Patterson HSC, Operation And Maintenance

Page: 7 / 16

4

Prime the pump in one of the following ways:
1. If the pump operates under positive pressure, open vent valve on top of the pump casing. After all
entrained air has escaped, close the vent valves. Rotate the shaft, if possible, to allow any air trapped
in the impeller passages to escape.
2. If the pump operates on a suction lift and a foot valve is included in the system, fill the pump and the
suction line with liquid from an outside source. Trapped air should be allowed to escape through the
vent valve while filling.
3. If the pump operates on a suction lift and no foot valve is provided, use a vacuum pump or ejector
operated by air, steam, water, etc. to evacuate air from the pump case and suction line by connecting
the ejector to the priming connection on top of the pump case.

Check direction of rotation before starting pump. Rotation should be the same as the direction arrow on
the case.
CAUTION:

Do not operate without liquid. Pump seals depend on the liquid being pumped for lubrication.

Make sure pump is primed and that no air is in the suction piping and the pump case.

Make sure all valves open or closed as required by your specific requirements.
Start driver:
Open discharge valve slowly when the pump is up to speed.
CAUTION:
Overheating and/or loss of prime will result if the pump is operated against a closed valve for more than
a few minutes.
NOTE:
Should the pump fail to build up pressure or discharge water when the discharge valve is opened, stop
the pump and read
Section Locating Operating Difficulties
.
4-2 Shutdown:
The pump may be stopped with the discharge valve open without causing damage. However, in order
to prevent water hammer effects, as a general recommendation the discharge valve should be closed
first.
1. Close discharge valve.
2. Stop driver.
3. If danger of freezing exists, isolate the pump by closing a valve in the pump suction line, if fitted, and
drain the pump completely.