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Old July 5th, 2014, 03:21 PM
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I am about to build a manifold out of schedule 40 pvc and i will be tapping pipe threads. is there anything i should be aware of that is different than tapping steel?
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Old July 5th, 2014, 03:58 PM
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Go slow and easy Rich, back tap up frequently to clean threads. Getting the tap to start straight is the hardest . We used to use any thicker grade oil as a lubricant , messy but it helped.

What is the manifold for? What size PVC and sch 80 has thicker walls and taps a little bit better , I have some if you need it? Thinking Xak can buy lunch again. :)
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Old July 5th, 2014, 04:45 PM
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4" x 2ft or close to that length Bob thanks for the reply, and yes i think xak still owes us 1?
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Old July 5th, 2014, 09:54 PM
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At work we always go 1 sized samller on the drill bit for PVC versus steel. It is only a 32nd or 64th smaller but helps get better threads. If going into the side wall of sch. 40 you have to be careful as there is not much to get threads on. Sch. 80 is better but if you can tap into the socket portion of a fitting it gives you a lot more meat to tap into.
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Old July 5th, 2014, 10:13 PM
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depending on the size of hole you will be making it will work fine of will have leaks.

I tried tapping 1" NPT in the side of a 4" pvc pipe manifold that I made for a Bender releaser and found that there just wasn't enough material there to get enough of the threaded adapter threaded in to get a good leak free seal.
I ended up gluing the threaded fitting into the manifold to make it leak free,

Now if you are only going something like 1/4" 1/2" NPT then I think you will be ok with having enough to make it leak free.

Also I found that it is a little tough to get the tap started and then staying going straight. There were a few of my manifolds that the fittings went off at a slight angle.
Any don't run the tap in to far right away or you will run out of threads on the fitting before it makes a good seal.
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Old July 6th, 2014, 07:48 AM
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On my lapierre single vertical the threads are not straight. I was always having leaks until I gooped pvc cement on the nylon threads and screwed them in.
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Old July 6th, 2014, 07:36 PM
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I needed to do a little dirt bike split in the gas tank repair and used shoe glue worked great stayed a little pliable and gas didn't effect it........
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Old July 6th, 2014, 08:09 PM
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ok , thanks everyone for your input. im going to go with schedule 80
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