Silicon Bronze or Aluminum bronze in brackish water

[stanweld]

A cooling tower manufacturer has proposed using silicon bronze bolting and trim in cooling water service containing 16,000 ppm chloride, 1 ppm H2S and 3 ppm ammonia at approximately 80F. Pressure from atmospheric to 60 psi. Does this selection appear feasible?

 

[EdStainless]

I used to put hardware into H2S and seawater, I used Monel K500 for high strength and NAB (Ni Al bronze) for low strength.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[stanweld]

Ed,
Thanks for the quick reponse. I felt that Al Bronze, NiAl Bronze or Monel were good choices without resorting to Ni-Cr-Mo alloys. With the high price of Ni and Mo these days (I just received info of an approximate 15% increase in Ni the past week) NiAl Bronze would certainly be more economical.

The brackish cooling water is well water and I believe H2S should out gas when depressurized. Bolting is primarily connecting fiberglass components. Stress on bolts will not be high.

 

[SJones]

Also take a look at NiDI documents:

11 003 Nickel stainless steels for marine environments, natural waters and brines - Guidelines for selection

11 004 Materials for saline water, desalination and oilfield brine pumps

http://www.nidi.org/

Steve Jones
Petroleum Development Oman LLC
Muscat
Sultanate Of Oman