Page 439 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Be st Practice 7 .18 Lube, Seal and Control Oil System Best Practices
3.2 The following parameters shall be documented in the 3.6 Add 100-mesh white cloth (backed with 60-mesh
log on an hourly basis: screen) to all lube and seal oil supply points on
- Pump discharge pressure equipment bearings, seals and control oil inlets. Flush
- Bearing header pressure until the criteria as stated in paragraph 3.9/3.10 is
- Oil reservoir temperature achieved, but for a minimum period of 24 hours.
- Bearing header temperature
- Oil filter differential pressure Note: During final flush, alternate flushing through each
filter/cooler section, control valves and their bypasses.
- Filter in use
- Sections of piping being flushed 3.7 Whenever practical, circulation shall be continued from
- Start time the time of startup until completion on a 24 hour per day
3.3 The drain oil sight flow gauges shall be continually basis. Any irregularities shall be immediately reported to
monitored for flow at all places. The complete filling of the vendor representatives and the applicable owner
the sight glass indicates a flow blockage. Immediate representative as designated, which will be posted on the
action shall be taken to stop circulation and clean filter accessory skid control panel.
screens. The debris obtained on the screen shall be 3.8 Owner’s quality control representative will monitor all
collected into plastic bags, identified by screen location, operations for compliance and verify all records, test
machine number and time. parameters and acceptance criteria on a surveillance basis.
3.4 The following schedule shall be used for flushing: Final screen particle count will be verified and recorded
- Add 100-mesh screen with 60-mesh backup screens by quality control.
at oil reservoir and degassing tank if applicable as 3.9 The oil system acceptance criteria which shall be the basis
stated in paragraph 2.5 and flush through total system for witness approval parameters for contractor and/or
at 15 minute intervals until screens are reasonably owner shall be as follows:
clean. Monitor closely the return lines on a continuous Screen contamination shall be within the particle count limits
basis to ensure system is not backing up with oil. according to the size of pipe. It will be determined as follows:
- Flush through total system at intervals of one hour 20 non-metallic particles on pipe 1" to 2"
until screens are reasonably clean. 50 non-metallic particles on pipe 2" to 4".
- Flush total system, alternating through systems 3.10 Particles shall not be metallic and shall display random
section until screens are clean. Supply lines shall be distribution on the screen.
alternated to ensure a greater than 150 percent oil 3.11 The acceptance of the system shall be after installation/
flow is maintained at all times. inspection 100-mesh cloth covered screens, then
- Add 100-mesh screens with 60-mesh backup screens circulating the lube oil an additional four hours and re-
to lube and seal oil inlet lines to all equipment. Also inspecting the screens. The final four hours’ flush should
add 100/60 mesh screens to overhead and seal oil be with valves open allowing full flow through the system
tanks, reference lines and coupling guard feed lines at operating temperature. Final acceptance requires an oil
(if furnished). analysis to determine metal content, viscosity and water
- Repeat ‘flush total system’ above. content.
- Alternate flushing through each filter/cooler section, 3.12 Following acceptance the system shall be restored by the
control valves and their bypasses, overhead tanks, owner for normal operation including the following
seal oil traps and reference gas lines. Record. Note: A actions:
differential pressure of 15 PSIG across either filter - Remove all screens.
indicates the need for filter change. - Visually inspect overhead seal oil tanks, degassing
- Bubble nitrogen through system at regular intervals. tanks, drainer modules, if required, wipe clean with
lint-free cloth.
Record.
- Replace all components. Clean filter cartridges (less
- Flush through all instrument connections. Record.
- Flush through all pressure control valve impulse lines. than 5 PSI pressure drop) can remain subject to owner
approval. If new cartridges are fitted, the cleanliness of
Record.
- Thermoshock the system by use of the lube oil the system must be rechecked.
coolers at regular intervals (varying oil temperature - Restore reservoir oil to normal operating level.

- Obtain oil analysis.
between 120 F e 180 F). Record.
- Rap exposed piping with a fibre hammer at one hour
intervals. Record.
3.5 When the 100-mesh screens meet criteria in paragraph System identification___________________________________________
3.9/3.10 reinstate all instrumentation, orifices, pipe
Oil type_______________ Req’d circulation temp___________________
spools, etc. Arrange entire system in normal, complete
configuration with all controls, alarms, etc., in operation. Minimum duration req’d________________________________________

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