Flowserve Twin Screw Rotary - Manual (Page 31)

TWIN SCREW PUMPS. ORIGINAL USER INSTRUCTIONS. ENGLISH. 71569243 – 07/10
Page 28 of 53
®
Typical oils per Column "B" in Section 5.2.1. Change
oil every 6 months or seasonally.
For high temperature service between 60
° and
120
°C (140 ° and 250 °F):
Oil should meet AGMA Standard 250.04 AGMA
Lubricant No. 7 (not compounded), viscosity range
414 to 506 cST at 40
°C.
Typical oils per Column "C" in Section 5.2.1.
60
° to 82 °C (140 °to 180 °F) - change oil every
four months
82
° to 104 °C (180 ° to 220 °F) - change oil every
two months
104
° to 120 °C (220 ° to 250 °F) - change oil
every month
For temperatures above 120
°C (250 ° F):
Same requirements as for high temperature service
between 60
° and 120 °C (140 ° and 250 ° F).
Initial start-up oil must be drained and replaced after
24 hours running time.
Change oil weekly.
5.3 Direction of rotation
Ensure the pump is given the same
rotation as the pump direction arrow cast on, or
affixed to, the pump casing.
To avoid dry running the pump must either be filled
with liquid or have the flexible coupling disconnected
before driver is switched on.
If maintenance work has been carried
out to the site's electricity supply, the direction of
rotation should be re-checked as above in case the
supply phasing has been altered.
5.4 Guarding
Guarding is supplied fitted to the pump set. If
this has been removed or disturbed ensure that all the
protective guards around the pump coupling and
exposed parts of the shaft are securely fixed.
5.5 Priming and auxiliary supplies
Before starting any rotary pump it is absolutely
necessary that both the pump and suction line be
primed with liquid. This can be accomplished by one
of the following methods:
1. Remove pipe plug from discharge side of body
and install a temporary filling line. Pour
approximately 264 cubic metres (one gallon) of
the liquid being pumped into the pump through
this line while rotating the pump by hand in the
opposite direction from that shown on the
rotation arrow. This will cause the oil to work into
the pumping rotors to help seal while priming.
Turn temporary filling line down and direct into
the baseplate drip pan or some other suitable
container. Start the pump, running it in the
rotation shown on the rotation arrow. When a
solid stream of oil is achieved from the filling line,
stop the pump, remove the piping and replace
the pipe plug.
2. When the liquid supply level is above the pump
discharge valve, it is primed by opening the
suction and discharge valves. The in-flowing
liquid will displace the air and fill the suction line,
pump casing and discharge line up to the level of
supply.
3. When the above two methods are unsuitable, it is
necessary to vacuum prime the pump. This can
be accomplished with a vacuum pump or air
ejector. The priming line is attached to the upper
most portions of the discharge suction piping. To
prime, close the discharge valve and do not start
the driver until the pump and piping are full of
liquid. Provision must be made to seal the
stuffing box with sealing fluid to prevent in
leakage of air.
It should be noted that if a valve is not provided on
the discharge side of the pump it may be necessary
to prime the entire system to avoid excessive power
consumption on initial start-up.
5.6 Starting the pump
a) Ensure flushing and/or cooling/
heating liquid supplies are turned ON before
starting the pump.
b) OPEN the outlet valve.
c) OPEN all inlet valves.
d) Prime the pump.
e) Ensure all vent connections are closed
before starting.
f) Start motor and check outlet pressure.
g) Do not run the pump with the
outlet valve closed.