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madman
04-08-2010, 07:30 AM
When doing runs of copper pipe using t fittings 45 degree elbows and 90 degree elbows. If you are trying to rep[produce a accurate length of runs inside a building is there a chart available for the Fitting allowances? I looked through the Google features and didnt find much of anything. I am doing some Pipe (copper 1/2 inch and 3/8 inch projects that have to be accurate and wanted to find a sort of fitting allowance chart. Also a chart for threaded Malleable crane fittings would be nice to have also. thanx

Circlip
04-08-2010, 08:55 AM
If you use a propriatary IdiotCad program(me), the lengths will be almost exact, BUT, that ain't no consellation when trying to shuffle STANDARD tubing lengths to suit.

Measure in straight lines and add 5% to the total.

Regards Ian.

PS. Make sure it's REAL Copper.

PTSideshow
04-08-2010, 09:03 AM
This might have what you are looking for (http://www.engineeringtoolbox.com/pipes-tubes-dimensions-t_16.html)
:D

oldtiffie
04-08-2010, 09:23 AM
Try these:
http://www.brasscopperfitting.com/plumbingfittings-copper_elbow.htm

http://www.brasscopperfitting.com/

http://www.google.com.au/#hl=en&source=hp&q=copper+fittings+plumbing&meta=&aq=1&aqi=g10&aql=&oq=copper+fi&gs_rfai=&fp=18a51b3ed23f0245

Assuming that these are correct for/in the USA, then they should be adequate.

If it were me, I'd buy a sample of each type of pipe and fitting being used on the project and make up my own set of tables.

Circlip
04-08-2010, 02:07 PM
Woa Tiff, vey ar Chinees Coppa flittins.

ADGO_Racing
04-08-2010, 02:26 PM
Woa Tiff, vey ar Chinees Coppa flittins.


Is there anything else???

Allan Waterfall
04-08-2010, 02:34 PM
Not really sure why you need fitting allowances inside a building,to estimate things to that degree of accuracy you need to know that the building measurements are exactly to plan which is unlikely.

I'm assuming you'll probably be measuring the pipe on site with a tape measure and use a pencil to mark the cut.
All the plumbing I ever did with copper pipe involved cutting it to size on site.

Usual way is to measure the length of runs from wall to wall and see how many lengths of pipe you need to accommodate that total.

Allan

oldtiffie
04-08-2010, 05:44 PM
Originally Posted by Circlip
Woa Tiff, vey ar Chinees Coppa flittins.


Is there anything else???

I did say:

Assuming that these are correct for/in the USA, then they should be adequate.

My reason was that irrespective of source and quality issues etc. that if the drawings are for items as used in the USA that provided that the pipe distances between centres or intersections points are known then use the drawings to get the pipe lengths - on a theoretical basis.

I also said:

If it were me, I'd buy a sample of each type of pipe and fitting being used on the project and make up my own set of tables.
That will satisfy those that either don't trust drawings and/or need a "hands on" solution.

One or at most two "bends" (90* and 45*) and straight line reducer sleeve samples for each pipe size will soon let anyone sort out the required lengths of pipes.

Limy Sami
04-08-2010, 06:47 PM
Best of luck, the measurements you seek will vary from manufacturer to manufacturer.

Best of luck X 2 for Crane fitting allowances, in the UK they couldn't make a consistent fitting to save their life,.......... if memory serves they had 3 patterns for 1/2" ells - but according to Cranes they were all the same.

ADGO_Racing
04-09-2010, 01:11 AM
Be sure to take a magnet with you when you buy the copper pipe...:p (If you are wondering why, read Evans thread about the major scam).:eek:

Smokedaddy
04-09-2010, 01:45 AM
madman,

If you are talking about "take-offs" of the fittings, then you can either measure them yourself or use this .PDF file.

http://www.nibco.com/assets/coppercat.pdf

To get the take off of a fitting, it is measured from where the copper tube bottoms out in the fitting, to the center line of the fitting. The take-offs are subtracted from the center to center measurement needed, then you cut the tube (called end to end ... E-E ie.).

-SD:

madman
04-09-2010, 06:37 AM
I entered fitting allowances on google not much really came up.? I was finding variances on fittings that i measured. This informatiion was for a special project im doing with pipe and tube, for college. As a Home shop machinist old habits die hard. As i try to make everything accurate as I can. I think it may not matter so much for tube and pipe?

Circlip
04-09-2010, 09:07 AM
Don't forget Madman, in the machining world there is invariably a tolerance on the drawings, same applies but moreso in the utility services, usually to the nearest foot or yard.:D

Regards Ian.

Smokedaddy
04-10-2010, 11:54 AM
I entered fitting allowances on google not much really came up.? I was finding variances on fittings that i measured. This informatiion was for a special project im doing with pipe and tube, for college. As a Home shop machinist old habits die hard. As i try to make everything accurate as I can. I think it may not matter so much for tube and pipe?

What sort of project are you doing for school? As far as accuracy goes, it all depends on what sort of project you are doing. In the biopharmaceutical and semiconductor world the high purity stainless steel tube we use is fabricated within 1/16 tolerances center to center of the overall fabrication. On the other hand, the high purity plastics (PVDF etc.) are within 3/16 overall. Of course if you are a plumber and doing the plumbing (drain waste and vent) then everything changes. They just get it close.

http://www.pbase.com/smokedaddy/image/120524813

http://www.pbase.com/smokedaddy/image/120524814

-SD: