Tank And Pipe Sizing - Franklin Electric SubDrive15 Manuel Du Propriétaire

Tank and Pipe Sizing

The SubDrive/MonoDrive needs only a small pressure tank to maintain constant pressure.
(See table below for recommended tank size.) For pumps rated 12 gpm (45.4 lpm) or more,
a slightly larger tank is recommended for optimum pressure regulation. The SubDrive/
MonoDrive can also use an existing tank with a much larger capacity.
Table 3: Minimum Pressure Tank Size (Total Capacity)
Pump Flow Rating
Less than 12 gpm (45.4 lpm)
12 gpm (45.4 lpm) and higher
The pressure tank pre-charge setting should be 70% of the system pressure setting
as indicated in Table 4. The minimum supply pipe diameter should be selected
not to exceed a maximum velocity of 8 ft/sec (2.4 m/s) (See Table 5 below for minimum
pipe diameter).
The pressure tank pre-charge setting should be 70%
of system pressure setting.
6 ft (1.83 m) max
Pressure
(Discharge into drain
WARNING
rated for max pump
output at relief pressure.)
Submersible pumps can
develop very high pressure
Pump
in some situations. Always
install a pressure relief
valve able to pass full pump
flow at 100 PSI. Install the
pressure relief valve near
the pressure tank and run
to a drain capable of full
system flow.
Motor
Position the pressure sensor
between vertical (preferred)
and horizontal. Do not install
inverted. Not to be placed in
direct sunlight.
SubDrive15 or MonoDrive
SubDrive20
SubDrive30 or MonoDriveXT
SubDrive50
SubDrive15 or MonoDrive
SubDrive20
SubDrive30 or MonoDriveXT
SubDrive50
Analog pressure transducer
must be installed in the upright
and vertical position.
Pressure
Transducer
Gauge
Pressure
Drain Valve
Relief Valve
Turn right (clockwise)
7/32" Allen-wrench
to increase pressure setting.
Turn left (counter clockwise)
Pressure sensor
to decrease pressure setting.
(NSF61 rated) factory
preset for 50 psi
1/4 turn = 3 psi
PRESSURE SENSOR
SubDrive/MonoDrive Connect
Controller Model
Table 4
Pressure Setting Guide
Pressure Sensor
Set Point (PSI)
5
10
15
20
25
30
35
40
45
50 (Factory set)
55
60
65
70
75
80
85
"
(provided)
90
95
WARNING
The pressure sensor
supplied with this controller
must be set between 25
and 80 psi (1.7 and 5.5 bar)
only.
Minimum Tank Size
2 gallons (7.6 liters)
4 gallons (15.1 liters)
4 gallons (15.1 liters)
8 gallons (30.3 liters)
4 gallons (15.1 liters)
8 gallons (30.3 liters)
8 gallons (30.3 liters)
20 gallons (75.7 liters)
Maximum Velocity 8 ft/sec. (2.4 m/s)
Min Pipe Dia
Pressure Tank
1/2"
Pre-charge (± 2 PSI)
4
3/4"
7
11
1"
14
18
1-1/4"
21
25
1-1/2"
28
32
2"
35
39
2-1/2"
42
46
49
53
56
60
63
67
Table 5
Max GPM (lpm)
4.9 (18.5)
11.0 (41.6)
19.6 (74.2)
30.6 (115.8)
44.1 (166.9)
78.3 (296.4)
176.3 (667.4)
17