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Water Pressure Drop Tables
2 HP
Flow
∆ P
gpm
lpm
psig
kPa
4.06
15.4
3.5
24.1
6.01
22.8
7.0
48.3
8.02
30.4
11.5
79.3
10.00
18.0
37.9
124.1
10 HP
Flow
∆ P
gpm
lpm
psig
kPa
22.0
83.3
4.7
32.6
30.0
113.6
8.28
57.1
38.0
143.8
12.91
89.0
46.0
174.1
16.77 115.6
50.0
189.3
20.00 137.9
30 HP
Flow
∆ P
gpm
lpm
psig
kPa
72.0
272.5
6.0
41.1
75.0
283.9
6.5
44.8
80.0
302.8
8.0
55.2
85.0
321.7
9.5
65.5
Calculating Chiller Nominal Flow and Pressure to Process
• Flow rate: Obtain the flow reading from the appropriate pump curve.
• Pressure: Obtain a corresponding pressure reading from the pump curve you selected,
then subtract the one-pump pressure drop listed in the above table using the
appropriate chiller hp and flow rate.
• For two-pump (Process/Recirc) chillers, do not subtract pressure drop from table above
for process pump.
2-40 HP Portable Chillers
Note:
A recirculation pump is required for flows greater than the
maximum or less than the minimum indicated.
Note:
Process flow less than or greater than the flow rates shown below
requires a recirculation pump.
Pressure drops in ∆P, psig and kPa
3.5 HP
Flow
∆ P
gpm
lpm
psig
8.03
30.4
4.0
27.6
10.00
37.9
6.5
44.8
12.00
45.4
10.0
69.
14.00
13.0
53.0
89.6
16.00
60.6
18.0
124.1
15 HP
Flow
∆ P
gpm
lpm
psig
30.0
113.6
4.5
31.3
40.0
151.4
7.5
51.7
50.0
189.3
12.4
85.2
60.0
227.1
17.8
122.8
70.0
264.9
24.2
166.6
Flow
∆ P
gpm
lpm
psig
38.7
146.5
1.5
10.4
51.2
193.8
2.6
17.9
62.3
235.8
3.8
26.2
71.8
271.7
4.9
33.8
82.9
313.7
6.5
44.8
Note:
These pressure drop values are valid for single- and no-pump
portable chillers.
Chapter 7: Appendix
5 HP
Flow
∆ P
kPa
gpm
lpm
psig
10.0
37.9
1.5
12.0
45.4
2.2
18.0
68.1
4.7
24.0
7.3
90.8
20 HP
Flow
∆ P
kPa
gpm
lpm
psig
40.0
151.4
4.0
45.0
170.3
4.0
50.0
189.3
5.0
52.0
196.8
6.0
55.0
208.2
6.5
35 HP
Flow
∆ P
kPa
gpm
lpm
psig
92.6
350.5
7.9
107.1
405.4
10.4
7.5 HP
Flow
∆ P
kPa
gpm
lpm
psig
10.5
12.0
45.4
2.3
14.8
16.0
60.6
2.9
32.1
20.0
75.7
5.0
24.0
6.9
50.2
90.8
28.0
106.0
9.6
33.0
124.9
12.7
25 HP
Flow
∆ P
kPa
gpm
lpm
psig
27.6
55.0
208.2
5.5
27.6
58.0
219.5
5.8
34.5
61.0
230.9
6.0
41.4
70.0
264.9
8.5
44.8
40 HP
Flow
∆ P
kPa
gpm
lpm
psig
54.5
44.7
169.2
2.0
71.7
58.5
221.4
3.4
70.9
268.3
4.9
81.6
308.8
6.3
105.7
400.0
10.3
60 of 78
kPa
16.1
20.1
34.5
47.4
65.9
87.8
kPa
37.9
40.0
41.4
58.6
kPa
13.8
23.4
33.8
43.5
71.0
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