S-G-03 – Specifications for Approval of Type of Gas Meters and Auxiliary Devices – Amendments to Measurement Canada Specification LMB-EG-08

S-G-03 – Specifications for Approval of Type of Gas Meters and Auxiliary Devices – Amendments to Measurement Canada Specification LMB-EG-08, in PDF format, 134.3 KB

Information Bulletin—Specifications for the Approval of Type of Gas Meters and Auxiliary Devices – Amendments to Measurement Canada Specification LMB-EG-08 (S-G-03)

Date: 2008-10-08
Bulletin: S-G-03
Category: Gas
Document(s): Gas Specification LMB-EG-08
Supercedes: PS-G-08

Table of Contents

1.0 Scope

This specification applies to all gas meters and auxiliary devices submitted for approval pursuant to LMB-EG-08. (Specifications for Approval of Type of Gas Meters and Auxiliary Devices).

2.0 Authority

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

3.0 References

Specifications for Approval of Type of Gas Meters and Auxiliary Devices, LMB-EG-08 (1986).

4.0 Background

Since the beginning of the application of Measurement Canada (MC) specification LMB-EG-08 and prior to the implementation of the Agency’s revised publication process in the 1990’s, the Agency has implemented changes to some of the requirements of the specifications which have not been published. The purpose of this specification is to consolidate and officially communicate the applicable requirements of LMB-EG-08 that have been changed over the years and that are currently being applied during type approval evaluation.

5.0 Amendments to Specific Sections of LMB-EG-08

5.1 Amendments to Section 1 – SCOPE of LMB-EG-08

5.1.1

Section 1 has been revised to include the scope of LMB-EG-08. The scope has been updated to identify the current documents being referenced during approvals. Section 1 is hereby amended as follows:

Authority

These specifications are established by the Director (President of Measurement Canada), under the authority of the Electricity and Gas Inspection Act and the Regulations pursuant thereto.

Section 1 – Scope

This document sets out the specifications relating to design, composition, construction and performance to which gas meters and auxiliary devices must conform in order to receive approval pursuant to section 9 of the Electricity and Gas Inspection Act. The criteria also apply to modifications which may be made in future to approved devices.

This document refers to the following and, where such reference is made, it shall be considered to refer to the latest edition and any revisions thereto:

Canadian Standards Association, Natural Gas and Propane Installation Code CAN/CSA-B149.

American Gas Association Report No. 3 “Orifice Metering of Natural Gas and Other Related Hydrocarbon Gases” (also published as American National Standards Institute Standard ANSI/API 2530, American Petroleum Institute API 14.3, and Gas Processors Association GPA 8185).

American Gas Association Transmission Measurement Committee Report No. 5 “Fuel Gas Energy Metering”.

Gas Processors Association Standard 2172, “Calculation of Gross Heating Value, Relative Density, and Compressibility of Natural Gas Mixtures from Compositional Analysis”.

American Gas Association Transmission Measurement Committee Report No. 8 “Compressibility Factors of Natural Gas and Other Related Hydrocarbon Gases” (also published as American Petroleum Institute MPMS Chapter 14.2).

Manual For the Determination of Supercompressibility Factors for Natural Gas “Par Research Project NX-19, Extension of Range of Supercompressibility Tables”.

United States Department of Defense Military Standard MIL-STD-461E “Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment”.

5.2 Amendments to Section 2 – Definitions of LMB-EG-08

5.2.1

Section 2 is hereby amended to include the following definitions:

Calorific Power

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).

Electronic Display

A device or other means used to visually present the value of a measured quantity and other relevant information. It may take the form of an integral part of a meter or a separate display module.

Electronic Register

A specific location in the meter where the value of a measured quantity is recorded.

Integral Transducer or Transmitter

A transducer or transmitter that is installed on or inside the enclosure of a host EVC device (or Flow Computer), or one that is designed to be remotely connected with signal wires for dedicated use with its host EVC device, and is presented to MC for approval together with the host EVC device. It is approved under the host EVC device’s Notice of Approval.

Non-integral Transducer or Transmitter

A transducer or transmitter that is not installed on or inside the enclosure of an EVC device (or Flow Computer), and is designed to be connected with signal wires to various different compatible makes and models of EVC devices, and is not presented together with a host EVC device for approval evaluation. It is separately approved under its own Notice of Approval.

5.3 Amendments to Section 3 – General of LMB-EG-08

5.3.1

Section 3-2 has been revised to address the current exemption for rotary meter pressure bodies from this requirement. Section 3-2 is hereby amended as follows:

3-2 Units

3-2.1 Use of Units

No meter or device shall register, or record, or be marked in a mixture of the International system of units and the Imperial system of units.

3-2.1.1 This requirement does not apply to electronic computers capable of performing calculations necessary to convert from the Imperial system of units to the International system of units, or vice versa.

