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Earl   AST Forum  

Lawrence on Replace floor or install a double bottom?

By: Lawrence 
Date: Thursday, June 30, 2005
Time: 12:00:00 AM

Last year I had the unfortunate experience of having a side bar talk to a client about corrosion on the tank floor. The containment site was lined and a double bottom was added in the past. There is sand between the original floor and the new floor with what appeared to be reason supports. The was a drain connection between the two-floors that would drain trapped liquids into the containment. The containment gets iced up and snowed in and consequently on Spring days ponding occurs near the tank foundation. An inspector in the previous summer had requested some of the drains be open. Every one forgot and the following year after my side bar talk I walked the tank down and asked about these drains. One was opened for me and water poured out with some sand. I cannot tell you enough how disastrous this was for the client and that inspection firm. I have not had the need to call on that client recently, but I wonder every time about the consequences. Your story reminded me of this and I suggest to remember to consider water contamination between the floors if you go this route. Lawrence



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Featured
Atmospheric Design Pressure
By: Fathi [46]

The whole story is to avoid brittle fracture=

Test temperature shall be equal or warmer than Minimum Metal Design temperature at Test pressure.
------------------

I would limit my minimum testing temperature for a tank (or even for a vessel or a piping system) by the =

Temp = maximum of [ Min(lower shell) , Min(shell# 2) ....Min (Upper shell) ]

For a Shell# i the minimum is function ( of shell tickness , Material group ) and this can be found in API 650 , Fig 2-1

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