Spirax Sarco Fig 18HP Butt weld Strainer Installation and Maintenance Instructions

1626450/1
IM-P162-04
ST Issue 1
Fig 18HP
Butt weld Strainer
Installation and Maintenance Instructions
1. Safety information
2. General
product information
3. Installation
4. Commissioning
5. Operation
6. Fault finding
7. Maintenance
8. Spare parts
Printed
in France
IM-P162-04
ST Issue 1
© Copyright 20111
1. Safety information
Safe operation of this product can only be guaranteed if it is properly installed,
commissioned, used and maintained by qualified personnel (see Section 1.11)
in compliance with the operating instructions. General installation and safety
instructions for pipeline and plant construction, as well as the proper use of tools
and safety equipment must also be complied with.
1.1 Intended use
Referring to the Installation and Maintenance Instructions, name-plate and
Technical Information Sheet, check that the product is suitable for the intended
use / application. The product listed below complies with the requirements of the
mark when
European Pressure Equipment Directive 97 / 23 / EC and carries the
so required. It should be noted that products rated as 'SEP' are required by the
Directive not to carry the
mark. The product falls within the following
Pressure Equipment Directive categories:
Product
Fig 18HP
Group 1
Gases
Group 2
Gases
Group 1
Liquids
Group 2
Liquids
DN15 - DN25
3
SEP
SEP
SEP
DN32
3
SEP
2
SEP
DN40 - DN50
3
1
2
SEP
i) This product has been specifically designed for use on air or water / condensate
which is in Group 2 gases and liquids of the above mentioned Pressure
Equipment Directive. It can also be used on steam, air or water / condensate
which is in Group 1 of the Pressure Equipment Directive. The products’ use on
other fluids may be possible but, if this is contemplated, Spirax Sarco should
be contacted to confirm the suitability of the product for the application being
considered.
ii) Check material suitability, pressure and temperature and their maximum and
minimum values. If the maximum operating limits of the product are lower than
those of the system in which it is being fitted, or if malfunction of the product
could result in a dangerous overpressure or overtemperature occurrence,
ensure a safety device is included in the system to prevent such over-limit
situations.
iii)Determine the correct installation situation and direction of fluid flow.
iv)Spirax Sarco products are not intended to withstand external stresses that
may be induced by any system to which they are fitted. It is the responsibility
of the installer to consider these stresses and take adequate precautions to
minimise them.
v) Remove protection covers from all connections and protective film from all
name-plates, where appropriate, before installation on steam or other high
temperature applications.
1.2 Access
Ensure safe access and if necessary a safe working platform (suitably guarded)
before attempting to work on the product. Arrange suitable lifting gear if required.
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1.3 Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.
1.4 Hazardous liquids or gases in the pipeline
Consider what is in the pipeline or what may have been in the pipeline at some
previous time. Consider: flammable materials, substances hazardous to health,
extremes of temperature.
1.5 Hazardous environment around the product
Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases,
extremes of temperature, hot surfaces, fire hazard (e.g. during welding),
excessive noise, moving machinery.
1.6 The system
Consider the effect on the complete system of the work proposed. Will any
proposed action (e.g. closing isolation valves, electrical isolation) put any other
part of the system or any personnel at risk?
Dangers might include isolation of vents or protective devices or the rendering
ineffective of controls or alarms. Ensure isolation valves are turned on and off
in a gradual way to avoid system shocks.
1.7 Pressure systems
Ensure that any pressure is isolated and safely vented to atmospheric pressure.
Consider double isolation (double block and bleed) and the locking or labelling
of closed valves. Do not assume that the system has depressurised even when
the pressure gauge indicates zero.
1.8 Temperature
Allow time for temperature to normalise after isolation to avoid danger of burns.
1.9 Tools and consumables
Before starting work ensure that you have suitable tools and / or consumables
available. Use only genuine Spirax Sarco replacement parts.
1.10 Protective clothing
Consider whether you and / or others in the vicinity require any protective
clothing to protect against the hazards of, for example, chemicals, high / low
temperature, radiation, noise, falling objects, and dangers to eyes and face.
1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person.
Installation and operating personnel should be trained in the correct use of the
product according to the Installation and Maintenance Instructions.
Where a formal 'permit to work' system is in force it must be complied with.
Where there is no such system, it is recommended that a responsible person
should know what work is going on and, where necessary, arrange to have an
assistant whose primary responsibility is safety.
Post 'warning notices' if necessary.
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1.12 Handling
Manual handling of large and/or heavy products may present a risk of injury.
