UB USER INSTRUCTIONS ENGLISH 71569247 07-04

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5.5.2 Suction lift with foot valve fitted

Fill suction pipe and casing with liquid at a pressure of 1 to 2 bar from an external source. Vent as described in section 5.5.1.

5.5.3 Suction lift without foot valve

Pump casing vents on the suction volute must be connected to an external vacuum pump priming system. If in doubt please consult Flowserve.

Possible

 

priming

To vacuum

points

 

pump

5.6 Starting the pump

a) Ensure flushing and/or cooling/ heating liquid supplies are turned ON before starting the pump.

b)CLOSE 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)If the pressure is satisfactory, slowly OPEN outlet control valve.

h) Do not run the pump with the outlet valve closed for a period longer than 30 seconds.

i)If NO pressure, or LOW pressure, STOP the pump. Refer to section 7, Faults; causes and remedies, for fault diagnosis.

5.7 Running the pump

5.7.1 Venting the pump

Vent the pump to enable all trapped air to escape taking due care with hot or hazardous liquids.

Under normal operating conditions, after the pump has been fully primed and vented, it should be unnecessary to re-vent the pump.

5.7.2 Pumps fitted with packed gland

If the pump has a packed gland there must be some leakage from the gland. Gland nuts should initially be finger-tight only. Leakage should take place soon after the stuffing box is pressurised.

The gland must be adjusted evenly to give visible leakage and concentric alignment of the gland to avoid excess temperature. If no leakage takes place the packing will begin to overheat. If overheating takes place the pump should be stopped and allowed to cool before being re-started. When the pump is re-started, check to ensure leakage is taking place at the packed gland.

If hot liquids are being pumped it may be necessary to slacken the gland nuts to achieve leakage.

The pump should be run for 30 minutes with steady leakage and the gland nuts tightened by 10 degrees at a time until leakage is reduced to an acceptable level, normally a minimum of 120 drops per minute is required. Bedding in of the packing may take another 30 minutes.

Care must be taken when adjusting the gland on an operating pump. Safety gloves are essential. Loose clothing must not be worn to avoid being caught up by the pump shaft. Shaft guards must be replaced after the gland adjustment is complete.

Never run gland packing dry, even for a short time.

5.7.3Pumps fitted with mechanical seal Mechanical seals require no adjustment. Any slight initial leakage will stop when the seal is run in.

Before pumping dirty liquids it is advisable, if possible, to run in the pump mechanical seal using clean liquid to safeguard the seal face.

External flush or quench should be started before the pump is run and allowed to flow for a period after the pump has stopped.

Never run a mechanical seal dry, even for a short time.

5.7.4 Bearings

If the pumps are working in a potentially explosive atmosphere, temperature or vibration monitoring at the pump bearings is recommended.

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