Heavy Duty Balanced Opposed Compressors

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FOR MODELS: JG AND JGA SECTION 6 - TECHNICAL ASSISTANCE 5. Check for excessive ring groove wear in pistons. Every 6 Years or 48,000 Hours (plus Daily/Monthly/6 Months/1/2/4 Years 1. Replace main and connecting rod bearing shells and bushings. 2. Replace lubricator distribution blocks. 3. Replace crosshead bushings. 4. Replace DNFT. Trouble Shooting Minor problems can be expected during the routine operation of an Ariel compressor. These troubles are most often traced to liquid, dirt, improper adjustment or to operating personnel being unfamiliar with Ariel compressors. Difficulties of this type can usually be corrected by cleaning, proper adjustment, elimination of an adverse condition, replacement of a relatively minor part or proper training of the operating personnel. Major problems can usually be traced to long periods of operation with unsuitable lubrication, careless operation, lack of routine maintenance or the use of the compressor for purposes for which it was not intended. Recording of the interstage pressures and temperatures on multistage units is valuable because any variation, when operating at a given load point, indicates trouble in one of the stages. Normally, if the interstage pressure drops the trouble is in the lower pressure cylinder. If it rises, the problem is normally in the higher pressure cylinder. While it would be impossible to compile a complete list of every possible problem, listed below are some of the more common ones with their possible causes. Problem Possible Causes Low Oil Pressure Oil pump failure. Oil foaming from counterweights striking oil surface (oil level too high). Cold oil. Dirty oil filter. Interior frame oil leaks. Excessive leakage at bearings. Improper low oil pressure switch setting. Oil pump relief valve set too low. Defective pressure gauge. Plugged oil sump strainer. Improper end clearance in oil pump. PAGE 6 - 4 11/01
FOR MODELS: JG AND JGA SECTION 6 - TECHNICAL ASSISTANCE Problem Possible Causes Noise in Cylinder Excessive Packing Leakage Loose piston. Piston hitting cylinder head end head or crank end head. Loose crosshead balance nut. Broken or leaking valve(s). Worn or broken piston rings or wear bands. Valve improperly seated or damaged seat gasket. Liquids in cylinder. Worn packing rings. Improper lube oil and or insufficient lube rate. Dirt in packing. Packing rings assembled incorrectly. Improper ring side or end gap clearance. Plugged packing vent system. Scored, tapered or out of round piston rod. Excessive piston rod run-out. Packing not seated or properly run in. Packing Over Heating Lubrication failure. Improper lube oil and/or insufficient lube rate. Worn packing rings. Dirt in packing. Improper ring side or end gap clearance. Scored, tapered or out of round piston rod. Excessive piston rod runout. Excessive Carbon on Valves Excessive lube oil. Improper lube oil. Oil carry-over from inlet system or previous stage. Broken or leaking valves causing high temperature. Excessive temperature due to high pressure ratio across cylinders. Relief Valve Popping Faulty relief valve. Leaking suction valves or rings on next higher stage. Obstruction, bind or valve closed in discharge line. High Discharge Temperature Frame Knocks Drive End of Crankshaft Oil Leak Excessive ratio across cylinder due to leaking inlet valves or rings on next higher stage. Fouled intercooler piping. Leaking discharge valves or piston rings. High inlet temperature. Improper lube oil and or lube rate. Loose crosshead pin or pin caps. Loose or worn main, crankpin or crosshead bearings. Low oil pressure. Cold oil. Incorrect oil. Knock is actually from cylinder end. Low fluid level in damper. Clogged vent or vent piping. Excessive cylinder packing leakage. 11/01 PAGE 6 - 5
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Heavy Duty Balanced Opposed Compressors

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