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Old 03-24-2014, 08:20 PM   #1
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How to pipe fit


I just moved a toilet so I had to reattach another PVC drain to the main house sewer line. While doing that I noticed another drain was leaking, so it ended up being a big job that took several hours. I could not make it all fit, so I used a rubber boot to make the final joint in the main line.

I noticed plumbing books discuss specific projects like reinstalling a toilet, but not much is mentioned about the overall strategy in getting drains to the main line, and then in how to connect them into the main line. Can any of you recommend some reading material? What is the order in connecting PVC pipes? How do you premeasure to get the angles right? I fit them all together without glue, but it took a long time cutting and adjusting pipes.

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Old 03-24-2014, 08:32 PM   #2
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How to pipe fit


One trouble with dry fitting PVC---the glue allows the pipe to go further inthan when dry fit----so --best to glue as you go--

As to a book? Mine are all old---let's see if someone knows a current issue---

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Old 03-24-2014, 08:53 PM   #3
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How to pipe fit


Most of your questions are not easily answered. Apprentice plumbers rely on their journeyman to teach the ins and outs of the trade.
Next to diy chatroom, youtube is probably the next choice. Ask a specific question here to start and we'll get you the answer
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Old 03-24-2014, 09:50 PM   #4
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How to pipe fit


to calculate a 45 degree offset multiply center to center x 1.41 then subtract the fittings for a 45 degree offset... this is the basic idea.. there are some other factors to consider sometimes.. but you really have to understand some basic rule of plumbing 1 st and you have to see from hands on to really get the gist of it ....
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Old 03-25-2014, 03:04 AM   #5
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How to pipe fit


When installing pipe try to avoid working yourself into a corner by being between 2 fixed points that cannot be moved to allow a glue joint.
Other main points of plumbers.

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Old 03-25-2014, 06:59 AM   #6
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How to pipe fit


There aren't any books because no one want's you to know how to do it.

But when DIY'ers dry fit they need to keep a felt tip pen handy to mark the distance inserted and the rotation angle of 90° and 45° ells.
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Old 03-25-2014, 07:02 AM   #7
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When installing pipe try to avoid working yourself into a corner by being between 2 fixed points that cannot be moved to allow a glue joint.
Other main points of plumbers.

Shi! flows down hill.
Payday is Friday
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Years of experience is the true teacher of a trade.
and don't bite your fingernails
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Old 03-25-2014, 07:35 AM   #8
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How to pipe fit


piping is a game of angles, geometry. i know guys in the trade that still have a problem getting it right.
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Old 03-25-2014, 09:30 AM   #9
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It's hard for diy'ers but get in the habit of measuring from fixed points of your material.
I like center to center of pipes when doing offsets. Then you subtract your fittings before making the cut.
In some cases, hub to hub is used- then add the fitting make up
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Old 03-25-2014, 03:44 PM   #10
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How to pipe fit


Thank you for all the suggestions so far. Please keep them coming. Because I did all this work in the middle of the main house sewer line I ended up having to join it all with a Fernco boot to attach two cut sides of the main line. Is that how it is usually done or am I missing a trick?
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Old 03-25-2014, 05:36 PM   #11
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How to pipe fit


Modern plumbing materials are often a lot more forgiving than the older materials. For example, cast iron pipe is very hard to fit perfectly, takes many years of practice, because it is heavy to work with, very stiff, and the joints cannot be easily moved to allow for fitting. On the other hand, plastic is a bit flexible, and if you are making a long run, it is often possible to move one end of the run to allow fitting an intermediate piece. PEX is even more flexible, so easy to work with compared to copper. If you work with plastic, life is a bit easier than using galvanized, cast iron, or copper.
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Old 03-25-2014, 10:56 PM   #12
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How to pipe fit


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Originally Posted by crescere View Post
Thank you for all the suggestions so far. Please keep them coming. Because I did all this work in the middle of the main house sewer line I ended up having to join it all with a Fernco boot to attach two cut sides of the main line. Is that how it is usually done or am I missing a trick?
Not a big fan of those rubber couplings
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Old 03-26-2014, 07:47 AM   #13
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Not a big fan of those rubber couplings
You gonna get in trouble for givin away those licenced plumer sectets.
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Old 03-26-2014, 10:59 AM   #14
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How to pipe fit


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Not a big fan of those rubber couplings
That's why within the dwelling they are required to have a shield. That's installation error, not fault in the product.

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