Pipeline ancillaries
Strainers and filters
Kv values
Size
Perforations 0.8, 1.6 and 3 mm
Mesh 40 and 100
Mesh 200
For conversion:
Cv (UK) = Kv x 0.963
Cv (US) = Kv x 1.156
1⁄2"
3⁄4"
1"
11⁄4"
11⁄2"
2"
21⁄2"
3"
3.6
3.6
3.6
11
11
9
15.5
15.5
13.0
26
41
68
82
115
26
41
68
82
115
21
35
55
66
93
Spare parts
The spare parts available are shown in solid outline. Parts drawn
in broken line are not supplied as spares.
Available spares
Strainer screen
4
(state material, size of perforations or mesh and size of strainer)
Cap gasket (packet of 3)
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 perforation or mesh required.
Example: 1 - Strainer screen, stainless steel having 0.8 mm
perforations for a 11⁄2" Spirax Sarco Fig 12 strainer.
Dimensions / weights (approximate) in mm and kg
Size
A
B
C
Screening
D
area cm2 Weight
32
25
0.47
36
42
0.77
48
71
1.40
60
135
2.15
65
161
3.30
1⁄2"
87
3⁄4"
110
55
79
65
93
78
110
140
153
177
230
237
C
1"
11⁄4"
11⁄2"
2"
21⁄2"
3"
B
125
155
103
190
115
230
140
274
177
280
183
5.10
94
406
7.30
105
406
7.50
Withdrawal
distance
A
76
251
D
Safety information, installation and maintenance
For full details see the Installation and Maintenance Instructions
(IM-S60-17) supplied with the product.
Warning:
The strainer cap gasket contains a thin stainless steel support ring,
which may cause physical injury if it is not handled and disposed of
carefully.
Installation note:
The strainer should be installed in the direction of flow, as indicated
on the body. On applications involving steam or gases the pocket
should be in the horizontal plane. On liquid systems the pocket should
point downwards. Suitable isolation valves must be installed to allow
for safe maintenance and trap replacement.
Maintenance note:
Maintenance can be completed with the strainer in the pipeline.
Size 1⁄2" to 2"
3
4
2
Disposal:
The product is recyclable. No ecological hazard is anticipated with
disposal of this product providing due care is taken.
How to order
Example: 1 off Spirax Sarco 2" Fig 12 SG iron strainer, screwed BSP,
with stainless steel screen having 0.8 mm perforations.
Size 21⁄2" and 3"
3
4
6
5
Recommended tightening torques
Item
2
5
Qty
Size
1
1⁄2"
or
mm
N m
1
3⁄4"
1
1"
1
11⁄4"
1
11⁄2"
1
2"
36
38
50
46
50
60
M28
M32
M42
M56
M60
M72
38 - 40
42 - 48
70 - 80
124 - 144
164 - 184
234 - 264
50 - 55
50 - 55
4
4
21⁄2"
3"
19
M12
19
M12
TI-P163-01 ST Issue 8
Fig 12 SG Iron Strainer
7.7.10
