrangement shall ensure that any spilled cargo is washed
away. Additionally, a water hose with pressure to the
nozzle when atmospheric temperature permits, shall be
connected ready for immediate use during loading and
unloading operations.
322. 15.3.22
No cargo tanks shall be more than
98% liquid-full at the reference temperature (R).
323. 15.3.23
The maximum volume (VL) of cargo
to be loaded in a tank shall be:
VL = 0.98 V ×[ρR/ρL ]
where:
V
= volume of the tank
ρR
= density of cargo at the reference temperature
(R)
ρL
=
density of cargo at the loading temperature
R
317. 15.3.17
Carbon disulphide shall be loaded,
transported and discharged in such a manner that venting
to the atmosphere does not occur. If carbon disulphide
vapour is returned to shore during loading or to the ship
during discharge, the vapour return system shall be
independent of all other containment systems.
318. 15.3.18
Carbon
disulphide
shall
be
discharged only by submerged deepwell pumps or by a
suitable inert gas displacement. The submerged deepwell
pumps shall be operated in a way that prevents heat buildup in the pump. The pump shall also be equipped with a
temperature sensor in the pump housing with remote
readout and alarm in the cargo control room. The alarm
324. 15.3.24
The maximum allowable tank filling
limits for each cargo shall be indicated for each loading
temperature which may be applied, and for the applicable
maximum reference temperature, on a list approved by the
Administration. A copy of the list shall be permanently
kept on board by the master.
325. 15.3.25
Zones on open deck, or semienclosed spaces on open deck within three metres of a tank
outlet, gas or vapour outlet, cargo pipe flange or cargo
valve of a tank certified to carry carbon disulphide, shall
comply with the electrical equipment requirements
specified for carbon disulphide in column i, chapter 17.
RULES 2014
A1-6
= reference temperature
REGISTRO BRASILEIRO
DE NAVIOS E AERONAVES
RGMM14EN
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
Also, within the specified zone, no other heat sources, like
steam piping with surface temperatures in excess of 80°C
shall be allowed.
326. 15.3.26
Means shall be provided to ullage
and sample the cargo without opening the tank or
disturbing the positive suitable inert gas blanket.
327. 15.3.27
The product shall be transported only
in accordance with a cargo handling plan that has been
approved by the Administration. Cargo handling plans
shall show the entire cargo piping system. A copy of the
approved cargo handling plan shall be available on board.
The International Certificate of Fitness for the Carriage of
Dangerous Chemicals in Bulk shall be endorsed to include
reference to the approved cargo handling plan.
400.
15.4
Diethyl ether
c.
15.5.1.3
Pump-rooms shall not be used for
cargo-transfer operations.
d.
15.5.1.4
Cargo tanks shall be separated by
cofferdams from oil fuel tanks or any other space
containing flammable or combustible materials.
e.
15.5.1.5
Tanks intended for the carriage of
hydrogen peroxide shall not be used for seawater
ballast.
f.
15.5.1.6
Temperature sensors shall be
installed at the top and bottom of the tank. Remote
temperature readouts and continuous monitoring
shall be located on the navigating bridge. If the
temperature in the tanks rises above 35°C, visible
and audible alarms shall be activated on the
navigating bridge.
g.
15.5.1.7
Fixed oxygen monitors (or gassampling lines) shall be provided in void spaces
adjacent to tanks to detect leakage of the cargo into
these spaces. Remote readouts, continuous
monitoring (if gas-sampling lines are used,
intermittent sampling is satisfactory) and visible
and audible alarms similar to those for the
temperature sensors shall also be located on the
navigating bridge. The visible and audible alarms
shall be activated if the oxygen concentration in
these void spaces exceeds 30% by volume. Two
portable oxygen monitors shall also be available as
back-up systems.
h.
15.5.1.8
As a safeguard against uncontrolled
decomposition, a cargo-jettisoning system shall be
installed to discharge the cargo overboard. The
cargo shall be jettisoned if the temperature rise of
the cargo exceeds a rate of 2°C per hour over a 5hour period or when the temperature in the tank
exceeds 40°C.
i.
15.5.1.9
Cargo tank venting systems shall
have pressure/vacuum-relief valves for normal
controlled venting, and rupture discs or a similar
device for emergency venting, should tank pressure
rise rapidly as a result of uncontrolled
decomposition. Rupture discs shall be sized on the
basis of tank design pressure, tank size and
anticipated decomposition rate.
j.
15.5.1.10
A fixed water-spray system shall be
provided for diluting and washing away any
concentrated hydrogen peroxide solution spilled on
deck. The areas covered by the water-spray shall
include the manifold/hose connections and the tank
402. 15.4.2 Pressure-relief-valve settings shall not be
less than 0.2 bar gauge for gravity tanks.
403. 15.4.3 Inert-gas displacement may be used for
discharging cargo from pressure tanks provided the cargo
system is designed for the expected pressure.
404. 15.4.4 In view of the fire hazard, provision shall be
made to avoid any ignition source or heat generation or
both in the cargo area.
406. 15.4.6 Provision shall be made to maintain the
inert-gas pad in the cargo tank during loading, unloading
and transit.
500.
15.5
Hydrogen peroxide solutions
501. 15.5.1 Hydrogen peroxide solutions over 60%
but not over 70% by mass
a.
15.5.1.1
Hydrogen peroxide solutions over
60% but not over 70% by mass shall be carried in
dedicated ships only and no other cargoes shall be
carried.
b.
15.5.1.2
Cargo
tanks
and
associated
equipment shall be either pure aluminium (99.5%)
or solid stainless steel (304L, 316, 316L or 316Ti),
and passivated in accordance with approved
RULES 2014
- Title 33
- ANNEX 1
-A
procedures. Aluminium shall not be used for piping
on deck. All nonmetallic materials of construction
for the containment system shall neither be attacked
by hydrogen peroxide nor contribute to its
decomposition.
401. 15.4.1 Unless inerted, natural ventilation shall be
provided for the voids around the cargo tanks while the
vessel is under way. If a mechanical ventilation system is
installed, all blowers shall be of non-sparking construction.
Mechanical ventilation equipment shall not be located in
the void spaces surrounding the cargo tanks.
405. 15.4.5 Pumps may be used for discharging cargo,
provided that they are of a type designed to avoid liquid
pressure against the shaft gland or are of a hydraulically
operated submerged type and are suitable for use with the
cargo.
