18
Minimum Pressure Tank and Supply Pipe Sizing
A VFD system needs only a small pressure tank to maintain constant pressure, although a larger tank
may be used.
•
If adding a drive to a system with an existing large tank, refer to
“Tank Size and Bump Mode Adjust-
ments (FE Connect App Only)” on page 35
•
The pressure tank pre-charge setting should be 70% of the targeted system pressure.
Refer to the following recommendations for best performance.
Submersible Pump Applications
Pump Flow Rating
VFD Model
Minimum Tank Size
Less than 12 gpm (45.4 lpm)
SubDrive 15
2 gallons (7.6 liters)
SubDrive 20
4 gallons (15.1 liters)
SubDrive 30
4 gallons (15.1 liters)
SubDrive 50
8 gallons (30.3 liters)
12 gpm (45.4 lpm) and higher
SubDrive 15
4 gallons (15.1 liters)
SubDrive 20
8 gallons (30.3 liters)
SubDrive 30
8 gallons (30.3 liters)
SubDrive 50
20 gallons (75.7 liters)
Surface Pump Applications
Maximum Pump Flow
Minimum Tank Size
10 GPM
2 gallons (7.6 liters)
20 GPM
4 gallons (15.1 liters)
30 GPM
4 gallons (15.1 liters)
40 GPM
8 gallons (30.3 liters)
Minimum Supply Pipes
The minimum supply pipe diameter past the pressure sensor (transducer) should be selected not to ex-
ceed a maximum velocity of 8 feet per second (2.4 m/s) based on the flow rate of the system.
IMPORTANT:
Water system piping should be performed by an experienced professional to ensure ad-
equate flow.
Maximum GPM (lpm)
Minimum Pipe Diameter
11.0 (41.6)
0.75 in.
19.6 (74.2)
1 in.
30.6 (115.8)
1.25 in.
44.1 (166.9)
1.5 in.
78.3 (296.4)
2 in.
122.4 (463)
2.5 in.
176.3 (667)
3 in.
240.0 (908)
3.5 in.
313.3 (1186)
4 in.
396.6 (1501)
4.5 in.
489.6 (1853)
5 in.
INSTALLATION PLANNING
Minimum Pressure Tank and Supply Pipe Sizing
Summary of Contents for SubDrive 15
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