STA-RITE DYNA-WAVE MPRA Series, Owner'S Manual

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4
To avoid a strain left by a gap at the last connection,
start all piping at the pump and run pipe away from the
pump. To avoid airlocking, slope suction pipe slightly
upward toward the pump.
NOTICE: To prevent flooding when removing pump for
service, all flooded suction systems must have gate
valves in suction and discharge pipes.
PUMP SUCTION
REQUIREMENTS
Pump suction is hazardous and can trap and drown
or disembowel bathers. Do not use or operate
swimming pools, spas, hot tubs or water features if a
suction outlet cover is missing, broken, or loose. Follow
the guidelines below for a pump installation which
minimizes risk to users of pools, spas, hot tubs and water
features.
Entrapment Protection
The pump suction system
must provide protection
against the hazard of
suction entrapment or hair
entrapment/entanglement.
Suction Outlet Covers
All suction outlet covers
must be maintained. They
must be replaced if
cracked, broken, or
missing.
See Page 5 for outlet cover
certification requirements.
All suction outlets must have
correctly installed, screw-
fastened covers in place.
Suction Outlets Per Pump (Figure 3)
Provide at least two hydraulically balanced main drains,
with covers, as suction outlets for each circulating pump
suction line. The centers of the main drains (suction
outlets) on any one suction line must be at least three feet
apart.
The system must be built so that it cannot operate with
the pump drawing water from only one main drain (that is,
there must be at least two main drains connected to the
pump whenever it is running – see Figure 3 ). However, if
two main drains run into a single suction line, the single
suction line may be equipped with a valve which will shut
off both main drains from the pump (see Figure 3 ). More
than one pump can be connected to a single suction
line as long as the requirements above are met.
Water Velocity
The maximum water velocity through the suction fitting
or cover for any suction outlet must be 1.5 feet per
second unless the outlet complies with the latest
ASME/ANSI Specification for Suction Fittings For Use in
Swimming Pools, Spas, Hot Tubs, and Whirlpool
Bathtub Applications. In any case, do not exceed the
suction fitting’s maximum designed flow rate.
If 100% of the pump’s flow comes from the main drain
system, the maximum water velocity in the pump
suction hydraulic system must be six feet per second or
less even if one main drain (suction outlet) is completely
blocked. The flow through the remaining main drain(s)
must comply with the latest ASME/ANSI Specification
for Suction Fittings For Use in Swimming Pools, Spas,
Hot Tubs, and Whirlpool Bathtub Applications.
Hazardous suction.
Can trap hair or
body parts, causing
severe injury
or death.
Do not block
suction.
At Least
3 Feet
Suction Outlet
(Main Drain)
Suction Outlet
(Main Drain)
IAPMO Certified
Anti-entrapment
Cover or Suction Fitting,
screw-fastened to
Main Drain Sump
IAPMO Certified
Anti-entrapment
Cover or Suction Fitting,
screw-fastened to
Main Drain Sump
Pump
Valves OK between
pump and Tee
No valves between
Tee and Main Drains
2762 0197
Figure 3 - Recommended pump suction layout.