×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Test water for austenitic and duplex stainless steel

Test water for austenitic and duplex stainless steel

Test water for austenitic and duplex stainless steel

(OP)
hello all

witch one is request for Test water for austenitic and duplex stainless steel 1- chlorine content shall not exceed 50ppm or 2- combined fluorine and chlorine content shall not exceed 50ppm.

regards

RE: Test water for austenitic and duplex stainless steel

You should request potable water quality for a hydro test. With potable water, you will be allowed to discharge the water without environmental permitting problems.

The secondary standard for potable water is a pH of 6.5 to 8.5 units.

Some metals many have lower limits for certain water quality parameters. Potable water quality for hydrotest of Stainless Steel Tanks shall be "maximum 50 mg/L of Chloride" in Appendix S of API 650 (Atmospheric Tank Standard).

Fluoride is not usually present in water. However, potable water typically has approximately 1 mg/L added fluoride.

Has been discussed many times on this forum:

https://www.eng-tips.com/viewthread.cfm?qid=416885

https://www.eng-tips.com/viewthread.cfm?qid=208815

https://www.eng-tips.com/viewthread.cfm?qid=352353

https://www.eng-tips.com/viewthread.cfm?qid=401685

https://www.eng-tips.com/viewthread.cfm?qid=252504

https://www.eng-tips.com/viewthread.cfm?qid=415362

https://www.eng-tips.com/viewthread.cfm?qid=208815

RE: Test water for austenitic and duplex stainless steel

Thanks for the references bimr, I didn't want to go looking for them all.
I have seen lower Cl values in some end user specs. but 25ppm is the lowest that I have encountered.
50ppm Cl, and/or 100microS conductivity, and 6.5-8.5 for pH is fairly common.
Drinking water in the US is limited to 250mg/l and a TDS or 500mg/l.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Test water for austenitic and duplex stainless steel

ASME PCC (#3?) also holds the same limit of 50 ppm Cl.

Huub
- You never get what you expect, you only get what you inspect.

RE: Test water for austenitic and duplex stainless steel

50ppm clorides

RE: Test water for austenitic and duplex stainless steel

For aust SS grades, think you need to dope the water with hydrazine also to mop up the dissolved O2 also as an added measure so chlorides dont get to corrode the metal.

RE: Test water for austenitic and duplex stainless steel

George, if the system was going to sit closed I would agree.
But most of these cases the system is open to air prior to test, and then open to air after test.
Oxygen saturation is nearly assured.
I am more concerned with biological activity. I would like to see something other than bleach used, such as hydrogen peroxide.
You can buy H2O2 + peracetic acid mixtures that are very effective at 1% concentration. Straight H2O2 requires something higher than 3%.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Test water for austenitic and duplex stainless steel

Agreed, biocide is a must for hydrotest media, regardless of material of construction. There are biocides that dont rely on O2 - oxidation to kill bacteria for SS grades, from memory.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close