Page 440 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Lube, Seal and Control Oil System Best Practices Best Practice 7 .19

Oil flush acceptance
Pre-flush checklist
The oil flush of the subject system has been conducted in
Owner Vendor
accordance with site procedures and accepted.
1. System configuration per reference ____________ ____________ Date of flush _______________Time started________________
drawings. Time completed_______________
2. Old oil has been removed and ____________ ____________ Inspected and accepted by _____________ Date___________
reservoir/filter housing wiped clean. Owner ________________
3. Filters and screens installed for ____________ ____________ Vendor representative ____________
flushing.
4. All required instrumentation ____________ ____________
calibrated.
5. Lube/seal oil filled to capacity. ____________ ____________
6. Bearing housings ready to accept ____________ ____________
flow.
7. Initial oil temperature reached. ____________ ____________
8. Approval to initiate oil flush. ____________ ____________

Best Practice 7.19Practice 7.19
Best

Monitor oil filter change time (when the filter differential Many machinery component failures have had a root cause in
pressure alarm is activated) to clean oil tank and rundown failure to clean oil reservoirs and rundown tanks.
tanks. Particular attention is drawn to overhead seal oil tanks that have
never been cleaned, but are exposed to the process gas and associ-
All gravity drain oil systems accumulate debris (oil sludge, etc.) in
ated process debris (seal gas reference line located on top of the seal
the oil reservoir after a certain time.
oil tank without the use of a separation bladder). Every time the unit is
Increasing frequency of oil filter change (significant increase e say
from once per year to once every six months) indicates a need to clean shut down, any oil contained in the tank and all associated debris
the oil reservoir and rundown tanks at the next turnaround. enters the seal without the benefitof filtration.
A preventive maintenance (time based) approach to cleaning oil
reservoirs exposes the plant to reliability issues if not done properly. Benchmarks
This best practice is a predictive maintenance approach that will This best practice has been used since the early 1990s, when bushing
minimize oil reservoir and overhead tank cleaning cycles whilst still seal failures were experienced because the overhead seal oil tanks had
ensuring machinery reliability. never been cleaned. The implementation of this best practice has
optimized critical unit reliability and minimized tank cleaning previously
Lessons Learned performed on a preventive maintenance (time based) basis.
Failure to monitor and clean oil reservoirs and rundown
tanks has caused many machinery component failures.

B.P. 7.19. Supporting Material
Please refer to material in B.P: 7.18.

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