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
A1-7
REGISTRO BRASILEIRO
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RGMM14EN
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
- Title 33
- ANNEX 1
-A
tops of those tanks designated for carrying
hydrogen peroxide solutions. The minimum
application rate shall satisfy the following criteria:
b.1.
.1
When hydrogen peroxide is carried
no other cargoes shall be carried
simultaneously.
j.1.
.1
The product shall be diluted from the
original concentration to 35% by mass
within 5 minutes of the spill.
b.2.
.2
Tanks
which
have
contained
hydrogen peroxide may be .used for other
cargoes after cleaning in accordance with
the procedures outlined in MSC/Circ.394.
j.2.
.2
The rate and estimated size of the
spill shall be based
b.3.
.3
Consideration in design shall provide
minimum internal tank structure, free
draining, no entrapment and ease of visual
inspection.
k.
l.
m.
upon maximum anticipated loading and
discharge rates, the time required to stop
flow of cargo in the event of tank overfill or
a piping/hose failure, and the time necessary
to begin application of dilution water with
actuation at the cargo control location or on
the navigating bridge.
15.5.1.11
Only those hydrogen peroxide
solutions which have a maximum
decomposition rate of 1% per year at 25°C
shall be carried. Certification from the
shipper that the product meets this standard
shall be presented to the master and kept on
board. A technical representative of the
manufacturer shall be on board to monitor
the transfer operations and have the
capability to test the stability of the
hydrogen peroxide. He shall certify to the
master that the cargo has been loaded in a
stable condition.
15.5.1.12
Protective clothing that is
resistant to hydrogen peroxide solutions
shall be provided for each crew member
involved in cargo-transfer operations.
Protective
clothing
shall
include
nonflammable coveralls, suitable gloves,
boots and eye protection.
c.
15.5.2.3
Cargo
tanks
and
associated
equipment shall be either pure aluminium (99.5%)
or solid stainless steel of types suitable for use with
hydrogen peroxide (e.g. 304, 304L, 316, 316L,
316Ti). Aluminium shall not be used for piping on
deck. All non-metallic materials of construction for
the containment system shall neither be attacked by
hydrogen peroxide nor contribute to its
decomposition.
d.
15.5.2.4
Cargo tanks shall be separated by a
cofferdam from fuel oil tanks or any other space
containing materials incompatible with hydrogen
peroxide.
e.
15.5.2.5
Temperature sensors shall be
installed at the top and bottom of the tank. Remote
temperature readouts and continuous monitoring
shall be located on the navigating bridge. If the
temperature in the tank rises above 35°C, visible
and audible alarms shall activate on the navigating
bridge.
f.
15.5.2.6
Fixed oxygen monitors (or gassampling lines) shall be provided in void spaces
adjacent to tanks to detect leakage of the cargo into
these spaces. The enhancement of flammability by
oxygen enrichment shall be recognized. Remote
readouts, continuous monitoring (if gas-sampling
lines are used, intermittent sampling is satisfactory)
and visible and audible alarms similar to those for
the temperature sensors shall also be located on the
navigating bridge. The visible and audible alarms
shall activate if the oxygen concentration in these
void spaces exceeds 30% by volume. Two portable
oxygen monitors shall also be available as back up
systems.
g.
15.5.2.7
As a safeguard against uncontrolled
decomposition, a cargo-jettisoning system shall be
installed to discharge the cargo overboard. The
cargo shall be jettisoned if the temperature rise of
the cargo exceeds a rate of 2°C per hour over a 5hour period or when the temperature in the tank
exceeds 40°C.
502. 15.5.2 Hydrogen peroxide solutions over 8% but
not over 60% by mass
a.
15.5.2.1
The ship's shell plating shall not form
any boundaries of tanks containing this product.
b.
15.5.2.2
Hydrogen peroxide shall be carried in
tanks thoroughly and effectively cleaned of all
traces of previous cargoes and their vapours or
ballast. Procedures for inspection, cleaning,
passivation and loading of tanks shall be in
accordance with MSC/Circ.394. A certificate shall
be on board the vessel indicating that the
procedures in the circular have been followed. The
passivation requirement may be waived by an
Administration for domestic shipments of short
duration. Particular care in this respect is essential
to ensure the safe carriage of hydrogen peroxide:
RULES 2014
A1-8
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
REGISTRO BRASILEIRO
DE NAVIOS E AERONAVES
RGMM14EN
h.
i.
j.
k.
l.
m.
n.
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
15.5.2.8
Cargo tank venting systems with
filtration shall have pressure/vacuum-relief valves
for normal controlled venting, and a device for
emergency venting, should tank pressure rise
rapidly as a result of an uncontrolled decomposition
rate, as stipulated in A1.502.g (15.5.2.7). These
venting systems shall be designed in such a manner
that there is no introduction of seawater into the
cargo tank even under heavy sea conditions.
Emergency venting shall be sized on the basis of
tank design pressure and tank size.
15.5.2.9
A fixed water-spray system shall be
provided for diluting and washing away any
concentrated solution spilled on deck. The areas
covered by the water-spray shall include the
manifold/hose connections and the tank tops of
those tanks designated for the carriage of hydrogen
peroxide solutions. The minimum application rate
shall satisfy the following criteria:
.1
The product shall be diluted from the
original concentration to 35% by mass within 5
minutes of the spill.
.2
The rate and estimated size of the spill shall
be based upon maximum anticipated loading and
discharge rates, the time required to stop flow of
the cargo in the event of tank overfill or a
piping/hose failure, and the time necessary to begin
application of dilution water with actuation at the
cargo control location or on the navigating bridge.
15.5.2.10
Only those hydrogen peroxide
solutions which have a maximum decomposition
rate of 1% per year at 25°C shall be carried.
Certification from the shipper that the product
meets this standard shall be presented to the master
and kept on board. A technical representative of the
manufacturer shall be on board to monitor the
transfer operations and have the capability to test
the stability of the hydrogen peroxide. He shall
certify to the master that the cargo has been loaded
in a stable condition.
15.5.2.11
Protective clothing that is resistant to
hydrogen peroxide shall be provided for each crew
member involved in cargo-transfer operations.
Protective clothing shall include coveralls that are
nonflammable, suitable gloves, boots and eye
protection.
