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smcsaminda
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Join Date: Jan 2014
Posts: 1

Minimum Distance Between Pipe Fittings

01/17/2014 5:06 AM

Hi all,

i'm very new for globalspec.

I want to know a code or standard which describe good practices or standard for distance between pipe fittings in a pipe system. Because very short distances affects for high pressure drops.

please help me
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Anonymous Poster #1
#1

Re: Minimum distance between pipe fittings

01/17/2014 7:33 AM

Your question has been asked many, many times before on this and other forums.

The answer is:

- It depends a bit on the type of pipe fitting. The minimum distance is different for socket welded vs. butt welded fittings.

- There are no piping code minimum distances contained in the ASME B31.1/B31.3 codes.

- Common sense and good welding practice requires that you do not overlap the heat affected zones for welded pipe. ( I am assuming you are dealing with welded pipe... but you have yet to state the type of fitting you prefer)

- There are practical space limitations on having enough room to physically make a weld. This, of course, will be affected by the diameter of the piping system.

- Leading engineering consulting firms commonly specify a number such as ~ 3 inches minimum..... but you can make up your own guideline.

What does "Because very short distances affects for high pressure drops." mean in English ?
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lyn
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Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#2

Re: Minimum Distance Between Pipe Fittings

01/17/2014 12:06 PM

"Because very short distances affects for high pressure drops." maybe, if the fittings are 90/45° elbows, sweeps, Tee fittings, bell or concentric reducers that would cause turbulence, but not so much so in straight couplings and unions.

A general rule of thumb is 5-10 pipe diameters between any fittings that may induce turbulence.

Of course a good piping designer will take care to control the velocity, and turbulence in his pipe designs.

This site: AioFlo may be a big help to the fledgling piping designer.

Assuming that we understand what you are really asking.
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brich
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Join Date: Oct 2009
Location: sometimes Wales,UK.. was Libya, now Oman!
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#3

Re: Minimum Distance Between Pipe Fittings

01/18/2014 7:48 AM

have you tried searching?

Let me rephrase that... TRY searching on Google!!

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CaptMoosie
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Hobbies - DIY Welding - New Member Hobbies - Target Shooting - New Member Engineering Fields - Civil Engineering - New Member United States - Member - New Member

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#4

Re: Minimum Distance Between Pipe Fittings

01/18/2014 1:29 PM

If you have bolted flanges, make sure that you have enough distance between the pipe flanges to enable you to swing a socket wrench or pipe wretch.

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James Stewart
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#5

Re: Minimum Distance Between Pipe Fittings

01/22/2014 9:54 AM

You could go to engineer's toolbox, and look at their finite element model for pipe and fittings. You at least must research your system to see if you are really pushing limits of flow for the pipe size in mind. Obviously, for highest efficiency (lowest head losses), less finite elements in the entire system is the best answer.

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