3-2.1.2 This requirement does not apply to rotary meter pressure bodies designed to accept both metric and imperial modules.

3-2.2 Metric Units of Measure

3-2.2.1 Metric units of measure shall be expressed in the SI units of measure listed in the CSA standard Z234.1 Metric Practice Guide.

3-2.2.2 Where a conflict exists between the CSA standard Z234.1 and the Electricity and Gas Inspection Act and Regulations, the legislative requirements shall apply.

3-2.3 Electronic display of units of measure for non-trade purposes

3-3.3.1 The display of units of measure for non-trade purposes, such as monitoring is permitted.

5.3.2

Section 3-3.2 has been revised to remove requirements identified under the reduction initiative as being low impact requirements. Section 3-3.2 is hereby amended as follows:

3-3.2 Case

The case of a meter intended to contain gas shall be so designed and constructed to effectively maintain its accuracy over the entire ranges of its operating parameters

5.3.3

Section 3-4.1 has been revised to remove low impact requirements identified under the reduction initiative. Section 3-3.2 is hereby amended as follows:

3-4.1 Battery Power Supply

3-4.1.1 Devices which operate from a battery, or other power source which must periodically be replaced, shall be fitted with a device/function to indicate replacement is required at least 90 days prior to failure of the battery or power source.

3-4.1.2 Replacement of power source shall not adversely affect the programming, metering information, or subsequent operation of the device.

5.3.4

Section 3-5.5 has been added to address the marking requirements for software or firmware versions installed. Section 3-5 is hereby amended to add the following requirement:

3-5.5 Firmware/Software Versions

The meter firmware and/or software version shall be prominently indicated either on the meter nameplate or be accessible via an electronic display or by remote interrogation software.

5.3.5

Section 3.6.1 (a) has been revised to the ambient temperature range currently being applied. Section 3.6.1 (a) is hereby amended as follows:

  1. Ambient temperature shall be 20°C ±2° C with a rate of change not greater than 0.5°C per hour.

5.4 Amendments to Section 4 – REGISTERS of LMB-EG-08

5.4.1

Section 4-2.5 has been amended to remove low impact requirements identify under the reduction initiative. Section 4-2.5 is hereby amended as follows:

4-2.5 Registers – Pointer-Type

4-2.5.1 The minimum diameter of clock dial circles shall be 10 mm.

4-2.5.2 Each dial shall be divided into ten equal and clearly numbered divisions. Preferably, the dials shall be distinctly separated from each other.

4-2.5.3 The gearing shall be such that a complete revolution of any pointer shall cause the adjacent pointer on the left to advance one division.

4-2.5.4 Each dial shall be marked to indicate the number of measured units per revolution of the pointer.

4-2.5.5 There shall be no overall multiplier indicated on the register

4-2.5.6 The dial centers shall be located so as to avoid any possibility of ambiguity in reading.

4-2.5.7 Proving Provisions for Pointer – Type Registers

4-2.5.7.1 Proving dials and test dials provided on pointer type registers shall not be in the same geometric line as the reading circles.

4-2.5.7.2 The proving dial and the test dial circles shall have not less than ten equally spaced divisions and arrows shall show the direction of rotation of the pointers.

4-2.5.7.3 The quantity per revolution of the associated pointer shall be clearly marked.

4-2.5.7.4 No numbers shall appear on the divisions.

4-2.5.7.5 Where a register is incorporated in a meter, the measured quantity per revolution of the proving pointer shall be such that at rated capacity of the meter the proving pointer makes at least one revolution every two minutes.

5.4.2

Section 4-2.6.1 has been amended to realign the reference to the requirements for Proving Provisions for Pointer-Type Registers and update the paragraph numbering. Section 4-2.6.1 is hereby amended as follows:

4-2.6.1 Proving Provisions for Drum Type Registers

4-2.6.1.1 Drum type registers equipped with proving provisions shall have either a proving drum, a proving dial, or a proving dial and a test dial.

4-2.6.1.2 Proving dials and test dials shall conform to the requirements set out in subclause 4-2.5.7.

4-2.6.1.3 Where a proving drum is used, it shall be divided into ten equal numbered divisions.

4-2.6.1.4 The diameter of the proving drum in relation to the size of the cutout in the register face shall be such that for any rotational position of the drum there is at least one numbered division in full view.

4-2.6.1.5 There shall be a reference mark or marks designed in a manner to reduce or eliminate reading errors caused by parallax.

4-2.6.1.6 The volume per revolution of the proving drum shall be marked on the face of the register in the vicinity of the proving drum.

4-2.6.1.7 The proving drum division markings and the size and location of the reference mark shall be such that the position of the drum with respect to the reference mark can be accurately determined.

4-2.6.1.8 Where a register is incorporated in a meter, the measured quantity per revolution of the proving drum shall be such that at rated capacity of the meter the proving drum makes at least one revolution every two minutes.

