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Date Posted: 03:22:11 09/29/07 Sat
Author: Craig
Subject: Re: What I've been up to this week...
In reply to: JB 's message, "Re: What I've been up to this week..." on 21:08:34 09/28/07 Fri

>It has a '74 U-stamped code plate on it, but in 1974
>the standard Section VII, Div.I design code designated
>a 4:1 safety factor. It's a 14" diameter w/ a
>longitudinal seam, which would lead me to believe that
>the material is probably either SA-516 Gr.70, or maybe
>an SA-36 plate, which would leave me a minimum of 36
>ksi material. According to newer technological
>advances and through rigorous heat tests, as long as
>this vessel wasn't built pre-'68, I can use current
>code allowable stress values, which would be designed
>using a 3.5:1 safety factor. So...Under the hoop
>stress calculation, P=SEt/(R+0.6t), assuming a 70%
>joint efficiency since I have no NDE indicated on the
>code plate, this bottle can be rated to design
>pressure at 130psi, or there about. This is also
>assuming a 1/8" wall thickness for the vessel. It's
>obviously more. The 1/2" nozzle penetration is exempt
>from area of reinforcement calculations, under Sect.
>VII, Div.I UG-45 or UG-37. I'm not sure.
>
>By the way, I design Section VII, Div. I vessels for a
>living. This little bottle doesn't scare me. =)

Very good, sir!!! I am a bit "rusty" on the subject =), but I assume the impact test was done after your "exempted" welds with your chipping hammer? hehehe

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