Spirax Sarco Fig B34, Fig B36 Strainers Installation and Maintenance Instructions

1610250 / 1
IM-S60-24
ST Issue 1
Fig B34 and Fig B36
'T' Type or Basket Type Strainers
Installation and Maintenance Instructions
1.Safety information
Basket type
Designed for fitting
into a
horizontal pipeline
2.General
product information
3.Installation
4.Commissioning
5.Operation
'T' type
Designed for fitting
into a
vertical pipeline
6.Fault finding
7.Maintenance
8.Spare parts
IM-S60-24 ST Issue 1
© Copyright 2013
1
Printed in France
2
IM-S60-24 ST Issue 1
1. Safety information
Safe operation of these products can only be guaranteed if they are 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 products listed below comply with the requirements of the
European Pressure Equipment Directive 97 / 23 / EC and carry the
mark when so
required. It should be noted that products rated as 'SEP' are required by the
Directive not to carry the
mark. The products fall within the following
Pressure Equipment Directive categories:
Group 1
Gases
Group 2
Gases
Group 1
Liquids
Group 2
Liquids
DN40 - DN100
2
1
2
SEP
DN125 - DN200
3
2
2
SEP
DN250
3
2
2
1
DN300 - DN350
3
3
2
1
Product
Fig B34
and
Fig B36
i) These products have been specifically designed for use with liquids or gases
which are in Groups 1 and 2 of the above mentioned 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.
1.2Access
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.
1.3Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.
IM-S60-24 ST Issue 1
3
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.
1.8Temperature
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.
4
IM-S60-24 ST Issue 1
1.12Handling
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').
1.14Freezing
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.
1.15Disposal
Unless otherwise stated in the Installation and Maintenance Instructions, these
products are recyclable and no ecological hazard is anticipated with 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.
IM-S60-24 ST Issue 1
5
2. General product information
2.1 General description
The Fig B34 / Fig B36 basket type strainers have been designed for fitting into horizontal
pipelines and have a drain plug fitted at the bottom of the body to drain the unit. The
Fig B34 / Fig B36 'T' type strainers have been designed for fitting into vertical pipelines
and can have an optional drain plug fitted on the side of the body to drain the unit. These
strainers are supplied as integrally flanged units and have a stainless steel strainer screen
with 3 mm perforations as standard and the cover has a tapping for fitting a handling eyebolt:
- DN125 to DN150 " UNC-2B tapping.
- DN200 to DN350 " UNC-2B tapping.
Optional strainer screens - Available on request for all sizes:
- Stainless steel strainer screen having 0.8 mm perforations.
- Stainless steel strainer screen having 1.6 mm perforations.
- Stainless steel strainer screen having Mesh 40.
- Stainless steel strainer screen having Mesh 100.
Option
The body has two bosses that can be drilled and tapped to accommodate pressure gauges
Standards
These products fully complies with the requirements of the European Pressure Equipment
Directive 97 / 23 / EC and carries the
mark when so required.
Certification
These products are 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.
Optional extras - Available at extra cost
Pressure gauge connections - Bosses are provided on the body upstream and downstream
of the screen which can be drilled and tapped to accommodate pressure gauges.
The cover can be drilled and tapped for an air vent - If you want to use the strainer on a
vertical pipeline ('T' position) the body should be drained of condensate via a drain plug
that is situated at the side of the body.
2.2 Sizes and pipe connections
DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300 and DN350.
Flanged:
- EN 1092 PN16, PN25 and PN40.
- JIS / KS 10K and JIS / KS 20K.
- ASME B 16.5 Class 150 and Class 300.
Face-to-face dimensions are in accordance with:
- EN 558 Series 1 for the PN and JIS / KS.
- ASME B16.10 Class 150 for the ASME Class 150 rated design.
- ASME B16.10 Class 300 for the ASME Class 300 rated design.
