Gasket with bars - what method of calculation.

[JadalbertWincent]

Hi,
Is any method in ASME Code to calculate gaskets with bars? Or, should I use s. VIII (flanges) and add areas of bars to an area of a gasket? I dont think it will be correct.

 

[SnTMan]

JadalbertWincent, what do you mean by bars?

 

[JadalbertWincent]

Hm. In Europe its (sometimes) means bridges. For ex. gaskets for heat exchangers.

 

[SnTMan]

JadalbertWincent, OK, what I would call pass ribs. Adding the rib / bar area to the area of the ring portion is correct. See, for example in Sec VIII, Div. 1 UHX-4(c). Also see TEMA RCB-11.7, if available. It gives the following for the ribs, for Hp, b*r*m and for Wm2 b*r*Y, b = width or rib, r = length of rib, m, Y gasket factors for rib, which may be different than the ring portion of the gasket.

"r" may be taken to ring portion ID or centerline, "b" is often taken as the effective seating width (as per Table 2.5.2 in Appendix 2) or may be taken as full width N.

Sorry all my refs are to US Codes / Standards, hope you find this helpful.

Regards,

Mike

 

[JadalbertWincent]

Excellent! Thank you. I've found it in ASME Code. Summarizing:
1. for a circular part of a gasket: Wm1=H+Hp; Wm2=3.14*b*G*y
2. for ribs: Hp_=b*r*m; Wm2_=b*r*y
3. Wm1=Wm1+Wm1_; Wm2=Wm2+Wm2_

Thats right?

 

[SnTMan]

JadalbertWincent, looks about right, don't forget the 2*P term for HP_ (ribs).

Regards,

Mike