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4. LINE INSTALLATION
Digital Speed Control
Power Cord
Motor
Outlet
Inlet
4.1 Inlet Line
The suction line should be short and follow a direct route with a minimum number of elbows
and fittings. Elbows should be located as far as possible from the suction inlet to prevent
head loss due to increased friction. Excessive friction losses in the suction line could result in
pump cavitation, which causes poor performance, noise, vibration, damage to equipment, and
possible damage to the product. Whenever practical the diameter of the line at the suction
inlet should be increased in size. An eccentric tapered reducer should be used in lieu of a
concentric tapered reducer to prevent air pockets from forming and impairing pump efficiency.
The eccentric reducer may be placed at the inlet of the pump and should be positioned so the
straight side is up. A horizontal suction line must have a gradual rise to the pump. A high point
in the suction line will form an air pocket and prevent proper pump operation. All joints in the
suction line should be airtight to prevent air leakage, which can reduce pump capacity and
efficiency.
4.2 Outlet Line
Position the pump outlet line either vertical or top horizontal. The discharge line should be
short and direct with a minimum number of elbows and fittings. Elbows should not be used
at the discharge outlet as the friction encountered would be increased, resulting in head
loss. It is advisable to increase the line diameter at the discharge outlet to prevent head loss.
However, the use of a larger discharge line than recommended may reduce the total pump
head while increasing the pump volume, which can cause pump vibration due to overload.
Use of a discharge pipe smaller than the pump discharge outlet increases the total pump head
but decreases the volume. If a reducer is required on the outlet port of the pump and the
discharge is vertical, a concentric reducer should be used. If the discharge is horizontal, an
eccentric reducer should be used, which should be positioned with the straight side down.
CPE Systems Inc.
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www.cpesystems.com
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+1 800 668 2268
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