Ring Joint Gaskets 1

[mel124]

Hello Every one,
could you please give me information about the ring joints gaskets:
- why and when is suggested their utilization;
- which are the referential standards;
- general theory about their construction, different styles ...;
- applications.
Thanks in advance
Mel124.

 

[pennpiper]

Ring Joint Gaskets are required and only used for Ring Joint Flanges. They are employed in production and refining process of oil and chemical industries.

Ring Joint Gaskets are produced from different solid metal types. They are used to stand high pressure and temperatures and they are employed where corrosive agents are present. These gaskets are obtained by mechanical working from forged or laminated metals in one single piece.

Ring Joint Gaskets are strictly manufactured to API-6A/ASME B16.2 specifications.

Ring Joint Gaskets shall be either octagonal or oval in cross section and identify by R, RX or BX number that relates to flange size (NPS), pressure class and appropriate flange standards.

 

[unclesyd]

In addition to the above information here is the Woodco website. This is an excellant site for information about Ring Joint flanges and gaskets.

http://www.woodcousa.com/ring_select.htm

 

[mel124]

Dear sirs,
thanks a lot. Your suggestions have been very helpfull for me.

mel124

 

[Ashereng]

Are RTJ also common in steam service?

I seem to recall so, but haven't a lot of experience in steam.

"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

 

[unclesyd]

The majority of our 300# steam and all the 600# steam lines use RTJ flanges.

Our extensive vaporized oil heating system is all RTJ flanges even though it is only 70# @ 700F.

 

[mel124]

The BX style when is suggested, and which is the holes' function ?
Which are the differences with the RX style ?

Thanks

 

[Cockroach]

I use ASME B16.5-2003 as the standard for pipe flanges and flanged fittings. Table F5 gives all the gland geometries for R type rings complete for NPS 1/2 through to 24, metric and inch standard.

As a side note, the R type rings are metal seals directly on the flanks of the donut. BX type glands completely enclose the ring and butt up to the raised face of the flange. The difference is in make-up forces creating the seal due to stud/nut torsion at the flange.

R type glands are typical of the valve industry, BX is more wellhead application.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

 

[11echo]

One of the problems I find using ring joint flanges here in the oil fields. That "some" of the old types still exist out here. And when I say "old type" I mean the oval shape type. Now you can mix up an Oval flange with a Hex flange ring gasket IF you use oval shaped ring joint gaskets. But you can't use the newer Hex shape gasket. The problem now is this is pretty "standard" procedure ...when ordering ring joint gasket they are pretty much all oval shaped. They do work, but the dimension between the two flanges now changes ...only slightly, and it can cause problems with fitting make-up in tight areas.