Page 373 - The Tribology Handbook

Co m m issio n in g 1 u br icat i o n systems c19

FILTER PRESSURE-REGULATING VALVE
(a) Basket an'd cartridge type--check for cleanliness. (a) Diaphragm-operated type-with pump motor
(6) Edge type (manually operated) -rotate several times switched on, set pressure-regulating valve by opening
to check operation. isolation valves and diaphragm control valve and
(c) Edge type (motorised)-check rotation and verify slowly closing bypass valve.
correct operation. Adjust initially to system-pressure requirements as
(d) Where differential pressure gauges or switches are specified.
fitted, simulate blocked filter condition and set accord- (b) Spring-pattern type-set valve initially to system-
ingly. pressure requirements as specified.

PRESSURE VESSEL
(a) Check to ensure safety relief valve functions correctly. COOLER
(b) Make sure there are no leaks in air piping. Check water supply is available as specified.

Running tests and adjustments
Run pump(s) check output at points of application, be tested separately by simulating the appropriate
and finally adjust pressure-regulating valve to suit alarm condition.
operating requirements.
Where fitted, set pressure and flow switches as specified Fault fin ding
in conjunction with operating requirements. Action in the event of trouble is best determined by
Items incosrporating an alarm failure warning should reference to a simple fault finding chart illustrated in
Table 19.1

FAULT FINDING
Table 19.1 Fault finding - circulation systems

Condition Cause Action
(1) System will not start Incorrect electrical supply to pump motor Check electrics

(2) System will not build up required (u) Leaking pipework Find break or leak and repair
operating pressure
(b) Regulating bypass valve open Check and close
Pressure-regulating valve wrongly Check and re-set to increase pressure
adjusted
Loss of pump prime Check suction pipework for leaks
Blocked system filter Inspect and clean or replace
Low level of oil in reservoir TOP UP
Pump relief valve bypassing Check and repair or replace as necessary
Faulty pump Check and repair or replace as necessary
(3) System builds up abnormal operat- (4) Pressure-regulatingisolation and dia- Check and open
ing pressure phragm-control valves closed
(b) Pressure-reguiating valve wrongly Check and re-set to decrease pressure
adjusted
(4) Oil fails to reach points of applica-
tion
(i) via onifices or sprays Blockage or restriction Clean out
(ii) via flow control valves (4) Control valve wrongly adjusted Check and re-set
(6) Blockage or restriction in delivery Clean out or replace as necessary
line
(iii) via metering valves (a) Metering valve contaminated or Clean out or replace
faulty
(b) Blockage or restriction in delivery Clean out or replace
line
(in) via pressurised sight feed Air supply failure Check and restore correct air supply
indicators

C19.3