What makes air compressor second stage discharge pressure be abnormally high?
This could happen because of:
Leakage of compressed air on inlet side of stage 3 cylinder due to failure of stage 3 inlet/ discharge valve or reduced volume efficiency of stage 3 cylinder due to the reversed flow of compressed air on discharge side into the cylinder. Check the stage 3 inlet/discharge valve in the same way as for the stage 2 inlet/discharge valve, and replace it with spare or repair.
insufficient cooling capacity of stage 2 capacity of stage 2 intercooler check the cooling water system, and if the flow rate is OK. Clean the cooler.
Faulty pressure gauge. Replace or repair the pressure gauge.
