Chemical Pipeline Design

[jph90]

Hi All,

Looking for some guidance on the best materials to use for Sulfuric Acid pipework transfer, and diluted but low pH mixture. There are two operating conditions:

1) 98% Sulfuric Acid injection to a tank - ambient temp but tank is heated w/steam to approx 90-100 deg C therefore can consider some heat transfer, particularly at the connection point/flange
2) Highly acidic (pH 2) Acid Water and Acid Oil pipelines (following injection of H2S04) at 100 deg C, roughly 5% dilution of sulfuric acid in the mix.

Pipeline velocities <2m/s

For background info the application is an oil soapstock splitting plant

Appreciate any help

 

[KevinNZ]

We have build ambient 98% lines from 316 stainless steel. Once this is diluted and hot then the fun really starts. In one application we worked on parts of the system was made from Tantalum.

 

[LittleInch]

There are previous on this if you just search "acid pipelines~", like this

http://www.eng-tips.com/viewthread.cfm?qid=270320

and

http://www.eng-tips.com/viewthread.cfm?qid=369828

hot, very acidic fluid - Internal plastic type linings won't like it much from the temperature point of view, you're definitely into exotic materials if you don't have a liner.

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