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Jay87T

03-25-2005 09:44:21

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Forgot to explain why, I want to replace the 3/4 copper pipe from my compressor pump to the storage tank. the 3/4 pipe is flared at both ends of the pipe with a coupling to screw it down, I cannot find a flare tool that will flare 3/4 inch copper. was just wondering if I can buy a connection joint screw it into the pump and tank and just solder the copper pipe to it.

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Weirsdale George

03-25-2005 13:26:34

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Re: reason in reply to Jay87T, 03-25-2005 09:44:21

My compressor has copper tubing with compression fittings.

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Jay87T

03-25-2005 14:14:51

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Re: reason in reply to Weirsdale George, 03-25-2005 13:26:34

do they make 3/4 compression fittings?

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Scott Green

03-25-2005 16:31:16

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Re: reason in reply to Jay87T, 03-25-2005 14:14:51

Yes they do have 3/4" compression fittings.

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Jay87T

03-25-2005 16:48:39

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Re: reason in reply to Scott Green, 03-25-2005 16:31:16

Home depot sell them?

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Weirsdale George

03-25-2005 15:14:36

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Re: reason in reply to Jay87T, 03-25-2005 14:14:51

Don't know. My tubing was 1/2". Unless you have a very large capacity compressor, 3/4" seems awfully large.

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MAC,IL

03-25-2005 11:10:50

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Re: reason in reply to Jay87T, 03-25-2005 09:44:21

When I worked for a water dept we flared 3/4 all the time. Do you know anyone who works for your city water dept???

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Glenn F.

03-25-2005 11:01:54

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Re: reason in reply to Jay87T, 03-25-2005 09:44:21

I don't remember the size of mine, but on my two stage Quincy I removed the flaired copper and installed a hydraulic hose. No problem. Glenn

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Rod (NH)

03-25-2005 10:14:14

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Re: reason in reply to Jay87T, 03-25-2005 09:44:21

Hi Jay,

It depends on the temperature and the type of solder. Here's a chart of rated pressures with different temperatures and solders. Be patient, it's a slow loader. The problem you have is high temperatures coming off the compressor. Perhaps a silver brazed joint would be enough but I don't know. A typical solder joint certainly would not be enough. That's why those joints between compressor and tank are always (as far as I know) mechanical type joints. For example, a single stage compressor operating at 135 psig has about a 10:1 compression ratio and a theoretical discharge temperature of about 450 deg F.

Rod

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JL Sargent

03-25-2005 10:00:11

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Re: reason in reply to Jay87T, 03-25-2005 09:44:21

Well, Roger P. would probably have a fit but Ill tell you what I did with your problem. Took the 3/4 flare pipe and threw it in the garbage. Went with 3/4" soldered copper pipe from compressor to tank about 5yrs ago. Max pressure in system is 125psi. Not one problem.

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Jay87T

03-25-2005 10:01:47

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Re: reason in reply to JL Sargent, 03-25-2005 10:00:11

my compressor goes up to 175psi, wonder if it would hold up to that?

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Rod (NH)

03-25-2005 11:15:36

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Re: reason in reply to Jay87T, 03-25-2005 10:01:47

Since you are going to 175psig, you are likely to have a two stage machine with some intercooling. That would put you with significantly lower discharge temperatures. You probably would be OK with 95/5 tin/lead solder. I certainly would not use 50/50.

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JL Sargent

03-25-2005 10:45:58

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Re: reason in reply to Jay87T, 03-25-2005 10:01:47

My compressor will go up to 500psi. My tools are all 100psi. I use a max 125psi on this compressor. It costs $$ to keep 175psi handy for a reason I dont need.

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dr.sportster

03-25-2005 10:08:17

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Re: reason in reply to Jay87T, 03-25-2005 10:01:47

Jay,Relax the pipefitters didnt even get home from work yet.

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