3 replies to this topic

Hi,

I am working for a truck compressor manufacturing company. Our compressor faces a huge Oil carryover problem in the field.

I want to know what are all the possible causes that could be from the Compressor and from the Vehicle point of view.

I want to know this to perform the deeper analysis to minimize the effect of the problem

This is the Reciprocating compressor.

Thanks for sharing the same.

GVe

[Art Montemayor]

Gve:

There is nothing mysterious about oil carryover from the discharge of a reciprocating compressor. The answer is simply one of two issues – or a combination of the two:

• You are over-lubricating the cylinders;
• You do not have efficient discharge phase separation or a discharge knock out pot.

The above assumes your compressor has force-fed oil lubrication to the cylinders. I don’t know what a “truck compressor” is. I assume what you have is a truck-mounted air compressor that is driven by a take-off from the drive shaft. It could be splash lubricated, with trunk-type pistons. If that is the case, then the cylinder lubrication is done by empirical design on the crankcase and the “dipper” that is usually mounted on the connecting rods.

In any event, the same two basic elements above still hold.

Dear Art Montemayor,

Thanks for your reply.

This Compressor is fitted on the Engine and driven through gears. It is the forced lubricated so it doesn't need a splash on its connecting rod. The crankcase is designed in such a way the excess oil will be rerouted to the Engine crankcase by its gravitational force.

The answers given by you is absolutely correct from the compressor point of view. But some external factors from the Vehicle can affect the compressor such as choked Engine filter will lead to abnormal vaccum inside the compression chamber and that ends in more oil entering the chamber. I want to know the other possible causes that from the vehicle it can affect the compressor.

I dont know whether I have communicated correctly.

Thanks,

Gve

Dear Art Montemayor,

I dont understand about your second point explaining about the discharge knock out pot or discharge seperation. But I can assume that it can be an Air Dryer used in the Vehicle to seperate the oil and moisture from the compressed discharge air. Request you to kindly correct me if I am wrong.

Thanks,

Gve