Page 20 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

List of Best Practices
B.P. 7.39: Use a ‘false reference’ gas signal for oil bushing seals
B.P. 7.8: Use pump suction strainers’ delta P transmitters to in high pressure services
alarm on high differential B.P. 7.40: Design overhead seal oil tanks with easy access
B.P. 7.9: Consider pump motor drives if the electrical system inspection flanges
is reliable B.P. 7.41: Only use seal oil drainers with external level control
B.P. 7.10: Best practices for main pump steam turbine driver valves
B.P. 7.11: Always test oil system relief valves on the oil B.P. 7.42: Install needle valve bypasses around drainer vent
console and not on PSV test rig orifices
B.P. 7.12: Install sight glasses in drains of positive B.P. 7.43: Use a dedicated vacuum degasser unit installed in
displacement pump relief valves the degassing tank
B.P. 7.13: Use oil actuated control valve and a sensing line
anti-pulsation device (if required)
B.P. 7.14: Install dual SS accumulators in critical service lube Chapter 8 Pump Mechanical Seal
oil systems Flush Best Practices
B.P. 7.15: Use SS oil coolers and filters in critical service oil
systems B.P. 8.1: Confirm the actual seal operating conditions on the
B.P. 7.16: Shop test for the oil console should duplicate field data sheet
conditions as much as possible B.P. 8.2: Pre-select mechanical seal and flush system design
B.P. 7.17: Require triple modular redundant transmitters for during the pre-FEED phase
all shutdown functions B.P. 8.3: A cartridge seal design should be used whenever
B.P. 7.18: Utilize the ‘Best Practice’ oil flush program to possible
drastically reduce flush time B.P. 8.4: All cartridge seals should be statically pressure tested
B.P. 7.19: Monitor oil filter change time to determine oil prior to installation
reservoir and rundown tank cleaning B.P. 8.5: Use pressurized dual seals whenever possible in
B.P. 7.20: Continuously vent the non-operating cooler and hydrocarbon applications
filter in cold ambient applications B.P. 8.6: Require a pressure gage be installed in the seal
B.P. 7.21: Critical machinery should have only one trip signal chamber or the flush line
for each component B.P. 8.7: Perform checks of all associated seal systems during
B.P. 7.22: PM control valves and pulsation suppression devices mechanical seal replacement
at every turnaround B.P. 8.8: Use medium pressure steam in seal jackets for hot
B.P. 7.23: Monitor oil flash point in combined lube/seal pumps (above 300 C)

systems B.P. 8.9: Avoid the use of flush line strainers and cyclone
B.P. 7.24: Replace mature plant switches with TMR separators in dirty services
transmitters in all trip circuits B.P. 8.10: Quench system design and monitoring guidelines
B.P. 7.25: Monitor control valve position in all oil systems to B.P. 8.11: Mechanical seal monitoring best practices for
determine component wear optimum mechanical seal MTBFs:
B.P. 7.26: Check system transient functions immediately B.P. 8.12: All flush plan 52s (un-pressurized tandem seals)
before turnarounds must be continuously vented
B.P. 7.27: Perform an oil system site audit if the subject
B.P. 8.13: Installation best practice guidelines for maximum
system is a ‘bad actor’ pump mechanical seal MTBFs
B.P. 7.28: Define maximum oil velocities to prevent excessive
piping pressure drops
B.P. 7.29: Label oil system piping with color tape to facilitate Chapter 9 Dry Gas Seal Best Practices
understanding and troubleshooting
B.P. 7.30: Initial critical equipment shaft vibration alarm B.P. 9.1: End users must be proactive in the project phase for
settings should be as low as possible optimum reliability
B.P. 7.31: Check control oil accumulators every 3 months B.P. 9.2: Use double seals whenever possible for less complex
B.P. 7.32: Use steam turbine multiple solenoid control oil seal systems
dump valves in parallel and series B.P. 9.3: Always monitor both primary and secondary tandem
B.P. 7.33: Exercise all critical service tip valves once a seal conditions
month B.P. 9.4: Use abradeable type separation seals for maximum
B.P. 7.34: Use flow-through bushing oil seals when surface reliability
speeds exceed 300 ft/min B.P. 9.5: Ensure that N2 dew points are above -30 Cto

B.P. 7.35: Avoid the use of dynamic gas side bushing seals optimize carbon life
B.P. 7.36: Use clean sweet buffer gas whenever process gas B.P. 9.6: Use an external source of clean, dry seal gas, if
is sour available, for maximum reliability
B.P. 7.37: Require separate drains with sight glass and T1 in B.P. 9.7: Seal gas must be maintained at a higher pressure than
each atmospheric seal drain line reference gas or flare pressure
B.P. 7.38: Require that the seal oil system is on before gas is B.P. 9.8: Ensure that the low point drain area in secondary
introduced to the compressor case vent is monitored and drained

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