15.5.2.12
During transfer of hydrogen peroxide
the related piping system shall be separated from all
other systems. Cargo hoses used for transfer of
hydrogen peroxide shall be marked "FOR
HYDROGEN PEROXIDE TRANSFER ONLY".
RULES 2014
- Title 33
- ANNEX 1
-A
other cargoes, or for the carriage of other cargoes after the
carriage of hydrogen peroxide
a.
15.5.3.1
Tanks having contained cargoes other
than hydrogen peroxide shall be inspected, cleaned
and passivated before re-use for the transport of
hydrogen peroxide solutions. The procedures for
inspection and cleaning, as given in paragraphs
A1.503.b to A1.503.h (15.5.3.2 to 15.5.3.8) below,
apply to both stainless steel and pure aluminium
tanks (see paragraph A1.502.b). Procedures for
passivation are given in paragraph A1.503.i
(15.5.3.9) for stainless steel and A1.503.j
(15.5.3.10) for aluminium. Unless otherwise
specified, all steps apply to the tanks and to all
associated equipment having been in contact with
the other cargo.
b.
15.5.3.2
After unloading the previous cargo
the tank shall be rendered safe and inspected for
any residues, scale and rust.
c.
15.5.3.3
Tanks and associated equipment shall
be washed with clean filtered water. The water to
be used shall at least have the quality of potable
water with a low chlorine content.
d.
15.5.3.4
Trace residues and vapours of the
previous cargo shall be removed by steaming of
tank and equipment.
e.
15.5.3.5
Tank and equipment are washed
again with clean water (quality as above) and dried,
using filtered, oil-free air.
f.
15.5.3.6
The atmosphere in the tank shall be
sampled and investigated for the presence of
organic vapours and oxygen concentration.
g.
15.5.3.7
The tank shall be checked again by
visual inspection for residues of the previous cargo,
scale and rust as well as for any smell of the
previous cargo.
h.
15.5.3.8
If inspection or measurements
indicate the presence of residues of the previous
cargo or its vapours, actions described in
paragraphs A1.503.c to A1.503.e (15.5.3.3 to
15.5.3.5) shall be repeated.
i.
15.5.3.9
Tank and equipment made from
stainless steel which have contained other cargoes
than hydrogen peroxide or which have been under
repair shall be cleaned and passivated, regardless of
any previous passivation, according to the
following procedure:
i.1.
503. 15.5.3 Procedures for inspection, cleaning,
passivation and loading of tanks for the carriage of
hydrogen peroxide solutions 8-60%, which have contained
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
.1
New welds and other repaired parts
shall be cleaned and finished using stainless
steel wire brush, chisel, sandpaper or buff.
A1-9
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RGMM14EN
Rules for the Construction and Classification of Ships
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Rough surfaces shall be given a smooth
finish. A final polishing is necessary.
i.2.
i.3.
.2
Fatty and oily residues shall be
removed by the use of appropriate organic
solvents or detergent solutions in water. The
use of chlorine-containing compounds shall
be avoided as they can seriously interfere
with passivation.
.3
The residues of the degreasing agent
shall be removed, followed by a washing
with water.
i.4.
.4
In the next step, scale and rust shall
be removed by the application of acid (e.g. a
mixture of nitric and hydrofluoric acids),
followed again by a washing with clean
water.
i.5.
.5
All the metal surfaces which can
come into contact with hydrogen peroxide
shall be passivated by the application of
nitric acid of a concentration between 10 and
35% by mass. The nitric acid must be free
from heavy metals, other oxidizing agents or
hydrogen fluoride. The passivation process
shall continue for 8 to 24 h, depending upon
the concentration of acid, the ambient
temperature and other factors. During this
time a continuous contact between the
surfaces to be passivated and the nitric acid
shall be ensured. In the case of large
surfaces this may be achieved by
recirculating the acid. Hydrogen gas may be
evolved in the passivation process, leading
to the presence of an explosive atmosphere
in the tanks. Therefore, appropriate
measures must be taken to avoid the buildup or the ignition of such an atmosphere.
i.6.
i.7.
i.8.
.6
After passivation the surfaces shall be
thoroughly washed with clean filtered water.
The washing process shall be repeated until
the effluent water has the same pH value as
the incoming water.
.7
Surfaces treated according to the
above steps may cause some decomposition
when coming into contact with hydrogen
peroxide for the first time. This
decomposition will cease after a short time
(usually within two or three days). Therefore
an additional flushing with hydrogen
peroxide for a period of at least two days is
recommended.
.8
Only degreasing agents and acid
cleaning agents which have been
recommended for this purpose by the
manufacturer of the hydrogen peroxide shall
be used in the process.
j.
- Title 33
- ANNEX 1
-A
15.5.3.10 Tanks and equipment made from aluminium
and which have contained cargoes other than
hydrogen peroxide, or which have been under repair,
shall be cleaned and passivated. The following is an
example of a recommended procedure:
j.1.
.1
The tank shall be washed with a solution of
a sulphonated detergent in hot water, followed by a
washing with water.
j.2.
.2
The surface shall then be treated for 15 to 20
min with a solution of sodium hydroxide of a
concentration of 7% by mass or treated for a longer
period with a less concentrated solution (e.g. for 12
h with 0.4 to 0.5% sodium hydroxide). To prevent
excessive corrosion at the bottom of the tank when
treating with more concentrated solutions of
sodium hydroxide, water shall be added
continuously to dilute the sodium hydroxide
solution which collects there.
j.3.
.3
The tank shall be thoroughly washed with
clean, filtered water. As soon as possible after
washing, the surface shall be passivated by the
application of nitric acid of a concentration between
30 and 35% by mass. The passivation process shall
continue for 16 to 24 h. During this time a
continuous contact between the surfaces to be
passivated and the nitric acid shall be ensured.
j.4.
.4
After passivation the surfaces shall be
thoroughly washed with clean, filtered water. The
washing process shall be repeated until the effluent
water has the same pH value as the incoming water.
j.5.
.5
A visual inspection shall be made to ensure
that all surfaces have been treated. It is
recommended that an additional flushing is carried
out for a minimum of 24 h with dilute hydrogen
peroxide solution of a concentration approximately
3% by mass.
k.
15.5.3.11
The concentration and stability of the
hydrogen peroxide solution to be loaded shall be
determined.
l.
15.5.3.12
The hydrogen peroxide is loaded
under intermittent visual supervision of the interior
of the tank from an appropriate opening.
m.
