Page 572 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

The Post-Shipment Phase: Installation, Pre-Commissioning, Commissioning and Start-up Best Practices Best Practice 1 0.7
3.4 The following schedule shall be used for flushing: 3.8 Owner’s quality control representative will monitor all
- Add 100-mesh screen with 60-mesh back-up screens operations for compliance and verify all records, test
at oil reservoir and degassing tank if applicable as parameters and acceptance criteria on a surveillance
stated in paragraph 2.5 and flush through total basis. Final screen particle count will be verified and
system at 15 minute intervals until screens are recorded by quality control.
reasonably clean. Monitor closely the return lines on 3.9 The oil system acceptance criteria which shall be the
a continuous basis to ensure system is not backing up basis for witness approval parameters for contractor and/
with oil. or owner shall be as follows: Screen contamination shall
- Flush through total system at intervals of one hour be within the particle count limits according to the size of
until screens are reasonably clean. pipe; it will be determined as follows:
- Flush total system, alternating through systems 20 non-metallic particles on pipe 2.5 to 5 cm (1 to 2 in)
section until screens are clean. Supply lines shall be 50 non-metallic particles on pipe 5 to 10 cm (2 to 4 in)
alternated to ensure a greater than 150 percent oil 3.10 Particles shall not be metallic and shall display random
flow is maintained at all times. distribution on the screen.
- Add 100-mesh screens with 60-mesh back-up 3.11 The acceptance of the system shall be after installation/
screens to lube and seal oil inlet lines to all inspection 100-mesh cloth covered screens, then
equipment. Also add 100/60-mesh screens to circulating the lube oil an additional four hours and re-
overhead and seal oil tanks, reference lines and inspecting the screens. The final four hours’ flush should
coupling guard feed lines (if furnished). be with valves open allowing full flow through the
- Repeat ‘flush total systems’ above. system at operating temperature. Final acceptance
- Alternate flushing through each filter/cooler section, requires an oil analysis to determine metal content,
control valves and their bypasses, overhead tanks, viscosity and water content.
seal oil traps and reference gas lines. Record 3.12 Following acceptance the system shall be restored by
Note: A differential pressure of 100 kPa (15 psig) the owner for normal operation including the following
across either filter indicates the need for filter actions:
change. - Remove all screens
- Bubble nitrogen through system at regular intervals. - Visually inspect overhead seal oil tanks, degassing
Record tanks, drainer modules, if required, wipe clean with
- Flush through all instrument connections. Record lint-free cloth.
- Flush through all pressure control valve impulse - Replace all components. Clean filter cartridges (less
lines. Record than 34.5 kPa [5 psi] pressure drop) can remain
- Thermoshock the system by use of the lube oil subject to owner approval. If new cartridges are
coolers at regular intervals (varying oil temperature fitted, the cleanliness of the system must be
between 50 C e 82 C [120 F e 180 F]). Record rechecked.

- Rap exposed piping with a fibre hammer at one hour - Restore reservoir oil to normal operating level.
intervals. Record - Obtain oil analysis.
3.5 When the 100-mesh screens meet criteria in paragraph
3.9/3.10 reinstate all instrumentation, orifices, pipe
System identification__________________________________________
spools, etc. Arrange entire system in normal, complete
configuration with all controls, alarms, etc., in
Oil type __________________Req’d circulation temp ______________
operation.
3.6 Add 100-mesh white cloth (backed with 60-mesh Minimum duration req’d _______________________________________
screen) to all lube and seal oil supply points on
equipment bearings, seals and control oil inlets. Flush Pre-flush checklist Owner Vendor
until the criteria as stated in paragraph 3.9/3.10 is
achieved, but for a minimum period of 24 hours. 1. System configuration per reference ___________ ___________
Note: During final flush, alternate flushing through each drawings.
2. Old oil has been removed and reservoir/ ___________ ___________
filter/cooler section, control valves and their bypasses.
filter housing wiped clean.
3.7 Whenever practical, circulation shall be continued from 3. Filters and screens installed for flushing. ___________ ___________
the time of start-up until completion on a 24 hour per 4. All required instrumentation calibrated. ___________ ___________
day basis. Any irregularities shall be immediately 5. Lube/seal oil filled to capacity. ___________ ___________
reported to the vendor representatives and the 6. Bearing housings ready to accept flow. ___________ ___________
applicable owner representative as designated, which 7. Initial oil temperature reached. ___________ ___________
will be posted on the accessory skid control panel. 8. Approval to initiate oil flush. ___________ ___________

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