Nubbins - Boiler and Pressure Vessel engineering | Eng-Tips The only gasket I would use a nubbin with is a flat metal Otherwise I design without, and if anybody insists I can then add one without chnging bolting rzrbk is right, some designs will not have "enough" bolting when the nubbin is eliminated I would think they would be a huge pain if re-machining a flange
Nubbin - ASME (mechanical) Code Issues | Eng-Tips A nubbin is just a small tooth obtained by machining on the joint contact area of a flange This is a very detailed issue and is normally specified by joint manufacturers for use with specific types of joints You should find more in a good catalog or site of a joint manufacturer prex motori@xcalcs com
Nubbin on a Body Flange - Heat Transfer Thermodynamics engineering 2) Cost Per Appendix 2 of ASME Section VIII Div 1, machining a nubbin onto the flange gasket surface usually reduces the required bolting area so that fewer (or smaller diameter) bolts can be used Personally I'd recommend against using nubbins if you have a choice -Christine
Tema Type R, confined gaskets, and nubbins 1 - Eng-Tips My specific question is: can I use a 1 8" wide x 1 64" high nubbin on the sealing surface of the flange confined face to reduce the gasket seating stress and thus keep the flanges a reasonable thickness, or does RC-6 31 exclude this possibility? After all, RC-6 31 gives the minimum width of the gasket, NOT the minimum contact width
Effective Gasket Width in ASME VIII-1 App2 Calcs - Eng-Tips Having said that, I have seen a type of arrangement (not often) which uses a nubbin against the outer ring of a spiral wound For this arrangement the calculaton used the loadings for spiral wound portion plus the loadings for a solid metal gasket with a nubbin [A nubbin is as shown in sketch (1c) ]
Appendix 2 Flange Calculations with Nubbins - Eng-Tips Two existing girth flanges are mated together One flange has a nubbin 1 64” high and 1 8” wide The gasket used between the flanges is DJAF iron, that is 1 2” wide Question: When considering the facing on the flanges as Type 2 (per Table 2-5 2, from Sec VIII, Div 1, Appendix 2), the joint is inadequate for the design pressure
Raised Face Flange compared to Flat Face Flange 1 - Eng-Tips Hi I'm trying to compare the dimensions of a CL150 raised face weld neck flange to a CL150 flat face weld neck flange As I am not very familiar with flanges, I am not sure if the dimensions of the two types are different (ie inside outside diameter, hub length, bolt circle diameter, flange