That can be if corrosion buildup adheres to the steel and creates a pacifying layer. When it is scrubbed off, new metal is exposed and corrosion is faster.
Gary Howard, P. Eng., Consulting Engineer ghowar...@gmail.com <mailto:ghowar...@gmail.com> 416-843-1413 > On Feb 28, 2022, at 4:21 PM, John Denhardt via Sprinklerforum > <sprinklerforum@lists.firesprinkler.org> wrote: > > I understand Henry. But I did a lot of copper systems in my earlier days. > I remember seeing corrosion on typical copper/galvanized steel > plumbing systems but not on steel/copper sprinkler systems. I asked why. > I was told by a seasoned engineer, the water must be flowing through the > systems to cause a major issue. The statement to me was, since sprinkler > water is static, very little corrosion occurs. ????? > > *The above is my opinion and has not been processed as a formal > interpretation in accordance with the NFPA Regulations Governing Committee > Projects. This is provided with the understanding that the AFSA assumes no > liability for this opinion or actions taken on it and they are not to be > considered the official position of the **AFSA, and/or NFPA or its > technical committees.**AFSA cannot provide design or consulting engineering > services, and this opinion should therefore not be considered, nor relied > upon, as such.* > > Thanks, > John > > John August Denhardt, PE > *Vice President, Engineering and Technical Services* > > *American Fire Sprinkler Association* > m: p: 301-343-1457 > 214-349-5965 ext 121 > w: firesprinkler.org > <https://www.facebook.com/firesprinkler.org/> > <https://twitter.com/afsa/status/1039528345367732224> > <https://www.linkedin.com/company/american-fire-sprinkler-association-afsa-/> > <https://www.instagram.com/firesprinklerorg/> > > *Our members are at the heart of everything we do.* > > > *Expand your business with ITM.* > > Professionalize the role of your inspection team with AFSA’s comprehensive > 20-month ITM Inspector Development program > <https://www.firesprinkler.org/itm> that provides a blended learning > environment teamed with robust curriculum created by top industry leaders. > Now enrolling for Spring 2022! > > > On Mon, Feb 28, 2022 at 4:02 PM Henry Fontana <henry.font...@jci.com> wrote: > >> 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 >> henry.font...@jci.com >> >> >> -----Original Message----- >> From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On >> Behalf Of John Denhardt via Sprinklerforum >> Sent: Monday, February 28, 2022 2:48 PM >> To: <sprinklerforum@lists.firesprinkler.org> < >> sprinklerforum@lists.firesprinkler.org> >> Cc: John Denhardt <jdenha...@firesprinkler.org> >> 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 >>> <sprinklerforum@lists.firesprinkler.org> >>> Date: February 28, 2022 at 1:59:28 PM EST >>> To: sprinklerforum@lists.firesprinkler.org >>> Cc: Ken Wagoner <k...@parsleyconsulting.com>, "Prahl, Craig/GVL" >>> <craig.pr...@jacobs.com>, "Hinson, Ryan" <rhin...@burnsmcd.com> >>> Subject: Re: Joining black carbon steel with stainless steel piping >>> Reply-To: sprinklerforum@lists.firesprinkler.org >>> >>> 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 >>>> rhin...@burnsmcd.com \ 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<sprinklerforum-boun...@lists.firesprinkler.org> >>>> On Behalf Of Prahl, Craig/GVL via Sprinklerforum >>>> Sent: Monday, February 28, 2022 10:06 AM >>>> To:sprinklerforum@lists.firesprinkler.org >>>> Cc: Prahl, Craig/GVL<craig.pr...@jacobs.com> >>>> 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 | >> craig.pr...@jacobs.com | >> 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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