15.5.3.13
If substantial bubbling is observed
which does not disappear within 15 min after the
completion of loading, the contents of the tank shall
be unloaded and disposed of in an environmentally
safe manner. The tank and equipment shall then be
repassivated as described above.
n.
15.5.3.14
The concentration and stability of the
hydrogen peroxide solution shall be determined
again. If the same values are obtained within the
RULES 2014
A1-10
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limits of error as in paragraph A1.503.j (15.5.3.10),
the tank is considered to be properly passivated and
the cargo ready for shipment.
o.
p.
15.5.3.15
Actions described in paragraphs
A1.503.b to A1.503.h (15.5.3.2 to 15.5.3.8) shall be
carried out under the supervision of the master or
shipper. Actions described in paragraphs A1.503.i
to A1.503.o (15.5.3.9 to 15.5.3.15) shall be carried
out under the on-site supervision and responsibility
of a representative of the hydrogen peroxide
manufacturer
or
under
supervision
and
responsibility of another person familiar with the
safety-relevant properties of hydrogen peroxide
15.5.3.16
The following procedure shall be
applied when tanks having contained hydrogen
peroxide solution are to be used for other products
(unless otherwise specified, all steps apply to the
tanks and to all associated equipment having been
in contact with hydrogen peroxide):
p.1.
.1 Hydrogen peroxide cargo residue shall be
drained as completely as possible from tanks
and equipment.
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
-A
602. 15.6.2 If a cargo pump-room is located on deck
level according to A2.800 (15.18), the ventilation
arrangements shall be in compliance with A2.700 (15.17).
603. 15.6.3 Entry into cargo tanks used for the
transportation of these cargoes is not permitted unless
approved by the Administration.
604. 15.6.4 Air analysis shall be made for lead content
to determine if the atmosphere is satisfactory prior to
allowing personnel to enter the cargo pump-room or void
spaces surrounding the cargo tank.
700.
15.7
Phosphorus, yellow or white
701. 15.7.1 Phosphorus shall, at all times, be loaded,
carried and discharged under a water pad of 760 mm
minimum
depth.
During
discharge
operations,
arrangements shall be made to ensure that water occupies
the volume of phosphorus discharged. Any water
discharged from a phosphorus tank shall be returned only
to a shore installation.
702. 15.7.2 Tanks shall be designed and tested to a
minimum equivalent water head of 2.4 m above the top of
the tank, under designed loading conditions, taking into
account the depth, relative density and method of loading
and discharge of the phosphorus.
p.2.
.2 Tanks and equipment shall be rinsed with
clean water, and subsequently thoroughly
washed with clean water.
p.3.
.3 The interior of the tank shall be dried and
inspected for any residues.
703. 15.7.3 Tanks shall be so designed as to minimize
the interfacial area between the liquid phosphorus and its
water pad
Steps .1 to .3, in A1.503.p (15.5.3.16), shall be carried out
under the supervision of the master or the shipper. Step. 3
in paragraph A1.503.p (15.5.3.16) shall be carried out by a
person familiar with the safety-relevant properties of the
chemical to be transported and of hydrogen peroxide.
704. 15.7.4 A minimum ullage space of 1% shall be
maintained above the water pad. The ullage space shall be
filled with inert gas or naturally ventilated by two cowled
standpipes terminating at different heights but at least 6 m
above the deck and at least 2 m above the pump-house top.
SPECIAL
CAUTIONS:
705. 15.7.5 All openings shall be at the top of cargo
tanks, and fittings and joints attached thereto shall be of
materials resistant to phosphorus pentoxide.
1 Hydrogen peroxide decomposition
may enrich the atmosphere with oxygen
and appropriate precautions shall be
observerd.
2 Hydrogen gas may be evolved in the
passivation processes described in
paragraphs 15.5.3.9.5, 15.5.3.10.2 and
A1.503.j.4 (15.5.3.10.4), leading to the
presence of an explosive atmosphere in
the tank. Therefore, appropriate
measures must be taken to avoid the
build-up or the ignition of such an
atmosphere.
600.
15.6 Motor fuel anti-knock compounds
(containing lead alkyls)
601. 15.6.1 Tanks used for these cargoes shall not be
used for the transportation of any other cargo except those
commodities to be used in the manufacture of motor fuel
anti-knock compounds containing lead alkyls.
RULES 2014
706. 15.7.6 Phosphorus shall be loaded at a temperature
not exceeding 60°C
707. 15.7.7 Tank heating arrangements shall be external
to tanks and have a suitable method of temperature control
to ensure that the temperature of the phosphorus does not
exceed 60°C. A high temperature alarm shall be fitted.
708. 15.7.8 A water drench system acceptable to the
Administration shall be installed in all void spaces
surrounding the tanks. The system shall operate
automatically in the event of an escape of phosphorus.
709. 15.7.9 Void spaces referred to in A1.708 (15.7.8)
shall be provided with effective means of mechanical
ventilation which shall be capable of being sealed off
quickly in an emergency.
A1-11
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710. 15.7.10
Loading and discharge of phosphorus
shall be governed by a central system on the ship which, in
addition to incorporating high-level alarms, shall ensure
that no overflow of tanks is possible and that such
operations can be stopped quickly in an emergency from
either ship or shore.
711. 15.7.11
During cargo transfer, a water hose
on deck shall be connected to a water supply and kept
flowing throughout the operation so that any spillage of
phosphorus may be washed down with water immediately.
712. 15.7.12
Ship-to-shore loading and discharge
connections shall be of a type approved by the
Administration.
800. 15.8 Propylene oxide or ethylene
oxide/propylene oxide mixtures with an ethylene oxide
content of not more than 30% by mass
801. 15.8.1 Products transported under the provisions of
this section shall be acetylene-free
802. 15.8.2 Unless cargo tanks are properly cleaned,
these products shall not be carried in tanks which have
contained as one of the three previous cargoes any
products known to catalyse polymerization, such as:
a.
.1
mineral acids (e.g. sulphuric, hydrochloric,
nitric);
b.
.2 carboxylic acids and anhydrides (e.g. formic,
acetic);
c.
.3 halogenated carboxylic acids (e.g. chloracetic);
d.
.4 sulphonic acids (e.g. benzenesulphonic);
e.
.5 caustic alkalis (e.g. sodium hydroxide, potassium
hydroxide);
f.
