Berkeley S.A.E., Инструкция по установке, ремонту и эксплуатации, Страница: 15 / 28

PRIMING
Pump priming is the displacement of air with water in the
pump and suction piping. Pump
MUST BE completely filled
with water when operating.
Refer to Page 14 for instruction on the following conditions:
1. Suction lift with priming pump (water source below pump).
2. Suction lift with exhaust primer (water source below pump).
3. Suction lift with foot valve (water source below pump).
4. Flooded suction (water source above pump, or incoming
water pressure is greater than atmospheric pressure).
Special Case – Hydraulically Balanced Pumps
Packed Pumps:
Hydraulically balanced pumps operate at a very low positive
pressure across the stuffing box, permitting a much looser fit
of the packing rings around the shaft sleeve to control the loss
of water from the pump through the stuffing box. Because of
the looser fit of the packing rings, air can be more easily
drawn into the pump through the stuffing box when priming
the pump with an air evacuation type primer.
A grease fitting, communicating through the side of the
stuffing box to a lantern ring in the packing set, is provided to
grease-seal the stuffing box to prevent air leakage during
priming.
If pump cannot be primed due to air leakage through stuffing
box,
DO NOT tighten packing. Instead, pump NLGI No. 4
Water Pump Grease into lantern ring until back pressure
occurs forcing grease into the lantern ring, grease sealing the
stuffing box. After priming, when unit is put into operation, the
grease will be flushed out through the packing by the water
flowing outward through the stuffing box. Proceed with normal
adjustment of the packing as described on Page 17. Note that
the grease seal only is used for control of air leaking during
priming, and that only the packing gland is used to control the
flow of water the stuffing box during normal operation.
When necessary to replenish the grease supply, use an NLGI
No. 4 Water Pump Grease.
Mechanically Sealed Pumps:
Mechanically sealed pumps require no special procedures
unless they are mounted vertically. In this case, call Berkeley
Customer Service at 1-888-237-5353 for more information.
STARTING
Never run pump dry. Running pump without
water will overheat pump and damage internal parts. Always
make sure pump is primed prior to start-up.
Engine Operation
Refer to engine owner/operator manual supplied with pump for
starting and operating instructions.
Pump performance varies depending on engine RPM. Refer to
engine operators manual to adjust engine speed.
Risk of Engine Damage. Operating pump at
lower than rated head can cause excessive load on engine. In
addition, pump has the capability of overloading engine if
allowed to run continuously at an RPM or flow rate that is
above specified hydraulic performance.
Risk of pump damage. Operate the engine in
its preferred RPM range. Reduced RPM for long periods may
damage the pump liquid end.
Pump Operation
Prime pump by one of the previous described procedures.
Start engine. Slowly open discharge valve until desired flow
rate is achieved, or pump is operating against head for which it
was selected.
After pump is running, allow packing to leak liberally for a few
moments. Then tighten gland nuts one complete turn each
until leakage is reduced to 40 to 60 drops a minute.
If pump is equipped with a rotary mechanical seal, no
adjustment is necessary.
Shutting Down
Close discharge valve to hold prime before stopping pump.
Valve should remain closed until pump/engine is restarted.
Reduce the engine RPM prior to shutting down to reduce
hydraulic shock (water hammer).
F00636 Page 15
Pump Priming
Start-Up