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post #1 of 30 (permalink) Old 01-02-2010, 04:00 AM Thread Starter
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Default A fair swap all round

I've known for some time that my small 2HP compressor was becoming too small as I added to my air operated tools. I suddenly, a few days ago had a flash of genius, In our business we had a nice big one which I of course left in the business when I retired and gave the business to our son. After eventually closing the business when it became cheaper to buy a new TV or video recorder, he of course took the compressor home and it has been used only to occasionally inflate tyres (notice the correct spelling!). Well I suggested that we make a swap and sonny Jim jumped at the idea because he was finding the big one very heavy to wheel around so we are both now happy. After bringing it home yesterday I gave it a good clean up, topped up the oil and removed 4 1/4 litres of brown "water", the consistency being like tomato soup.
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post #2 of 30 (permalink) Old 01-02-2010, 05:42 AM
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Harry,

That's one mighty fine looking compressor you got there... though even your old one beats my little $20 "craigslist special"!

Just an idea.. You might want to disconnect the compressor lines from the tank and flush as much of the sludge out as possible, fully drain and reconnect on day here. Just like mud, the sludge holds the moisture (and acids that form with the rust) against the wall of the tank instead of letting it run to the bottom to be drained. This is the reason they run "scraping pigs" through produced water (water with a trace of crude oil) in Alaska's North Slope pipelines and it is BP's failure to do this that significantly contributed to some of their pipeline ruptures.

Just a thought!

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post #3 of 30 (permalink) Old 01-02-2010, 05:55 AM
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Thanks for the reminde Jim, I have not done mine for too many years to be sure. I understand that the tank should be drained every year--I sure have not done that!!!



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Harry,

That's one mighty fine looking compressor you got there... though even your old one beats my little $20 "craigslist special"!

Just an idea.. You might want to disconnect the compressor lines from the tank and flush as much of the sludge out as possible, fully drain and reconnect on day here. Just like mud, the sludge holds the moisture (and acids that form with the rust) against the wall of the tank instead of letting it run to the bottom to be drained. This is the reason they run "scraping pigs" through produced water (water with a trace of crude oil) in Alaska's North Slope pipelines and it is BP's failure to do this that significantly contributed to some of their pipeline ruptures.

Just a thought!

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post #4 of 30 (permalink) Old 01-02-2010, 06:35 AM Thread Starter
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Thanks for that Jim, one of these days I'll do it. In the business we drained the tank whenever water started to come through with the air.
Jerry, would you believe that both compressors, which appear to have come from the same factory in Italy, have labels saying to check the oil daily, also drain the tank of condensate, I wonder if anyone actually does this.

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post #5 of 30 (permalink) Old 01-02-2010, 07:52 AM
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A few weeks back I went into a job site on a complaint that the building was not heating up properly. I spoke with the mgr. and asked for a lil history on the place. He informed me that they have been replacing EMS components left and right for a couple of years and in two years time, they have replaced a small compressor 3 times. Walking back to the equipment room his frustration was evident with what this has been costing him. Not to mention the comfort level of the building. Opened up the control cabinet and quickly found several pneumatic actuators had failed. AGAIN. At 300.00 a pop, he wasn't a happy camper. We went over to the compressor and everything appeared to be ok. I bled it off to check operation and when she fired up, she came up to pressure in a heartbeat...Even for a small compressor this was kinda waayyyyyyyyyyy to quick. To makea long story short here, the compressor did NOT have a petcock to bleed off water/moisture/condensate in the tank. Thereby reducing volume dramically. Pressure would build ok, but with only half a tank, the thing was running constantly. pushing more and more of the gunk into the system....there was so much of it, it was bypassing the inline filters, getting into the actuators and causing them to fail regulary.

I guess the point i'm trying to make is, bleeding off air tanks is a biggie and should be done at regular intervels, beit residential, commercial or industrial... Even for the price of an automatic bleeder its money well spent...
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post #6 of 30 (permalink) Old 01-02-2010, 09:02 AM
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Harry;
Don't forget to check the pressure in the tires.

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post #7 of 30 (permalink) Old 01-02-2010, 09:07 AM Thread Starter
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I appreciate that story Bill and will give priority to Jim's suggestion of cleaning out the system and then bleeding the tank regularly. I only just noticed the brown stain on the floor from when I emptied the tank yesterday, I hadn't realised that some had splashed out of the container.

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post #8 of 30 (permalink) Old 01-02-2010, 11:30 AM
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Hi Harry

" I wonder if anyone actually does this."

I do it every 2 weeks, I took one of the BOSS's cookie sheets put on a brass fitting and a hose and I drain it into a plastic milk bottle..about 1/2 gal. of water every 2 weeks..

========

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Thanks for that Jim, one of these days I'll do it. In the business we drained the tank whenever water started to come through with the air.
Jerry, would you believe that both compressors, which appear to have come from the same factory in Italy, have labels saying to check the oil daily, also drain the tank of condensate, I wonder if anyone actually does this.


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post #9 of 30 (permalink) Old 01-02-2010, 01:19 PM
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In the framing trade it gets done every day. Constant run comps are the worst when it comes to condensate. The tanks heat up much more than point of use comps, which pressure up when the low trigger pressure is hit and shut off when max pressure is met.

Smaller double tanks aren't as bad as single 20 gal tanks. And the winter is the worst time of the year for it, it freezes in the lines, hoses and gun safeties.

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post #10 of 30 (permalink) Old 01-02-2010, 11:48 PM
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Be warned, some compressors recommend the tank be drained daily, others about a week or two.

Depending on the use, I'll drain my tank about every 2-3 weeks. I'll let the air bleed off slowly, then leave the petcock valve on the bottom open for a few days. You'd be surprised at what you see still "dripping" out of the tank.

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