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Openings in torisperical head

Openings in torisperical head

Openings in torisperical head

(OP)
Torispherical head, tensile strength exeeding 70000 PSI.
Is it OK to use max. stress values as given in tables referenced in UG-23 when nozzle is located in the spherical
Part of head

RE: Openings in torisperical head

Refer to ASME VIII Div 1, clause UG-32(e);-
"Torispherical heads made of materials having a specified
minimum tensile strength exceeding 70,000 psi (500 MPa) shall be designed using a value of S equal to 20,000 psi (150 MPa) at room temperature and reduced in proportion to the reduction in maximum allowable stress values at temperature for the material (see UG-23)".
Cheers,
gr2vessels

RE: Openings in torisperical head

(OP)
Thanks gr2vessels for your answers.
To clarifie my question re. torispherical heads with mts exeeding 70000 psi.
The question is: The head is calculated with S eqal to 20000 psi @room temp redused in......
A nozzle and its reinforcement areas are located within the sperical portion of head.
Can I use stress values as given in tables in UG-23 when
calculating min. thickness "t" of the sperical portion as per UG-37 to calculate required area "A".
UG-37 does not have any note of reduction of S value.
I assume the cause of reduction of S is to prevent buckling of the knuckle area.   

RE: Openings in torisperical head

If I recall correctly, the required thickness of the spherical portion is calculated with the formula for torispherical heads, using M=1. So the limitation on S still holds IMHO.

prex
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RE: Openings in torisperical head

and

specified minimum tensile must EXCEED 70,000  not be 70,000

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