.6 ammonia and ammonia solutions;
g.
.7 amines and amine solutions; and
h.
.8 oxidizing substances.
803. 15.8.3 Before loading, tanks shall be thoroughly
and effectively cleaned, to remove all traces of previous
cargoes from tanks and associated pipework, except where
the immediately prior cargo has been propylene oxide or
ethylene oxide/propylene oxide mixtures. Particular care
shall be taken in the case of ammonia in tanks made of
steel other than stainless steel.
804. 15.8.4 In all cases, the effectiveness of cleaning
procedures for tanks and associated pipework shall be
checked by suitable testing or inspection, to ascertain that
no traces of acidic or alkaline materials remain that might
create a hazardous situation in the presence of these
products.
- Title 33
- ANNEX 1
-A
805. 15.8.5 Tanks shall be entered and inspected prior to
each initial loading of these products to ensure freedom
from contamination, heavy rust deposits and visible
structural defects. When cargo tanks are in continuous
service for these products, such inspections shall be
performed at intervals of not more than two years.
806. 15.8.6 Tanks for the carriage of these products shall
be of steel or stainless steel construction.
807. 15.8.7 Tanks for the carriage of these products may
be used for other cargoes after thorough cleaning of tanks
and associated pipework systems by washing or purging.
808. 15.8.8 All valves, flanges, fittings and accessory
equipment shall be of a type suitable for use with the
products and shall be constructed of steel or stainless steel
in accordance with recognized standards. Discs or disc
faces, seats and other wearing parts of valves shall be
made of stainless steel containing not less than 11%
chromium.
809. 15.8.9 Gaskets shall be constructed of materials
which do not react with, dissolve in, or lower the
autoignition temperature of these products and which are
fire-resistant and possess adequate mechanical behaviour.
The surface presented to the cargo shall be
polytetrafluoroethylene (PTFE), or materials giving a
similar degree of safety by their inertness. Spirally wound
stainless steel, with a filler of PTFE or similar fluorinated
polymer, may be accepted.
810. 15.8.10
Insulation and packing, if used, shall
be of a material which does not react with, dissolve in, or
lower the autoignition temperature of these products.
811. 15.8.11
The following materials are generally
found unsatisfactory for gaskets, packing and similar uses
in containment systems for these products and would
require testing before being approved by the
Administration:
a.
.1
neoprene or natural rubber, if it comes into
contact with the products.
b.
.2
c.
.3 materials containing oxides of magnesium, such
as mineral wools.
asbestos, or binders used with asbestos.
812. 15.8.12
Threaded joints shall not be permitted
in the cargo liquid and vapour lines.
813. 15.8.13
Filling and discharge piping shall
extend to within 100 mm of the bottom of the tank or any
sump pit.
814. 15.8.14.1
The containment system for a tank
containing these products shall have a valved vapour
return connection.
RULES 2014
A1-12
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815. 15.8.14.2
The products shall be loaded and
discharged in such a manner that venting of the tanks to
atmosphere does not occur. If vapour return to shore is
used during tank loading, the vapour-return system
connected to a containment system for the product shall be
independent of all other containment systems.
816. 15.8.14.3
During discharge operations, the
pressure in the cargo tank must be maintained above 0.007
MPa gauge.
817. 15.8.15
The cargo may be discharged only by
deepwell pumps, hydraulically operated submerged
pumps, or inert-gas displacement. Each cargo pump shall
be arranged to ensure that the product does not heat
significantly if the discharge line from the pump is shut off
or otherwise blocked.
818. 15.8.16
Tanks carrying these products shall
be vented independently of tanks carrying other products.
Facilities shall be provided for sampling the tank contents
without opening the tank to atmosphere.
819. 15.8.17
Cargo hoses used for transfer of these
products shall be marked "FOR ALKYLENE OXIDE
TRANSFER ONLY".
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
-A
gauge shall have a cooling system to maintain the cargo
below the reference temperature.
825. 15.8.22.2
The refrigeration requirement for
tanks with a design pressure less than 0.06 MPa gauge
may be waived by the Administration for ships operating
in restricted areas or on voyages of restricted duration, and
account may be taken in such cases of any insulation of the
tanks. The area and times of year for which such carriage
would be permitted shall be included in the conditions of
carriage of the International Certificate of Fitness for the
Carriage of Dangerous Chemicals in Bulk.
826. 15.8.23.1
Any cooling system shall maintain
the liquid temperature below the boiling temperature at the
containment pressure. At least two complete cooling
plants, automatically regulated by variations within the
tanks, shall be provided. Each cooling plant shall be
complete with the necessary auxiliaries for proper
operation. The control system shall also be capable of
being manually operated. An alarm shall be provided to
indicate malfunctioning of the temperature controls. The
capacity of each cooling system shall be sufficient to
maintain the temperature of the liquid cargo below the
reference temperature of the system.
820. 15.8.18
Cargo tanks, void spaces and other
enclosed spaces adjacent to an integral gravity cargo tank
carrying propylene oxide shall either contain a compatible
cargo (those cargoes specified in A1.802 (15.8.2) are
examples of substances considered incompatible) or be
inerted by injection of a suitable inert gas. Any hold space
in which an independent cargo tank is located shall be
inerted. Such inerted spaces and tanks shall be monitored
for these products and oxygen. The oxygen content of
these spaces shall be maintained below 2%. Portable
sampling equipment is satisfactory.
827. 15.8.23.2
An alternative arrangement may
consist of three cooling plants, any two of which shall be
sufficient to maintain the liquid temperature below the
reference temperature.
821. 15.8.19
In no case shall air be allowed to
enter the cargo pump or piping system while these
products are contained within the system.
830. 15.8.24
Pressure-relief-valve settings shall
not be less than 0.2 bar gauge and for pressure tanks not
greater than 0.7 MPa gauge for the carriage of propylene
oxide and not greater than 0.53 MPa gauge for the carriage
of propylene oxide/ethylene oxide mixtures.
822. 15.8.20
Prior to disconnecting shore-lines, the
pressure in liquid and vapour lines shall be relieved
through suitable valves installed at the loading header.
Liquid and vapour from these lines shall not be discharged
to atmosphere.
823. 15.8.21
Propylene oxide may be carried in
pressure tanks or in independent or integral gravity tanks.
