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ASME STP/PT-043
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ASME STP/PT-043 2010 Edition, December 17, 2010 ASME FLAWED CYLINDER TESTING
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Description / Abstract:
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.
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.