GE H301 Series Operating Manual page 128

118 | Chapter 9: Troubleshooting
Situation
Inadequate compressor output
flow
Crankshaft drive end seal oil leak
Gas safety relief valve popping
Potential common causes
• Unit recycle vent or scrubber dump valve open or leaking
• Compressor speed lower than rating
• Compressor suction pressure lower than rating
• Cylinder head end VVCP unloader improperly adjusted
• Suction pressure gauge reading higher than actual
• Incorrectly calibrated gas flow meter
• Damaged or incorrectly installed orifice plate in gas flow
meter
• Leaking valve around gas flow meter
• Liquid drop out between stages of compression
• Downstream line obstruction or isolation valve closed
• Damaged cylinder valves
• Damaged piston rings
• Incorrect compressor valve use, valve not properly tailored
for application
• Metered gas flow inaccurate or not counting upstream
deductions for engine start/fuel gas, dehydration unit, and
other auxiliary equipment
• Clogged top cover breather
• Back pressure from excessive cylinder packing leak
• Excessive seal wear due to incorrectly adjusted front cover
• Excessive seal wear due to drive coupling misalignment
• Faulty or improperly adjusted pressure safety valve (PSV)
• Back pressure from leaking suction valves or piston rings
of higher stage cylinder downstream
• Downstream line obstruction or isolation valve closed
• Discharge line check valve restriction – sticking or
damaged
• Gas cooler tubing restriction – fouled or exceeds flow
capacity