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Old 11-11-2011, 08:27 AM   #11
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Quote:
Originally Posted by swedishcharm21 View Post
We all know that 1.41 or 1.414 is the formula for figuring your 45 offset.

BUT!....let's say your working with 3/4" copper pipe. You got to offset 45 degrees. Lets say a 10 inch offset. So, we come up with 14.14.

Nobody on here ever gives the numbers you must deduct for the fitting.

Back to the question. We are working with 3/4 pipe. We got a 10" offset. Our travel piece is 14.14

What will the actual length be when you deduct the fittings?

I am amazed at how many know the offset formula, but still physically hold the pipe up to the 45's and have to make another cut because they do not know how to deduct for the fitting(s)
Really? you can't measure the fitting allowance yourself? Really?

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Old 11-11-2011, 08:40 AM   #12
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Quote:
Originally Posted by swedishcharm21 View Post
Stillaround....tell that to an apprentice who needs to know this when they perform a copper pratical at the journeyman exam......they would fail if they 'eyeballed". Eyeballing it does not cut it.

Since you are into eyeballing.........tell us all how you deduct your fitting for a 13.5" offset with 3 " PVC Sch40. Actual length of travel piece, minus fittings. And what exactly did you deduct for those fittings.

You are helping all the greenhorns out by the way....Thanks
I'm thinking back on the times I used an offset formula when running pipe....wait a minute, it will come to me...o yea, measure from the center of the fitting.....

If its a 1/16th bend do we multiply by 2?
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Old 11-11-2011, 10:43 AM   #13
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In Tx you have to use the formula on your jm test. Once on a 3/4 blk steel offset and then on a 2" ci rolling off set. You don't pipe it u just do the math and write down the answer
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Old 11-11-2011, 10:52 AM   #14
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Quote:
Originally Posted by stillaround
3/4 copper should be eyeballed....stop wastin time and get the pipe run, its getting close to lunch.......perspective please
I agree.. But I can still respect the fact that he was wantin to know how to format the formula.

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Old 11-11-2011, 12:20 PM   #15
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And everyone wonders why the trade is getting dumber and dumber

Let's just forget about the whole thing and run pex and csst. Then we only need to be within the nearest foot or so.

For Jimminy Crist's sakes. subtract the distance from the center of the fitting to the fitting make in and double it if there's two 45's

It's like being in the freekin 4th grade all over again. You apprentices damn well better get your heads wrapped around the math. I will not tolerate close enough nor will I tolerate cutting gunners and then wasting pipe as you fine tune your stupidity. A few years back I started showing up on the site just after my plumbers left and harvesting all the little bits and pieces. Over a short period of time those bits and pieces add up to a sizable amount of money and all because of laziness or stupidity. The difference between a Master and an apprentice and some journeymen is the ability to PROBLEM SOLVE
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Old 11-11-2011, 12:36 PM   #16
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Is the OP actually asking us how to deduct a fitting allowance off a calculation? Good Lord! Switch to drywalling!
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Old 11-11-2011, 12:43 PM   #17
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For me the math isn't the hard part, it's getting the fitting take off correct. When measuring the take off for threaded fittings, especially large ones (above 2"), I've found that factory threads on fittings can vary as far as how deep they will thread. Also, there's variation on factory settings on die heads, which can also vary with wear.
Case in point: we had to put an offset into a 2-1/2" black gas line last Sunday during a shut down using 4 90's and two felt and right nipples and couplings with the cut measurements phoned in and made on a shop machine 25 miles away.
As anyone who has ever used left and right fittings knows, the margin for error when lining up l&r couplings is very little. Fortunately, we got it right on the first try. The trick, as anyone who has done this knows, is to measure the actual make up of the first threaded fitting coming off the machine and making all subsequent cuts and take offs are exactly the same depth.
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Old 11-11-2011, 02:01 PM   #18
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I thought this site was for all levels of experience. The op was in my opinion trying to better his skills and knowledge, and I think that is a good thing. I think I have fitting take off charts I will try to find them and post
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Old 11-11-2011, 02:35 PM   #19
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The op knows the answer. He is seeing who all on here can do the math and when to do the tak off. Read his second post
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Old 11-11-2011, 05:10 PM   #20
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Unless I have to be PERFECT,I just take off for one 90 on a 45 set,seems everyone knows the take off for the 90's.
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