ASME Sec. IV HF-301 minimum thickness requirement

[Lukasz1]

Hello

I have a question to ask.

Acc. to ASME Sec. IV HF-301.1 requirement, any ferrous plate, or pipe used in lieu of plate, under any pressure shall be 1/4in (6mm).

In point a) and b) of this same requirement we can find some exceptions but they don't apply to my design because my maximum pressure will be 160 psi.

I would like to ask if this mean that i have to use minimum 6mm thickness for every pressure bearing part inc. "nozzles" and "shells"?

Thank you for your help.

Lukasz

 

[vpl]

Lukasz1

I would take it that the initial plate or pipe from which you fabricate the nozzle or shell has to be the minimum 1/4" or 6mm, unless HF203 applies.

But I could be wrong, as I don't normally work with Section IV.

Patricia Lougheed

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[Lukasz1]

Thank you for the reply.

I just want to make sure that HF-301.1 minimum thickness requirement also apllies to shells and nozzles. This are parts which can easily by calculated.

For example: why i should use min. 1/4" thickness for 2-1/2" nozzle made from pipe?

For nozzles i think that HF-203.3 requirement may apply but i am not sure of that. Need to speak with our AI first.

Lukasz

 

[GenB]

Ferrous Plates The minimum thickness of any ferrous
plate used under pressure shall be in. (6 mm). If any pipe is
used instead of a plate, the pipe’s thickness shall also be in.
(6 mm). Exception to the minimum thickness is permitted in paragraphs
HF-301.1(c) and (d). The minimum allowable thickness of
ferrous shell plates, tubesheets, and heads for various shell diameters.
for shells, headers and tubesheets.
check if you ahve to use 1/4 pipe + the 12.55 undertol-allowance, the you have to jump to 5/16th t. pipe