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Satintime (Mechanical) (OP)
23 Sep 06 15:25
Hi there,

**Wall thickness Required?**


I've been asked to design and manufacture a 100Bar Pressure chanmber.  Basically the chamber will pressure test diver's watches to 100bar or approx 1000metres below sea level.

I will build the chamber from Stainless steel probably 316L as it has good overall corrosion resistance.

The chamber will be approximately 75mm diameter, and say 60mm high.

I was looking at a wall thickness of 15mm does anyone have the correct calculations anywhere?

Thanks

Satin

metengr (Materials)
23 Sep 06 16:45
I would suggest you use ASME Boiler and Pressure Vessel Code, Section VIII, Div 1 requirements for design and fabrication.
Satintime (Mechanical) (OP)
23 Sep 06 16:58
Thanks,

I'm actually British, it might be easier to look for the BS Standards on this matter.


Regs

Satin
Helpful Member!  prex (Structural)
25 Sep 06 8:44
That thickness is more than sufficient, but I hope you are not serious in raising that kind of question.
First thing is that you can't expect to have your design done here.
Second and more important point is that you shouldn't worry only about the shell thickness; your vessel will need two heads, presumably a full diameter flange and at least one nozzle (assuming you will fill, vent and measure the pressure through the same attachment). To assess all these  matters will require more engineering knowledge than what you seem to have available.

prex

http://www.xcalcs.com
Online tools for structural design

Helpful Member!  iainuts (Mechanical)
25 Sep 06 9:57
Hi Satintime,
If you've been asked to design a pressure vessel for 100 bar, and you have no experience or knowledge of the applicable pressure codes in Europe, then you've been put in a very precarious situation.  

I live in the states, but I know there are codes in England, equivalent to ASME, that govern pressure vessel design.  Further, there are laws that require any design and manufacture meet those codes, so if a vessel isn't designed and manufactured (including stamping by some type of independant national board) per the requisite codes, you can be held criminally liable for any damage, injury or death which occurs due to negligence.  Similarly, your system must be designed to certain pressure codes, not just the vessel.  

I might suggest you be only the specifier of the equipment, and have both the vessel and system designed and built by a manufacturer that specializes in this type of equipment.  Figure out what equipment is needed and put specifications together that cover each part.  You will also need to find out what codes the various parts of the system must meet and incorporate them into your spec's.  
Satintime (Mechanical) (OP)
25 Sep 06 16:25
Thanks Lads!

I'm actually building the vessel for myself, I will have to look up the required codes.


Regs

Satin
proinwv2 (Mechanical)
26 Sep 06 19:49
Well even for yourself, follow your code to protect your health and live a long life.

PAUL

Paul Ostand
www.ostand.com

israelkk (Aerospace)
26 Sep 06 21:01
Buy a hydraulic cylinder that works at that pressure and put the watches inside it with the hydraulic oil (do not forget to bleed the air). Close the exit with a pressure gauge and push the piston until the pressure gauge points to 100bar and hold it as long as required.
chicopee (Mechanical)
26 Sep 06 21:42
I was once (1980's)asked to translate a french manufacturer's data sheet on an unfired pressure vessel and from what I remember their equations were very close to our ASME code.  I suspect the English code to be very close to ours.

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