ASME PVHO-1 Rectangular Pressure Vessel Design 1

[1NeO]

Hello everyone,

I am working on an ASME PVHO (Pressure vessel for human occupancy) and have seen ASME SEC VIII MA-13 appendix about noncircular cross- section, We are using PVelite for most of our calculations, my question is:

Codecalc gives you the analysis for reinforcement section but how do you start designing the head section for a rectangular shell? and in PVHO case a head-door weldment assembly?
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Pressure: 75 psig, Temp: 100°F
Material: SA 516-70
Type of vessel ASME SEC VIII MA-13, 13-2(a)-4
Internal dimension 138"W x 96"H (cross section)

Preliminary results:
T-section for short and long side shows (assumed equal size)
Depth = 10in, Flange = 6 in, both thicknes @ 0.625 in
Shell thickness: 0.5"
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Thanks in Advance.

 

[jehan17718]

1NeO;

PLease note that Codecalc does calulations for rectangular crosssection vessels as per Appendix 13 of ASME Section 8 Div 1.

Further the sccope of Section 8 Div 1 very clearly as per para U-1c2 says that pressure vessels for human occupancy are out of scope of this division. A footnote vectors the reader to ASME PVHO-1.

-jehan

 

[1NeO]

Hello Jehan,

Thanks for the reply - Yes, the T-section detailed above was performed in codecalc (PVElite2007). ASME PVHO-1 (2007) under sec 1-7 "design and fabrication requirements" gives the following notes:

..."The design and fabrication shall be in accordance with
the specified Division of Section VIII of the Code and the
following requirements common to all PVHOs, unless
otherwise permitted within this Standard..."

most of the design philosophy as I understand will either be ASME SEC VIII D1 or D2 (ref: 1-7.13.1) PVHO by itself does not have design guidelines for non-circular cross section pressure vessel.

Anyway I think I have a baseline design for shell and reinforcement section albeit built like a tank but what I need now is some baseline head design (rectangular). Any advice and recommendation are most welcomed.

 

[doct9960]

1NeO,

I am not familiar with PVElite, but if you are looking for guidance in the design of rectangular heads (end closures), refer to paragraph 13-4(f) of ASME VIII-1 MA-13.

 

[1NeO]

Thanks Doc,

That's a very good reference, I will take a look at that in detail in the meantime I have been looking at the door and door frame design that will be incorporated at the rectangular heads. I might have more questions later on.

thanks again.

 

[doct9960]

What type of door? What shape? Whatever type or shape it is, the door opening needs to be reinforced. If ASME PVHO-1 has no rules on opening reinforcement and your rectangular head is a flat head, you could probably refer to the rules of UG-39 in ASME VIII-1. Most probably, ASME VIII-1 will refer you to U-2(g).

See if these links can give you some ideas...

http://www.wbdg.org/ccb/DOD/UFC/ufc_4_159_01n.pdf

http://www.pdhonline.org/courses/m205/m205content.pdf

 

[1NeO]

Hello Doc,

It's a rectangular sliding door.

I have been looking at the links you sent very informative and helpful, I have done the initial calc on the door - once again the door spec is as hefty as the rectangular reinforcement frame; compared as in order of magnitude for PVHO chambers, it would've been a lot easier if it was cylindrical. I'll keep you posted on my progress, Questions & Issue as encountered.

Thanks.