The Hydrant Flow Test Calculator measures the rated capacity at 20 psi of a fire hydrant. The rated capacity calculation is useful in determining the total water supply at a given point in the hydrant or water main. The calculation offers more useful information than the test flow by itself and is used by insurance underwriters. For more information see NFPA 291, AWWA M-17, or our web page on Hydrant Flow Testing.
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gpm
psi
x
psi
psi
2,535
1
20
2,519
2
20
2,502
3
20
2,486
4
20
2,469
5
20
2,453
6
20
2,436
7
20
2,419
8
20
2,402
9
20
2,385
10
20
2,368
11
20
2,350
12
20
2,333
13
20
2,315
14
20
2,298
15
20
2,280
16
20
2,262
17
20
2,244
18
20
2,226
19
20
2,207
20
20
20
2,189
21
20
2,170
22
20
2,152
23
20
2,133
24
20
2,114
25
20
2,095
26
20
2,076
27
20
2,056
28
20
2,037
29
20
2,017
30
20
1,997
31
20
1,977
32
20
1,957
33
20
1,936
34
20
1,916
35
20
1,895
36
20
1,874
37
20
1,853
38
20
1,831
39
20
1,810
40
20
1,788
41
20
1,766
42
20
1,744
43
20
1,721
44
20
1,698
45
20
1,675
46
20
1,652
47
20
1,628
48
20
1,604
49
20
1,580
50
20
1,556
51
20
1,531
52
20
1,506
53
20
1,480
54
20
1,454
55
20
1,428
56
20
1,401
57
20
1,374
58
20
1,346
59
20
1,318
60
20
1,289
61
20
1,260
62
20
1,230
63
20
1,199
64
20
1,168
65
20
1,136
66
20
1,103
67
20
1,070
68
20
1,035
69
20
1,000
70
20
963
71
20
926
72
20
886
73
20
846
74
20
803
75
20
759
76
20
712
77
20
663
78
20
610
79
20
553
80
20
490
81
20
419
82
20
337
83
20
232
84
20
0
85
20
81
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