ASME STP/PT-043

ASME STP/PT-043

ASME FLAWED CYLINDER TESTING

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Scope:
The effect of flaws with and without cyclic loading was investigated on a composite overwrapped pressure vessel with a non-load sharing polymer liner. Flaws were machined in the structure to four depths and then were cycled for 0, I 0,000 and 20,000 cycles. Finally, the cylinders were hydrostatically burst. These data were compared to a reference burst value of a cylinder without flaws or cycles. The cylinder was 406 mm (16 in.) in diameter by 1020 mm ( 40 in.) long with a service pressure rating of 24.8 MPa (3600 psi).

The lowest burst-to-operating pressure ratio was 2.13, which occurred with the flaws cut 40% into the structure and no cycles. Even with the deepest flaw and cycling, the resulting burst pressure margin would allow safe operation of the pressure vessel over a period of time. The lack of significant additional strength loss with cycling gives a degree of confidence that even if flaws are not found immediately, the risk of a fai lure due to the flaw is low.

Organization: ASME International
Document Number: asme stp/pt-043
Publish Date: 2010-12-17
Page Count: 74
Change Type: NEW ADDITION
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Active

Publication Date: 12/17/2010 - Complete Document

Description :

The effect of flaws with and without cyclic loading was investigated on a composite overwrapped pressure vessel with a non-load sharing polymer liner. Flaws were machined in the structure to four depths and then were cycled for 0, I 0,000 and 20,000 cycles. Finally, the cylinders were hydrostatically burst. These data were compared to a reference burst value of a cylinder without flaws or cycles. The cylinder was 406 mm (16 in.) in diameter by 1020 mm ( 40 in.) long with a service pressure rating of 24.8 MPa (3600 psi).

The lowest burst-to-operating pressure ratio was 2.13, which occurred with the flaws cut 40% into the structure and no cycles. Even with the deepest flaw and cycling, the resulting burst pressure margin would allow safe operation of the pressure vessel over a period of time. The lack of significant additional strength loss with cycling gives a degree of confidence that even if flaws are not found immediately, the risk of a fai lure due to the flaw is low.

Document Type : Complete Document

Language : English

Page Count : 74

Publication Date : 12/17/2010

Revision : 10

Status : Current

Title : ASME FLAWED CYLINDER TESTING

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