Dover Ebsray R75, Инструкция по установке, эксплуатации и обслуживанию

Страница: 11 / 12

Publication No.: 2750-17
11
SECTION 7
– TROUBLESHOOTING
Symptom
Possible cause Symptom Possible cause
No Liquid
Delivery

No power to drive shaft

Coupling damaged or disengaged

Foreign matter in the pump

Ball Bearings seized

Inlet/Discharge valves closed

No liquid in supply tank

Incorrect direction of rotation

Strainer blocked

High static discharge pressure

Inadequate N.P.S.Ha

Pump vapour lock
Reduced
Output

Incorrect driver speed

Faulty driver

Discharge piping restricted

Strainer blocked

Inlet piping too small or too long

Foreign object in suction line

External bypass pressure setting too low

End of service life or adverse pumping
conditions
Excessive
Power
Consumption

Foreign matter in discharge line

Collapsed or kinked discharge hose

Pressure, Viscosity, Temperature or
Speed not as per design conditions

Foreign matter jamming parts

Pump out of alignment with driver

Parts worn

End of service life or adverse
pumping conditions
Excessive
Noise

Foreign matter jamming parts

Parts worn

End of service life or adverse pumping
conditions

Incorrect driver speed

Faulty or incorrect size driver
Leakage
from Pump

Seals incorrectly installed

Excessive dry running or pump

O-rings nicked, cut or twisted

O-rings not compatible with liquid

Worn or damaged shaft in seal zone

Misalignment causing excessive
shaft distortion

Excess system pressure

O-ring failure

Fasteners not tightened to specified
torque.

Thermal expansion of product when
locked between valves either side of
pump

Excessive static pressure

Seal faces cracked, scratched, pitted
or dirty