Need help identifying strange fitting

[SwinnyGG]

Greetings piping crew,

Working on installing some equipment for a client, and the equipment as delivered does not match the product info we were provided, and I'm running into strange fittings I've never seen before. The equipment was procured by my client through a French company, and various pieces were built in either France or Italy.

These are similar to a BSPP or ORFS fitting - but instead of an o-ring & groove,, the female fitting contains a PTFE washer with a very small groove cut in it. The male fitting provided is a butt weld schedule 10 stainless fitting with a flat face to mate with the PTFE ring, but the flat face has a very small full-perimeter 'ridge' to engage with the groove in the PTFE washer. If I pull the nut back on the female end and remove the washer, the end of the line has a flange to capture the nut, and the flat face (which would be on the back side of the PTFE ring) also has the full-perimeter 'ridge'.

Hoping for some help in identifying the standard used here so I can procure caps for these fittings to pressure test, and for some other needs.

 

[LittleInch]

So is the washer like an H section in Cross section?

What's the pressure rating?

 

[ghostdigital]

What is the fluid in the pipe? I'm wondering if this is a compatibility centric application.

 

[SwinnyGG]

So is the washer like an H section in Cross section?

What's the pressure rating?

Yes, the washer is almost an H in cross section. The groove in the center is present on both sides. Relative to the overall thickness of the washer, the groove is very shallow and narrow. Washer is roughly 2mm thick and 2mm wide, the groove is maybe 0.25mm x 0.25mm

I don't know the pressure rating of the fitting - but it's welded to a run of some metric SS pipe of an unknown alloy with dimensions very close, but not exactly the same, as Sched 10S.

What is the fluid in the pipe? I'm wondering if this is a compatibility centric application.

He Gas.

 

[XL83NL]

Do you have a picture (or more than 1) from a different angle?

 

[LittleInch]

So the white bit is the ptfe seal?

Nearest I can find is a BSPT faltface union,.

The groove just looks like an extra to compass the ptfe a bit more given that it's Helium, but if you just want an end for testing a flat face will be more than good enough.

 

[SwinnyGG]

The white ring is PTFE, yes.

My concern with using a flat face to cap these is destroying the small ridge on the mating face. These are high pressure connections.

Appreciate the help from everyone who responded - I was able to figure these out; most of these weren't marked but we found one in the whole system that was buried but had a laser marking on the gland when we pulled it apart. Turns out they are a proprietary fitting made by a French company called DMD Inox.

As far as we can tell we can't get them in the US and the client is concerned about future service/spares so we are likely going to cut them all off and replace them with stainless ORFS fittings instead.

Catalog for anyone still following. Polish up your French before you open this.

http://www.dmdinox.com/PDF_2017/RSR.pdf