S-G-03–Specifications for the approval of type of gas metering devices–Revisions

Category: Gas
Issue date:
Effective date:
Revision number: 3
Supersedes: S-G-03 (rev. 2)


Revisions

The purpose of revision 3 was to:

  • recognize the ISO 6976 standard and update the relevant sections (Introduction, section 4.0; Part 14, sections 4.3 and 4.4; Part 16, section 4.1).
  • move the dry air density requirement (previously in Part 1, section 7.3.2) to Part 2, as a footnote in section 3.1.

The purpose of revision 2 was to make the following amendments:

  • General amendments:
    • Reformat the document to conform to publishing requirements.
    • Create the new introduction and definitions sections.
    • Integrate all approval requirements for electronic gas metering devices incorporating mass to base volume and/or energy conversion functions (Part 14). These requirements were in S-G-07.
    • Remove appendices A and B.
    • Fix a few typos.
    • Revise the terminology and definitions.
    • Eliminate the duplication of requirements which were already in Part 1.
    • Remove all performance test sections, now that test conditions and applicable performance tests are available on request.
    • Rearrange the order of some Parts.
  • Amendments to Part 1:
    • Make references to the last edition of GPA2145-16, GPA 2172-14 and AGA Report No. 8.
    • Introduce the notion of energy on a mass basis as well as associated requirements.
    • Introduce the net-metering measurement as well as associated requirements;
    • Add requirements for calorific value units, verification markings and modular design meter markings, as well as indicating requirements.
  • Amendments to Part 2:
    • Remove the maximum permissible error (MPE) for non-temperature compensated meters which MC does not approve.
  • Amendments to Part 5:
    • Rework this part to reflect that only one component (i.e. orifice fittings) of a primary element of an orifice meter is approved by MC.
    • Replace AGA Report No. 3, Part 2 (Fourth edition, 2000) by AGA Report No. 3, Part 2 (Fifth edition, 2016).
  • Amendments to Part 6:
    • Change the tolerances for the repeatability.
    • Use the weighted mean error (WME) instead of the maximum peak-to-peak error.
  • Amendments to Part 7:
    • Integrate all approval requirements from PS-G-06.
    • Change the tolerance of ± 0.1% in subsection 3.4.
  • Amendments to Part 9:
    • Define the flow rate characteristics by Reynolds number.
    • Add marking requirements for material or thermal expansion coefficient.
  • Amendments to Part 15:
    • Change "mechanical indicating devices" to "mechanical registers".
    • Move requirements of proving provision in Part 1.
    • Rework the requirements in subsection 4.2 (i.e. capacity).
  • Amendments to Part 16:
    • Migrate to a % tolerance for calorific value (energy density) and expand the MPE from ±0.5% to ±0.7% for relative density.
    • Incorporate repeatability limits for gas components below 25 mol %, to be in line with limits used at verification/reverification.
  • Amendments to Part 17:
    • Align terminology (e.g. unit price, price to be paid) with OIML terminology;
    • Add the MPE for gas flow meters only;
    • Add maximum value of the MMQ depending on the type of applications (i.e. standard, heavy-duty and bulk applications);
    • Revise requirements for the systematic deviation (i.e. hose pressure/compensation);
    • Remove requirements for the adjustment range (less or greater than 2%);
    • Add requirements for transfer points.
  • Amendments to Part 20:
    • Add requirements for calorific value determining devices and apply the same MPE as Part 16 for calorific value and relative density.
    • Adjust the requirement for the range of relative density in subsection 4.3.
  • Amendments to Part 21:
    • Change the metrological requirement (i.e. improvement of half the MPE) to a technical requirement (i.e. demonstrate improvement of the accuracy of the meter installed with a flow conditioner).
  • Amendments to Part 22:
    • Rename that section.
    • Add the metrological requirements that were in the original version of PS-G-16 and were forgotten during revision 1 below.
  • Appendix A:
    • Change symbol K' to K in Equation A.5.

The purpose of revision 1 was to:

  • integrate the requirements of LMB-EG-08—Specifications for approval of type of gas meters and auxiliary devices into these specifications. Therefore, LMB-EG-08 has become obsolete;
  • consolidate and communicate all the applicable approval requirements that have changed over the years and are currently applied during type approval evaluation;
  • attempt to harmonize Canada's approval requirements with OIML recommendations;
  • integrate approval requirements for fluidic oscillation meters, conditioning orifice plates, flow conditioners and cone-shaped differential pressure meters;
  • integrate requirements for the approval of correction devices and linearization functions incorporated in meters and flow computers;
  • reformat these specifications according to new formatting requirements.

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