What are the causes of rod tearing and fracture in reciprocating compressors?
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After the compressor maintenance was completed, the accident occurred around 18 hours into the trial operation; it happened at around 3 p.m. Our preliminary analysis of the causes is as follows: First, the operator failed to conduct timely inspections and did not detect the abnormality in time to shut down the machine urgently； II. Insufficient oil supply to the big end bearings of the compressor rod leads to excessive wear of these bearings; when the rod reaches its extreme position, it collides with the crankcase, causing damage. It’s unclear whether these two reasons for the accident are reasonable, or whether they constitute the root causes of the incident.
The main cause of rod tearing and fracture in reciprocating compressors is a change in stroke. In addition to the possible reasons analyzed by the original poster, inhaling liquid droplets can lead to a reduction in stroke length, causing the connecting rod to bend or even break.
It’s also possible that the connecting rod bolt loosened first
There is liquid in the compressed medium, resulting in liquid hammer.
Mid-term repair: replaced the connecting rod bearings and main shaft bearings, as well as the piston rod and piston rings
What was the temperature of the large-head tile when the car was first started?
In addition to the two reasons you mentioned, this situation should also be considered from the following aspects: 1, whether there is liquid slugging; 2, whether the clearance of the piston in the cylinder is appropriate; 3, whether the clearance of the big-end bearing is appropriate. For reference only
By the way, how is the area above the piston ring, up to the piston top and the cylinder liner, lubricated? There are no oil nozzles there; if oil splashes, the oil ring scrapes off the oil.
No issues during the 8 hours of testing during the day, but problems arose at night!
Lubrication in the cylinder is supplied forcibly via an oil injector