Lifting, pushing, pulling, carrying or supporting a load by bodily force can cause
injury particularly to the back. You are advised to assess the risks taking into
account the task, the individual, the load and the working environment and use
the appropriate handling method depending on the circumstances of the work
being done.
1.13 Residual hazards
In normal use the external surface of the product may be very hot. If used at the
maximum permitted operating conditions the surface temperature of some
products may reach temperatures of 538°C (1000°F).
Many products are not self-draining. Take due care when dismantling or removing
the product from an installation (refer to 'Maintenance instructions').
1.14 Freezing
Provision must be made to protect products which are not self-draining against
frost damage in environments where they may be exposed to temperatures
below freezing point.
1.15 Disposal
Unless otherwise stated in the Installation and Maintenance Instructions, this
product is recyclable and no ecological hazard is anticipated with its disposal
providing due care is taken.
1.16 Returning products
Customers and stockists are reminded that under EC Health, Safety and
Environment Law, when returning products to Spirax Sarco they must provide
information on any hazards and the precautions to be taken due to contamination
residues or mechanical damage which may present a health, safety or
environmental risk. This information must be provided in writing including
Health and Safety data sheets relating to any substances identified as hazardous
or potentially hazardous.
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2. General product information
2.1 General description
The Fig 18HP is an alloy steel butt weld Y-type strainer with flanged screen cover that has
been designed in accordance with ASME B16.34:2004 and ASME VIII. The standard stainless
steel screen in the DN15 to DN50 size range has 0.8 mm perforations – See Section 2.3
'Optional extras' for alternative perforations / mesh sizes and screen materials. If required,
the strainer cover can be drilled and tapped for blowdown and drain valves.
Standards
This product fully complies with the requirements of the European Pressure Equipment
Directive 97 / 23 / EC and carries the
mark when so required.
Certification
This product is available with certification to EN 10204 3.1 and NACE Approval. Note: All
certification / inspection requirements must be stated at the time of order placement.
Note:
For additional data see the following Technical Information Sheets: TI-P162-03.
2.2 Sizes and pipe connections
DN15, DN20, DN25, DN32, DN40 and DN50 (½", ¾", 1", 1¼", 1½" and 2")
Screwed BSP (BS21) and NPT (ASME B 1.20.1)
Socket weld ASME B 16.11 and BS 3799
Butt weld ASME B16.25 Schedule 160, Schedule 80 and Schedule 40
Fig. 1 Fig 18HP, alloy steel, butt weld, Y-type strainer with flanged screen cover
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2.3 Optional extras
The following optional extras are available for all unit sizes at an extra cost and must be
stated at the time of order placement:
0.8 mm (standard), 1 mm, 1.6 mm, 3 mm and 6 mm
Perforations
Contact Spirax Sarco for availability of perforations not displayed.
M20, M40, M60, M100, M200 and M400
Mesh
Contact Spirax Sarco for availability of mesh screens not displayed.
Screen material AISI 316, AISI 316L (standard), AISI 304, AISI 304L and Monel
Blowdown / drain valve connection
The cover can be drilled to the following sizes to enable a blowdown or drain valve to be fitted.
This option is available at extra cost.
Strainer Size
Fig 18HP
DN15 - DN25
DN32 - DN50
Blowdown valve
Drain valve
½"
1¼"
½"
¾"
2.4 Pressure / temperature limits
Steam
saturation
curve
Temperature °F
Temperature °C
Pressure psi g
Pressure bar g
The product must not be used in this region.
Body design conditions PMA Maximum allowable pressure
(431 bar g @ 38°C)
TMA Maximum allowable temperature 538°C @ 154 bar g
Minimum allowable temperature
-29°C
Maximum operating pressure
PMO
*
for saturated steam service
ASME 2500
(6 251 psi g @ 100°F)
(1 000°F @ 2 233 psi g)
(-20°F)
220 bar g @ 374°C
(3 191 psi g @ 705°F)
TMO Maximum operating temperature
538°C @ 154 bar g
Minimum operating temperature
-29°C
Note: For lower operating temperatures consult Spirax Sarco
Designed for a maximum cold hydraulic test pressure of: 646 bar g
(1 000°F @ 2 233 psi g)
(-20°F)
6
(9 369 psi g)
IM-P162-04 ST Issue 1
2.5 Kv values
Size
DN15
DN20
DN25
DN32
DN40
DN50
perforations
5
8
13
22
29
46
0.8, 1.6 and 3 mm
Mesh M200
4
6
10
17
23
37
If required, please consult Spirax Sarco for the Kv values of the following screens: 1 mm,
6 mm, M20, M40, M60, M100 and M400.
