Page 374 - The Tribology Handbook

c19 Commissioning lubrication systems

Table 19.2 Fault finding - total-loss systems

Condition Cause Action
1 System will not start (automatically (a) Incorrect supply to pump prime Check electrical, pneumatic or hydraulic
operated systems) mover supply
(6) System controls not functioning or Check controls and test each function
functioning incorrectly separately
2 System will not build up required (a) Faulty pump Isolate pump, check performance and
operating pressure, or normal pump- repair or replace as necessary
ing time is prolonged
(a) Loss of pump prime (1) Bleed air from pump
(2) Check for blockage in reservoir line
strainer
Relief valve bypassing If with relief valve isolated pump builds
pressure, repair or replace relief valve
(4 Broken or leaking supply line(s) Find break or leak and repair
(4 Air in supply line(s) Bleed air from line(s) as for filling
(systems incorporating metering valves) (f) Trace by isolating metering valves syste-
Bypass leakage in metering valve@)
matically and repair or replace faulty
valve(s)
3 System builds up operating pressure (a) Changeover control device faulty Isolate from system, check and repair or
at pump but will not complete lubrica- replace
tion cycle
(systems incorporating electrical and/or (6) Incorrect piping to control device Check and rectify as necessary
pressure control devices in their opera- (c) Incorrect wiring to control device Check and rectify as necessary
tion)
4 System builds correct operating pres- If with delivery line(s) disconnected,
sures but metering valve(s) fails/fail to valve@) then operates/operate:
operate (a) Delivery piping too small Change to larger piping
(systems incorporating metering valves
operating pressurised supply line/s) (6) Blockage or restriction in deliveryline Clean out or replace
(c) Blockage in bearing Clean out bearing entry and/or bearing
If with delivery line(s) disconnected, Clean out or replace
valve(s) still fails/fail to operate
(d) Metering valve contaminated or
faulty
5 System builds excessive pressure (a) Blockage or restriction in main supply Trace and clean out or replace faulty
line section of pipework
(6) Supply pipe too small (1) Change to larger piping
(2) Lubricant too heavy
Seek agreement to use lighter lubricant
providing it is suitable for application
(direct-feed systems) (c) Delivery line piping too small Change to larger piping
(d) Blockage or restriction in delivery line Clean out or replace
(e) Blockage in bearing Clean out bearing entry and/or bearing
(direct-feed systems incorporating divider- (f) Metering valve(s) contaminated or Clean out or replace
type metering valves) faulty [see 4(d) above]

C19.4