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nirmal7
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Join Date: Nov 2008
Location: Mumbai-India
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Shell to Roof Junction

02/06/2009 7:20 AM

Weakest weld joint of fixed roof tank is Shell to Roof Junction.

At what pressure does it give away?
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RVZ717
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#1

Re: Shell to Roof Junction

02/06/2009 1:41 PM

I'm afraid before you'll get an answer you'll have to provide some information. Receiving a good answer is directly linked to the quality/substance of the question. Be specific, give the details.

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XMech
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#2

Re: Shell to Roof Junction

02/06/2009 3:08 PM

The weakest weld joint is not necessarily the shell-to-roof, unless it has been designed as a frangible roof joint. The concept of the frangible roof is to ensure that it fails before the shell-to-bottom joint; this is to allow venting of the pressure as opposed to total loss of contents of the tank.

So the answer to your question is - It depends on the design details (design pressure), code (API 650/620 - BS 2654 / ............) to which the tank is built, and if a frangible roof has been specified.

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pipewelder
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#4
In reply to #2

Re: Shell to Roof Junction

02/09/2009 8:37 AM

Very good answer.

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XMech
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#5
In reply to #4

Re: Shell to Roof Junction

02/10/2009 3:18 AM

Thank-you

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ba/ael
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Location: Sherwood Park, Alberta, Canada
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#3

Re: Shell to Roof Junction

02/06/2009 4:43 PM

For a circular tank, p = 4*w/D

where p = pressure inside tank

w = weld strength per unit of length

D = diameter of tank.

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