5.5 Amendments to Section 5 – DIAPHRAGM METERS of LMB-EG-08

5.5.1

Section 5-3 has been revised to remove the red background requirement for temperature correcting meters and diaphragm marking requirements, identified under the reduction initiative for removal. Section 5-3 is hereby amended as follows:

5-3 Markings

5-3.1 Nameplates. In addition to the requirements of subsection 3-5, the following information shall be marked:

  1. Maximum allowable operating pressure.
  2. Manufacturer’s rated capacity on air.

5-3.1.1 Nameplates of temperature correcting meters shall show the temperature to which the registered volume is corrected (e.g. 15° C or 60° F). The information shall be permanently and prominently indicated irrespective of background colour.

5-3.2 Diaphragms

The manufacturer of the diaphragm, shall be marked on the diaphragm in such a location that the marking is visible when the diaphragm assembly is in place.

5.6 Amendments to Section 6 – Rotary Meters of LMB-EG-08

5.6.1

Section 6-3.1.1 has been amended to remove the red background requirement identified under the reduction initiative. Section 6-3.1.1 is hereby amended as follows:

6-3.1.1 Temperature Corrected Volume

Nameplates of non-modular integral temperature correcting meters and interchangeable temperature correcting modules shall show the temperature to which the registered volume is corrected (e.g. 15°C or 60°F). The information shall be permanently and prominently indicated irrespective of background colour.

5.6.2

Section 6-3.2 Gear Reduction Ratio has been revised to current practice of allowing the marking of the reduction ratio on the device which contains the gear reduction assembly. Section 6-3.2 is hereby amended as follows:

6-3.2 Gear Reduction Ratio

6-3.2.1 The overall gear reduction ratio(s) from the primary measuring element to the shaft driving the uncorrected register and the output shaft, where provided, shall be clearly and permanently marked.

6-3.2.2 Where the rotary meter pressure body contains the gear reduction assembly the marking shall be on the rotary meter pressure body.

6-3.2.3 Where the TC module contains the gear reduction assembly the marking shall be on the TC module.

5.7 Amendments to Section 7 – Turbine Meters of LMB-EG-08

5.7.1

Section 7-3.3 has been amended to remove the red background requirement identified under the reduction initiative. Section 7-3.3 is hereby amended as follows:

7-3.3 Temperature Corrected Volume

Nameplates of non-modular integral temperature correcting meters and interchangeable temperature correcting modules shall show the temperature to which the registered volume is corrected (e.g. 15°C or 60°F). The information shall be permanently and prominently indicated irrespective of background colour

5.8 Amendments to Section 8 – Orifice Meters of LMB-EG-08

5.8.1

Section 8-2 Mechanical Requirements has been amended to current requirements that are being applied by the MC approvals Lab. Section 8-2 is hereby amended as follows:

8-2 Mechanical Requirements

8-2.1 General

These specifications adopt the requirements set out in Section 2 of the fourth edition of the AGA Report No. 3, "Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids", (hereinafter referred to as the AGA Report No. 3), except as delineated below.

8-2.2 Orifice Plates

Subsection 2.4 of the AGA Report No. 3 shall apply with exception of clause 2.4.2. The recommendation for the limits of the Beta ratio shall be mandatory. The orifice shall be circular in shape.

8-2.3 Meter Tubes

Subsection 2.5 of the AGA Report No. 3 shall apply.

8-2.4 Orifice Flanges

In addition to the requirements of subsection 2.5.2 of the AGA Report No. 3, the face of each orifice flange shall be perpendicular to the axis of each tube section.

8-2.5 Gaskets

The design and material used for sealing the orifice plate in a meter shall be such as to ensure that in operation the thrust caused by total force due to the maximum differential pressure shall not displace the orifice plate to the extent that the allowable tolerances for pressure tap hole location specified in subsection 2.5.4 of the AGA Report No. 3 are exceeded under dynamic conditions.

8-2.5.1 The approval applicant shall supply written attestation that this requirement has been met, complete with supporting test data from a recognized authority.

5.8.2

Section 8-4 Performance Test has been amended to current requirements that are being applied by the MC approvals Lab. Section 8-4 is hereby amended as follows:

8-4 Performance Tests

8-4.1 General

All measurements shall be made at reference ambient temperature as specified in clause 3-6.1(a).

8-4.2 Dimensional Measurements

Measurements shall be made to establish the dimensions of the meter tubes, orifice fittings, pressure tap holes and their locations in relation to the orifice plate faces, orifice plate and surface roughness, and the thermometer well location as set out in Section 2 of the AGA Report No. 3.

The results of all measurements shall not exceed the tolerances set out in Section 2 of the AGA Report No. 3.

8-4.3 Compressibility of Orifice Plate Sealing Material

The approval applicant shall supply written attestation that this requirement has been met, complete with supporting test data from a recognized authority.