2.6 Dimensions
Size
A
B
C
Weight
Volume (L)
8.74
0.130
8.79
0.140
DN25
8.84
0.145
DN32
28.75
0.850
28.82
0.850
28.99
0.850
DN15
DN20
DN40
180
150
280
240
DN50
196
308
Screening area (cm²)
73 cm²
251 cm²
A
B
C Withdrawal
distance
Fig. 2
IM-P162-04 ST Issue 1
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3. Installation
Note: Before actioning any installation observe the 'Safety information' in Section 1.
Referring to the installation and Maintenance Instructions, name-plate and Technical
Information Sheet, check that the product is suitable for the intended installation:
3.1
Check materials, pressure and temperature and their maximum values.If the maximum
operating limit of the product is lower than that of the system in which it is being fitted,
ensure that a safety device is included in the system to prevent overpressurisation.
3.2
Determine the correct installation situation and the direction of fluid flow.
3.3
Remove protection covers from all connections and protective film from all name-plates,
where appropriate, before installation on steam or other high temperature applications.
3.4
Strainers can be fitted on liquid or steam / gas systems in either horizontal pipework or
vertical pipework where the flow is downward. In a horizontal line on steam / gases the
strainer pocket should be in the horizontal plane as this reduces the possibility of
waterhammer. On liquid systems the strainer pocket should point downwards.
3.5
The strainers may be lagged if required.
4. Commissioning
After installation or maintenance ensure that the system is fully functional. Carry out tests on
any alarms or protective devices.
5. Operation
Strainers are passive items and will prevent the onward movement of dirt and debris, which is
larger than the holes in the screen. The pressure drop across the strainer will increase as the
screen becomes blocked. Regular cleaning / blowdown is recommended to keep the screen
clean.
6. Fault finding
Symptom
Possible cause
Blocked screen
No flow through strainer
System is isolated
Increased pressure drop across strainer Screen is blocked up
8
Remedy
Clean or replace screen
See Section 7.2
Check isolation valves
Clean or replace screen
See Section 7.2
IM-P162-04 ST Issue 1
Strainer installed on
steam or gas
Strainer installed on liquid

Fig. 3
Flow
IM-P162-04 ST Issue 1

Flow downwards
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7. Maintenance
Note: Before actioning any maintenance programme observe
the 'Safety information' in Section 1.
Warning
The cover gasket contains a thin stainless steel support ring which may
cause physical injury if not handled and disposed of carefully.
7.1 General information
Before undertaking any maintenance on the strainer, it must be isolated from both the supply
line and return line and any pressure allowed to safely normalise to atmosphere. The trap
should then be allowed to cool. When reassembling, ensure that all joint faces are clean.
7.2
How to clean or replace the strainer screen:
For identification of parts refer to Section 8 'Spare parts'
-
Remove the strainer cap (2) by undoing the cover nuts (6) from the cover studs (5). The
number of bolts / nuts used will depend on the strainer size, material of construction and
design rating.
-
-
-
-
-
Once the cap is removed the strainer screen (4) can be taken out.
Refit the strainer cover (2) using 'Neverseize' compound on the cover studs and nuts
(5 + 6) and tighten. Caution: Ensure that the cover nuts (6) are tightened equally before
final torque is applied - See Table 1 for the recommended tightening torque.
-
Check for leaks.
Clean the strainer screen (4) or replace with a new one.
Reassemble the strainer screen (4) by pushing it into the recess of the cap (2).
Always fit a new strainer cover gasket (3) ensuring the jointing faces are clean.
Table 1 - Recommended tightening torques
Items
Size
5 and 6
10
or
Quantity
mm
N m
(Ibf ft)
DN15 - DN25
4
1¼"
¾" - 10 UNC
140 - 150
(104 - 111)
DN32 - DN50
8
1¼"
¾" - 10 UNC
120 - 130
(89 - 96)
IM-P162-04 ST Issue 1
8. Spare parts
The spare parts available are shown in solid outline. Parts drawn in broken line are not
supplied as spares.
Available spares
Spares kit 1
Spares kit 2
Strainer screen and Cover gasket (state material, perforations or mesh and size of strainer)
Cover gasket (3 off) 4 and 3
3
How to order spares
Always order spares by using the description given in the column headed ‘Available spares’
and state the spares kit required plus the size and type of strainer and perforations or mesh
required for the screen.
Example: 1 off Spares kit 1 for a DN50 Spirax Sarco Fig 18HP strainer having butt weld
connections. The strainer screen is to be stainless steel with 1.6 mm perforations.
3
4
5 (not an available spare)
Fig. 4
6 (not an available spare)
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