Re: Joining black carbon steel with stainless steel piping

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 416-843-1413 > On Feb 28, 2022, at 4:21 PM

RE: Joining black carbon steel with stainless steel piping

That’s probably why we screw a brass sprinkler into a black iron fitting and only have corrosion on the treads if there is a small leak. Henry Fontana Operations Manager (NYC) Johnson Controls Fire Protection 100 Lighting Way Secaucus, NJ 07094 Cell: 201-210-9873 henry.font...@jci.com -Or

Re: Joining black carbon steel with stainless steel piping

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 cau

RE: Joining black carbon steel with stainless steel piping

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) Jo

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 S

Re: Joining black carbon steel with stainless steel piping

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

Re: Joining black carbon steel with stainless steel piping

A non conductive connection is required as Galvanic corrosion will occur that will locally corrode the steel pipe if it is in contact (electrically) with the more noble, SS pipe. In galvanic corrosion, a circuit is created due to the difference in voltage potential between dissimilar metals. Cur

Re: Joining black carbon steel with stainless steel piping

Food for thought... https://www.eng-tips.com/viewthread.cfm?qid=351636 On Mon, Feb 28, 2022 at 8:30 AM Fpdcdesign via Sprinklerforum < sprinklerforum@lists.firesprinkler.org> wrote: > > > > The last dielectric joint I saw was a 9” piece of CPVC > > > > > > > > > > > > > > On Feb 28, 2022 at 11:

Re: Joining black carbon steel with stainless steel piping

The last dielectric joint I saw was a 9” piece of CPVC > > On Feb 28, 2022 at 11:22 AM, (mailto:sprinklerforum@lists.firesprinkler.org)> wrote: > > > > Craig, From literature I have, SS has an anodic index of approximately 0.60 > V while plai

Re: Joining black carbon steel with stainless steel piping

The dielectric or something else is needed for dissimilar metals. If the galvanizing was an issue with black steel pipe, wouldn’t it be an issue with the pipe it was applied to? As such, I do not see an issue. Travis Mack, CFPS, CWBSP, RME-G, COC, SET Senior Engineering Manager MFP Design 4

RE: Joining black carbon steel with stainless steel piping

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 an

Re: Joining black carbon steel with stainless steel piping

Victaulic used to sell Dielectric spools we used to use to connect to copper. That used to be the cheapest way to convert. Might be something on Vic’s Mechanic side. Sent from my iPhone > On Feb 28, 2022, at 8:07 AM, Prahl, Craig/GVL via Sprinklerforum > wrote: > > I've got a engineer aski

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 connect