2.3 Kv values
For conversion:
C v (UK) = Kv x 0.963
C v (US) = Kv x 1.156
Size DN40DN50DN65DN80DN100
Kv
25
43
84
156
353
6
IM-S60-24 ST Issue 1
2.4Materials
No.Part
1Body
Material
2Cover
Carbon steel Fig B34
EN 10213 1.0619+N and ASTM A216 WCB
Stainless steel Fig B36
EN 10213 1.4308 and ASTM A 351-CF8
Carbon steel
Fig B34
EN 10213 1.0619+N and ASTM A216 WCB
Stainless steel Fig B36
EN 10213 1.4308 and ASTM A 351-CF8
3 Screen
Stainless steel
4 Gasket
Reinforced exfoliated graphite
5 Studs Carbon steel
6 Nuts Carbon steel
Fig B34
ASTM A193 Gr. B7
Fig B36
ASTM A193 Gr. B8M2
Fig B34
ASTM A194 Gr. 2H
Fig B36
ASTM A194 Gr. 8M
2
4
5
6
3
Fig. 1 Fig B34 and Fig B36
1
DN125
DN150
DN200DN250
DN300
DN350
488
748
1 869
3 686
5 244
8 100
IM-S60-24 ST Issue 1
7
2.5Typical product name-plate - Fig B34
40 bar g
400°C
8
IM-S60-24 ST Issue 1
2.6 Pressure / temperature limits - Fig B34
PN16
PN25
PN40
A
Pressure psi g
B
C
D
Steam
saturation
curve
B
C
Pressure bar g
D
Temperature °F
Flanged:
Temperature °C
The product must not be used in this region
or beyond the parameter of the PMA or TMA of the relative end connection.
Body design condition
PMA Maximum allowable pressure
TMA Maximum allowable temperature
A-B-B
PN16
Minimum allowable temperature
Maximum operating pressure
PMO
for saturated steam service
TMO Maximum operating temperature
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
PN16
16 bar g @ 50°C (232 psi g @ 122°F)
400°C @ 9.5 bar g (752°F @ 138 psi g)
-29°C
13.4 bar g @ 193°C (194 psi g @ 379°F)
400°C @ 9.5 bar g (752°F @ 138 psi g)
-29°C
(-20°F)
24 bar g
(348 psi g)
Body design condition
PMA Maximum allowable pressure
(-20°F)
PN25
25 bar g @ 50°C (362 psi g @ 122°F)
TMA Maximum allowable temperature 400°C @ 14.8 bar g (752°F @ 215 psi g)
A-C-C
PN25
Minimum allowable temperature
Maximum operating pressure
PMO
for saturated steam service
-29°C
(-20°F)
20.2 bar g @ 217°C (293 psi g @ 422°F)
TMO Maximum operating temperature 400°C @ 14.8 bar g (752°F @ 215 psi g)
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
-29°C
(-20°F)
37.5 bar g
(543 psi g)
Body design condition
PMA Maximum allowable pressure
PN40
40 bar g @ 50°C (580 psi g @ 122°F)
TMA Maximum allowable temperature 400°C @ 23.8 bar g (752°F @ 345 psi g)
A-D-D
PN40
Minimum allowable temperature
Maximum operating pressure
PMO
for saturated steam service
-29°C
(-20°F)
31.2 bar g @ 236°C (452 psi g @ 457°F)
TMO Maximum operating temperature 400°C @ 23.8 bar g (752°F @ 345 psi g)
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
IM-S60-24 ST Issue 1
-29°C
(-20°F)
60 bar g
(870 psi g)
9
2.6 Pressure / temperature limits - Fig B34 (continued)
Pressure psi g
0
ASME
Class 300
Temperature °C
ASME
Class 150
200
300
400
500
600
C
300
200
Steam
saturation
curve
100
0
-29
B
0
10
20
30
40
741
797
700
600
500
400
300
200
100
C
-20
51.1
Temperature °F
Flanged:
425
400 A B
100
Pressure bar g
The product must not be used in this region
or beyond the parameter of the PMA or TMA of the relative end connection.
Body design condition
PMA Maximum allowable pressure
19.6 bar g @ 38°C (284 psi g @ 100°F)
TMA Maximum allowable temperature
425°C @ 5.5 bar g
(797°F @ 80 psi g)
-29°C
(-20°F)
A - B - B Minimum allowable temperature
ASME
150
ASME Class 150
PMO
Maximum operating pressure
for saturated steam service
TMO Maximum operating temperature
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
13.9 bar g @ 197°C (201 psi g @ 386°F)
425°C @ 5.5 bar g
(797°F @ 80 psi g)
-29°C
(-20°F)
29.4 bar g
(426 psi g)
Body design condition
PMA Maximum allowable pressure
ASME Class 300
51.1 bar g @ 38°C (741 psi g @ 100°F)
TMA Maximum allowable temperature 425°C @ 28.8 bar g (797°F @ 418 psi g)
A - C - C Minimum allowable temperature
ASME
300
Maximum operating pressure
PMO
for saturated steam service
(-20°F)
42 bar g @ 255°C (609 psi g @ 491°F)
TMO Maximum operating temperature 425°C @ 28.8 bar g (797°F @ 418 psi g)
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
10
-29°C
-29°C
(-20°F)
77 bar g
(1 116 psi g)
IM-S60-24 ST Issue 1
2.6 Pressure / temperature limits - Fig B34 (continued)
JIS / KS 10K
JIS / KS 20K
0
425
400 A
300
200
200
100
300
C
493
C
Steam
saturation
curve
100
0
-29
400
B
C
0
5
10
15
20
25
30
752
700
600
500
400
300
200
100
B
-20
34
Temperature °F
Flanged:
Temperature °C
Pressure psi g
Pressure bar g
The product must not be used in this region
or beyond the parameter of the PMA or TMA of the relative end connection.
