Piping Material Spec Break

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14 years 7 months ago - 14 years 7 months ago #7624 by mangesh ghanekar
Piping Material Spec Break was created by mangesh ghanekar
How do you show material specification break when pressure changes and material changes?(show diagram please)


Regards,
Mangesh.

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14 years 7 months ago - 14 years 7 months ago #5273 by 2ndMoment
Replied by 2ndMoment on topic Re: Piping Material Spec Break
Mangesh,

Ultimately, if your company's (departmental standard) or project's piping design criteria, or client requirements (contractual) do not stipulate what you should use, then how you represent a specification break is up to you! However, whatever you use, you should bear two considerations:

1. The symbol should be included along with all other P&ID symbology in your published piping documentation and guidelines, which will be inevtiably read by designers, process engineers, piping team members, site contractors and the plant operations team.

2. The symbol should not be easily confused with any other symbol on your P&ID's like flange joints, orifices, valves or blinds.

The conventional way is as per the attached document which is typical of codes of practice like PIP. For this question I will assume you're referring to piping material specification change and not necessarily lagging or tracing.

To digress: the decision on "what" is, as can be seen above, the easy part. The element very often overlooked is "why" and "how". If you are wishing to adjust the material specification for pressure, it should be born in mind that those dimensions within a piping material spec relating to pressure are the intrinsic strength of the material and the wall thickness i.e. how strong and how much. These in turn affect internal diameters and flange ratings - the physical properties. In should be checked: that when joining different piping line classes, whether by flange, coupling or buttweld, that apart from the process compatibility of the adjacent pipes, they're physically compatible too.


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