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Anodic Protection for Sulfuric acid tanks Dammam

Sunday, November 23, 2003   By: Sulfuric Acid plant Manager,Saudi Arabia
Dear Sir, we are One of the manfacture of Sulfuric acid .we would like to protect our storage tanks with Anodic Protection due to corrosion.here due to Ambient temprature we are getting more iron content and milkish color if we keep more than 20 days in storage tanks.our tanks are built by 516 gr 70 carbon steel plate.our acid concentration is 98.5% and tank diameter is 7.6 meters, and height 12mts please advise us. Best Regards U.M.Rao mahesh2002347@hotmail.com

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Saturday, November 29, 2003   By: Ashiq Hussain
Carbon steel should not corrode at this concentration of SA. Probably moisture is getting through into the tank during breathing which normally takes place at the time of tank drainage. In adition to A. Protection, it may be appropriate to use silica jel at the entrance of vent pipe so as to absorb all the moisture entering into the tank. Silica jel could be dried out or replenished after discoloration.

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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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