B31.3 or Sec. VIII Div. 1?
B31.3 or Sec. VIII Div. 1?
(OP)
The following is an exerpt from ASME VIII Div. 1 code:
"U-1(c)(2) Based on the Committee's consideration, the following classes of vessels are not included in the scope of this Division...
U-1(f) piping components, such as pipe, flanges, bolting, gaskets, valves, expansion joints, fittings, and the pressure containing parts of other components, such as strainers and devices which serve such purposes as mixing, separating, snubbing, distributing, and metering or controlling flow, provided that pressure containing parts of such components are generally recognized as piping components or accessories."
My interpretation of this is that even if an assembly is above the volume, diameter, and pressure limits of the pressure vessel code, as long as it is fabricated from standard piping components, it can be considered as piping and manufactured by the rules of ASME B31.3 instead of Section VIII Div. 1. Is this correct?
The assembly in question consists of a length of 10" XS pipe with B16.9 caps on either end and some 1" Class 3000 couplings through the wall. It looks like a vessel, but can we call it piping?
"U-1(c)(2) Based on the Committee's consideration, the following classes of vessels are not included in the scope of this Division...
U-1(f) piping components, such as pipe, flanges, bolting, gaskets, valves, expansion joints, fittings, and the pressure containing parts of other components, such as strainers and devices which serve such purposes as mixing, separating, snubbing, distributing, and metering or controlling flow, provided that pressure containing parts of such components are generally recognized as piping components or accessories."
My interpretation of this is that even if an assembly is above the volume, diameter, and pressure limits of the pressure vessel code, as long as it is fabricated from standard piping components, it can be considered as piping and manufactured by the rules of ASME B31.3 instead of Section VIII Div. 1. Is this correct?
The assembly in question consists of a length of 10" XS pipe with B16.9 caps on either end and some 1" Class 3000 couplings through the wall. It looks like a vessel, but can we call it piping?





RE: B31.3 or Sec. VIII Div. 1?
If it is a vessel (static or quasi static fluid inside) and looks like a vessel it is very likely a vessel!
Anyway the service is the primary element to be considered for classifying: what kind of service is your thing for?
prex
http://www.xcalcs.com
Online tools for structural design
RE: B31.3 or Sec. VIII Div. 1?
RE: B31.3 or Sec. VIII Div. 1?
RE: B31.3 or Sec. VIII Div. 1?
RE: B31.3 or Sec. VIII Div. 1?
Is this compressor an API 618 GAS COMPRESSOR?
Leonard@thill.biz
www.thill.biz
RE: B31.3 or Sec. VIII Div. 1?
However IMHO this decision should not be based onto the type of components used to fabricate it, but on the fact that the whole vessel is, as a standard practice, supplied and built as part of the piping.
If your vessel is somehow special, or anyway if you want to cover yourself by staying on the safe side, then you should build it according to ASME VIII.
prex
http://www.xcalcs.com
Online tools for structural design
RE: B31.3 or Sec. VIII Div. 1?
The compressor package is built to API 11P.
prex:
Who decides what volume and geometry may be 'generally recognized as a piping component or accessory'?
RE: B31.3 or Sec. VIII Div. 1?
prex
http://www.xcalcs.com
Online tools for structural design
RE: B31.3 or Sec. VIII Div. 1?
Remember to meet U-1c2e the manufacturer needs to call it pipe or a component.
You need to dicuss this with your AIA.