Phenolic resin gaskets
Phenolic resin gaskets
(OP)
Hi,
I have a cotton and phenolic resin gasket with Neoprene adhered to both sides, its full faced. It looks like a brown hunk of resin with a thin sheet of black Neoprene on each side, you can tell its two distinct materials.
I am trying to calculate appropriate bolt loads using ASME Boiler and Pressure Vessel Code, Section 8, Div. 1.
I can not find an appropriate m & y value. Is it just the listing for an elastomer with cotton fabric insertion, or the listing for an elastomer with hardness > Shore 75A? (My gasket is RockwellM 100, which I found equaled Shore 85D, which I found was well above Shore 75A.)
Should I not be using this and instead peruse the PVRC/Tightness method, if I so I run into the same problem of not knowing what materials Gb & Gs value to use.
Any help would be VERY appreciated. Also, any tips in general on how to apply BPVC Section 8 to unknown gasket materials would be so great.
Thanks, long time reader, first time poster!
-Ron
I have a cotton and phenolic resin gasket with Neoprene adhered to both sides, its full faced. It looks like a brown hunk of resin with a thin sheet of black Neoprene on each side, you can tell its two distinct materials.
I am trying to calculate appropriate bolt loads using ASME Boiler and Pressure Vessel Code, Section 8, Div. 1.
I can not find an appropriate m & y value. Is it just the listing for an elastomer with cotton fabric insertion, or the listing for an elastomer with hardness > Shore 75A? (My gasket is RockwellM 100, which I found equaled Shore 85D, which I found was well above Shore 75A.)
Should I not be using this and instead peruse the PVRC/Tightness method, if I so I run into the same problem of not knowing what materials Gb & Gs value to use.
Any help would be VERY appreciated. Also, any tips in general on how to apply BPVC Section 8 to unknown gasket materials would be so great.
Thanks, long time reader, first time poster!
-Ron





RE: Phenolic resin gaskets
1. You don't apply BPVC to unknown gaskets and viceversa, do not use unknown gaskets in pressure vessel design.
2. You must be very sure of the gasket material to attempt matching it with the listed m and Y properties in Table 2-5.1 of Appendix 2.
3. If the gasket material was manufactured by a gasket manufacturer, he should be able to give you the m,Y values tested and guaranteed. Otherwise, how would you ensure a leak free joint? Assuming or hoping?
4. However, if you can ensure the quality of your gasket material is matched with the elastomer with cotton fabric insertion, then use 1.25/400 psi values. The elastomer gasket is a rubber gasket for light duty.
By the way, what are you trying to seal?
Cheers,
gr2vessels
RE: Phenolic resin gaskets
We have a spec sheet from the manufacturer, and it lists mechanical properties such as tensile, compression and flexural hardness. As well as hardness, impact strength, etc. However it does not list m & y values. I have yet to get a reply from the manufacturer on this issue as well, so I'm looking at other methods finding my answer. Is there any way to relate mechanical properties to the m & y values?
I'm new to gaskets, so if possible can you give me an idea of what my options are for this situation?
RE: Phenolic resin gaskets
Cheers,
gr2vessels