If a compressor with forced lubrication has an oil pressure gauge reading 90 psi and the crankcase pressure is 65 psi, what is the net oil pressure to the bearings?

To determine the net oil pressure to the bearings, we need to consider both the oil pressure provided by the compressor's lubrication system and the crankcase pressure. The net oil pressure can be calculated by subtracting the crankcase pressure from the oil pressure reading.

In this scenario, the oil pressure gauge indicates 90 psi, which represents the pressure of the oil being supplied to the bearings. The crankcase pressure is measured at 65 psi, indicating the resistance against the oil flow created by the crankcase pressure.

To find the net oil pressure to the bearings, the calculation is as follows:

Net oil pressure = Oil pressure - Crankcase pressure

Net oil pressure = 90 psi - 65 psi

Net oil pressure = 25 psi

Thus, the net oil pressure to the bearings is 25 psi. This value is critical because it helps ensure that the bearing surfaces are adequately lubricated under operational conditions, maintaining proper compressor function and longevity.