RE: [PipingDesign] inch dia in welding

From: <>
Date: Fri Aug 06 2004 - 06:29:00 EDT

Addenda: May refer my earlier mail.

-----Original Message-----
From: Javeed, Iqbal
Sent: Monday, April 14, 2003 11:35 AM
Subject: RE: [PipingDesign] Inch Dia

In construction projects, both Inch Dia & Inch Metre are generally considered as units for measurement of quantum of piping job (mainly for welding/ Erection of piping/ hydrotest measurements). Former being denoted by ID of (phi)" or " and inch metre by IM respectively; can be understood as below:
Consider an 8 inch NB pipe of length say 100 metres. If there are 5 joints of this pipe to be welded, the quantum of this welding job is calculated as Pipe Dia (in inches) x No. of joints, i.e, 40 and denoted as 40 Inch dia (ID).
In terms of IM, we say the quantum of job as Pipe Dia (in inches) x No. of Metres, i.e, 800 and denoted as 800 Inch Metre (IM). Once again, ID is generally taken as unit of measurement (of quantum of job) for Welding, Radiography, DP test etc and are used as units for payment purposes as well.
IM is considered normally to define the quantum of Piping Erection job, Insulation (besides Metre cube) and its payment terms. Hope this clarifies;

  -----Original Message-----
From: Rakesh Patil [] Sent: Friday, August 06, 2004 8:34 AM
Subject: Re: [PipingDesign] inch dia in welding

Dear raga,

Inch dia in welding is nothing but the multiplication of size of joint x no of joints (of that size) which you need to weld during fabrication. Consider a Piping Spool , Say it has a pipe of 4" (12 m long), with flange on one end and elbow on another. You are providing a branch connection of 2" on it.

Welding inchdia in it is:

Total joints of 4" in it = 1(pipe with flange) + 1(pipe with elbow) + 1 (it is optional - if a pipe purchased is of 6m length then you need to weld pipe to pipe to gain 12m length spool, but if pipe purchased is of 12m length then it is not required).

so inch dia = 4*3 = 12.

Now for branch connection of 2" on mother pipe of 4", you need to provide a weldolet, which will add one joint of 2" size. so inchdia = 2*1 = 2

So Total inchdia involved in fabrication of that spool = 12 + 2 = 14inchdia.

I hope, it will clear ur doubt.


"raga_prasath" <> 08/05/2004 09:25 AM
Please respond to


[PipingDesign] inch dia in welding


i am new in this group, i want to know what is inch dia in welding and how

calculate this

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