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# Designing thick circular shells at high temp acc to ASME I PG-27

## Designing thick circular shells at high temp acc to ASME I PG-27

(OP)
Acc to ASME I, if the thickness of the shell is greater than one-half of the inside radius then the calculation should be carried out acc to PG-27.2.3 which says:
The maximum allowable working pressure for parts of boilers of cylindrical cross section, designed for temperatures up to that of saturated steam at critical pressure [705.4°F (374,1°C)], shall be determined by the formulas in A-125.

Does this mean that the formulas in A-125 are only valid if the design temp. is less than 374,1°C?

My design pressure is 107bar and design temp is 535°C, so is it even possible to use ASME I for the design of my "thick shell"?

Thanks

Replies continue below

### RE: Designing thick circular shells at high temp acc to ASME I PG-27

In my opinion you may use the formulae of PG-27.2.2 at temperatures above 374°C even if the thickness is greater than one half the inside radius. This is because the formulae in A-125 will give lower thicknesses for the same data.

prex

http://www.xcalcs.com
Online tools for structural design

### RE: Designing thick circular shells at high temp acc to ASME I PG-27

Agree:See the note in A-125

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