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3.1.4 Pipe Sizing
3.1.4.1 Suction and Discharge Pipe Sizing
When the pump is located up to 50 feet from the pool,
the recommended Schedule 40 minimum pipe size for
the suction side and discharge side of the pump is 1-
1/2" for FHPM.75 and 2" for FHPM1.0 and FHPM1.0-2.
NOTE: If the pipe is too small for the pump, or if the pump is
elevated too high above water, the maximum gallons
per minute (GPM) may not be delivered. If this happens,
the pump will develop an air pocket (cavitation) that will
make noise, and the life of the pump may be shortened.
3.1.4.2 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, which can trap air.
(High points are inverted 'U's above the inlet of a
pump. In plumbing, they are commonly referred to
as airlocks.)
Bad Install
Air Lock
Bad Install
90 Degree Elbow Too Close
Good Install
4x Pipe Diameter Into Pump
Best Install
Sweep Elbows In/Out for Maximum Efficiency
Page 8
Jandy
FHP Pumps | Installation & Operation Manual
®
3. For installations of equipment up to 100 feet from
the water, refer to the pipe sizing chart in the table.
For installations of equipment more than 100 feet
from the water, the recommended pipe size must be
increased to the next size. For every 50 feet beyond
100 feet, increase another 1/2" in diameter.
Maximum Flow
Pipe
Suction
Size
(6 feet per second)
1½"
37 GPM (140 LPM)
2"
62 GPM (235 LPM)
2½"
88 GPM (333 LPM)
3"
136 GPM (515 LPM)
Table 2.
Pipe Sizing Chart for Schedule 40 PVC
4. FHP Pumps come equipped with unions and 2"
NPT internal threads on both the suction and
discharge ports. This feature simplifies installation
and service.
5. The FHP Pump must be connected to at least two
(2) main drains (suction outlets) for each pool pump
suction line. Each drain (suction outlet) assembly
must be provided with covers and must be listed or
certified to the latest published version of ANSI
ASME
A112.19.8, or its successor standard, ANSI/
®
APSP-16. The suction outlets of the main drains
must be at least 3 feet apart or at different planes.
The suction outlets can be a drain and skimmer,
two (2) drains, two (2) skimmers, or a skimmer with
an equalizer line installed. For additional details and
guidelines, refer to ANSI/APSP 7, the standard for
Suction Entrapment Avoidance in Swimming Pools,
Wading Pools, Spas, Hot Tubs, and Catch Basins .
Check the local codes for proper installation
requirements. Applicable local codes will take
precedence over other codes.
NOTE: To prevent entrapment, the system must be built so that
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.
Unblockable SOFA – If acceptable by local code and the
Authority Having Jurisdiction (AHJ), a single unblockable
SOFA may be used. For an unblockable SOFA to qualify
as an unblockable drain under the Virginia Graham Baker
Act (VGBA), the Suction Outlet Fitting Assembly (SOFA)
shall be certified as unblockable, and be designated by
the manufacturer as unblockable, and the manufacturer's
instructions must state the SOFA is authorized for use as an
unblockable suction outlet in accordance with ANSI/APSP/
ICC-16. Certified unblockable SOFA's must be installed in
accordance with the manufacturer's instructions, the latest
edition of ANSI/PHTA/ICC-7, and applicable local code.
6. The piping must be well supported and not forced
together in places where constant stress will be
experienced.
7. Always use properly sized valves. Use the fewest
fittings possible. Every additional fitting increases
resistance and causes the pump to work harder.
NOTE: If more than 10 suction fittings are needed, the pipe size
must be increased.
Maximum Flow
Discharge
(8 feet per second)
50 GPM (189 LPM)
85 GPM (322 LPM)
120 GPM (454 LPM)
184 GPM (607 LPM)
/
®
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