9
1450-rpm electric motor). The centrifugal pump should be started or stopped automatically and
simultaneously with the drilling pump. On DC electric drilling rig, generally a sign got from DC control
disc excites magnetic starter.
Centrifugal pump also can be driven by belt and the force comes from pinion shaft of pump.
When arranging suction lines, charging pump is adopted by-passed connection, so operation can be
continued even if pump is failed or repaired. Operation without a charging pump, soft suction valve
spring can be used to improve suction performance.
Suction dampener is a very effective aid for improving suction performance and eliminating fluid
pulsations in the suction line, which results in a smoother flow in the discharge line.
Attention: Do not connect the return line of the shear relief valve with suction pipelines
since when relive valve is open, which will cause a sudden risen pressure; when the
pressure is higher than rating pressure value, manifold
、
suction dampener and centrifugal
pump will be damaged.
1.4. The Preparation of Power End
F-series mud pump has been completely assembled and test operated before being shipped to the
field. Unless otherwise instructed, the lubrication is drained from the power end. Before operating the
pump, the following must be performed or checked.
1.4.1. Power End Lubrication
Before injecting lubricant, open inspection door of cover, check if oil in power end reservoir goes bad,
remove the pipe plugs (No. 2 in Fig.7) on each side of the pump, drain all the remaining lubrication oil
and flush. Add the proper type and quantity of lubrication in the power end (Refer to nameplate on
pump frame for type and quantity required).
Recheck oil level after pump has operated for 15 minutes. Shut pump down and allow approximately
five minutes for the oil level to equalize, Check oil level gauge, (No. 1 in Fig. 7). It is usually necessary
to refill about 10L (3 gallons) oil since a certain amount is retained in the crosshead area and frame
cavities.
1.4.2. Installation of Crosshead Extension Rods and Stuffing Box Seals
Fig. 4