Body design condition
JIS / KS 20K
PMA Maximum allowable pressure
34 bar g @ 120°C (493 psi g @ 248°F)
Maximum
allowable temperature
425°C @ 20 bar g (797°F @ 290 psi g)
TMA
A-B-B
Minimum allowable temperature
JIS 20K
KS 20K
PMO
Maximum operating pressure
30.7 bar g @ 232°C (445 psi g @ 449°F)
for saturated steam service
TMO
Maximum operating
temperature
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
-29°C
425°C @ 20 bar g (797°F @ 290 psi g)
-29°C
(-20°F)
51 bar g
(739 psi g)
Body design condition
PMA Maximum allowable pressure
TMA
Maximum allowable
temperature
(-20°F)
JIS / KS 10K
14 bar g @ 120°C (203 psi g @ 248°F)
300°C @ 10 bar g (572°F @ 145 psi g)
A-C-C
Minimum allowable temperature
JIS 10K
KS 10K
PMO
Maximum operating pressure
12.6 bar g @ 193°C (183 psi g @ 379°F)
for saturated steam service
TMO
Maximum operating
temperature
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
IM-S60-24 ST Issue 1
-29°C
(-20°F)
300°C @ 10 bar g (572°F @ 145 psi g)
-29°C
(-20°F)
21 bar g
(304 psi g)
11
2.7Typical product name-plate - Fig B36
B36
40 bar g
400°C
12
IM-S60-24 ST Issue 1
2.8 Pressure / temperature limits - Fig B36
Pressure psi g
PN16
PN25
PN40
A
B
C
D
Steam
saturation
curve
B
C
D
Temperature °F
Flanged:
Temperature °C
Pressure bar g
The product must not be used in this region
or beyond the parameter of the PMA or TMA of the relative end connection.
Body design condition
PMA Maximum allowable pressure
TMA Maximum allowable temperature
A-B-B
PN16
Minimum allowable temperature
Maximum operating pressure
PMO
for saturated steam service
TMO Maximum operating temperature
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
PN16
16 bar g @ 50°C (232 psi g @ 122°F)
400°C @ 9.5 bar g (752°F @ 138 psi g)
-29°C
12.1 bar g @ 192°C (175 psi g @ 377°F)
400°C @ 9.5 bar g (752°F @ 138 psi g)
-29°C
(-20°F)
24 bar g
(348 psi g)
Body design condition
PMA Maximum allowable pressure
(-20°F)
PN25
25 bar g @ 50°C (362 psi g @ 122°F)
TMA Maximum allowable temperature 400°C @ 15.1 bar g (752°F @ 219 psi g)
A-C-C
PN25
Minimum allowable temperature
Maximum operating pressure
PMO
for saturated steam service
-29°C
(-20°F)
18.4 bar g @ 209°C (267 psi g @ 408°F)
TMO Maximum operating temperature 400°C @ 15.1 bar g (752°F @ 219 psi g)
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
-29°C
(-20°F)
37.5 bar g
(543 psi g)
Body design condition
PMA Maximum allowable pressure
PN40
40 bar g @ 50°C (580 psi g @ 122°F)
TMA Maximum allowable temperature 400°C @ 24.1 bar g (752°F @ 349 psi g)
A-D-D
PN40
Minimum allowable temperature
Maximum operating pressure
PMO
for saturated steam service
-29°C
(-20°F)
28.7 bar g @ 232°C (416 psi g @ 449°F)
TMO Maximum operating temperature 400°C @ 24.1 bar g (752°F @ 349 psi g)
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
IM-S60-24 ST Issue 1
-29°C
(-20°F)
60 bar g
(870 psi g)
13
2.8 Pressure / temperature limits - Fig B36 (continued)
ASME
Class 150
ASME
Class 300
C B
Steam
saturation
curve
C
Temperature °F
Flanged:
Temperature °C
Pressure psi g
A
B
Pressure bar g
The product must not be used in this region
or beyond the parameter of the PMA or TMA of the relative end connection.
