Dear all

My query is regarding scope of the design of a temporary closure (blind flange) for hydrotest.

It is a temporary part and is after the first weld joint from vessel boundary in a nozzle and away from 2 t.

I feel that one can design it by good engineering practice and even by sec VIII Div.1 as this is not a part of the N stamped class 1 equipment. Am I correct? Should we have to check it as per NB?

I agree that such a temporary closure is always designed conservatively with good margin.

But my interest is to know whether any article or subarticle of Sec III NB addresses this temporary closure and if so which article.

Thanking You in advance for your answer

_________________
R.SRINIVASAN
Sr. VICE PRESIDENT
Head, Design and Engineering
PED,ISGEC,
YAMUNANAGAR
HARYANA -135001
INDIA

Sure this is addressed:

NB 1132, 3647.3 (incl. design requirements!) and 4435
Would this be enough?

DK

Dear Dr.Koelbl

Thank you for your answer, Sir. I would request you to calrify the following please.

1. I was thinking 3647 is coming under piping design. Based on your reply, I understand the intent is same and hence can be used.

2. This temporary blank is to be considered as an attachment with pressure retaining function article: NB-1132.1 (b) (1) as this is a temporary blank or

3. shall be considered as part of the component as per NB-1132.2(b).

_________________
R.SRINIVASAN
Sr. VICE PRESIDENT
Head, Design and Engineering
PED,ISGEC,
YAMUNANAGAR
HARYANA -135001
INDIA

Mr. Srinivasan,

This topic could be something to be discussed with the RPE certifying the Design Report.

However, the main question will be:
Is the temporary blank specified and requried in the Design Spec, or is it a fabrication measure, like a temporary lifting lug?

In the first case the calculation must be in the Design Report, and meet Code criteria. RPE certification required.
In the second case, it can be a separate document referenced inthe test procedure. Design may be based on any safe criteria acceptable to the ANI!
You should talk to the ANI.

DK

Dear Dr.Koebl

Thank you for making the clarity

In the present case it is not required in the design spec, it is only a fabrication measure and will be removed after hydro.

_________________
R.SRINIVASAN
Sr. VICE PRESIDENT
Head, Design and Engineering
PED,ISGEC,
YAMUNANAGAR
HARYANA -135001
INDIA