How should actual oil pressure be calculated on a compressor with a pressurized oiling system?

Calculating actual oil pressure in a compressor with a pressurized oiling system involves understanding the relationship between the oil pressure and the suction pressure. The proper method is to subtract the suction pressure from the oil pressure gauge reading.

In a pressurized oiling system, the oil pressure is influenced by the suction pressure within the compressor. The oil pressure gauge typically reflects the pressure in the oil system, but what ultimately matters for the performance and safety of the compressor is the pressure differential that ensures oil is effectively circulated and lubricating the components. By subtracting the suction pressure from the oil pressure reading, you obtain the net oil pressure acting on the compressor components. This provides a more accurate representation of how the oil is performing under operational conditions, ensuring it is sufficient to lubricate and protect the internal parts of the compressor while accounting for the vacuum effect of the suction side.

Understanding this calculation is crucial for maintaining compressor efficiency and reliability, as it affects lubrication and, consequently, the lifespan of the compressor.