Body design condition
PMA Maximum allowable pressure
TMA
Maximum
allowable temperature
A - B - B Minimum allowable temperature
ASME
150
PMO
Maximum operating pressure
for saturated steam service
TMO
Maximum
operating temperature
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
ASME Class 150
19 bar g @ 38°C
(284 psi g @ 100°F)
538°C @ 1.4 bar g
(1 000°F @ 20 psi g)
-29°C
(-20°F)
13.3 bar g @ 195°C
(193 psi g @ 383°F)
538°C @ 1.4 bar g
(1 000°F @ 20 psi g)
-29°C
(-20°F)
28.5 bar g
(413 psi g)
Body design condition
PMA Maximum allowable pressure
TMA
Maximum
allowable temperature
A - C - C Minimum allowable temperature
ASME
300
PMO
Maximum operating pressure
for saturated steam service
TMO
Maximum
operating temperature
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
14
ASME Class 300
49.6 bar g @ 38°C
(719 psi g @ 100°F)
538°C @ 24.4 bar g (1 000°F @ 354 psi g)
-29°C
(-20°F)
33 bar g @ 241°C
(478 psi g @ 466°F)
538°C @ 24.4 bar g (1 000°F @ 354 psi g)
-29°C
(-20°F)
74.4 bar g
(1 080.5 psi g)
IM-S60-24 ST Issue 1
2.8 Pressure / temperature limits - Fig B36 (continued)
JIS / KS 10K
JIS / KS 20K
0
425
400 A
300
200
100
C
200
400
B
C
Steam
saturation
curve
100
0
-29
300
C
0
10
20
30
493
797
700
600
500
400
300
200
100
B
-20
34
Temperature °F
Flanged:
Temperature °C
Pressure psi g
Pressure bar g
The product must not be used in this region
or beyond the parameter of the PMA or TMA of the relative end connection.
Body design condition
JIS / KS 20K
PMA Maximum allowable pressure
34 bar g @ 120°C (493 psi g @ 248°F)
Maximum
allowable temperature
425°C @ 20 bar g (797°F @ 290 psi g)
TMA
A-B-B
Minimum allowable temperature
JIS 20K
KS 20K
PMO
Maximum operating pressure
30.5 bar g @ 240°C (442 psi g @ 464°F)
for saturated steam service
TMO
Maximum
operating temperature
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
-29°C
(-20°F)
425°C @ 20 bar g (797°F @ 290 psi g)
-29°C
(-20°F)
51 bar g
(739 psi g)
Body design condition
JIS / KS 10K
PMA Maximum allowable pressure
14 bar g @ 120°C (203 psi g @ 248°F)
Maximum
allowable temperature
300°C @ 10 bar g (572°F @ 145 psi g)
TMA
A-C-C
Minimum allowable temperature
JIS 10K
KS 10K
PMO
Maximum operating pressure
12.5 bar g @ 193°C (183 psi g @ 383°F)
for saturated steam service
TMO
Maximum
operating temperature
Minimum operating temperature
Designed for a maximum
cold hydraulic test pressure of:
IM-S60-24 ST Issue 1
-29°C
(-20°F)
300°C @ 10 bar g (572°F @ 145 psi g)
-29°C
(-20°F)
21 bar g
(304 psi g)
15
2.9Dimensions / Weights (approximate in mm and kg)
Body
rating
Size
Dimensions
A
PN
JIS
KS
PN40
PN25
PN16
B
Weights
C
D
ASME
150
300
PN
JIS
KS
ASME
DN40
200
165
229
121.5
71.5
150
14.0
15.0
DN50
230
203
267
131.5
79.0
170
16.0
16.5
DN65
290
216
292
152.0
97.5
190
19.0
20.0
DN80
310
241
318
161.0
114.5
210
30.0
33.0
JIS / KS 20 DN100
350
292
350
181.0
125.5
250
35.5
42.5
JIS / KS 10 DN125
DN150
400
330
400
218.5
148.0
290
67.0
74.5
480
356
444
238.5
174.5
330
76.0
86.5
DN200
600
495
559
290.5
206.0
400
166.0
175.0
ASME 150
and
DN250
ASME 300 DN300
730
622
622
325.5
244.0
480
205.0
210.5
850
698
711
368.5
307.5
550
341.5
369.5
DN350
980
787
838
383.5
332.0
600
459.5
426.5
Side view
DN100 shown
D Withdrawal distance
A
Top view
DN100 shown
C
Optional
Pressure gauge tappings
B
Optional
Air vent tapping
Standard
Bottom drain tapping
Optional