Ethylene oxide/propylene oxide mixtures shall be carried
in independent gravity tanks or pressure tanks. Tanks shall
be designed for the maximum pressure expected to be
encountered during loading, conveying and discharging
cargo.
824. 15.8.22.1
Tanks for the carriage of propylene
oxide with a design pressure less than 0.06 MPa gauge and
tanks for the carriage of ethylene oxide/propylene oxide
mixtures with a design pressure of less than 0.12 MPa
RULES 2014
828. 15.8.23.3
Cooling media which are separated
from the products by a single wall only shall be
nonreactive with the products.
829. 15.8.23.4
Cooling
systems
compression of the products shall not be used.
requiring
831. 15.8.25.1
The piping system for tanks to be
loaded with these products shall be separated (as defined
in 3.1.4) from piping systems for all other tanks, including
empty tanks. If the piping system for the tanks to be
loaded is not independent, as defined in Part II, Title 33,
Section 1, A1.318 (1.3.18), the required piping separation
shall be accomplished by the removal of spool-pieces,
valves, or other pipe section and the installation of blank
flanges at these locations. The required separation applies
to all liquid and vapour piping, liquid and vapour vent
lines and any other possible connections, such as common
inert-gas supply lines.
832. 15.8.25.2
These products may be transported
only in accordance with cargo-handling plans that have
been approved by the Administration. Each intended
loading arrangement shall be shown on a separate cargoA1-13
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handling plan. Cargo-handling plans shall show the entire
cargo piping system and the locations for installation of
blank flanges needed to meet the above piping separation
requirements. A copy of each approved cargo-handling
plan shall be maintained on board the ship. The
International Certificate of Fitness for the Carriage of
Dangerous Chemicals in Bulk shall be endorsed to include
reference to the approved cargo-handling plans.
833. 15.8.25.3
Before each initial loading of these
products and before every subsequent return to such
service, certification verifying that the required piping
separation has been achieved shall be obtained from a
responsible person acceptable to the port Administration
and carried on board the ship. Each connection between a
blank flange and a pipeline flange shall be fitted with a
wire and seal by the responsible person to ensure that inadvertent removal of the blank flange is impossible.
834. 15.8.26.1
No cargo tanks shall be more than
98% liquid-full at the reference temperature.
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
-A
surrounding the loading manifold, the exposed deck piping
associated with product handling, and the tank domes. The
arrangement of piping and nozzles shall be such as to give
a uniform distribution rate of 10 l/m2/min. Remote manual
operation shall be arranged such that remote starting of
pumps supplying the water-spray system and remote
operation of any normally closed valves in the system can
be carried out from a suitable location outside the cargo
area, adjacent to the accommodation spaces and readily
accessible and operable in the event of fire in the areas
protected. The water spray system shall be capable of both
local and remote manual operation, and the arrangement
shall ensure that any spilled cargo is washed away.
Additionally, a water hose with pressure to the nozzle,
when atmospheric temperatures permit, shall be connected
ready for immediate use during loading and unloading
operations.
840. 15.8.30
A remotely operated, controlled
closing-rate, shutoff valve shall be provided at each cargo
hose connection used during cargo transfer.
835. 15.8.26.2
The maximum volume to which a
cargo tank shall be loaded is:
900.
VL = 0.98 V × [ρR / ρL ]
901. 15.9.1 Tanks and associated equipment, which
have contained this product may be used for other cargoes
after thorough cleaning by washing or purging.
where:
VL
V
=
=
ρR
maximum volume to which the tank may be
loaded
volume of the tank
= density of cargo at the reference temperature (R)
ρL
= density of cargo at the loading temperature
836. 15.8.26.3
The maximum allowable tank filling
limits for each cargo tank shall be indicated for each
loading temperature which may be applied and for the
applicable maximum reference temperature, on a list to be
approved by the Administration. A copy of the list shall be
permanently kept on board by the master.
837. 15.8.27
The cargo shall be carried under a
suitable protective padding of nitrogen gas. An automatic
nitrogen make-up system shall be installed to prevent the
tank pressure falling below 0.007 MPa gauge in the event
of product temperature fall due to ambient conditions or
maloperation of refrigeration systems. Sufficient nitrogen
shall be available on board to satisfy the demand of the
automatic pressure control. Nitrogen of commercially pure
quality (99.9% by volume) shall be used for padding. A
battery of nitrogen bottles connected to the cargo tanks
through a pressure-reduction valve satisfies the intention
of the expression "automatic" in this context.
15.9 Sodium chlorate solution (50% or less by
mass)
902. 15.9.2 In the event of spillage of this product, all
spilled liquid shall be thoroughly washed away without
delay. To minimize fire risk, spillage shall not be allowed
to dry out.
A2.
SPECIAL REQUIREMENTS – PART II
100.
15.10 Sulphur (molten)
101. 15.10.1
Cargo tank ventilation shall be
provided to maintain the concentration of hydrogen
sulphide below one half of its lower explosive limit
through-out the cargo tank vapour space for all conditions
of carriage (i.e. below 1.85% by volume).
102. 15.10.2
Where
mechanical
ventilation
systems are used for maintaining low gas concentrations in
cargo tanks, an alarm system shall be provided to give
warning if the system fails.
103. 15.10.3
Ventilation systems shall be so
designed and arranged as to preclude depositing of sulphur
within the system.
838. 15.8.28
The cargo tank vapour space shall be
tested prior to and after loading to ensure that the oxygen
content is 2% by volume or less.
104. 15.10.4
Openings to void spaces adjacent to
cargo tanks shall be so designed and fitted as to prevent
the entry of water, sulphur or cargo vapour.
839. 15.8.29
A water-spray system of sufficient
capacity shall be provided to blanket effectively the area
105. 15.10.5
Connections shall be provided to
permit sampling and analysing of vapour in void spaces
RULES 2014
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106. 15.10.6
Cargo temperature controls shall be
provided to ensure that the temperature of the sulphur does
not exceed 155°C
107. 15.10.7
Sulphur (molten) has a flashpoint
above 60°C ; however, electrical equipment shall be
certified safe for gases evolved.
200.
.2
not less than 6 m above the fore-and-aft
gangway, if fitted within 6 m of the gangway;
c.
.3
15 m from any opening or air intake to any
accommodation and service spaces; and
d.
