Material for 10000 PPM Chlorides
Material for 10000 PPM Chlorides
(OP)
Which material can be used for the piping and the pump for above chloride content. Chlorides of 10,000 PPM.
Operating Temp: 45 deg C.
Also recommend material for even higher chlorides say Sea Water.
Operating Temp: 45 deg C.
Also recommend material for even higher chlorides say Sea Water.





RE: Material for 10000 PPM Chlorides
Cost wise the first choice would be non-metallic, either solid plastic or fiberglass.
That is if the temp and pressure allow it.
If you want to go metal you really are looking at alloys suitable for seawater service.
The Cl level is not the major factor, Temp and pH are more important.
Alloys such as 6% Mo superaustenitics (AL-6XN, 25-6Mo, 1925hMo), or for thin wall tubing a superferritic (Sea-Cure or AL-294C), or a superduplex (255, 2507) all have proven service in these conditions.
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Plymouth Tube
RE: Material for 10000 PPM Chlorides
RE: Material for 10000 PPM Chlorides
The 6% Mo alloys have been in use in seawater for 30 years, they are considered legacy materials.
Look at the ATI reference
https://www.atimetals.com/products/Pages/al-6xn.as...
I wouldn't touch NAB for piping (pumps and valves maybe, but it needs low velocity), maybe 70/30 Cu/Ni as another option, but much lower strength than SS and it has its own corrosion issues.
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Plymouth Tube
RE: Material for 10000 PPM Chlorides
RE: Material for 10000 PPM Chlorides
But that said they would be my first choice also.
Unless heat transfer is involved (like in a heat exchanger) they are often a much more economical option.
One reason is that people often are reluctant to spend the money on the correct alloy so they try to cut the corrosion resistance close. This results in serious ongoing corrosion issues and high maintenance costs.
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Plymouth Tube
RE: Material for 10000 PPM Chlorides
Also do you mean that DSS can be used for Sea Water application at temperatures of 45 deg C... Same is mentioned in NACE ??
Non metallic is not considered an option here ...
RE: Material for 10000 PPM Chlorides
RE: Material for 10000 PPM Chlorides
If you really need strength then a a superduplex would have advantages.
But the welding of these alloys is much more difficult that for the superaustenitic alloys.
If you look in data from Outokumpu you can find temperature and Cl limits for duplex alloys.
http://tools.outokumpu.com/spt/corrosion/corrstart...
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Plymouth Tube
RE: Material for 10000 PPM Chlorides
http://www.outokumpu.com/SiteCollectionDocuments/O...
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Material for 10000 PPM Chlorides