T / P Markings when Welding Strainer to Flange for assembly??

[TEIGRAY]

Hi All,

I'm designing a steam trap assembly,
part of this includes Y-strainer directly welded to a flange
The strainer has cast on markings of TMA 500'C, PMA 50 Bar, Material CF8M
the Flange will be in stainless steel 316L, being either ASME #150, #300 #600 or EN PN40
Any one of these flanges can be welded to the strainer depending on the connection type required by the end user,

My question is:

Do I need to change the markings on the strainer once its welded to the flange as it'll be supplied as a single piece?

Cheers all

Edd

 

[XL83NL]

Using 316L flanges up to 500 °C is not allowed under B16.5 rules (Class-rated flanges), and I believe the same applies to EN 1092-1 (PN-rated flanges). Furthermore you cant use PN40 flanges (as they start with a rating of 40 bar(g) at ambient), and for Class rated flanges, you need Cl. 600 at minimum.
All the above assuming the design of the assembly meets the marked rating on the Y-strainer.

What design code or standard do you use for this assembly to verify it's design?

 

[TEIGRAY]

So are you saying that as soon as a flange is welded to a item that item markings need to be changed to be in line with the flange welded to it?

or would the flange markings always be taken as the maximum conditions?