Api spec 10a
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API Spec 10A PowerPoint PPT Presentation

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API Spec 10A. June 25, 2013. Changes to API Spec Q1 8 th Edition to 9 th Edition (Effective June 2013). Involves a complete re-write of Q1 No longer a mirror copy of ISO Introduction of major changes will be done by Bill Ulrich. Mineral Oil being used (Jim Davidson).

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API Spec 10A

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API Spec 10A

June 25, 2013

Changes to API Spec Q1 8th Edition to 9th Edition (Effective June 2013)

  • Involves a complete re-write of Q1

  • No longer a mirror copy of ISO

  • Introduction of major changes will be done by Bill Ulrich

Mineral Oil being used (Jim Davidson)

From API Spec 10A, Sec 10, part 10.1 Apparatus

  • The space between the slurry container and the walls of the pressure vessel shall be completely filled with a hydrocarbon oil. The selected oil shall have the following physical properties:

  • ⎯ viscosity range: 6 mm2/s to 79 mm2/s at 38 °C (100 °F) or 6 cSt to 79 cSt at 38 °C (100 °F); or 45 SSU to 360 SSU at 38 °C(100 °F);

  • ⎯ specific heat: 1,9 kJ/(kg⋅K) to 2,5 kJ/(kg⋅K) (0,45 Btu/lb⋅°F to 0,60 Btu/lb⋅°F);

  • ⎯ thermal conductivity: 0,112 W/(m⋅K) to 0,138 W/(m⋅K) [0,065 Btu/(h⋅ft2⋅°F/ft) to 0,08 Btu/(h⋅ft2⋅°F/ft)];

  • ⎯ specific gravity: 0,83 to 0,93.

Annex B change required

  • Annex B requires that mass be reported in US Customary units (pounds) but is contradictory

  • B.4.2 Units

    As a minimum, product should be marked with U.S. customary (USC) units. Use of dual units [metric (SI) units and USC units] is acceptable.

  • B.4.3 Markings

    b) net mass (in U.S. customary (USC) units)

  • API does not enforce when auditors note a violation

  • Committee recommends that mass be reported in the local country of origin’s units

  • ANNEX B also is not a part of ISO 10426-1

Auditor Findings of Problems with API 10A

  • a) Clause 7.1.4 - the accuracy and calibration frequency of the mixer's time is not included.

  • b) Clause 7.2.2 - the calibration frequency of the temperature measuring device is not included.

  • c) Figure 7 - the sketch shows a type I class 1 narrow-mouth flask instead of a type I class 2 wide-neck flask required by clause 8.1.3.

  • d) Clause 9.3.2 - why measure the dimensions of the test faces of the compressive strength specimens to +/- 1.0 mm to use to calculate the cross sectional area if it will not be different from the 50.0mm x 50.0mm nominal dimensions.  If it's considered good practice to use actual measurements to calculate the cross sectional area then the test faces should be measured to +/- 0.1 mm or +/- 0.01 mm (which most labs are doing anyway).

Auditor Findings of Problems with API 10A

  • e) Clause 9.3.3 - one of the rate of loadings needs to include the strength when it equals 3.4MPa - one is greater than 3.4 MPa and the other is less than 3.4.

  • f) Clause 9.4 - the calculated compressive strengths of test samples and their average are to be rounded to the nearest 50kPa, i.e. 0.05MPa, however, all the acceptance limits have a least significant digit of 0.1MPa. This could lead to actual results being rounded twice to bring them into specification; for example, for a Class G 38C cured specimen with a calculated strength of 2.04234... MPa it will be rounded to 2.05MPa which does not meet the 2.1 MPa minimum value.  However, it is convention practice in the determination of compliance with a specification limiting value to round the observed or calculated value to same number of significant figures as that of the specification, i.e. 2.05MPa can be rounded to 2.1 MPa and now passes.  Note; this could not be done if the MPa compressive strength minimum limits had another zero added to them, i.e. 2.05 MPa should not be rounded to satisfy a 2.10 MPa limit.  I feel that the rounding practice defined by ASTM E29 should used, as applied by ASTM C114.

Auditor Findings of Problems with API 10A

  • g) Clause 10.2.3 - why are temperature calibration requirements for the pressurized consistometer so different from that of the atmospheric consistometer in clause 8.2.1? 

  • h) Clause 10.2.5 - why is the calibration frequency for the pressurized consistometer annual and that of the atmospheric consistometer quarterly?

  • i) Clause B.4.3b - why is the net mass to be in US customary units if the cement is made and sold outside of the US?  This requirement is not being enforced by API anyway as I wrote this one up as a nonconformity a while ago but it was cancelled.

  • j) Clause 10.2.3 requires temperature measurement to be calibrated to ± 2°C, however, clause 10.3.4 requires the temperature to be within ± 1°C 10 minutes after the end of the ramp.

Auditor Findings of Problems with API 10A

  • 10A has no clear requirements for the qualification of 'rapid' chemical analysis methods and analysts when EN standards are only used

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