Compressor B31.3 or Sec. VIII
Compressor B31.3 or Sec. VIII
(OP)
Hi
We have to change piping between defferent stage (4 stages all above 15 psi) of a air compressor.I want to now if the fabrication and inspection are under B31.3 or sec VIII. The client scope refer to both...
The scope is not clear.
Sorry for my english
Thanks
We have to change piping between defferent stage (4 stages all above 15 psi) of a air compressor.I want to now if the fabrication and inspection are under B31.3 or sec VIII. The client scope refer to both...
The scope is not clear.
Sorry for my english
Thanks





RE: Compressor B31.3 or Sec. VIII
Use B31.3.
Why?
See below. which is an excerpt from ASME Section VIII, Div 1
Scope
...U-1(c)(2) Based on the Committee's consideration,
the following classes of vessels are not included in the
scope of this Division; however, any pressure vessel which
meets all the applicable requirements of this Division may
be stamped with the Code U Symbol:
(a) those within the scope of other Sections;
(b) fired process tubular heaters;
(c) pressure containers which are integral parts or
components of rotating or reciprocating mechanical
devices, such as pumps, compressors, turbines, generators,
engines, and hydraulic or pneumatic cylinders where the
primary design considerations and/or stresses are derived
from the functional requirements of the device;....
RE: Compressor B31.3 or Sec. VIII
rmw
RE: Compressor B31.3 or Sec. VIII
RE: Compressor B31.3 or Sec. VIII
This is a serious question made deliberately vague, sorry.
rmw
RE: Compressor B31.3 or Sec. VIII
I will try to give you my (Code view) interpretation;
Question;
Reply; The Hx is not considered integral with the compressor, therefore it could be under the Scope of ASME Section III, Div 1.
RE: Compressor B31.3 or Sec. VIII
That is my take. It is not integral to the compressor, or the next component in the string but it is integral to the overall unit, hence my first post in this thread.
That said, removing it doesn't prevent the engine from running, just makes it run really crappy.
Sorry I am having to be so vague.
rmw
RE: Compressor B31.3 or Sec. VIII
Jurisdiction acceptance is another thing.
If customers requests Sect VIII U stamp, give it to him or her
RE: Compressor B31.3 or Sec. VIII
My actual experience for Compressor unit, Manufacturer has applied ASME U stamp for all the auxiliary process equipment integral to the unit like K.O. drum, Inter cooler & Bypass Cooler as part of the overall unit. They are stand alone equipment connected to the Compressor by piping lines not integrally part of Compressor.
I would think also the reason for U-stamping was based on para. U-1 as mentioned above, since these type of vessels are not included in the scope of Division 1.
U-1(c)(2) Based on the Committee's consideration,
the following classes of vessels are not included in the
scope of this Division; however, any pressure vessel which
meets all the applicable requirements of this Division may
be stamped with the Code U Symbol:
.
.
.
(c) pressure containers which are integral parts or
components of rotating or reciprocating mechanical
devices, such as pumps, compressors, turbines, generators,
engines, and hydraulic or pneumatic cylinders where the
primary design considerations and/or stresses are derived
from the functional requirements of the device.
-pvwander