air compressor

what type of compressor?

what PSI needed?

what are you using it for?

It is a reciprocating air compressor. It operates at about 6ksc.And i am using it as instrument air.

Reciprocating, 6 ksc and instrumentation devices.

Turn it off when the system is up to pressure?

First check and verify the efficiency of the compressor, make any repairs needed to get it to the rated cfm. Ive got that calculation somewhere, let me know if you need it and I'll dig it up.

Be certain you have a good quality, proper functioning check valve on the discharge side. (preferably of the lift type, spring assisted) It should be close to the compressor, but far enough so the heat generated does not damage the valve if it has a soft material seat.

Keep your inlet filters clean and dry.

Adjust your cut in/out so the unit does not constantly cycle un-necessarily.

Repair any existing leaks in the system piping.

Thank u sir....it will be very useful to me if you give out the calculations

The compressor must feed a receiver or tank of a known volume. (stamped tag)
To conduct the test, close the valve that isolates the receiver from the plant's distribution system and turn off the compressor. Vent the receiver down to approximately 30 psi and turn the compressor back on. Study the pressure gauge on the receiver and use the stopwatch to time how long it takes for the pressure to build from 50 to 100 psi. Use the following formula to calculate the flow (scfm) of your compressor:
0.45 V_R t = O_C
where:
V_R is receiver volume, gal
t is time, minutes
O_C is Compressor output, scfm
Dividing the results of the test by the manufacturer's flow specification will indicate what percentage of the original capacity the compressor is operating at.
As an example, lets say a 712-hp compressor has a factory rating of 28 scfm and an 80-gal receiver. It takes 2 min and 6 sec to build the pressure from 50 to 100 psi. Then:
0.45 80 2.1 = 17.1 scfm, and
17.1 28 = 0.61
So the compressor is operating at only 61% of its original capacity. This indicates that the compressor is operating at a severely diminished capacity. This information should be carefully considered before replacing the unit.

Here you go!

Sir, the information you gave will be of much use to me....But to my knowledge i have heard that the compressor rating will be like this....7 kg/cm^2 at 200m^3/min. Usually the free air delivered will be the suction volume. But in your example you have cited about the discharge volume which gives me a confusion. Could you please clarify on that.

Hey. I have a problem with my air compressor tank. It's not getting filled up properly. Can anyone help me ?