The complete air compressor body was broken due to pressurized crankcase. Fortunately no one was injured by this incident. However repairs are estimated beyond economical and new compressor unit installed. Possible scenario of trouble: During operation, the compressor crankcase turned in pressurized condition due to following reasons – 1) Air leaking from second stage (High pressure side), where the piston gudgeon pin is located protected with seal ring and disc arrangements. 2) Hairline cracks or pit holes developed on piston crown, possibly due to cylinder lubrication insufficient or failure. Pressurized air can be discharged into Crankcase chamber. 3) Seized or broken piston rings and scratched liners allowed high pressure air to leak in the crankcase. 4) Inadequate crankcase breathing due to restricted or clogged breather caps disabled the venting systems. Admission of the high pressure air into crankcase can lead to interrupt the lubrication and develop hot spots. Air compressor at this stage will be vulnerable to develop explosive atmosphere. If the crankcase breathing or venting system is not adequate or restricted the explosion may occurre. Countermeasures/ conclusion Daily
Whenever pressurizing of crankcase noticed At every overhaul PMS |