Pipe Sizing - Jandy ePump Series Installation And Operation Manual

3.1.3 Pipe Sizing

NOTE All HP ratings given in this section apply to full-
rated pumps.
3.1.3.1 Suction Pipe
When the pump is located up to 50 feet from the
pool, the recommended minimum pipe size for the
suction side of the pump is 2" for .75 to 1.5 HP*. For
2.0 HP* pumps, the recommended pipe size is 2 ½". For
3.0 HP* pumps, the recommended pipe size is 3".
* HP refers to full rated pumps.
3.1.3.2 Discharge Pipe
When the pump is located up to 50 feet from the
pool, the recommended minimum pipe size for the
discharge side of the pump is 2" for .75 to 1.5 HP*. For
2.0 HP* pumps, the recommended pipe size is 2½". For
3.0 HP* pumps, the recommended pipe size is 3".
* HP refers to full rated pumps.
NOTE All pipe sizes are able to withstand the
pressures the pump will deliver, but not
necessarily the flow. If the pipe is too small
for the pump, or is elevated above water, the
maximum gallons per minute (GPM) may not be
delivered. If this happens, the pump will develop
a pocket of air (cavitation) that makes noise.
This may shorten the life of the pump.
3.1.3.3 Installation Recommendations
1. If the pump is located below water level, isolation
valves must be installed on both sides of the pump
to prevent the back flow of pool water during any
routine or required servicing.
2. To help prevent difficulty in priming, install the
suction pipe without high points (above inlet
of pump - inverted "U"s, commonly referred to
in plumbing as an airlock) that can trap air. For
installations of equipment up to 100 feet from the
water, refer to Table 1, the pipe sizing chart. For
installations of equipment more than 100 feet from
the water, the recommended pipe size must be
increased to the next size.
Table 1. Pipe Sizing Chart for Schedule 40 PVC
Pipe Maximum Flow
Size Suction
(8 feet per second)
1½" 50 GPM (189 LPM)
2" 85 GPM (322 LPM)
2½" 120 GPM (454 LPM)
3" 184 GPM (697 LPM)
ePump Series Pumps, Installation and Operation Manual
™
Maximum Flow
Discharge
(10 feet per second)
65 GPM (246 LPM)
105 GPM (397 LPM)
149 GPM (564 LPM)
230 GPM (871 LPM)
3. ePump Series Pumps come equipped with unions
on both the suction and discharge ports. This
feature simplifies installation and service and
eliminates the possibility of leaks at threaded
adapters.
4. The ePump Series Pump must be connected to at
least two (2) hydraulically-balanced main drains
for each pool pump suction line. Each drain must
be provided with covers that are listed or certified
to the latest published edition of ANSI/ASME
A112.19.8. The suction fittings of the main drains
must be at least three (3) feet apart or at different
planes. The suction fittings can be a drain and
skimmer, two (2) drains, two (2) skimmers, or a
skimmer with an equalizer line installed. Check
the local codes for proper installation.
NOTE To prevent entrapment, the system must be
built so it cannot operate with the pump drawing
water from only one (1) main drain. At least two
(2) main drains must be connected to the pump
when it is in operation. However, if two (2) main
drains run into a single suction line, the single
suction line may be equipped with a valve that
will shut off both main drains from the pump.
5. The piping must be well supported and not forced
together where it will experience constant stress.
6. Always use properly sized valves. Jandy Diverter
Valves and Jandy Ball Valves typically have the
best flow capabilities.
7. Use the fewest fittings possible. Each additional
fitting has the effect of moving the equipment
farther away from the water.
NOTE If more than ten suction fittings are needed, the
pipe size must be increased.
8. Every new installation must be pressure tested
according to local codes.
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