Overpressurizing / Overfilling steel tanks

[omar]

The Faber web site identifies that their cylinders are manufactured in compliance with ASME Code Section VIII. The ASME Code Section VIII stipulates that all pressure vessels must be designed for the most severe conditions of coincident pressure and temperature that are expected during normal service. Normal service includes conditions that are associated with deviations from normal operation that can be anticipated.

It also specifies what materials may be used for ASME Code vessels, plus rules and limitations on their use. Criteria for the materials include their Strength, Corrosion Resistance, and ?Fracture Toughness. Fracture toughness refers to the ability of a material to withstand conditions that could cause a brittle fracture which is typically catastrophic in nature. So any argument that the cylinder specs on the web site are for ideal conditions is inaccurate.

Also, I don't think that I could have come up with a worse analog to filling scuba tanks than standing on a pop can if I tried.

Hell yes a pop can will fail when subjected to a compressional load. Pressure vessels behave differently under compressive forces than when they are exposed to tensile forces (e.g., from internal pressure). This difference in behavior is due to elastic instability, which makes shells weaker in compression than in tension. The main point of this demonstration was missed. That you should not use a component designed for a specific use in another application.

What does this tell us a about a scuba tank? That you better keep those cinder blocks to park your car on in your front yard. A scuba tank will most likely fail if you try to use them for this.

omar

________________________________________________
This has got to be the most humorous oxymoron I have seen a while: Libertarian Lawman.

 

[The Chairman]

If you are agreeing or disagreeing... the caveat "expected during normal service" seems to be agreeing with what I have been saying... the "testing pressure" is not to be confused with the resultant "service pressure" which has factored in "the most severe conditions". This would include variances not encountered in a pressure cycle test. Consequently, the test pressure would have to greatly exceed that of the service pressure.

BTW, could you point us to that Faber website; I can't seem to get my browser to find it. Thanks in advance...

 

[roakey]

Originally posted by roakey
Ya know, I just realized that no engineer or scientist has told me that joew is really an engineer, so his statement is now suspect

I just got some private mail from joewr that I think traces back to the above statement.

It appears that the statement was not taken in the manner I meant it, so let me step up to the plate and first apologize and then explain to hopefully clear the air.

[first person]

Joewr, I was taking a poke at your position that only data from engineers and scientists is valid data. I was joking that I needed some third-person engineer or scientist to tell me what you were in order for the information that you were an engineer or scientist to be “real data.”

That you would take it as a real accusation on my part that you were NOT an engineer or scientist was NEVER my intention and quite honestly it never even occurred to me that you might interpret it that way.

Believe me, you were slugging away at the nits as only a technical person could, I have no doubts as to your background.

So again, I'm sorry.

Roak

 

[Bob3]

Picking nits, man that's a lousy thing to say.

 

[joewr]

Originally posted by Bob3
Picking nits, man that's a lousy thing to say.

Bob,

Have you been attending the NetDoc's class on Punning while Sunning? Or does perverse humor just come naturally?

Joewr...some people are just so far ahead of the game they ought to be called BobInfinity...

 

[The Chairman]

You deserve another star for that one... but I would have used the alternate spelling... "lousey"

:tease:

 

[large_diver]

What is it about tanks that always results in such "battle royales" on this board ;-)

 

[JoelW]

Speaking of nitpicking, it wasn't joewr that made the the statement confirming that things falling will hurt feet. It was JoelW. I don't mind having someone question whether I am an engineer or not. Gorilla end users do it all of the time.

JoelW

 

[Bob3]

NetDoc, using an extra letter in a word when you don't have to is just barnyard dumb. Think of the bandwidth overloading that would take place if everyone in the world would insist on sticking extra letters in the words, the whole web would crash!!!

 

[The Chairman]

AnEd IE wouEld neeEd toE seeE somEe datEa, collecEted ONLeY by scienEtists anEd engineEers to validaEte youEr hypotheEsis. NoEw thaEt youE mentiEon iEt... iEt waEs a lousEy reccomendaEtion oEn mEy parEt. TEo reaEd thiEs messaEge removEe alEl LetteErs thaEt arEe noEt "E"s... yoEu goEt iEt...


EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE!!!!!!!!!!!!

:tease: