Baseline Systems BHM Series Hydrometer - Manual (Page 6)

6
• Hydrometers Operation and Maintenance Manual
Specifications, Cont.
6”
8”
5.0
4.0
3.0
2.0
1.0
0 50 100 150 200 250
1 ½”
2”
3”
Headloss Charts
Headloss
(psi)
Headloss
(psi)
5.0
4.0
3.0
2.0
1.0
0 200 400 600 800 1000 1200 1400
4”
Flow Rate (gpm) Flow Rate (gpm)
Lowest Flow
within ± 5% Accuracy
1 ½”
2”
3”
4”
6”
8”
1.8 GPM 4.4 GPM 44 GPM 55 GPM
5.3 GPM 20 GPM 66 GPM 95 GPM
14 GPM 53 GPM 176 GPM 220 GPM
21 GPM 79 GPM 264 GPM 380 GPM
53 GPM 198 GPM 660 GPM 860 GPM
97 GPM 357 GPM 1,189 GPM 1,500 GPM
Lowest Flow
within ± 2% Accuracy
Size
Nominal Flow
within ± 2% Accuracy
Maximum Flow
within ± 2% Accuracy
Performance Data
Cv (Flow Rate at
1.0 psi of Headloss)
1 ½”
2”
3”
4”
6”
8”
23 GPM
35 GPM
92 GPM
139 GPM
347 GPM
624 GPM Size
Cv Values
Pressure loss in psi = (gpm/Cv) ^2
Example: 2” Hydrometer, design flow @ 97 gpm
(55 gpm/35 gpm) ^2 = 2.5 psi headloss