problem in sabroe screw compressor 151

Gents .
before few days we faced problem in our screw sabroe compressor 151 that compressor run few seconds and stop with out alarm . after monitoring we found the capacity not increase that mean still zero also the oil pressure after stop still gives 1.2 bar . but if shutoff the suction valve . the oil pressure gives zero bar .
I suspect the suction check valve not working Correctly , Although I checked that valve physical and we don't found any thing trouble .
can you please help us to solve that issue .
thank you for all .

yacoub

It seems strange, perhaps the pressure gauge.

Josef.

thanks josef
please note that I changed the oil pressure sensors and gives same value

But you have to find out the essence of the trace compressor.
Suction transmitter.

Josef.

please note that we have standby compressor and I don't found any difference in suction pressure reading that mean gives same value between the standby comp. and the comp. that has problem


yacoub

There are not many options.
You have checked the suction valve, I assume the entire suction pipe line is OK.
Bad seting-bad transmitter or clogged suction filter, but the suction filter is a low probability.
You wrote that the compressor shutdown and no warning alert. Unisab will not leave the compressor without warning, only when setpoint.

Josef.

Have you tried running in manual to eliminate control signals.
Check loose electrical connections l
check relays.
Interlocks like flow switches or high level protection, timers.
Starter run signal.

Hi,

not sure, but all what you describe point to some external stop signal or missing start signal from your system ...

you should have alarm notice if you have an alarm situation ... otherwise is normal stop .. check your set points as suggested by Josef ...

Can be very simple problem and sometimes we .. can't see the wood for the trees ...


Best regards, Josip

Thank to all
I checked all thing you told to me . but I don't found any thing trouble . the sitting don't changed , don't have electrical losses .
but after run the compressor in manual mode , the suction pressure decrease , knowing that capacity zero .also the current high gives 300 A at zero capacity .
Is the problem will be in the capacity slide ?

yacoub

Yacoub
Does this machine have capacity indicator under a box on side of machine?
It has a pin that moves in & out pushing a potentiometer.
Check it against reading on screen.
Unloaded pin in unloaded, out loaded.
See where is, move it see if it changes reading or just see where it is first.

thank you ranger1 and all friends
the problem solved . we found the screw on the slid piston as picture below damaged and free I don't know the reason why that happened . we replacement that screw and the compressor back run normally with good reading .
thank you all for support me .



Attachment 15193Attachment 15194Attachment 15195

The loose screw has the essence, but OK.
Question, 2 pieces of washer is back or in the separator?

Please next time give 100% information, find out in 3 days that you 300 Amper?:mad:

Josef.

sorry josef :(
thanks

And washer?

I don't find the washers and installed the slid without washer .
is their washers very important ?:confused:

Attachment 15196

Position 97 part 534A0932H01 Washer Set (Spherical)

Maintain stability and length. There are two pushing ones against each other. Also, if you have not threaded Loctite thread, the problem will be repeated. The pad can also be in the compressor and that's a big problem.

Dear Josef
please what can I doing to not repeat that problem and to save the compressor ?:confused:

It is important to find 2 pieces of washer.
If you do not find the compressor, they'll be in the separator, okay. Buy new washers and new bolt. Installing new bolt and new washers will be a headache !!!

thanks Josef
I'll request the washers and the screw


Attachment 15197

Screw 534A0572H01
washers set spherical 534A0931H01
Attachment 15199
Attachment 15198

about the root cause to that problem . any explain ?

Explanation simple, the factory has not encountered an error yet, but if someone has done overhaul it can be.

the compressor reached to 29000 running hour and no person did overhauling for that (not open )

The highest time to open and repair.
Yacoub, never encountered a problem like you. Yes I know the weakness of the compressor.
He has processed dozens of such compressors.