6Mo vs SDSS for produced water injection pumps
6Mo vs SDSS for produced water injection pumps
(OP)
Hello,
Client requirement for produced water re-injection pumps with the following process conditions and parameters is 6Mo super austenitic:
temperature: ~ 70 degC
pressure: ~ 200 barg
chlorides: 157000 mg/l
H2S: 24 mg/l
CO2: 650 mg/l
One supplier has stated that SDSS is better suited to this application. I have done some research into the corrosive resistance of both metals and I am unable to determine which is better suited, however, my understanding is that 6Mo is better suited in cases featuring such high chloride contents.
Would greatly appreciate your valuable feedback.
Client requirement for produced water re-injection pumps with the following process conditions and parameters is 6Mo super austenitic:
temperature: ~ 70 degC
pressure: ~ 200 barg
chlorides: 157000 mg/l
H2S: 24 mg/l
CO2: 650 mg/l
One supplier has stated that SDSS is better suited to this application. I have done some research into the corrosive resistance of both metals and I am unable to determine which is better suited, however, my understanding is that 6Mo is better suited in cases featuring such high chloride contents.
Would greatly appreciate your valuable feedback.





RE: 6Mo vs SDSS for produced water injection pumps
RE: 6Mo vs SDSS for produced water injection pumps
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: 6Mo vs SDSS for produced water injection pumps
API-610 Appendix-G, specifies:-For seawater, produced water, formation water and brine services, the purchaser and the vendor should agree on the construction
materials that best suit the intended use.
DSS & SDSS are listed as materials of construction in Appendix-H, Table-H1.However the chioce for "Super Austenitc" is also provided in the same appendix of API-610.
If you go through the following document(page15 & 16)the choice between 6 Mo and SDSS 2507 is almost close. SDSS is an excellent material with comparable CPT and CCT to that of 6Mo alloy. However properties of cast SDSS 2507 may not be always good. This may influence clients to opt for 6Mo, though cost and materials savings wise it may not be a match for SDSS.
Thanks
http://www.imoa.info/_files/stainless_steel/Duplex...
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario, Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
RE: 6Mo vs SDSS for produced water injection pumps
http://www.nickelinstitute.org/en/TechnicalLiterat...
API 610 actually does not appear to address high alloy austenitics (HAA). Note c to Table H.1 defines the types of 'AUS' steels referred to. ISO 21457 also does not offer HAA as a selection choice.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: 6Mo vs SDSS for produced water injection pumps
Mr. Jones,
If 6Mo is better suited than super duplex at high temperature brine applications, wouldn't that also be the case for oxygen free produced water as well? Or does the added factor of sour service make super duplex the better option?
Thanks,
midris
RE: 6Mo vs SDSS for produced water injection pumps
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.