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sachin_rastogi_in
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Join Date: Jul 2008
Location: India
Posts: 111

Spec break in process P&ID

09/29/2008 3:44 AM

How can one know the point of spec break in process P&ID ?

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Anonymous Poster
#1

Re: Material

09/29/2008 8:35 AM

A spec break is required anytime there is a change in material or in the pipe specification.

If it is a matter of an existing spec break in the field that is not indicated on the drawing, the pipe would need to be inspected to determine it's material and specification.
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healybj8
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Join Date: Sep 2007
Location: Raleigh, NC
Posts: 148
Good Answers: 8
#2

Re: Material

09/29/2008 9:18 AM

Usually the drawing is marked where the spec break occurrs. Typically there are two arrows pointing at each other with the pipe spec written on either side just above the line in question. The break occurrs at a valve and/or flange typically.
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Anonymous Poster
#3
In reply to #2

Re: Material

09/30/2008 8:20 AM

If spec break occurs in flanges then how the PCD of flanges will suit?

For ex:If spec break is occur between #150 & #300 rating,the PCD of flange is different for both the rating.So defenetly its impossible to bolting.Can u clarify it.
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Anonymous Poster
#4
In reply to #3

Re: Material

11/17/2008 4:16 AM

The spec break will occur on the piping not the flange. For example:

line of spec A--flange--valve--flange--line of spec A--spec break--line of spec B.

This way the flanges of the valve will be the same. Both at higher spec.
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Anonymous Poster
#5
In reply to #2

Re: Material

03/09/2009 12:50 AM

Thanks boss. Ur reply helped me alot.
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