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Once a per month or 2 depending on your Main air compresser (MAC), its important to replace your 1st stage suction valve and 2nd Delivery valve / suction valve.
especially prior to arrvial port, you wouldnt want you MAC to give problems during manuvering.One grave mistake is not noticing the difference between the 2nd stage suction and 2nd stage delivery valves.
Time to time, take your MAC performance.
1)Log down the Time which MAC auto start to fill up your air bottle
2)Time when bottle is filled and MAC autostop
3)Time when the MAC auto start again.From the Time logged above, find out How long does your MAC takes to fill up the bottle & How long does it takes for air to be consumed for your MAC to start. ( shorter time indicates Air leakage somewhere )
You could monitor Air consumption by day also, Typical ship 3-4hours runnning hour / day.
I have experienced excessive air leakage from the control air from ME exhaust valve. Control air which controls the valve closing in the exhaust valve air cylinder.
Tanabe Air compressor, When MAC started, Smoke came out of the crankcasee indicating Blowpass.
initial troubleshootings
1) piston ring brokenChanged all the piston rings and inspection of liner. All okay.
& it turns out there is a broken oring on the piston pin on tanabe MAC, which not everyone knew of or change during major overhaul.
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