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PS-G-08 Provisional Specifications for Approval of Type of Gas Meters and Auxiliary Devices (an amendment to section 20 of LMB-EG-08: 1987)

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1.    Scope

These specifications apply to meters and auxiliary devices submitted for approval of type pursuant to section 9 of the Electricity and Gas Inspection Act and section 20 of Measurement Canada publication LMB-EG-08: dated 1987 Specifications for Approval of Type of Gas Meters and Auxiliary Devices.

2.    Authority

These specifications are issued under the authority of section 12 of the Electricity and Gas Inspection Regulations.

3.    Definitions

Calorific Power: is the number of energy units per unit of volume at a certain temperature and certain pressure. Calorific power is more appropriately known as Energy Density or Heating Value. It is expressed in Btu/ft³ in the Imperial System of Units (IMP) or in MJ/m³ in the International System of Units (SI).

4.    Amendments

Section 20 of LMB-EG-08: 1987 is amended as follows:

4.1 Section 20-3.1 is replaced by the following:

20-3.1 Nameplate. In addition to the requirements set out in subsection 3-5, the following information shall be marked on or be capable of being displayed by the device:

(a) type and range of auxiliary output signal* (if provided);

* An auxiliary output signal is one which is intended to supply information to an auxiliary device other than a dedicated recorder intended for use with the chromatograph.

(b) The recognized standard used by the device in calculating the energy value from the gas composition;

(c) Where a device provides an indication of energy in the Imperial System of units:

1. the particular British Thermal Unit displayed (eg. Btu_(60.5), Btu_(IT), Btu₍₅₉₎);
2. the base temperature and pressure used in establishing the calorific power.

4.2 Section 20-4.1 is replaced by the following:

20-4.1 Tests at Reference Conditions. The chromatograph shall be set up and calibrated according to the manufacturer's instructions. Unless the operating range is otherwise specified by the manufacturer, the chromatograph shall be tested using gases of known composition which may contain any or all of the components set out below with concentrations within the stated ranges. If different ranges are specified by the manufacturer, the device shall be tested using samples of known concentration within the specified ranges.

Where one of the above components is used as a carrier gas in the chromatograph under test, the concentration of that gas in the test sample shall not exceed 0.04 mol %.

The true calorific power and relative density of the sample gas shall be calculated using the true relative concentrations of all components of the sample gas as established in accordance with the Gas Processors Association standards, Calculation of Gross Heating Value, Relative Density and Compressibility Factor for Natural Gas Mixtures from Compositional Analysis, GPA 2172 and Table of Physical Constants for Hydrocarbons and Other Compounds of Interest to the Natural Gas Industry, GPA 2145.

Where a device provides calorific power and/or relative density as a direct output, with or without providing relative concentrations of gas constituents, the calorific power error shall not exceed ± 0.1 MJ/m³, and the relative density error shall not exceed ± 0.5 %.

Where a device provides the relative concentrations of the gas constituents, the error shall not exceed ± 0.1 mol % for each constituent provided.

6.0 For additional information regarding this bulletin, please contact the Senior Program Officer responsible for gas measurement.

Alan E. Johnston
President