I am not an expert on this topic. However, I was told the key was corrosion mainly occurs when water flows on a regular basis. With water flowing on a regular basis, corrosion becomes a larger concern.
John August Denhardt, P.E. Vice-President Engineering and Technical Services American Fire Sprinkler Association 301-343-1457 Begin forwarded message: > From: Ken Wagoner via Sprinklerforum <[email protected]> > Date: February 28, 2022 at 1:59:28 PM EST > To: [email protected] > Cc: Ken Wagoner <[email protected]>, "Prahl, Craig/GVL" > <[email protected]>, "Hinson, Ryan" <[email protected]> > Subject: Re: Joining black carbon steel with stainless steel piping > Reply-To: [email protected] > > Craig, > > I would ask the question of the engineering staff over at Ames. The number of > their stainless steel in-building risers I've seen has been astounding, and > they primarily connect to a black steel riser. > > I would wager there's been some investigation on their part of that issue. > > sincerely, > *Ken Wagoner, SET* > *Parsley Consulting > 500 West Mechanic Street > Harrisonville, Missouri 64701-2235* > *Phone: (760) 745-6181 * > *Visit the website > <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.parsleyconsulting.com%2f&c=E,1,Y5zKJKPEh1mBEBqSR-VE9cUKl5y-eyP8BpvmE_5j9ZqW2eJbNphYzrCMBZ-2YuX6d-RRkHI4gQ1FV-cvOeCfRC58uZS9NiToZv2mx7909oCqLvCW_n5hDHeK&typo=1>* > >> On 2/28/2022 10:21 AM, Hinson, Ryan via Sprinklerforum wrote: >> Craig, >> >From literature I have, SS has an anodic index of approximately 0.60 V >> >while plain CS has that of 0.85 V. >> If the environment in which the joint is located is 'normal' or >> 'controlled', you shouldn't have a galvanic compatibility issue. If the >> environment is considered 'harsh', the anodic index delta must be smaller >> (approximately 0.15 V) in which case, some sort of dielectric >> fitting/sacrificial anode would be needed for joint longevity. >> >> As I am not an expert, I suggest reaching out to someone such >> aswww.corrosion-doctors.org for more assistance. >> >> Hope this helps, >> >> Ryan L. Hinson, PE*, SET** \ Burns & McDonnell >> Senior Fire Protection Engineer >> O 612-900-3755 \ M 763-688-4045 \ F 952-229-2923 >> [email protected] \ burnsmcd.com >> 8201 Norman Center Drive, Suite 500 \ Minneapolis-St. Paul, MN 55437 >> *Registered in: AK, LA, MD, MN, PA, TX, & UT >> **NICET IV - Water-Based Systems Layout >> >> >> >> -----Original Message----- >> From: Sprinklerforum<[email protected]> On >> Behalf Of Prahl, Craig/GVL via Sprinklerforum >> Sent: Monday, February 28, 2022 10:06 AM >> To:[email protected] >> Cc: Prahl, Craig/GVL<[email protected]> >> Subject: Joining black carbon steel with stainless steel piping >> >> I've got a engineer asking about the joining of grooved stainless to grooved >> black carbon steel and if there needs to be a special dielectric or similar >> type of assembly used to join the two? >> >> I've been hunting on the interwebs and haven't found any type of special >> coupling or should the connection be flanged? >> >> In all my years this is the first time this subject has ever come up. >> >> Craig Prahl | Jacobs | Group Lead/SME - Fire Protection >> |[email protected] >> |https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jacobs.com%2F&data=04%7C01%7Crhinson%40burnsmcd.com%7C2d6969ca91d4441ae22908d9fad44781%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C0%7C637816612359587927%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=ln%2Ffq9qqoz%2FALwILLnsYh4I62399EES0Jp16yw6U%2FvU%3D&reserved=0 >> 1041 East Butler Road Greenville, South Carolina 29606 >> CONTACT BY: email or MS TEAMS >> >> >> ________________________________ >> >> NOTICE - This communication may contain confidential and privileged >> information that is for the sole use of the intended recipient. 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