Lined Check Valve 3

[micalbrch]

Hello together,

Does anybody here know a manufacturer of lined (coated) high pressure check valves? We have an application for well water with extremely high chloride content - average 90000 ppm, max. up to 150000 ppm. Ambient temperature, pH between 6.5 and 7, no solids. Required size is DN 150 or 6", pressure around 2000 psi. I think with this high chloride content even Nickel alloys will not resist although one can assume that the check valve will be completely filled with water all the time (no air pockets). Any ideas? Thanks in advance!

micalbrch

 

[LittleInch]

Just a thought, but have you tried Aluminium bronze either as a material or a coating. I know it works very well on warm seawater, but you'de need to check with a metalurgist about CL levels of 150,000. I assume this water is or could be oxygenated? Once you take all the oxygen out, then C Steel will do the job, but you need a vacuum tower and chemical dosing.

The issue with any coating be it spray on or metallic in a check valve is potential wear and damage then leading to very high corrosion rates of the substrate material.

For a 6" valve I would have thought you are far better going for a valve of the whole material including all internals in whatever will resist your fluid.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[SJones]

The conditions are not too arduous for several nickel alloys, for example C-276, which you could push to 100+ deg C at that chloride level and oxygen free. However, what is the material of the pipe that the valve will sit in?

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[micalbrch]

Thank you both for your advices!

LittleInch: "..a valve of the whole material including all internals in whatever will resist your fluid". That's exactly my problem. Do you know somebody who manufactures check valves made of or with the aluminum bronze coating you mentioned?

Steve: The pipe is made of powder-coated carbon steel. And any idea who manufactures check valves made of nickel alloy?

 

[gerhardl]

You might try offshore- oriented companies with hastelloy c valves. Bronze could be difficult. Is 2000 psi correct (About 138 bar)?.
Other placement at lower pressure possible? No air pockets does not necessarily mean free of air, and resulting corrosive components with composures of combined H/CL/O content should be considered.

Flowserve/ Gestra advices such valves (because of pressure) 'on request'. Maybee higher commercial availabillity if you go down in size from 6". Even if this is the pipeline size, flow conditions might allow a smaller checkvalve. Ask suppliers for advice.

 

[gerhardl]

Adding the relevant link to Gestra checkvalves:

http://www.flowserve.com/files/Files/Literature/ProductLiterature/FlowControl/Gestra/810107.pdf

 

[micalbrch]

Thanks gerhardl! I'll check the Flowserve site. Yes, 2000 psi is correct. No, we can't place it at the low pressure side as there is a pump which must start against the full vertical line pressure and the check valve shall be installed between pump and pipeline. Reducing the size of the valve to 4" might be possible if that increases the possible vendors. I already though about it. The pump is rubber lined inside (just in case that somebody wants to ask). Yes, I know that "no air pocket" does not mean that there is no oxygen in the water but I think at this high chloride content the presence of an air pocket will definitely attack any metal.

 

[hsbcn]

micalbrch:

you can also have a look at

http://www.chemvalve.com/

good luck with the search!



High-alloy valves for corrosive petrochemical applications.