John you are correct. You need three things for corrosion to happen a cathode (one metal), an anode (a second metal), and an electrolyte. Without water you have no electrolyte their for no corrosion. So if this system is dry then you have no issue.
Henry Fontana Operations Manager (NYC) Johnson Controls Fire Protection 100 Lighting Way Secaucus, NJ 07094 Cell: 201-210-9873 [email protected] -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of John Denhardt via Sprinklerforum Sent: Monday, February 28, 2022 2:48 PM To: <[email protected]> <[email protected]> Cc: John Denhardt <[email protected]> Subject: Fwd: Joining black carbon steel with stainless steel piping 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://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flin > kprotect.cudasvc.com%2Furl%3Fa%3Dhttp%253a%252f%252fwww.parsleyconsult > ing.com%252f%26c%3DE%2C1%2CY5zKJKPEh1mBEBqSR-VE9cUKl5y-eyP8BpvmE_5j9Zq > W2eJbNphYzrCMBZ-2YuX6d-RRkHI4gQ1FV-cvOeCfRC58uZS9NiToZv2mx7909oCqLvCW_ > n5hDHeK%26typo%3D1&data=04%7C01%7CHenry.Fontana%40jci.com%7Cfa007e > 4b1cc24a8f19aa08d9faf33eb9%7Ca1f1e2147ded45b681a19e8ae3459641%7C0%7C0% > 7C637816745050436909%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQI > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=E2bdQ2HHaH0 > C1AmYPNjaVBNxu3d20bIjkNGXtAedvUI%3D&reserved=0>* >> 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 >> ashttps://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.corrosion-doctors.org%2F&data=04%7C01%7CHenry.Fontana%40jci.com%7Cfa007e4b1cc24a8f19aa08d9faf33eb9%7Ca1f1e2147ded45b681a19e8ae3459641%7C0%7C0%7C637816745050436909%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=4R8R1%2BUeMlOKl1XIVT8WXoUxSH0wGOb33%2BJjFy%2FJEhc%3D&reserved=0 >> 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://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jacobs.com%2F&data=04%7C01%7CHenry.Fontana%40jci.com%7Cfa007e4b1cc24a8f19aa08d9faf33eb9%7Ca1f1e2147ded45b681a19e8ae3459641%7C0%7C0%7C637816745050436909%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=AhEUvbWtufk4TAbwDO9jOJgwm0x4EAyPfa%2FFCPXg7xc%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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