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Figure 5.3 Gas Flow in Pipes
Total Gas Input
m³/hr
NB
4.73
5.92
7.10
8.27
9.44
11.19
12.36
14.1
18.88
22.38
24.72
28.20
33.57
37.08
42.30
44.76
49.44
56.40
61.80
70.50
74.16
84.60
The above table expresses pipe lengths from gas meter to appliance which will produce approx. 1mbar pressure
loss. This table must be used in conjunction with losses of various fittings fitted in the gas line shown below.
Fitting Type(NB)
Per elbow
Per Tee
Per 90°Bend
For example: - 2 Purewell 120kW Boilers being fed by 65mm NB pipe with 6 elbows between gas meter and
boiler header can have a maximum length of 72m - (6 x 2m) = 60 metres run to achieve a 1mbar loss.
Note! Information above is based on IM/16.
HAMWORTHY HEATING LTD
20mm
25mm
10
42
-
25
-
16
-
11
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
20mm
25mm
0.5m
0.5m
0.5m
0.5m
0.3m
0.3m
Maximum length of gas pipe (Metres)
40mm
50mm
-
-
180
820
120
540
85
380
62
280
42
185
33
145
25
110
12
56
-
38
-
30
-
22
-
15
-
11
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
40mm
50mm
1.0m
1.5m
1.0m
1.5m
0.3m
0.5m
8
WARMWELL
65mm
80mm
-
-
-
-
-
-
-
-
900
-
580
-
470
-
345
-
180
-
120
750
96
600
72
440
47
290
37
235
27
170
24
150
19
115
14
86
11
71
-
51
-
46
-
34
65mm
80mm
2.0m
2.5m
2.0m
2.5m
0.5m
1.0m
100mm
-
-
-
-
-
-
-
-
-
-
-
-
-
-
810
730
570
430
340
245
220
165
100mm
3.5m
3.5m
1.5m
500001091/F
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