Compressor piston rings
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Friends who are using nitrogen and hydrogen compressors, please introduce the material and service life of the piston ring in the high-pressure section, and what affects the service life during assembly.
The piston ring material is made of cast iron and filled with PTFE. The service life is generally replaced once a year. The piston ring assembly is very simple and should not affect the service life. I think the main factors that are most likely to affect the service life of piston rings are:: Poor lubrication, poor temperament, piston ring material or the cylinder itself (e.g.: Diameter out of tolerance, ellipse, etc.).
Cast iron rings (H223) are commonly used in the fourth and fifth stages. The service life is two years. Of course, it is related to the wear of the cylinder. There are also PTFE-filled ones, which have been used for six years (6M compressor). The six-stage 223 ring is better to be made of powder metallurgy. The cycle is one year, because the fourth and sixth stages are on the same side. The 6M model uses PTFE-filled rings, and the cycle is only one year. It has to be replaced because of the wear of the cylinder.
I just forgot to mention that when assembling the piston ring, you must check the side clearance of the piston ring and the settlement amount. If the side gap is too large, the piston ring will easily break. If the settlement amount is too large, it will not have a sealing effect. If the settlement amount is too small, the cylinder will be strained. This is very important!
The material has a greater impact. The other is lubricating oil and oil. Generally, the high-pressure section needs to be replaced as quickly as half a year to a year. Even if the low-pressure section is broken, it can still be used for a period of time until it can be repaired. The impact is not big.
Not entirely correct. The consequences of a broken piston ring will be serious.: 1. Gas leakage in the cylinder will cause damage to the inlet valve, high temperature, coking, etc. ； 2. The wear of the piston support will increase and the cylinder will be roughened. ； 3. Piston ring grooves will be whipped by wear, causing piston premiums ； 4. A broken piston ring will cause abnormal noise in the cylinder, leading to misjudgment by the operator. ； 5. In order to reduce losses, it is better to eliminate them as early as possible, otherwise it may cause more and more work, which is not conducive to reducing the workload. ；
The piston ring material is filled with PTFE, and the service life is generally one year. The piston ring assembly is very simple and should not affect the service life. Axial clearance: 0.25--0.40mm, radial clearance: 0.30, piston ring opening clearance (1) 2.5--4.5 (2) 3.0 The main factors that affect the service life of the piston ring are:: Poor lubrication, poor temperament, piston ring material or the cylinder itself (e.g.: Diameter out of tolerance, ellipse, etc.). The main piston ring material and gas composition are not good, and the operation is also very important.
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