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116 | Chapter 9: Troubleshooting
Situation
Crankcase oil level high/low
High oil filter differential pressure
"No-flow" shutdown, cylinder lube
Valve breakage or wear abnormal
Carbon coated valves
Packing over heating
Potential common causes
• Cold oil / insufficient head pressure
• Oil makeup system isolation valve closed or strainer
plugged
• Oil makeup system out of adjustment or leaking
• Filter media plugged
• Cold weather / high oil viscosity
• Oil contaminated with water (condensed during shutdown)
• Oil pressure gauge(s) reading improperly
• Lube line blockage or crushed tubing, causing rupture disk
to blow-out
• Rupture disk cap torque excessive, scored disk lowers
rupture pressure setting
• Incorrect rupture disk or fitting for application
• Inadequate lube oil supply to pump
• Faulty high-pressure oil pump feeding distribution blocks
• Distribution block failure
• DNFT failure
• Oil injection point check valve blockage or failure
• Incorrect DNFT Magnetic base
• Liquid carryover
• Improper valve tailoring – lift, material, springing, assembly
• Solid abrasive debris entering cylinder with gas stream
• Excessive oil supply
• Off design operating condition
• Gas composition change
• Gas system resonant pulsation
• Incorrect center bolt torque
• Excessive cylinder lubricating oil
• Improper cylinder lube oil selection
• Oil carryover from inlet scrubber or from previous stage
• High temperatures from leaking or broken valves
• Excessive temperatures due to high compression ratio
across cylinder
• Excessive temperatures due to high inlet gas temperature
to cylinder
• Inadequate lube oil supply rate, break-in versus normal
rates
• Lubrication supply failure
• Improper lube oil selection and associated lube rate
• Worn packing rings
• Contaminants (liquid or solid) affecting packing rings
• Improper packing ring clearance; side or end
• Contaminants (liquid or solid) affecting packing rings
• Piston rod wear – scored, tapered or out of round
• Excessive piston rod run-out
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Table of Contents
Troubleshooting
