Flowserve VTP Wet Pit - Manual (Page 35)

VERTICAL TURBINE PUMPS (VTPS) CENTRIFUGAL PUMPS ENGLISH 71569224 – 10-13
Page 35 of 76 flowserve.com
5 COMMISSIONING, STARTUP,
OPERATION AND SHUTDOWN
These operations must be carried out
by fully qualified personnel. Turn off power supply for
safety while pump commissioning is in progress.
Pre-commissioning Procedure 5.1
The gland is to be filled with grease and flush supply
to be in place. Flush piping to be checked for leaks.
Mechanical seals to be checked for leaks, flush flow
and pressure.
a) Pumps with the enclosing tubes and oil-lubed
bearings must be filled with the proper lubricant to
avoid running dry and to guarantee acceptable
performance of the pump. A separate oil tank is
attached to the pump (see detail in section 5.2.2).
b) For can pumps check all vent connections for
complete filling of the pump. The venting
procedure can take from 10 minutes up to 2 hours,
depending on the kind of fluid .
c) Check the direction of rotation of the pump
(Coupling spacer dismantled). Should be counter
clockwise when viewed from the driver end.
d) The pump rotor and the shaft seal must be in
correct axial position.
e) Check the readiness of all auxiliary systems (seal
sys., lubrication system etc.,) for startup.
f) All pipe work, including the internal and the
auxiliary pipe work, must be connected correctly
and must be absolutely tight. Check the tightness
of all connections of the auxiliary pipe work. The
suction valve must be open, the discharge valve
shall be closed or partially open as required.
g) Turn the pump by hand, if required with the help of
a lever, to check the free rotation of the rotor. The
rotor must turn uniformly and noiselessly. Some
resistance may be felt due to the friction in the
bearings and seals.
h) Check the readiness of the driver for startup. Refer
to the manual for the driver to be sure that all
precautions are in place to energize the motor.
Pump Lubricants 5.2
Other than the stuffing box lubrication, mechanical
seal and/or lineshaft lubrication, the pump will not
require further periodic lubrication. On water pumps,
the suction bearing on the bowl assembly should be
repacked when required. Pumps that pump
hydrocarbons or have carbon, rubber, epoxy or
Teflon suction bearings do not have the suction
bearings packed. If the pump will be started after a
longer storage period, the bearings should be first
flushed and cleaned by using a suitable cleaning
agent. It is not necessary to remove the oil sprayed
for short or long-term storage as this will mix up
thoroughly with the lubrication oil.
Re-checking the motor lubrication should
be in accordance with the motor manufacturer’s user
instructions supplied separately with the pump.
Open lineshaft lubrication 5.2.1
Open lineshaft bearings are lubricated by the pumped
fluid where the static water level is less than 9 m (30 ft)
below the discharge head and will usually not require
pre or post-lubrication. Care is to be taken to ensure
that the gland or seal is supplied with the required
flush flow.
All open lineshaft pumps where the static water level is
more than 9 m (30 ft) below the discharge head should
be adequately pre-lubricated before starting the pump.
Pre-lubrication duration 5.2.1.1
Allow flush water to flow down the shaft for 45
minutes for pumps over 9 m (30 ft) and increase the
pre-lube duration by at least 15 minutes for every 5 m
(15 ft) additional shaft length beyond 20 m (65 ft).
The fittings for pre-lube are provided at the discharge
head.
Typical pre-lube pipe connection 5.2.1.2
(examples (a) thru (d))
In general all W type cast discharge heads are
provided with a standard size pipe fitting for pre-lube
connection. Fabricated discharge heads are fitted
with a special piping arrangement to allow pre-lube
liquid flow onto the shaft.
It is the responsibility of the user to install a
reliable pre-lube system to achieve the pump pre-
lubrication. Flowserve will not supply these types of
systems or accessories with the pump.