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Old 06-18-2006, 09:32 AM
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ARGH!!!!! What am I doing wrong?

I finished plumbing all my black/galvanized pipe for my compressor (or so I thought)

I did a pressure test the other day, only to find one air leak at the second last elbow. After removing some pipe, clean the dope off and re do it.

Re-test by filling the lines again, To have about 4 air leaks at my first drop.

I went out a bought a diferent brand of pipe dope, and most of the time only after a second application of dope did I fix the leak. I was told to put a wrap of teflon tape then apply the dope.

I got to the point of buying a cap, so once I re-doped the threads I capped the end and filled with air again. This method seams very time consuming, What is a good way to do this?
Or should I continue to add a peice, cap and pressure test?

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Old 06-18-2006, 11:29 AM
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I've used pink T tape without dope.Just tighten the snot out of each connection and had zero leaks without checking.
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Old 06-18-2006, 12:38 PM
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Quote:
Originally Posted by 123pugsy
I've used pink T tape without dope.Just tighten the snot out of each connection and had zero leaks without checking.
I have tightened the snot at the joints but I have sometimes run into a problem when I need an elbow or tee to point in a certain direction...

123pugsy,
I see your fromn Tarana, I'm just outside in Etobi.
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Old 06-18-2006, 01:20 PM
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Just tighten,do not loosen to the direction you gotta go.If its that tight and you can't turn anymore ,take it off and use more tape.

You are using good size pipe wrenches,right?

I'm actually in Markham.
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Old 06-18-2006, 02:31 PM
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Quote:
Originally Posted by 123pugsy
You are using good size pipe wrenches,right?

I'm actually in Markham.
All I got to tighten is a couple of vicegrips. If the direction of the threads are right then I thread in a length of pipe and use that for leverage.
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Old 06-18-2006, 03:44 PM
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You need a pipe wrench and some teflon tape. Its probably not getting tightened enough with the vise-grips, and it needs to be very tight for high-pressure lines. And Ive found that teflon tape is much better than pipe dope for air lines. Hope this helps
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Old 06-18-2006, 04:56 PM
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Wind the tape around the pipe thread 4 to 5 times, clockwise and fasten it real good.
Don,t turn back, then a leak will start.
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Old 06-18-2006, 05:32 PM
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ThanX folks...

Looks like I've got to hit my neighbour and see if he has a pipe wrench.
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Old 06-18-2006, 05:50 PM
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air lines

I just finished piping my garage with air lines. I used a pipe dope called "RectorSeal" and is available at Home Depot. Had no leaks. Be sure to tighten everything really good and use pipe wrenches.
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Old 06-18-2006, 06:22 PM
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Quote:
Originally Posted by 58Chev
All I got to tighten is a couple of vicegrips. If the direction of the threads are right then I thread in a length of pipe and use that for leverage.
There's the problem! You can't get it tight enough with vise-grips or using the pipe itself. Get a couple of pipe wrenches. Get a 14" and an 18". One to hold and one to tighten.
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Old 06-18-2006, 09:19 PM
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and they work great to hold the pinion yoke when crushing the collar when setting up gears!

Brendan
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Old 06-18-2006, 11:09 PM
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I would do like suggested and get a couple pipe wrenches.
I know the pie dope we use at work for gas piping is not a sealer, it is used to make it easier to thread the pipe. The sealer is the teflon tape. There is pipe dope that has teflon in it but we have found better results by using the dope with no teflon and then wrapping it with the tape. We test gas lines at 70 psi but that is for 2lb gas line. I don't know about air lines. One other thing is, it is better to use American black pipe or galvy than the pipe that comes from china, also use ward fittings(made in America). We have found the ones from china sometime have pits in them that leak or the threads on the pipe. I don't know how you check for leaks but I just use a spray bottle with soap and water.
I hope this helps a bit.
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Old 06-18-2006, 11:46 PM
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I've used Permatex #2 on pipe threads for years with zero problems. Their liquid (#3 or 300) also works well, but won't hold up to high air pressure as well as #2.
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Old 06-19-2006, 12:06 AM
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Use galvanized pipe, coat with rectorseal#5 soft set, and make sure you are not over threading the pipe. Its a tapered thread, and you should just clear the last tooth on your die. Over threading causes the pipe to bottom out in the fitting and the tapers won't seal. Pipe wrenches are good, but with good American or British fittings all I ever use are a good pair of channel locks, but this requires a good hand grip strength, like plumbers have from doing it all day. Harbor Freight has some good pipe wrenches, just oil them if they get wet, they will rust. Make sure you de-burr your pipe if you are threading yourself and beware of some hourly kid at home depot not using oil when threading pipe, will ruin the cut. Soap and water sprayed on joints will find your leaks easily. Have fun!!!
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Old 06-19-2006, 09:40 AM
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Smoke and Problem Solvers offered the best advice yet, get GOOD pipe and fittings. It is getting harder and harder to find good American made fittings but most of the imported ones are just plain JUNK! If you are having to really crunch the pipe, even using dope, then your pipe and fittings are crap imports and should not be used for compressor piping. I have seen this stuff not only leak but some of the cast fittings are so crudely made that because of casting flash and just poor quality castings the ID will be restricted causing flow problems. Really one should use the proper tools, pipe wrenches in this case, but if you have good quality pipe and fittings Vise Grips should suffice.

Smoke/Problem Solvers, there has been a lot of discussion on compressor plumbing here but this is one important area that I have not seen addressed, thanks for bringing it up.

Jimfulco, I plumbed air systems for years and Permatex is all I used It is much better at sealing a poor fit under high pressure than either dope or tape.
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