1. API Spec 6A Tensile Test Yield Offset Requirements
Tim Haeberle
API SC Summer Meeting

2. Need to fix in API version
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

3. The Solution PROPOSED REVISION:
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 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

5. End Of Presentation

6. Backup Slides

7. Background CURRENT WORDING
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 or ASTM A370.
Perform a minimum of one tensile test. The results of the tensile test(s) shall satisfy the manufacturer’s specified requirements.”
PSL 2 to 4 tensile testing (for bodies, bonnets, and end and outlet connections)
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”.