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[MW:3703] scope of ISO Recommendations for Boiler Construction...

By Materials & Welding

Hello all,

I have query regarding application A106 specification.

In the old edition of Astm A106 - edition 99 and  latest SA106 specification, there is a clause for Additional requirements of yield strength as per A 520 shall be followed in case the product to be used in application confirming to  ISO recommendations of Boiler Construction.

1 )Can anyone explain me the definition / scope of  ISO recommendations of Boiler construction ?

also. As per current ASTM revisions,  standard A520 has made Obsolete &  the clause of additional requirements for ISO recommended Boiler construction has been removed in revised edition of A106 - edition. 2009.

now to design pipe class according to ASME 31.3 , do I have to consider any additional requirement ?

One of the reply from Lloyds NOBO. was to follow yield strength  as per ASME section II part D table Y-1.

Then for calculations , which allowable stress value shall be consider , ASME 31.3 table A-1  or  ASME Se. II part D, table 1A ?

kindly advise me on the matter.


Kind regards

Rahul

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