CPE C218 Handbuch - Seite 6

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4. LINE INSTALLATION

Digital Speed Control

Power Cord

Motor

Outlet

Inlet

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.

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.

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