Utilitech UT11501IGPP - Suction Outlet and Water Velocity Standards

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INSTALLATION INSTRUCTIONS
Suction Outlets Per Pump
Provide at least two hydraulically balanced main
drains, with covers, as suction outlets for each
circulating pump suction line. See Figure 3. The
centers of the two main drains (suction outlets) on
any one suction line must be at least 3 ft. apart.
The system must be built so that it cannot operate
with the pump drawing water from only one main
drain (e.g., 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, that suction line may be
equipped with a valve (not included) which will shut
off both main drains from the pump.
More than one pump can be connected to a single
suction line as long as the above requirements
are met.
Water Velocity
The maximum water velocity through the suction
tting or cover for any suction outlet must be
1.5 ft. per second unless the outlet complies with
the latest ASME/ANSI specication for Suction
Fittings For Use in Swimming Pools, Spas, Hot
Tubs, and Whirlpool Bathtub Applications. In any
case, do not exceed the suction tting’s maximum
designed ow rate.
If 100% of the pump’s ow comes from the main
drain system, the maximum water velocity in the
pump suction hydraulic system must be 6 ft. per
second or less even if one main drain (suction
outlet) is completely blocked. The ow through the
remaining main drain(s) must comply with the latest
ASME/ANSI specications for Suction Fittings
For Use in Swimming Pools, Spas, Hot Tubs, and
Whirlpool Bathtub Applications.
Testing and Certication
Suction outlet covers must have been tested by a
nationally recognized testing laboratory and found
to comply with the latest ASME/ANSI specications
for Suction Fittings For Use in Swimming
Pools, Spas, Hot Tubs, and Whirlpool Bathtub
Applications.
Fittings
Fittings restrict ow. For best efciency, use fewest
possible ttings (but at least two suction outlets).
Avoid ttings which could cause an air trap. Pool
ttings must conform to International Association