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External Pressure on a Flat Head

External Pressure on a Flat Head

External Pressure on a Flat Head

(OP)
Are there rules in ASME Sec VIII Div 1 that covers the design of flat heads on a vessel under vaccuum?

RE: External Pressure on a Flat Head

There are no provisions in ASME Section VIII Div. 1 which addresses flat heads under external pressure. U-2(g) applies.

RE: External Pressure on a Flat Head

Yep, what doct9960 said. Here's the official word:

Quote (Interpretation_VIII-1-89-206):

Question (1): Do the requirements for unstayed flat heads in UG-34 of Section VIII, Division 1 apply only to internal pressure?

Reply (1): Yes.

Question (2): Are there any requirements in Section VIII, Division 1 which allow the calculation of minimum thickness for unstayed flat heads under external pressure?

Reply (2): There are no specific provisions which address the condition described; see U-2(g).

jt
 

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