The Doc
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| posted on 14/2/10 at 06:10 PM |
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Compressor Issues
I have an old Compair Compressor. When it gets to about 100 PSI the motor starts to struggle, then eventually if left the fuse blows.
Knackered motor, capacitors. Any ideas which is the more likely?
TA
Mike
Q: Who wants to live until they're 80?
A: Someone who's 79
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BenB
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| posted on 14/2/10 at 06:12 PM |
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I know this is a silly question but does it have enough oil in it? Getting hot and seizing when under pressure?????
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blakep82
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| posted on 14/2/10 at 06:12 PM |
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what pressure's it supposed to go to?
i thought 100psi was quite high, but can't remember what mine goes to.
if its supposed to go above 100psi, motor perhaps. if its supposed to stop at like 90 or something, pressure switch?
________________________
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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The Doc
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| posted on 14/2/10 at 06:19 PM |
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I will check the oil level.
The original pressure switch, which is adjustable starts at 120psi then upwards. Actually I replaced this with a new one which is 120-150 range. I
understand this is right for a large-ish compressor. This one has 125 litre tank
Q: Who wants to live until they're 80?
A: Someone who's 79
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jacko
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| posted on 14/2/10 at 06:20 PM |
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Has it just started doing this ?
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RAYLEE29
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| posted on 14/2/10 at 07:31 PM |
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hi, not sure if its relavent but my compressor sounded horrible the other day it was extra cold outside now its warmed up a little it sounds fine
first things to do would be check the oil and drain the water from the tank
also make sure your gauge is reading correctly
Ray
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martin1973
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| posted on 14/2/10 at 07:32 PM |
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one way valve between tank and pump.
mine does it
have you drained the tank lately?
martin
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The Doc
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| posted on 14/2/10 at 11:35 PM |
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Thanks guys
Jacko - for a while but has got worse
Raylee - how could water cause this sort of prob? (I'll drain it off again anyway)
Martin - have you inspected the one way valve, replaced it etc. Where is it usually located in the system and what should I be checking for?
Q: Who wants to live until they're 80?
A: Someone who's 79
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RAYLEE29
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| posted on 15/2/10 at 11:12 AM |
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just the first things to do with any compressor thats playing up
also if you had a lot of water in there the compressable air would be less volume
some people never drain and its surprising how much water can build up
Ray
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wilkingj
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| posted on 15/2/10 at 01:57 PM |
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quote:
Originally posted by RAYLEE29
also if you had a lot of water in there the compressable air would be less volume
some people never drain and its surprising how much water can build up
Ray
Also the water causes the inside of the tank to rust. Then after time it gets weak from the INSIDE, then it blows out.
Worst case is it busts the tank open showering the workshop with bits of shrapnel.
You should drain your air tanks of water on a regular basis.
Garages and the like have to have them tested for safety and insurance purposes.
They usually do this ultrasonically to detect thin patches (read this as rusting through from the inside).
Many of us are using old and second hand compressors. These are probably more likely to be rusted inside the tank.
So think safety and take care. Drain your tanks regularly.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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rusty nuts
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| posted on 15/2/10 at 08:49 PM |
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Garage compressors used to be tested by filling them with water under high pressure , don't know if things have changed.
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David Jenkins
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| posted on 15/2/10 at 10:06 PM |
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Same as model steam locomotive boilers - mine was tested every 2 years by filling it to the brim and pumping in more water until it gets to 1.5 x
working pressure.
The advantage of pressurising a tank with water is that the water is near-enough incompressible and therefore stores no energy - if there is a leak
the only thing that happens is a spray of water. On the other hand air can be compressed and any leak will result in catastrophic failure as the
air's stored energy is released. And don't ask about steam when it's at 90psi! 
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