Is nickel aluminum bronze a good pump material that is exposed to brackish water (2,000 - 5,000 mg/l chlorides) that has hydrogen sulfide levels of - 4 mg/l? I believe 316 SS is a better material, but please confirm.
Topic: Which is better for a pump: nickel aluminum bronze or stainless steel?26 July 2012 Last edited: 26 July 2012 At 2:53pm
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Brian Dalder Forum Moderator 177 Posts
Re: Which is better for a pump: nickel aluminum bronze or stainless steel?26 July 2012 at 2:52pm Last edited: 26 July 2012 at 2:53pmYour concentration range of chlorides is high enough to be of concern with 316L stainless steel. Generally, the rule of thumb for continuous chloride exposure to 316L stainless steel is 1000 ppm. The references I checked say that aluminum nickel bronze is acceptable for brackish water and sodium chloride at 70 °F but not for wet hydrogen sulfide gas. However, your hydrogen sulfide levels may be low enough that corrosion won’t be an issue. What alloys might work for your application will depend not only on the chloride and hydrogen sulfide levels, but also on temperature and what other species are present. If you can’t find the data to support the selection of an appropriate alloy, lab testing should be considered.