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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Can I install platforms and stairs after the hydrotest? - Tuesday, March 13, 2012 - Fabian [1311]
I dont have the material to install these accesories to the shell but i need to do hydrotest urgent, can i install the platforms and stairs after i do the hydrotest or API650 restrict that???
Re: Can I install platforms and stairs after the hydrotest? - Tuesday, March 13, 2012 - Tankee [235]
7.3.6.1 This hydrostatic test of the tank shall be conducted before permanent external piping is connected to the tank. Attachments to the shell defined in 5.8.1.1, located at least 1 m 3 ft above the water level, and roof appurtenances may be welded during the filling of the tank. After completion of the hydro-test, only non-structural small attachments may be welded to the tank in accordance with 7.2.1.11.
Re: Can I install platforms and stairs after the hydrotest? - Tuesday, March 13, 2012 - Tankee [235]
I think I am losing your meaning in that question. If you are asking if you can install the stairs and platform onto the tank shell after the hydrotest - yes for 1 m above the water line - but no for anything below that point. Any stairs above that point and the roof platform can be installed and any other stairs from the bottom up to 1 m above the water line cannot be installed. But, if you are installing a stringer type stairway, the supports could be welded to the shell and the stairway bolted onto those after the hydrotest. I would suppose you could weld support to support, as long as nothing is being welded to the shell after the hydrotest.
Re: Can I install platforms and stairs after the hydrotest? - Saturday, March 17, 2012 - Syah [681]
What I have done in the past for the same situation, weld all pad plate of stairway supports on the shell. After hydrotesting the stairway supports are welded to the pads which are already welded before hydrotesting.
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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 
I dont have the material to install these accesories to the shell but i need to do hydrotest urgent, can i install the platforms and stairs after i do the hydrotest or API650 restrict that???
7.3.6.1 This hydrostatic test of the tank shall be conducted before permanent external piping is connected to the tank. Attachments to the shell defined in 5.8.1.1, located at least 1 m 3 ft above the water level, and roof appurtenances may be welded during the filling of the tank. After completion of the hydro-test, only non-structural small attachments may be welded to the tank in accordance with 7.2.1.11.
What I have done in the past for the same situation, weld all pad plate of stairway supports on the shell. After hydrotesting the stairway supports are welded to the pads which are already welded before hydrotesting.
Industrial Training School and AIS Forensic Testing Laboratory.
