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Commercial Water
Maximum Inlet Pressure
a closed valve must always be lower than the maximum permissible operating pressure.
Motor Data – Starts per Hour / Minimum Run Time
HP
0.5
0.75
1
1.5
2
3
5
7.5
10
15
20
25
30
40
50
60
75
NOTE(S)
allowable tolerance for heat rise and insulation breakdown.
p
PN - pmax
1max
Having the following meaning of the symbols:
p
= Maximum pressure delivered by the pump
max
p
= Maximum inlet pressure
1max
PN = Maximum operating pressure
Maximum Starts per Hour*
24
24
15
13
12
9
8
7
6
5
5
5
4
4
3
3
3
L enntech
Goulds Pumps
Minimum run time between starts (seconds)
120
120
75
76
77
30
83
88
92
100
110
115
120
130
145
170
180
PAGE 21
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