caustic solution piping 2

[Tarlan94]

I have to design piping system for 40% caustic solution at 25C,i take caustic solution from mixing vessel at 2m^3/h with the velocity of 1m/s,then diameter of pipe become 2.6cm which is i very small i guess.What is recommended velosity and diameter for this process ?

 

[EmmanuelTop]

See pages 23-26 of the document:

http://www.oxy.com/OurBusinesses/Chemicals/Products/Documents/CausticSoda/caustic.pdf

and

http://dowac.custhelp.com/app/answers/detail/a_id/2610

Also check the earlier thread

http://www.eng-tips.com/viewthread.cfm?qid=151233

Dejan IVANOVIC
Process Engineer, MSChE

 

[Latexman]

2.6 cm ~ 1 inch pipe.

Good luck,
Latexman

Technically, the glass is always full - 1/2 air and 1/2 water.

 

[bimr]

What you are using (velocity of 1m/s, diameter 2.6cm) is appropriate.

 

[Tarlan94]

with this values flow becomes laminar,will it make problems/errors during pump design ?

 

[bimr]

No problems with laminar flow. The caustic will be dissolved as long as the temperature does not drop.

The 1m/sec is a typical flow rate for chemicals. You want to keep the flow rate between 1 to 2.5 m/sec. If you want, move down to the next pipe size.

 

[EmmanuelTop]

Spot on. 1 m/sec recommended for CS and up to 2.5 m/sec for SS in company guidelines for Caustic lines.

Dejan IVANOVIC
Process Engineer, MSChE