corrosion of carbon steel flange

[allegro5]

Due to an error in wall thickness calculations we have two pipelines connected together with a difference of 16mm. this crates an 8mm raised lip on one side.
The fluid is a warm brine produced water highly corrosive fluid with a reasonable amount of dissolved iron, the system is designed to avoid ingrss of oxygen.

My question is: will this lip create turbulance and/or induce a bacterial growth area and hence become a corrosion mechanism.

 

[metengr]

It depends on flow conditions. What is the design process stream velocity thru this pipe?

 

[SJones]

It could become a site of enhanced corrosion (rather than a 'mechanism'). Can you not match bore a little bit to give a transition?

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/

 

[allegro5]

The rating of the system is 1500 ILB

I may the contractor ask to chamfer the flanges to help the transition

 

[EdStainless]

I would expect some accelerated erroson/corrosion at the site. Anything that will reduce the turbulance will help.

= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[mshimko]

From a strength perspective, I doubt very much that the flange will be the weak link. You can probably taper the edge of the one flange quite a bit, with the limiting factor being cost.

As others have stated - reducing turbulance will only help.