5 Operation
5.1 Start-up check
Rotate pump shaft by hand to be sure it is free. If pump cannot be turned by hand, or binding and rub-
bing are noticed, correct before starting. Insure that alignment and rotation procedures in Installation sec-
tion have been followed.
5.2 Start-up procedure
1.
Pump suction pipe and pump must be full of liquid before pump is started. Open suction valve fully
and prime the pump. Vent air out of pump through recirculation line Or gauge connection at pump
discharge. If suction supply is below pump, priming can be accomplished by an ejector or priming
pump. A foot valve should be used in the suction line to maintain the prime when pump is shut
down.
2.
If auxiliary piping for cooling and/or flushing from an outside source is being used, open valves and
establish flows.
3.
The pump discharge valve should be not more than 10% open to establish and control flow.
4.
Start the pump. Slowly open the discharge valve as the system fills and pressurizes.
5.3 Operational checks
Inspect pump carefully and frequently during the first few hours of operation. Mechanical seal may weep
slightly but should "run in” in a few hours. Be sure all auxiliary lines (cooling, flushing, sealing, etc.) are
functioning properly. Check pump bearings for excessive heating. An uncooled bearing temperature of
190° is normal. Check motor for excessive heating. Check complete unit for excessive vibration or un-
usual noise. Do not run pump at greatly reduced flow because all the motor horsepower will go into heat-
ing the liquid in the pump and damage may result. Do not run pump beyond maximum recommended
flow since damage could result due to excessive wear on the back washers (546).
Table 2: Recommended flow
Maximum recommended flow
HDB210
60 Hertz Speed->3550 RPM
5O Hertz Speed 2900 RPM
280 GPM (63.6 m
3
/h)
230 GPM (52.3 m
3
/h)
Minimum flow for 14 stage pump only
90 GPM (63.6 m
3
/h)
82 GPM (18. 6 m
3
/h)
5.4 Shut down procedure
If pump is installed with a check valve, it can be shut down without closing any valves. When no check
valve is used, the discharge valve must be closed before the pump is stopped to prevent backflow
through the pump. If the pump is to be serviced, be sure suction valves are closed, auxiliary cooling and
flushing flows are shutoff and motor is locked out before working on pump.
5 Operation
3335 Installation, Operation and Maintenance Instructions
11
