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PS-G-09 Provisional Specification for the Certification of Gas Measuring Apparatus - Bell Provers (an amendment to section 4.6 of LMB-EG-13: 1989)

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1. Scope

This specification amends the bell prover dimensional calibration requirements presently delineated in Measurement Canada specification LMB-EG-13 (1989). The LMB-EG-13 (1989) document outlines the current requirements applicable to the calibration, certification, and use of bell prover measuring apparatus and is intended for the certification or re-certification of volumetric bell provers and associated readout devices used for the verification and/or reverification of diaphragm meters.

2. Authority

This document is issued pursuant to section 5 of the Electricity and Gas Inspection Act and Part I of the Regulations established thereto.

3. Definitions

Certification: A process which ensures that a measuring apparatus has been properly calibrated, properly installed for its intended use, and that an acceptable accuracy correlation exists between it and a reference standard.

Certification testing: A specialized form of calibration performed according to fixed standards which must be met prior to the issuance of the Measurement Canada proving system certificate.

Local volumetric standard: A master bell prover located at or near the site of the gas measuring apparatus.

Master bell prover: The volumetric standard which is traceable to a national reference standard.

Volume correlation: The process by which a specific volume registered by a transfer meter or measured by a gas measuring apparatus is related to or traceable to a local volumetric standard.

4. Amendments

LMB-EG-13: 1989 is amended as follows:

4.1 Section 4.6 is replaced by the following:

4.6 Bell Prover Certificate

The most recent certificate for the dimensional calibrations of the bell prover to be certified shall be provided.

4.6.1 Requirements

Where the certification testing is in relation to the certification of a Master Bell prover, the dimensional calibrations of the bell prover shall have been completed by representatives of Measurement Canada's Calibration Services Laboratory and shall be available to Measurement Canada at the time of certification testing. For the results to be considered as acceptable the date of the dimensional calibration results shall be current to within a 5 year period from the date of certification testing.

Where the certification testing is in relation to the certification of a bell prover measuring apparatus which is not a Master Bell, a certificate of dimensional calibrations is not required to be provided, if

1. transfer meters and transfer groups representative of meters in the various meter classifications are used to determine the percent error of the measuring apparatus by volume correlation to a local volumetric standard; and
2. a dimensional calibration certificate for the referenced local volumetric standard is provided as noted above.

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

Alan E. Johnston
President