API 610 - type OH2 MAWP

[SHH]

Hi,

I am working on OH2 type pump that is in compliance with API 610 11th Edition.
Material of construction selected for this application is A351 CF8M.
A vendor mentions due to material they can not confirm MAWP 40 bar @38'C and they can confirm only 35 bar @ 38'C
But i think according to 6.3.5-b of API all OH2 pump shall have at least MAWP equal to 40 bar.
is my understanding true or not?
Thank you for your time

 

[physicshack]

Ye, the MAWP should be 40 bar, that said the manufacture is able to deviate from this provided they tell you.

This can be done in order to off you a more cost effective solution. DO you need need the 40 bar MAWP?

 

[SHH]

Thank you physicshack

our design for downstream line is 26 bar @ 100 'C
and calculated MAWP for pump by vendor (according to API 6.3.5) is 19.5 bar @ 100 'C
can i accept this deviation (35 bar @ 38'C)?