Category: Gas
Issue date:
Effective date:
Revision number: 3
Supersedes: S-G-03 (rev. 2)
Part 16: Gas chromatographs
Table of contents
- 1.0 Scope
- 2.0 Unit requirements
- 3.0 Metrological requirements
- 4.0 Technical requirements
- 5.0 Marking requirements
- 6.0 Sealing requirements
- 7.0 Administrative requirements
- 8.0 Performance test requirements
1.0 Scope
This part of the Specifications applies to online and laboratory gas chromatographs used to perform a compositional analysis of a gas sample to calculate the calorific value and relative density.
2.0 Unit requirements
Note: The requirements of Part 1, section 1.0 apply.
3.0 Metrological requirements
Note: The following requirements of Part 1, section 2.0 apply:
- 2.1 Rated operating conditions
- 2.3 Maximum permissible errors
3.1 Maximum permissible errors
3.1.1 Calorific value
The error must not exceed a maximum permissible error (MPE) of ± 0.5%.
3.1.2 Relative density
The error must not exceed a MPE of ± 0.7%.
3.1.3 Nitrogen and carbon dioxide concentrations
Where a gas chromatograph is intended to measure concentrations of only nitrogen and carbon dioxide, the error must not exceed a MPE of ± 0.1 mole %.
3.2 Repeatability
The repeatability error must not exceed the applicable limits specified in Table 1 below. The applicable repeatability limit is based on the mole percent (mol %) of the individual gas component, as documented on the particular gas mixture's certificate of calibration.
Gas component (mol %) | Repeatability limit (mol %) |
---|---|
0 to 1 | 0.03 |
Over 1 to 5 | 0.05 |
Over 5 to 25 | 0.15 |
Over 25 | 0.30 |
4.0 Technical requirements
Note: The following requirements of Part 1, section 3.0 apply:
- 3.1 Design, composition and construction
- 3.4 Case
- 3.7 Indication
- 3.8 Output
- 3.9 Power sources
- 3.10 Software
- 3.12 Registration
4.1 Calculations
Unless otherwise specified by MC, the calorific value and relative density of the sample gas must be calculated using the relative concentrations of all components of the sample gas as established in accordance with GPA 2172 and GPA 2145 or ISO 6976.
5.0 Marking requirements
Note: The following requirements of Part 1, section 4.0 apply:
- 4.1 Permanency and legibility
- 4.2
- (a) Departmental approval number
- (b) Manufacturer's name or registered trademark
- (c) Model or type designation
- (d) Serial number
- (e) Ambient temperature range, where less than -30 °C to 40 °C
- (f) Pmin (where applicable) and Pmax
- (l) Protocol/interface for digital input and/or output
- 4.9 External power supply
- 4.10 Software
- 4.12 Inspection number
- 4.13 Verification marks
- 4.14 Operating information
According to the characteristics of the device, the subsection 4.3 of Part 1 may also apply.
5.1 Recognized standard
The recognized standard used for the calculation of the calorific value and density must be marked on the nameplate, or be capable of being displayed by the gas chromatograph.
6.0 Sealing requirements
Note: The following requirements of Part 1, section 5.0 apply:
- 5.1 General
- 5.2 Electronic gas metering devices
7.0 Administrative requirements
Note: The requirements of Part 1, section 6.0 apply.
8.0 Performance test requirements
Note: Test conditions and performance tests can be obtained by contacting MC.