ANSI Flange Question 1

[PeteBennett]

Dear All,

Am sure this is a simple question, but I do not work with ANSI equipment very often, I have a specification that is written Class300 B16.5RF 250 - 500 AARH. Can someone please tell me what the AARH stands for?

Thanks

 

[arto]

the surface finish

 

[StoneCold]

PeteBennett
The flange spec Class 300 B16.5RF 250-500 AARH is telling you 300# flange class, Raised face with the spirals on the face having a finish of 250-500 AARH Here is a link to some pictures showing the different finishes.

http://www.mackiron.com/images/Capabilities/finishes.htm

 

[PeteBennett]

Gents, my appreciations,

Its a useful website StoneCold