TEMA R : confined gasket
TEMA R : confined gasket
(OP)
Does a CAMM-profile gasket require an outer ring to be confined?
Do I list it under the solid metal gaskets?
Do I list it under the solid metal gaskets?
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RE: TEMA R : confined gasket
For use with piping flanges, I would use the centering ring and would not worry too much about whether it is considered confined or not.
A Kamm (CAMM) profile is a solid metal grooved gasket with a soft facing, typically graphite. I'm not sure what you mean by "list", but it does not use the m & y values of a flat solid metal gasket, but more usually they are supplied by the gasket maker. I have used the values for grooved metal gaskets from Table 2.5-1 in the past to insure more bolting than I would get using the gasket maker's m & Y which are typically pretty low.
Regards,
Mike
RE: TEMA R : confined gasket
It has been a while since I've read TEMA, so I may be wrong.
Confined gaskets, as the name suggests, are gaskets "confined" by grooves (i.e. flanges grooves, pass partition grooves).
Outer rings on Kammprofile gaskets just ensures proper gasket positioning on contact surfaces.
RE: TEMA R : confined gasket
The reason of the confinement is 'blow out' of the seal. I don't see how a camm profile would 'blow out'. Tema however specifically tells you that a solid metal gasket is considered not confined (blow out possible?!). Is a camm profile to be considered under solid metal gaskets or not? Is a camm profile without outer ring confined (inner ring is present and is used to align)?
Hope this clears out my question.
grtz
RE: TEMA R : confined gasket
If using pipe flanges for the body flanges I would add the outer ring more for centering than anything, and would not be too concerned as to whether the gasket was confined.
The TEMA rules are necessarily somewhat general. As for solid metal gaskets exiting the joint, condsider a 72" dia. x 1/4" wide gasket as compared to an 18" dia. x 1" wide. The former might want to be confined.
Regards,
Mike
RE: TEMA R : confined gasket
Spiral wound gaskets confined by grooves are okay for TEMA R, but spiral wound gaskets confined by stud bolts are NOT. Ask your shell and tube heat exchanger manufacturer. They should be able to explain what's required for TEMA R service. Also see page D-20 of the Garlock catalog below to distinguish what's confined and what's not...
h
Kammprofile is not considered a SOLID metal gasket. It is considered a semi-metallic gasket because it has metallic and non-metallic components.
A Kammprofile (whether it has an outer ring or not) is confined if it is contained in a groove. Most of the TEMA R STHE's I've handled (back in the 90's) had the gaskets confined on the OD, usually male-female types. I've never heard of a Kammprofile with inner ring.
RE: TEMA R : confined gasket
I'm unfamiliar with the flange turn. Can you describe what it looks like or do you know if there are sketches available in the web? Can't wait for Monday to borrow TEMA from our heat exchanger guys and have a look at that Fig. RCB 6.5. My long weekend started today. :)
RE: TEMA R : confined gasket
Cheers,
gr2vessels
RE: TEMA R : confined gasket
My long weekend starts today, noon. Happy 4th to all.
Mike
RE: TEMA R : confined gasket
TEMA inquiry # RCB 6.5 (312):
"Will any gasket type which includes an outer metal retaining ring meet the requirements of a "confined gasket" between two raised face flanges, or must the gasket be spiral wound type? For example, would Kammprofile Style ZA or ZG, IDT Style WS3885-DB also qualify as "confined" type?"
TEMA response:
Although TEMA cannot address specific designs or trademark products, any gasket with a solid metal outer retaining ring that prevents a direct radial leak path to the environment in the event of gasket extrusion or 'blowout" meets the intent of the TEMA "confined" joint.
RE: TEMA R : confined gasket
grtz
RE: TEMA R : confined gasket
Thanks, DG72.
Mike