API Spec 6A Tensile Test Yield Offset Requirements

Tim HaeberleAPI SC6 2012 Summer Meeting

2GE Confidential and Proprietary Information

GEÓ2010 All Rights Reserved

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

3GE Confidential and Proprietary Information

GEÓ2010 All Rights Reserved

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

5GE Confidential and Proprietary Information

GEÓ2010 All Rights Reserved

End Of Presentation

6GE Confidential and Proprietary Information

GEÓ2010 All Rights Reserved

Backup Slides

7GE Confidential and Proprietary Information

GEÓ2010 All Rights Reserved

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”.