×
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

Material Selection for Geothermal Brine
3

Material Selection for Geothermal Brine

Material Selection for Geothermal Brine

(OP)

Dear All,

What kind of material would you suggest for a geothermal brine which has TDS (57000) and Cl (44140) concentrations? Ph of the brine is 7.5. On the other hand it is also rich in Ca, K and Mg. Well temperature is 174 Cdeg. Surface temperature is around 150 Cdeg.

I have reviewed some documents of Sandvik's dublex stainless steel especially for seawater service. Exotic materials like dublex stainless steel for steamfield piping is very pricy.

At geothermal pipelines, silica depoits form in time. Isn't this silica deposition protective against corrosion? Doesn't it act like a protective layer in the pipe. (Please note that we will inhibit chemicals in the well to disable severe deposition)

Looking forward to your comments,

Best Regards,

RE: Material Selection for Geothermal Brine

2
MATERIALS SELECTION GUIDELINES
FOR GEOTHERMAL POWER SYSTEM
http://www.osti.gov/energycitations/servlets/purl/6356102-P6Q504/


COMPANION STUDY GUIDE
TO
SHORT COURSE ON GEOTHERMAL CORROSION
AND MITIGATION IN LOW TEMPERATURE
GEOTHERMAL HEATING SYSTEMS
http://www.osti.gov/geothermal/servlets/purl/894036-6X5f9k/894036.pdf

CORROSION BEHAVIOR OF MATERIALS EXPOSED TO
HYPERSALINE GEOTHERMAL BRINE

http://www.osti.gov/bridge/servlets/purl/6664773-3YfNAO/6664773.PDF

AN EVALUATION OF MATERIALS FOR SYSTEMS
USING COOLED, TREATED GEOTHERMAL OR
HIGH-SALINE BRINES
http://www.osti.gov/energycitations/servlets/purl/6918703-xi8D2F/6918703.PDF

ADDENDUM TO MATERIAL SELECTION GUIDELINES
FOR GEOTHERMAL ENERGY UTILIZATION SYSTEMS
http://www.osti.gov/energycitations/servlets/purl/890120-e1QAdE/

hope this help
S.

Corrosion Protection & Corrosion Control
 

RE: Material Selection for Geothermal Brine

No the deposits don't help, they hurt.  The scale formation isn't fully dense.  It acts like a crevice former trapping impurities under it and accelerating corrosion.

One thing in your favor is that the brine has no oxygen in it.

Still, your only real options are high alloy stainless grades.  You are probably looking at super-duplex alloys these days in terms of economics.  They have high strength so you can use thinner walls, and the low Ni content keeps the price from being as high as the 6%Mo super-austenitics.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Material Selection for Geothermal Brine

(OP)

Gentlemen,

Thank you very much for your valuable input. This is for a new jeotermal power plant project in west coast of Turkiye. There are other JES Power plants in the country but they do not have such corrosive brine. They use carbon steel pipes with inhibitor system at the well.

Thanks again,

RE: Material Selection for Geothermal Brine

With regard to geothermal-type pipelines, I think several different (uninsulated and pre-insulated etc.) piping materials have been used over many decades of such applications, e.g. even including asbestos cement pipes.   While I don't profess a lot of direct experience in this specific application, I know that a good bit of cementlined pipes has been used in these and other salty and thermal water services, and some contemporary geothermal users (e.g. http://geoheat.oit.edu/bulletin/bull28-2/art2.pdf and other sites), and due in some cases to problems (not the least of which are various effects of the heat often involved) with other pipes and joints etc., have gravitated to cement mortar-lined ductile iron pipe.  Care should of course be taken in the selection of gaskets, as standard SBR AWWA pipe gaskets are not rated for the extreme degree of heat often encountered in some geothermal applications.  I think ductile iron geothermal systems typically employ available special rubber formulations, with adequate rating to handle the heat (such as EPDM).  Finally, I think it is possible consideration of some system design and operational factors, e.g. flow velocity, control of any chemical additions, and aeration or non-aeration in periods of service or disruption etc., could also factor in along with material selection in potentially aggressive exposures.        

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