Thrush PC2G User Manual

OPERATING AND MAINTENANCE INSTRUCTIONS

FOR PC/E-300 & PC2G CLOSE-COUPLED END

SUCTION CENTRIFUGAL PUMPS

The THRUSH End Suction Centrifugal Pump has been carefully assembled and factory tested to
provide years of trouble free service. In order to insure the service intended, the following
information is provided to enable proper installation, operation and maintenance of this product.

INSTALLATION

LOCATION

The pump should be located as close to the liquid source as possible so that the suction line can
be short and direct. It should be located in a clean, open area, where it is easily accessible for
inspection, lubrication and repair. Pumps installed in dark, dirty areas or in cramped locations are
often neglected which can result in premature failure of both the pump and the driver.

Adequate provisions should be made for electrical wiring to the pump motor. A switch and an
overload protection should be installed near the pump unless it is impractical. The electrical
conduit should be positioned in such a way as to preclude the possibility of moisture entering the
conduit or the motor and causing short circuits.

FOUNDATION

The foundation must be sufficiently rigid to absorb any vibration and stress encountered during
pump operation. A raised foundation of concrete is preferable for most floor-mounted pumps.
The raised foundation assures a satisfactory base, protects against flooding, simplifies moisture
drainage and facilitates keeping the area clean.

The pump should be firmly bolted to the foundation, whether it is a raised concrete base, steel
work wall, or structural member. The mounting bolts or studs should be accurately located per
the applicable THRUSH dimension sheet. Foundation bolts should be enclosed by a sleeve 2 to
4 diameter larger than the bolt to allow movement for proper alignment with the pump mounting
holes. Refer to Figure 1. If the pump is to be mounted on steel work or other structure, adequate
support should be provided to the base plate or the structure could produce excessive strain on
the pump casing and piping and seriously affect alignment of the pump and driver.

Figure 1
MOUNTING

The pump unit should be set on the foundation, being careful not to damage the threads on the
foundation bolts. The flexible coupling halves should be disconnected. Shims should be inserted
and the pump leveled. A spirit level should be used on the faces of the flexible coupling halves
and on the suction and discharge flanges. If the pump has threaded nozzles, a short piece of
pipe inserted in the nozzles will serve as a smooth surface for a leveling reference point. The
shims should be adjusted until the pump is leveled horizontally and vertically. Tighten the
foundation bolts finger tight.

GROUTING, IF BASE PLATE IS USED

Grouting the base plate prevents lateral movement of the base plate and improves the vibration
absorbing characteristics of the foundation by increasing its mass. A wooden dam should be
constructed around the base plate to contain the grout while it is being poured. The entire base
plate should be filled with grout. Allow 48 to 72 hours for grout to dry. After grout is thoroughly
dried, firmly tighten foundation bolts.

PIPING

The piping practices you follow will directly affect the efficiency and power consumption of your
pump. Pay particular attention to the seemingly insignificant details involved in piping for they
make the difference between a good and bad installation. BOTH THE SUCTION AND THE
DISCHARGE PIPING SHOULD BE INDEPENDENTLY SUPPORTED NEAR THE PUMP;
LIBERAL USE OF PIPE HANGERS AND SUPPORT BLOCKS WILL PREVENT EXCESSIVE
STRAIN ON THE PUMP CASING AND THE PIPE JOINTS. The suction diameter should be at
least the same diameter as the suction nozzle on the pump and preferably larger. Use of a
smaller diameter pipe will result in loss of head due to friction. All joints must be tight to maintain
prime on the pump.