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Carry Over From API SC6 Winter Meeting API Spec 6A Tensile Test Requirements. Tim Haeberle 30 June 2011. Contents. 1. Clarification Of Spec Reference For Standard Size Tensile Test Specimens

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carry over from api sc6 winter meeting api spec 6a tensile test requirements

Carry Over From API SC6 Winter MeetingAPI Spec 6A Tensile Test Requirements

Tim Haeberle

30 June 2011

contents
Contents

1. Clarification Of Spec Reference For Standard Size Tensile Test Specimens

2. Clarification Of Tensile Test Acceptance Criteria For Mandrel Tubing Hangers And Mandrel Casing Hangers

background
Background

CURRENT 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 6892-1or 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 6892-1or ASTM A370.

Perform a minimum of one tensile test. The results of the tensile test(s) shall satisfy the applicable requirements of Table 6.”

background1
Background

CURRENT WORDING

  • Section 5.6.4.1 (for TC’s for PSL 1)

Paragraph 5 - “Standard-sized, 12,5 mm (0,500 in) diameter tensile specimens shall be used to qualify carbon, low-alloy and stainless steels, unless the physical configuration of the TC prevents their use. In this case, the standard sub-size specimens referenced in ASTM A370 may be used. Either standard 12,7 mm (0,500 in) or standard sub-size specimens (see ASTM A370) may be used to qualify CRA materials.”

  • Section 5.7.4.1 (for QTC’s for PSL 2-4)

Paragraph 6 - “Standard-sized, 12,5 mm (0,500 in) diameter tensile specimens shall be used, unless the physical configuration of the QTC prevents their use. In this case, the standard sub-size specimens referenced in ASTM A370 may be used.”

PROBLEM:

  • These paragraphs do not state that the “standard” specimens are ASTM A370 standard-sized specimens, although they do state that when sub-size specimens are used, they shall be the ASTM A370 standard sub-size specimens. This leaves open the use of ISO 6892-1 standard specimens.
the solution
The Solution

PROPOSED REVISIONS:

  • Section 5.6.4.1

Paragraph 5 - “ASTM A370standard-sized, 12,5 mm (0,500 in) diameter tensile specimens shall be used to qualify carbon, low-alloy and stainless steels, unless the physical configuration of the TC prevents their use. In this case, the standard sub-size specimens referenced in ASTM A370 may be used. Either standard 12,5 mm (0,500 in) or standard sub-size specimens (see ASTM A370) may be used to qualify CRA materials.”

  • Section 5.7.4.1

Paragraph 6 - “ASTM A370standard-sized, 12,5 mm (0,500 in) diameter tensile specimens shall be used, unless the physical configuration of the QTC prevents their use. In this case, the standard sub-size specimens referenced in ASTM A370 may be used.”

Need to fix in both ISO & API versions

the solution1
The Solution

JUSTIFICATION:

  • “ASTM A370” needs to be added to clarify that the only specimen sizes currently permitted are the ASTM A370 specimen sizes.
  • ISO 6892-1 includes different size specimens that have a higher gage length to diameter ratio.
  • The longer relative gage length of the ISO 6892-1 specimens can result in failure to meet the API 6A specified elongation acceptance criteria.
  • The use of ASTM A370 specimen sizes meets ISO 6892-1, since ISO 6892-1, section 6.1.1, paragraphs 7 and 8 state:

“The dimensional tolerances of the test pieces shall be in accordance with the Annexes B to E (see 6.2).”

Other test pieces such as those specified in relevant product standards or national standards may be used by agreement with the customer, e.g. ISO 3183 [1] (API 5L), ISO 11960 [2] (API 5CT), ASTM A370[6], ASTM E8M [7], DIN 50125 [10], IACS W2 [13], and JIS Z2201 [14]”.

  • ASTM A370 specimen sizes are routinely used in the US and Europe.
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API CSOEM SR3 Form
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API Ballot
  • Form ready for submittal
background2
Background

CURRENT 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”.

background3
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 both ISO & API versions

the solution2
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.

Need to fix in both ISO & API versions

api ballot1
API Ballot
  • Form ready for submittal