BBA Pumps BA Series - Page 40

BA series pumps
1401 Pump unit installation
5.12
– The fittings that are used also have resistance. The table below shows the resistance of the fittings
converted to the equivalent length of straight pipe (smooth steel pipe).
Internal
pipe diameter
Resistance in:
Bends Tee Shut-offs
Non-return
valve
90° 45° Gate Globe
mm mmmmmm
20
25
30
40
50
70
100
120
150
200
250
300
0.6
0.7
0.8
1.0
1.2
2.0
2.5
3.0
3.7
5.0
6.2
7.5
0.3
0.4
0.45
0.6
0.75
1.0
1.5
1.8
2.25
3.0
3.75
4.5
1.5
1.8
2.1
2.7
3.4
4.7
6.7
8.0
10.0
13.5
16.5
20.0
0.15
0.2
0.25
0.3
0.35
0.5
0.7
0.85
1.1
1.4
1.75
2.1
7.5
8.7
10.0
13.5
17.0
24.0
34.0
41.0
51.0
68.0
85.0
99.5
2.0
2.2
2.7
3.4
4.3
6.0
8.5
10.0
12.7
17.0
21.2
25.5
Internal
pipe diameter
Resistance in:
Bends Tee Shut-offs
Non-return
valve
90° 45° Gate Globe
inch ft ft ft ft ft ft
0.787
0.984
1.18
1.57
1.97
2.75
3.94
4.72
5.90
7.87
9.84
11.8
1.97
2.30
2.62
3.28
3.94
6.56
8.20
9.84
12.1
16.4
20.3
24.6
0.98
1.31
1.48
1.97
2.46
3.28
4.92
5.91
7.38
9.84
12.3
14.8
4.92
5.91
6.89
8.86
11.2
15.4
22.0
26.2
32.8
44.3
54.1
65.6
0.49
0.66
0.82
0.98
1.15
1.64
2.30
2.79
3.61
4.59
5.74
6.89
24.6
28.5
32.8
44.3
55.8
78.7
112
135
167
223
279
326
6.6
7.2
8.9
11.2
14.1
19.7
27.9
32.8
41.7
55.8
69.6
83.7