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Nozzle reinforcement calcuation

Nozzle reinforcement calcuation

(OP)
Hi Experts,

I'm a beginner in Pressure vessel design and obviously to asme sec VIII div 1 code.

I have few questions regarding the nozzle reinforcement calculations this is just for my understanding of the code

1. Shell ID= 55 inch
2. Nozzle Dia =30 inch Location: on the Shell
3. Nozzle Dia =30 inch Location: on the head

obviously, 1.& 2. will exceed UG-36(b)(1) requirement and for reinforcement calculation it will consider both UG-37 and App 1-7 as the nozzle is on the shell.

how about 1.& 3. for the reinforcement calculation will clause to be consider, as the nozzle is located on the head.??

(OP)

RE: Nozzle reinforcement calcuation

VesselMan,

See UG-36(b)(1): "... The rules in UG-36 through UG-43 apply to openings not exceeding the following: for vessels 60 in. (1 500 mm) inside diameter and less, one-half the vessel diameter, but not to exceed 20 in... For openings exceeding these limits, supplemental rules of 1-7 shall be satisfied in addition to the rules of this paragraph. Alternatively, openings in cylindrical or conical shells exceeding these limits may be designed for internal pressure using the rules of 1-10 [see (c)(2)(-d)]."

Note that 1-10 is only for openings under internal pressure in cylindrical and conical shells. So for (1) and (2) you could use 1-7 or 1-10 but for (1) and (3) you would only be able to use 1-7.

Hope that helps!

Chris

RE: Nozzle reinforcement calcuation

See UG-36(b)(2) for size limits for nozzles located in heads. There aren't any.

RE: Nozzle reinforcement calcuation

Thanks for the correction TomBarsh. My mistake, you must use UG-37 for heads, not 1-7. Hopefully the title of 1-7 was enough of a heads up of my mistake... "1-7 Large Openings in Cylindrical and Conical Shells."

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