Welcome to the aboveground storage tank forum, a bulletin board dedicated
to tanks, fuel tanks, plastic tanks, fuel storage tanks, and above ground storage
tanks (AST) API650, API653 & UL142
aboveground storage tanks (AST) and chemical plastic tanks. Remember the forum
is made up of volunteers from experts to beginners. Unfortunately, we cannot allow free commercialism that promotes products, services, or sites.
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Is the use of a vacuum box for detecting cracks of use or not? Has anyone ever found a crack, pore, etc. on a weld of : -bottom plate - corner weld -shell welds? I am not talking about random tasks, but traceable results.
Thanks for your educated answers or inputs.
Goost
Sorry for bad writing, as I am not a natural english speaker.
VB can find a crack, if it is all the way through. However there are better ways of crack detecting than a vacuum box. I can only remember finding a crack on a lap weld twice and in both cases it was on a sump flange to floor plate breakdown weld. Diesel testing of the corner weld will find discontunities a lot easier than a right angle vacuum box. If a crack is suspected in the corner weld mag testing should find a crack.
To specifically find cracks in welds, as BABRTs mentioned, there are better methods since a VB test will only find through holes / cracks. That said, a VB test can be quite effective in finding leaks holes, pores, cracks, etc in welds and plates usually used on welds. So, if your question is: Is it worthwhile to perform vacuum box testing? the answer is Yes.
It is a quick and easy test to look for leaks and can be performed and witnessed by people with just a minimum amount of training.
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ETANK2000: The #1 CAE tool for aboveground storage tank design / re-rating / inspection evaluation to API-650, API-620, API-653, & UL-142
AMETank (comming soon): All of the ETANK2000 engineering / code calculations plus Bill of Materials, Fabrication Drawings, and (soon) Estimating.
4611 Broad River Road, Suite I
Forum 
Dear Reader,
VB can find a crack, if it is all the way through. However there are better ways of crack detecting than a vacuum box. I can only remember finding a crack on a lap weld twice and in both cases it was on a sump flange to floor plate breakdown weld.
To specifically find cracks in welds, as BABRTs mentioned, there are better methods since a VB test will only find through holes / cracks. That said, a VB test can be quite effective in finding leaks holes, pores, cracks, etc in welds and plates usually used on welds. So, if your question is: Is it worthwhile to perform vacuum box testing? the answer is Yes.
Industrial Training School and AIS Forensic Testing Laboratory.
