×
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!
  • Students Click Here

*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

Jobs

Iron concentration of Boiler Water

Iron concentration of Boiler Water

Iron concentration of Boiler Water

(OP)
Can  any body help me regarding our boiler water  system. Iron concentration and low pH predominates our condensate from the heat exchangers. Any advise as to how we would be able to prevent it from happening. We  have tried demineralized water and softened water already for make up. Still we could not prevent it from having iron concentration. We suspect leaking already at HE but the treatment of chemicals were not really reliable from our water treatment specialist.

RE: Iron concentration of Boiler Water

You need to elevate the pH to about between 8.5-9 by using a boiler feedwater chemical treatment program. The low pH does not promote stability of a protective oxide layer on carbon steel, thus corroding the surface of the steel and resulting in iron contamination. This protective oxide layer is called magnetite, and is stable in the high pH range mentioned above.

There are plenty of web sites that contain information on boiler feedwater treatment programs.

RE: Iron concentration of Boiler Water

(OP)
metengr,
     
        Can you guide me through the website just mentioned?
        Thanks


gladkenn

RE: Iron concentration of Boiler Water

high iron content in condensate indicates a probable corrosion process on-going!.

A low pH condensate may indicates that:
-you need a volatile treatment (NH3, Hydrazine etc.)
or
-your system has a lot of traped air or it get contaminated with air intrusion.
or
-you have a corrosive leak

A reputed chemical company like NALCO, GE or others can help you if you do not have the required knowhow.

Nalco has a written a good manual which you can buy by internet (www.Amazon.com?).
rgs

RE: Iron concentration of Boiler Water

There have been some advances in the field of feeedwater treatment, mostly as fallout from the use of the combined oxygenated treatment method used in once thru steam generators.

For the use of standard low O2 fedwater treatment, the pH from 8.5-9.2 is typical, but it is also essential to retain an O2 content of about 2-4 ppb O2 downstream of the feedwater heaters. This insures that there is not excess hydrazine or excess oxygen scavenger in the condensate, which would promote corrosion of the magenetite as badly would too high an O2 content.

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!


Resources