.4
the vent height may be reduced to 3 m above
the deck or fore-and-aft gangway, as applicable,
provided high-velocity vent valves of an approved
type, directing the vapour/air mixture upwards in an
unimpeded jet with an exit velocity of at least 30
m/s, are fitted.
201. 15.11.1
The ship's shell plating shall not form
any boundaries of tanks containing mineral acids.
203. 15.11.3
Unless constructed wholly of
corrosion-resistant materials or fitted with an approved
lining, the plating thickness shall take into account the
corrosivity of the cargo
204. 15.11.4
Flanges of the loading and discharge
manifold connections shall be provided with shields,
which may be portable, to guard against the danger of the
cargo being sprayed; and in addition, drip trays shall also
be provided to guard against leakage on to the deck.
205. 15.11.5
Because of the danger of evolution of
hydrogen when these substances are being carried, the
electrical arrangements shall comply with Part II, Title 33,
Section 7, A2.104 (10.1.4). The certified safe type
equipment shall be suitable for use in hydrogen/air
mixtures. Other sources of ignition shall not be permitted
in such spaces.
206. 15.11.6
Substances
subjected
to
the
requirements of this section shall be segregated from oil
fuel tanks, in addition to the segregation requirements in
3.1.1.
302. 15.12.2
Tank venting systems shall be
provided with a connection for a vapour-return line to the
shore installation.
Guidance
5.12.2/15.14.4 (IACS' unified interpretation CC2
Interpretation of paragraph 4.9.2, BCH Code
(corresponds to paragraph 15.12.2 of the IBC Code)
(1977) (Rev.1 Feb 2007), and IACS' unified
interpretation CC3 Interpretation of paragraph 4.11.2,
BCH Code (corresponds to paragraph 15.14.4 of the IBC
Code) (1977) (Rev.1 Feb 2007):
This paragraph may be interpreted as follows in respect of
the provision of a stop valve for the connection of tank
venting systems with lines for the return of vapours to
shore plants:
'Tank venting systems should be provided with a stop valve
for vapour return line to shore.'
End of guidance
303.
15.12.3
a.
.1
b.
.2 have separate piping systems; and
c.
.3 have tank vent systems separate from tanks
containing non toxic products.
207. 15.11.7
Provision shall be made for suitable
apparatus to detect leakage of cargo into adjacent spaces.
208. 15.11.8
The cargo pump-room bilge pumping
and drainage arrangements shall be of corrosion resistant
materials.
300.
15.12 Toxic products
301. 15.12.1
Exhaust
systems shall be located:
a.
openings
of
tank
vent
.1
at a height of B/3 or 6 m, whichever is
greater, above the weather deck or, in the case of a
deck tank, the access gangway;
RULES 2014
- Title 33
- ANNEX 1
-A
b.
15.11 Acids
202. 15.11.2
Proposals for lining steel tanks and
related piping systems with corrosion-resistant materials
may be considered by the Administration. The elasticity of
the lining shall not be less than that of the supporting
boundary plating.
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
Products shall:
not be stowed adjacent to oil fuel tanks;
304. 15.12.4
Cargo tank relief-valve settings shall
be a minimum of 0.2 bar gauge.
400.
15.13 Cargoes protected by additives
401. 15.13.1
Certain cargoes with a reference in
column o in the table of ANNEX 17 (chapter 17), by the
nature of their chemical make-up, tend, under certain
conditions of temperature, exposure to air or contact with a
catalyst, to undergo polymerization, decomposition,
oxidation or other chemical changes. Mitigation of this
tendency is carried out by introducing small amounts of
chemical additives into the liquid cargo or controlling the
cargo tank environment.
A1-15
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Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
402. 15.13.2
Ships carrying these cargoes shall be
so designed as to eliminate from the cargo tanks and
cargo-handling system any material of construction or
contaminants which could act as a catalyst or destroy the
inhibitor.
403. 15.13.3
Care shall be taken to ensure that
these cargoes are sufficiently protected to prevent
deleterious chemical change at all times during the voyage.
Ships carrying such cargoes shall be provided with a
certificate of protection from the manufacturer, and kept
during the voyage, specifying:
a.
.1
the name and amount of additive present;
b.
.2
whether the additive is oxygen-dependent;
c.
.3
date additive was put in the product and
duration of effectiveness;
d.
.4
any temperature limitations qualifying the
additives' effective lifetime; and
e.
.5
the action to be taken shall the length of
voyage exceed the effective lifetime of the
additives.
404. 15.13.4
Ships using the exclusion of air as the
method of preventing oxidation of the cargo shall comply
with 9.1.3.
405. 15.13.5
A product containing an oxygendependent additive shall be carried without inertion (in
tanks of a size not greater than 3,000 m3). Such cargoes
shall not be carried in a tank requiring inertion under the
requirements of SOLAS chapter II-2. For equivalency
arrangements for the carriage of styrene monomer, see
MSC/Circ.879 and MSC/Circ.879/Corr.1
406. 15.13.6
Venting systems shall be of a design
that eliminates blockage from polymer build-up. Venting
equipment shall be of a type that can be checked
periodically for adequacy of operation.
500.
501. 15.14.1
For a cargo referenced in column o in
the table of ANNEX 17 (chapter 17) to this section, a
mechanical refrigeration system shall be provided unless
the cargo system is designed to withstand the vapour
pressure of the cargo at 45°C . Where the cargo system is
designed to withstand the vapour pressure of the cargo at
45°C , and no refrigeration system is provided, a notation
shall be made in the conditions of carriage on the
International Certificate of Fitness for the Carriage of
Dangerous Chemicals in Bulk to indicate the required
relief-valve setting for the tanks.
502. 15.14.2
A mechanical refrigeration system
shall maintain the liquid temperature below the boiling
temperature at the cargo tank design pressure.
503. 15.14.3
When ships operate in restricted areas
and at restricted times of the year, or on voyages of limited
duration, the Administration involved may agree to waive
requirements for a refrigeration system. A notation of any
such agreement, listing geographic area restrictions and
times of the year, or voyage duration limitations, shall be
included in the conditions of carriage on the International
Certificate of Fitness for the Carriage of Dangerous
Chemicals in Bulk.
504. 15.14.4
Connections shall be provided for
returning expelled gases to shore during loading.
505. 15.14.5
Each tank shall be provided with a
pressure gauge which indicates the pressure in the vapour
space above the cargo.
506. 15.14.6
Where the cargo needs to be cooled,
thermometers shall be provided at the top and bottom of
each tank.
