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Most all manufacturers require you to use their filter and lubricant during warranty periods. This ensures that they are protected with products they designed with the specifications they feel are necessary to properly maintain their equipment.
High temperature is caused by restricted coolant flow. Coolant flow can be air, water and oil. In a lubricated rotary screw compressor check the air filter and oil filter for restrictions; most oil filters have a 1,000 hour life. Check your oil level; oil acts as a coolant and sealer in these compressors, low level equals elevated temperatures. Air cooled compressors have a radiator that needs to have full flow of air from the fan or there will not be enough heat transfer. Watercooled compressors may have a restriction in the water flow, or the water inlet temperature may be elevated. Most compressors are equipped with a thermal valve (much like a cars thermostat) that may be stuck and not sending enough of the oil through the cooler.
All air compressors will discharge oil into the air lines at varying amounts. A rotary screw compressor may have a scavenge line plugged or the separator element may need to be replaced. A reciprocating compressor may not be cycling properly for its design, or may need to have valve and or piston ring work done. To completely eliminate the oil carryover a coalescing filter will need to be installed in the air line.
The most common material used is black iron pipe, but galvanized iron pipe, copper and extruded aluminum are used as well. Extruded aluminum has been gaining in popularity; it is light weight and utilizes a push to lock fitting eliminating the need for pipe wrenches and is very quickly installed.
This varies greatly depending on the type of oil. If you are using petroleum oil in a rotary screw compressor you will need to change the lubricant every 500 to 1000 hours. If you are using a synthetic or partial synthetic you will have a range of 4,000 hours all the way up to 12,000 hours. Make sure you know what oil you are using, most lubricants are not compatible with each other.
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