Lateral 'T' type drain tapping
16
IM-S60-24 ST Issue 1
Body
rating
Size
Tappings
Standard
Bottom drain
PN40
PN25
PN16
Optional
Lateral 'T'
type drain
Pressure
gauge
Air vent on
the cover
DN40
½"
"
¼"
¼"
DN50
½"
"
¼"
¼"
DN65
¾"
½"
¼"
¼"
DN80
¾"
½"
¼"
¼"
JIS / KS 20 DN100
¾"
½"
¼"
¼"
JIS / KS 10 DN125
DN150
1½"
¾"
¼"
¼"
1½"
¾"
¼"
¼"
DN200
1½"
¾"
¼"
¼"
DN250
1½"
¾"
¼"
½"
2"
1"
¼"
½"
2"
1"
¼"
½"
ASME 150
and
ASME 300 DN300
DN350
Size
Screening
area (cm2)
3.0
Opening %
1.6
0.8
M100
M40
3.0
Opening / Inlet ratio
1.6
0.8
M100
M40
DN40
139
3.54
3.32
2.88
2.53
DN50
216
3.52
3.30
2.86
2.51
DN65
343
3.31
3.10
2.69
2.36
DN80
590
3.76
3.52
3.05
2.68
3.73
3.50
3.03
2.66
3.11
2.91
2.52
2.22
DN100
916
DN125
1 191
DN150
1 692
3.06
2.87
2.49
2.19
DN200
3 486
3.55
3.33
2.89
2.54
DN250
5 223
3.40
3.19
2.77
2.43
DN300
7 379
3.34
3.13
2.71
2.39
DN350
9 597
3.19
2.99
2.59
2.28
IM-S60-24 ST Issue 1
32%
30%
26%
23%
17
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. Use basket type strainers for horizontal applications and
'T' Type strainers for vertical applications where the flow is downward.
3.5
Suitable isolation valves must be installed to allow for safe maintenance and strainer
replacement.
3.6
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
18
Remedy
Clean or replace screen
See Section 7.2
Check isolation valves
Clean or replace screen
See Section 7.2
IM-S60-24 ST Issue 1
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
Maintenance can be completed with the strainer in the pipeline. It is recommended that a new
gasket is used whenever maintenance is undertaken. 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 strainer 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 cover (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 cover has been removed the strainer screen (3) can be taken out.
Clean the strainer screen (3) or replace with a new one.
Reassemble the strainer screen (3) by pushing it into the recess of the body (1).
Always fit a new strainer cover gasket (4) ensuring the jointing faces are clean.
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.
Table 1 - Recommended tightening torques
Size
DN40
(1½")
DN50
(2")
DN65
(2½")
Quantity
Dimensions
4
½" - 13 UNC
4
Nm
Torque
lbf ft
15
11.0
22
16.2
" - 11 UNC
40
29.5
70
51.6
¾" - 10 UNC
100
73.7
DN80
(3")
DN100
(4")
DN125
(5")
6
100
73.7
DN150
(6")
6
160
118.0
DN200
(8")
8
205
151.2
DN250
(10")
12
205
151.2
DN300
(12")
12
DN350
(14")
14
IM-S60-24 ST Issue 1
4
" - 11 UNC
1 " - 7 UNC
375
276.5
420
309.7
19
8. Spare parts
The spare parts available are shown
in solid outline. Parts shown in broken
line are not supplied as spares.
6
Available spares
Strainer screen
4
(state material, size of perforations
and size of strainer)
Cover gasket (packet of 3)
3
Set of cover studs and nuts
5, 6
2
(not an available
spare)
3
How to order spares
Always order spares by using the
description given in the column headed
'Available spares' and state the size
and type of strainer and perforations
required for the screen.
Example: 1 - Stainless steel screen
having 3 mm perforations for a DN250
Spirax Sarco Fig B36 strainer.
Note: When ordering a spare screen
it is advisable to order a cover gasket
(packet of 3).
4
5
1
(not an available spare)
Fig. 2
20
IM-S60-24 ST Issue 1
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