dimensions standard ANSI B16.9 cap (inside crown and knuckle radius)
dimensions standard ANSI B16.9 cap (inside crown and knuckle radius)
(OP)
For a heat exchanger I want to use standard ANSI B16.9 caps. (design acc to ASME VIII)
To check the thickness, I need to know the nominal dimensions of these caps.(inside crown and knuckle radius)
And, is it a (semi) eliptical or thorispherical type?
For the detail design of the heat exchanger, we also want to know more about the fabrication tolerances.
Somebody knows more about the acceptable dimensions?
Thank you for your help,
Denny
To check the thickness, I need to know the nominal dimensions of these caps.(inside crown and knuckle radius)
And, is it a (semi) eliptical or thorispherical type?
For the detail design of the heat exchanger, we also want to know more about the fabrication tolerances.
Somebody knows more about the acceptable dimensions?
Thank you for your help,
Denny





RE: dimensions standard ANSI B16.9 cap (inside crown and knuckle radius)
r = inside knuckle radius
R = inside crown radius
h = Straight flange height
H = total height
DIN 28011
Klöpper bodem, decimal heads acc. (≈torispherical) r = 0,1D
R = D
h ≈ 3,5 x s
H = 0,192D + s + h
DIN 28013
Korbbogen Head 2:1 elliptical
r = 0,154D
R = 0,8D
h ≈ 3 x s
H = 0,251D + s+ h
The ANSI B16.9 looks like the DIN 28013, but I can't find information.
Sombody knows?
grtz Denny
RE: dimensions standard ANSI B16.9 cap (inside crown and knuckle radius)
Regards,
Mike
RE: dimensions standard ANSI B16.9 cap (inside crown and knuckle radius)
RE: dimensions standard ANSI B16.9 cap (inside crown and knuckle radius)
B16.9 does not only specify the thickness at butt welding end. It also gives all required dimensions to form a Cap. Caps shall be ellipsoidal heads and shall conform to ASME BPVC, this is what B16.9 says, please see General Note (b) to Table 10 of ASME B16.9.
Straight flange (or skirt) dimensions are greater for Standard B16.9 caps than usual ellipsoidal heads.
Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN