ML 315-13 EWNA

Common issues

• Oil carryover into the air system from a worn or clogged oil separator element
• High discharge temperature trips from fouled aftercooler or oil cooler fins in salt air
• Excessive vibration from worn coupling elements or drive motor misalignment
• Intake filter clogging that reduces capacity and raises specific power consumption
• Minimum pressure or non-return valve leakage causing slow pressure build-up or backflow
• Moisture carryover from a fouled or undersized downstream air/moisture separator
• Screw element bearing wear leading to increased noise and reduced volumetric efficiency

Inspection checklist

• Check oil level and condition, colour, viscosity and water content, at the sight glass
• Inspect and clean or replace the air intake filter element
• Check oil separator element differential pressure against the maker's limit
• Inspect cooler fins for salt deposits and fouling; clean as needed
• Check drive coupling for wear, alignment and correct elastomer element condition
• Test the high discharge temperature and high pressure trips
• Check the minimum pressure valve and non-return valve for correct operation
• Verify the safety relief valve is within test date and lifts at its set pressure
• Inspect the control panel fault history and running hours between starts
• Check the condensate drain or moisture separator for correct automatic operation

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Oil separator element
• Air intake filter element
• Compressor lubricating oil, maker-approved grade
• Drive coupling elastomer or element set
• Minimum pressure valve repair kit
• Safety relief valve
• Oil filter element

Safety

• Stored pressure energy in the receiver and downstream piping - fully depressurise and lock out before opening the air circuit
• Hot surfaces on the cooler and discharge piping during and after running
• Rotating drive coupling and screw element - lock out and tag out the electrical supply before opening covers
• Risk of receiver over-pressurisation if the safety relief valve is bypassed or out of test

Class survey

Class surveys typically check that safety relief valves on the compressor and air receiver are within test date, that automatic start/stop and safety trip functions operate correctly, and that the associated air receiver has a valid examination and pressure test certificate.

Estimated lifetime: Screw airend major overhaul is typically in the order of 40,000-60,000 running hours depending on duty and maintenance quality - confirm against TMC's service documentation