Reasons for the different numbers of piston rings in the two compression stages of a reciprocating compressor
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The first-stage compression piston has one guide ring and one piston ring, while the second-stage compression piston has one guide ring and four piston rings – is this due to the pressure difference?
It is because the pressure levels vary; the higher the pressure, the more piston rings are required
Function of piston rings: To seal the high-pressure gas inside the cylinder and prevent it from leaking through the gap between the cylinder and the piston! It is easy to understand that the greater the number of piston rings, the higher the pressure at that stage.
Take the square root of the pressure difference; rounding it gives the number of piston rings
The higher the pressure, the greater the number of piston rings required.
The higher the pressure, the greater the potential leakage, and the more piston rings are required.