507. 15.14.7.1
No cargo tanks shall be more than
98% liquid-full at the reference temperature (R).
15.14.7.2
The maximum volume (VL) of cargo
to be loaded in a tank shall be:
VL = 0.98 V × [ρR / ρL ]
where:
V
=
volume of the tank
ρR
= density of cargo at the reference temperature (R)
ρL
= density of cargo at the loading temperature
b.
15.14.7.3
The maximum allowable tank filling
limits for each cargo tank shall be indicated for
each loading temperature which may be applied,
and for the applicable maximum reference
temperature, on a list approved by the
Administration. A copy of the list shall be
permanently kept on board by the master.
RULES 2014
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15.14 argoes with a vapour pressure greater
than 0.1013 MPa absolute at 37.8°C
a.
407. 15.13.7
Crystallization or solidification of
cargoes normally carried in the molten state can lead to
depletion of inhibitor in parts of the tank's contents.
Subsequent remelting can thus yield pockets of uninhibited
liquid, with the accompanying risk of dangerous
polymerization. To prevent this, care shall be taken to
ensure that at no time are such cargoes allowed to
crystallize or solidify, either wholly or partially, in any
part of the tank. Any required heating arrangements shall
be such as to ensure that in no part of the tank does cargo
become overheated to such an extent that any dangerous
polymerization can be initiated. If the temperature from
steam coils would induce overheating, an indirect lowtemperature heating system shall be used
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
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600.
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
a.
.1
Air inlets to pressure/vacuum-relief valves
of tanks containing the cargo shall be situated at
least 2 m above the weather deck.
b.
.2
Water or steam shall not be used as the heattransfer media in a cargo temperature control
system required by Part II, Title 33, Section 6,
Chapter C (chapter 7).
d.
700.
.3
The cargo shall not be carried in cargo tanks
adjacent to permanent ballast or water tanks unless
the tanks are empty and dry.
.4
The cargo shall not be carried in tanks
adjacent to slop tanks or cargo tanks containing
ballast or slops or other cargoes containing water
which may react in a dangerous manner. Pumps,
pipes or vent lines serving such tanks shall be
separate from similar equipment serving tanks
containing the cargo. Pipelines from slop tanks or
ballast lines shall not pass through tanks containing
the cargo unless encased in a tunnel.
15.18 Special cargo pump-room requirements
801. For certain products, the cargo pump-room shall be
located on the deck level or cargo pumps shall be located
in the cargo tank. The Administration may give special
consideration to cargo pump-rooms below deck.
900.
904. 15.19.4
Level alarms shall be capable of
being tested prior to loading
905. 15.19.5
The high-level alarm system required
under A2.906 (15.19.6) shall be independent of the
overflow control system required by A2.907 (15.19.7) and
shall be independent of the equipment required by Part II,
Title 33, Section 6, G1.100 (13.1).
906. 15.19.6
Cargo tanks shall be fitted with a
visual and audible high-level alarm which complies with
15.19.1 to 15.19.5 and which indicates when the liquid
level in the cargo tank approaches the normal full
condition.
907. 15.19.7
A tank
required by this section shall:
15.19 Overflow control
901. 15.19.1
The provisions of this section are
applicable where specific reference is made in column o in
the table of ANNEX III (chapter 17), and are in addition to
the requirements for gauging devices.
overflow-control
system
a.
.1
come into operation when the normal tank
loading procedures fail to stop the tank liquid level
exceeding the normal full condition;
b.
.2
give a visual and audible tank-overflow
alarm to the ship's operator; and
c.
.3
provide an agreed signal for sequential
shutdown of onshore pumps or valves or both and
of the ship's valves. The signal, as well as the pump
and valve shutdown, may be dependent on
operator's intervention. The use of shipboard
automatic closing valves shall be permitted only
when specific approval has been obtained from the
Administration and the port State authority
concerned.
15.17 Increased ventilation requirements
701. For certain products, the ventilation system as
described in Part II, Title 33, Section 6, F1.103 (12.1.3)
shall have a minimum capacity of at least 45 changes of air
per hour, based upon the total volume of space. The
ventilation system exhaust ducts shall discharge at least 10
m away from openings into
accommodation spaces, work areas or other similar spaces,
and intakes to ventilation systems, and at least 4 m above
the tank deck.
800.
- Title 33
- ANNEX 1
-A
903. 15.19.3
Loading
operations
shall
be
terminated at once in the event of any system essential for
safe loading becoming inoperative.
15.16 argo contamination
601. 15.16.2
Where column o in the table of
chapter 17 refers to this section, water shall not be allowed
to contaminate this cargo. In addition, the following
provisions apply:
c.
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
908. 15.19.8
shall not exceed:
The loading rate (LR) of the tank
LR = 3600U/t
(m³/h)
where:
U =
t
ullage volume (m³) at operating signal level;
= time(s) needed from the initiating signal to fully
stopping the cargo flow into the tank, being the
sum of times needed for each step in sequential
operations such as operator's responses to signals,
stopping pumps and closing valves;
and shall also take into account the pipeline system design
pressure.
902. 15.19.2
In the event of a power failure on any
system essential for safe loading, an alarm shall be given
to the operators concerned.
RULES 2014
A1-17
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RGMM14EN
Rules for the Construction and Classification of Ships
Identified by their Missions – Part II
A3.
SPECIAL REQUIREMENTS – PART III
100.
15.20 Alkyl (C7-C9) nitrates, all isomers
101. 15.20.1
The carriage temperature of the cargo
shall be maintained below 100°C to prevent the occurrence
of a self- sustaining, exothermic decomposition reaction
102. 15.20.2
The cargo may not be carried in
independent pressure vessels permanently affixed to the
vessel's deck unless:
a.
.1
and
the tanks are sufficiently insulated from fire;
b.
.2
the vessel has a water deluge system for the
tanks such that the cargo temperature is maintained
below 100°C and the temperature rise in the tanks
does not exceed 1.5°C per hour for a fire of 650°C .
200.
15.21 Temperature sensors
201. Temperature sensors shall be used to monitor the
cargo pump temperature to detect overheating due to pump
failures.
Rgmm14en-PIIT33Annex1-a-00
RULES 2014
A1-18
CHEMICAL TANKERS
SPECIAL REQUIREMENTS
CHAPTERS
- Title 33
- ANNEX 1
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