off spec piping

[mariolucas75]

Dear forum,

There is a vessel constructed to an ASMVE VII div 1 code (At least as datasheet says).
Vessel nozzle spec says: 4", wall thickness 1.305"

But, in schedule table there is no 4" pipe having thickness 1.305".
Maximum thickness for 4" pipe is 0.674" = 17.12mm (XXS).

Having done physical measurements: ID ~97mm / 3.81"
OD ~ 163,24mm / 6.42""

If the vessel is constructed to an ASME should not it have an ASME compliant piping ? Is it kind of some off spec piping (some custom piping) ?

 

[LittleInch]

Looks like someone did a typo on the 4inch and meant 6 inch?

But that is gun barrel stuff. What sort of pressure is this?

If it has a signed off form (A1?) then see what it says.

But yes you can have custom piping.

 

[mariolucas75]

Design pressure is 14 bar....
Even if it is a typo 6 " also would not have that thickness...

Suppose it is a "gun barrel" or "heavy bore" piping - is there some kind of standard for such thick "things" ?