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Earl   AST Forum  

Tube seal life time

Wednesday, August 02, 2017   By: rl [521] 3 Stars
What is the life time of tube seal water filled EFRT crude oil tank , hot desert weather ?
Thanks

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Wednesday, August 02, 2017   By: Dunedin [37] 4 Stars
Two factors: The condition of the tank and in particular if there are any burrs on the weld seams and the frequency the tank is filled/emptied. Tube seals are less expensive to purchase than say a mechanical seal but they are generally used in older tanks when it would not be sensible to install a more expensive seal. I think you should plan on a life expectancy of three to seven years.

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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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