High pressure at stage 1 of the 3-stage compression reciprocating compressor
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Recently, one of the compressors in our factory has been experiencing high pressure at the first stage: within just a minute of startup, the pressure rises by 0.20 above the normal level, and when it reaches the interlock protection pressure of 0.25, the machine shuts down automatically. A few days ago, there was a problem with the gasket inside one of the inlet valves at the second stage; after replacing it, the machine operated normally for one night before shutting down due to overpressure. The piston rings at the second stage have been checked and replaced with new ones, and no abnormalities were found with the inlet valves at that stage as well. The interlock protection activates as soon as the machine is started under pressure. I hope experts can help analyze what’s going wrong
The current pressures after the compressor is started are 0.26 at stage 1, 0.38–0.40 at stage 2, and 0.95 at stage 3. The normal operating pressures are 0.20 at stage 1, 0.42 at stage 2, and 0.95 at stage 3
The main reasons for the high outlet pressure at the first stage of a 3-stage compressor are: 1. Problems with the inlet and outlet valves of the second stage (damaged or dirty valve discs, improperly installed or damaged sealing aluminum gaskets, etc.)； 2. There is a problem with the second-stage piston ring ； 3. Air leakage from the three-stage piston rings to the balance section ； 3. There is a problem with a section of the outlet valve or check valve ； 4. Blockage in an outlet cooler ； 5. Pressure gauge issues ；
Based on the current situation, if the pressure at level 1 is high while the pressure at level 2 is low, which area should be checked?
Check if there is a problem with the secondary intake valve.
It is also possible to check whether there is a problem with the spring of the primary exhaust valve.
There is a cooler; it was taken apart today and there was no sign of blockage
Check the primary exhaust valve to see if the material will crystallize
If no problems are found during the inspection of the secondary intake valve and piston rings, then check the secondary exhaust valve as well