api spec 6a tensile test yield offset requirements

API Spec 6A Tensile Test Yield Offset Requirements

Tim HaeberleAPI SC6 2012 Summer Meeting

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Background

PROBLEM:• The yield strength acceptance criteria for bodies, bonnets, and

end and outlet connections is limited to the 0,2% offset method yield strength values in Table 6. This is good!

• However, for mandrel hangers it is up to the manufacturer to specify not only the yield strength in MPa (psi), but also the method of determining the yield strength.

• Unfortunately, if the manufacturer does not specify the method of determining the yield strength, methods other than the 0,2% offset method may be used, and these may give higher or lower values than would be obtained if the 0,2% offset method were used.

Need to fix in API version

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The Solution

PROPOSED REVISION: • 5.3.5.2 PSL 2 to 4 tensile testing (for mandrel tubing hangers

and casing hangers)“b) test method:

Perform tensile tests at room temperature in accordance with the procedures specified in ISO 6892-1 or ASTM A370. Perform a minimum of one tensile test. The results of the tensile test(s) shall satisfy the manufacturer’s specified requirements. The 0,2% offset method shall be used for determination of the yield strength”.

JUSTIFICATION:• A standardized method of determining the yield strength needs

to be used for mandrel casing and tubing hangers.

4

API Ballot

• Ballot ready for SC6 to approve at the 2012 Summer Meeting for formal balloting

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End Of Presentation

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Backup Slides

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BackgroundCURRENT WORDING• 5.3.5.2 PSL 2 to 4 tensile testing (for mandrel tubing hangers and

casing hangers)“b) test method:

Perform tensile tests at room temperature in accordance with the procedures specified in ISO 6892-1 or ASTM A370.Perform a minimum of one tensile test. The results of the tensile test(s) shall satisfy the manufacturer’s specified requirements.”

• 5.4.2.3 PSL 2 to 4 tensile testing (for bodies, bonnets, and end and outlet connections)

“b) test method:Perform tensile tests at room temperature in accordance with the procedures specified in ISO 6892-1 or ASTM A370.Perform a minimum of one tensile test. The results of the tensile test(s) shall satisfy the applicable requirements of Table 6.”

• API 6A Table 6, column 2 (for bodies, bonnets, and end and outlet connections)“0,2% offset yield strength”.