SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
(OP)
Doesn't seem right.
I've field-checked several 6" and smaller lines that have been pre-fabricated and staged (but not installed yet), and all the pipe material is non-magnetic. All the fittings that I've checked are non-magnetic. Spec calls for Stainless steel.
But the filler material is magnetic. Doesn't seem right that the filler material should attract a magnet that way.
I've field-checked several 6" and smaller lines that have been pre-fabricated and staged (but not installed yet), and all the pipe material is non-magnetic. All the fittings that I've checked are non-magnetic. Spec calls for Stainless steel.
But the filler material is magnetic. Doesn't seem right that the filler material should attract a magnet that way.





RE: SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
If this is a very strong attraction before you go any further if possible you need to check the electrodes used in the fabrication of the pipe spools in case of a mixup.
Can you come back with the materials and welding process as each can contribute to the ammount of Ferrite present in a weld deposit.
I would also check with the client to check whether Ferrite is permissible in the inteneded service.
Also the intended application with details.
RE: SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
Fittings are mostly socket weld and RFSO. Reading the stamps and etchings, they are a mix of both 316 and 304 SStl.
RE: SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
Don't do this on your pipe but if you heat magnetic material to rosy red and cool the magnetic properties go away.
You will also see magnetic properties on cold worked Austenitic SS.
If you can get the MTR report on the welding electrodes it might have a FN number listed. If there is no FN anything goes. There is also a relatively inexpensive Ferrite meter that will give you a ballpark number, generally acceptable, for any weld.
RE: SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
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Plymouth Tube
RE: SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
Service is demineralized cooling water to the generator, moderate temps (well under 120 degrees) at modest pressures.
RE: SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
We have literally miles of SS piping carrying Demin and pure water that run all over the site. It was all welded and I don't think there was any concern about the welding other than meeting the piping specs.
RE: SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
RE: SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: SStl Pipe, SStl (SW + Bell End) Fittings, Magnetic Weld Material
While biologics are not exactly irrelevant, they are not a concern so long as pure water flows when the generator is at power.