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Earl   AST Forum  

Hydrogen blisters

Monday, October 01, 2018   By: ADI HAR-SHOSHAN [93] 4 Stars
What are the recommended practice actions to be taken when dealing with hydrogen blisters?

Picture Picture

Click on picture for full size view or to view PDF!

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Wednesday, October 10, 2018   By: ITS [1678] 4 Stars
As long as you are reasonably sure you have hydrogen blisters or a hydrogen blister, then you have a few choices to consider and they depend on the severity of the hydrogen blister. In one situation you could prevent atomic hydrogen from continuing to accumulate in the steel by coating the steel, but the steel probably has a lamination or inclusion that has collected the atomic hydrogen that will become molecular hydrogen H2. This molecular hydrogen H2 may rupture the steel.

I have heard of butane storage tanks getting hydrogen blisters.

Do you have a photo of the blister?


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Saturday, October 13, 2018   By: ITS [1678] 4 Stars
Great pictures of hydrogen blisters in the sheet or plate steel of tank. My impression is that as long as the steel is reasonably clean of inclusions, lamination and porosity, then repairing the shell will be a localized repair. But, as I think you know, replacing the sheet is likely and maybe more will need attention at some point if not sooner. You may want to explore for the above discontinuities in the shell if other shell sheet steel come from the same steel mill heat number.

What is the content inside the tank?

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Saturday, October 13, 2018   By: ADI HAR-SHOSHAN [93] 4 Stars
The content is crude oil and tha tank age is 80 years

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Monday, October 15, 2018   By: ITS [1678] 4 Stars
Thank you.

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Monday, October 15, 2018   By: Dunedin [1843] 1 Stars
For me this has been one of the more interesting posting I have seen AST.

I learned so much about an issue that I knew so little about.

It would be good if someone could just summarize the matter with expert comments on: causes - implications - treatment, etc. and post for all to read and hopefully better understand.

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Monday, October 15, 2018   By: ITS [1678] 4 Stars
Was the tank always coated or painted?

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Published on ast-forum.com


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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