I understand that based on most Plumbing Code requirements that black steel pipe is not permitted on the upstream side of a backflow preventer. If pipe is provided between a flange and the backflow, it should be galvanized.
Do fittings, such as an elbow off the flange, need to also be galvanized?
I'm familiar with the Victaulic orange painted cast-iron grooved fittings (Firelock series) as well as ductile iron flanged fittings that seem to be commonly off of a stub-in flange, but I'm wondering if these need anything special like a painted or galvanized finish?
Thanks in advance - really appreciate the community and expertise here.
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10/21/2020 08:53:17 am
As I have only ever dealt with either Victaulic or have used epoxy lined flanged fittings (pumps), you would need to find documentation from the MFG of other fitting/couplings that their products are approved for use in potable water applications. Something similar to the below link:
10/21/2020 09:05:17 am
In my experience there are many jurisdictions which do not permit galvanized to be on the potable water side of a back flow preventer. In those cases they require it to be either Ductile Iron flanged fittings or Stainless steel.
Thomas G Jones III
10/21/2020 10:39:30 am
Mike, you said exactly what I was going to. From what I hear, galv fittings aren't exactly lead free. Therefore, even though we see it a lot, we will run into a jurisdiction now and then that won't allow it. We use copper instead when running above grade.
10/21/2020 10:53:00 am
In my experience, we usually see flanged ductile, or stainless steel grooved pipe and fittings, which my local AHJ’s allow. Copper allowed, but rarely seen in sprinkler sizes. However some of Victaulic’s galvanized grooved fittings are classified NSF/ANSI 61 – grooved reducer and standard elbow, for example. It gets complicated, I think not all stainless is so-certified. Following.
10/21/2020 04:29:03 pm
That is going to vary from water district to water district. One of our local utility companies only allows cement lined flanged fittings and ductile cement lined pipe before a backflow, and if more than one fitting is used, they won't even allow cement lined flanged fittings. They want MJ fittings ran above ground. It is crazy to see a couple hundred feet of 8" cl. 52. ran in a building, all rodded. Many water departments are going away from galv. fittings, let alone allowing regular painted or black steel fittings. Copper is an alternative, but usually not cost effective when you are dealing with 4" and above sizes.
10/22/2020 10:16:38 am
You're going to want to look to IPC Section 605 for material requirements for water service pipe and fittings. And as Casey said, most jurisdictions will allow only a few options from the tables in that chapter.
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