I have a 88 cc tank and a compressor to fill it. I want to fill the tank to 4500 for going to the range. My compressor will fill it to 4500psi ok but when I check it with a dead head the tank reads 4000 psi. I don’t know what is going on. I need help to figure out what is going on. Thanks for your help.
Need help with my tank
- Thread starter muskin
- Start date
If you're checking the pressure a while after a fill, it's likely that the newly compressed air has cooled from the 'heated' air that it was filled with from the compressor/booster.
Very common.
mike
Very common.
mike
Upvote 0
It could be two things , first , most gauges do not agree with each other , also when you compress air it heats and the pressure reads higher than when cool. The best way to fill a tank , especially from empty , is to do it in stages , letting the tank cool and the pressure to drop . If filling an empty tank , I always do it in several stages while letting the tank and compressor cool.
Upvote 0
Your post says an 88cc tank. If you’re losing any air while connecting any fitting I think it could easily drop 500psi. But if you meant 88CF then there’s a gauge problem somewhere, or as stated, pressure drop from cooling down of air.
Upvote 0
What compressor and do you use an auto stop? Auto stops that rely on the guage needle get a memory your compressor thinks it's at 4500 but the bourdon tube has ben sprung and gained a memory. It will both read incorrectly and stop prematurely.
Hey at least they don't fail high and break parts and hurt people.
Upvote 0
Fill to 4200, let it "settle" or cool for a couple hours, top off again. If you're going on TANK gauge reading those aren't terribly accurate.
Upvote 0
I can’t get it above 4000. It says 4600 when I fill it. My compressor is a cs4- i. Did it both ways, used the compressor stop and ran it past 4500 hit the switch. Did not work, checked it and it was 4000. Thanks for the reply.
Upvote 0
While the compressor is running, check to see that the tank gauge and the compressor gauge readings agree.
If the two gauges show substantially different readings, always fill to the highest reading gauge to avoid safety issues.
For example, if the compressor gauge reads 4500 psi but the tank gauge reads 4000 psi, rely on the compressor gauge. However, if the tank gauge shows 4500 psi but the compressor gauge shows 4000 psi, rely on the tank gauge.
Dead-head test:
Do not use auto shut off.
Fill until either the compressor gauge or the tank gauge reads 4500 psi. Record the tank gauge reading.
Close the tank valve with the compressor running.
Immediately after closing the tank valve, open the bleed screw on your CS4-i.
Then stop the compressor.
Immediately dead-head the tank. Be sure to fully open the tank valve.
The tank gauge should read be the same as recorded above.
JackHughs
Upvote 0
Long time habit, couple years probably.
Triple check the gauges,
I don't even use that one on the tank anymore, and on the compressor is just for rough checking the compressors pistons conditions. The one in the middle is fairly large 60mm OD.
Triple check the gauges,
I don't even use that one on the tank anymore, and on the compressor is just for rough checking the compressors pistons conditions. The one in the middle is fairly large 60mm OD.
Upvote 0