8-4.3.1 Displacement of Orifice Plate

Where the construction of the orifice plate sealing material could allow the plate to be displaced to the extent that the tolerance for a Beta ratio of 0.70, as set out in Figure 2-3 of AGA Report No. 3, would be exceeded, tests may be made to determine the actual plate displacement under maximum load as described below.

The displacement of the orifice plate caused by compressibility of the sealing material shall be such that the tolerance for a Beta ratio of 0.70, as set out in Figure 2-3 of AGA Report No. 3, is not exceeded.

8-4.3.2 Test Method using Blank Plate

The orifice plate shall be replaced in the meter run by a solid plate having the same thickness and outside diameter as the orifice plate. The sealing arrangement shall be the same as for the orifice plate. The upstream section of the orifice fitting or tube shall be sealed and the downstream section opened to the atmosphere. Pursuant to the calculations set out in subclause 8-4.3.3, pressure equivalent to the load on the orifice plate caused by 400 inches W.C. differential pressure shall be applied to the sealed section via the upstream pressure tap hole.

Where the sealing material is bonded to the orifice plate, a blank plate complete with identical sealing material bonded to it shall be supplied by the manufacturer.

The displacement of the blank plate caused by the applied load shall be measured.

8-4.3.3 Sample Calculations

The maximum load on an orifice plate corresponds to the maximum differential pressure and the smallest Beta ratio.

Assumptions
Nominal pipe size 12 inches
Pipe schedule 40
Pipe inside diameter (D) 11.938 inches
Smallest Beta ratio 0.15
Calculated orifice diameter (d’) = D × 0.15 1.7907
Nearest higher acceptable Orifice diameter (d) 1.875 inches
Differential pressure 400 inches W.C. = 14.44 psi

5.9 Amendments to Section 9 – Mass Flow Meters of LMB-EG-08

Reserved for future revisions to section 9 of LMB-EG-08.

5.10 Amendments to Section 10 – Dispensers for Natural Gas of of LMB-EG-08

Reserved for future revisions to section 10 of LMB-EG-08.

5.11 Amendments to Section 11 – Recorders of LMB-EG-08

5.11.1

Section 11 Recorders has been revoked. Advances in technology has resulted in MC not approving a new recorder in over 30 years. Therefore the reduction initiative identified this entire section as low impact requirements for removal.

5.12 Amendments to Section 12 – Chart Drives and Timing Devices of LMB-EG-08

5.12.1

Section 12 Chart Drives and Timing Devices has been revoked. This section is no longer applicable as Section 11 has been revoked.

5.13 Amendments to Section 13 – Charts of LMB-EG-08

5.13.1

Section 13 Charts has been revoked. This section is no longer applicable as Section 11 has been revoked.

5.14 Amendments to Section 14 – Mechanical Correcting Devices of LMB-EG-08

Reserved for future revisions to section 14 of LMB-EG-08.

5.15 Amendments to Section 15 – Electronic Correcting Devices of LMB-EG-08

5.15.1

Section 15-3.1 has been amended to current requirements that are being applied by the MC approvals Lab. Section 15-3.1-2 is hereby amended as follows:

15-3.1 Calculations

Calculation of accumulated units of measurement shall be according to appropriate flow equations and other provisions of the Electricity and Gas Inspection Act and Regulations.

Calculations by flow computers intended for use with orifice meters shall be according to the provisions of the latest edition of the AGA Report No. 3, "Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids".

Calculations of supercompressibility factor shall be according to the American Gas Association publication, AGA Report No. 8 – "Compressibility and Supercompressibility for Natural Gas and Other Hydrocarbon Gases", or the AGA Report No. 3 – "Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids" or the Manual For the Determination of Supercompressibility Factors for Natural Gas – Par Research Project NX-19, “Extension of Range of Supercompressibility Tables”.

5.15.2

Section 15-4 has been revised to allow for the required marking to be accessible through locations other than the nameplate and address the instances in 15-4.2 where the requirement would serve no useful purpose. Section 15-4 is hereby amended as follows:

15-4 Markings

15-4.1 Nameplate

In addition to the requirements of subsection 3-5, the following information shall appear on the nameplate or be accessible via the devices electronic display or output to an external device or through provision for printing this information:

  1. Ranges of measurement parameters for which the device is intended.
  2. Values of all non-programmable constants used in calculation.
  3. Type and range of each electrical input and/or output signal.

15-4.2 Terminal Markings

The connection terminals shall be identified by markings on the device or by a table or a schematic diagram permanently affixed to the device.

15-4.2.1 Where a metering device is designed to accept a non-interchangeable cable connector, the connection terminal for that connector is exempt from this marking requirement.

5.15.3

Section 15-5 has been renamed to “Metrological Requirements” and updated to address current requirements for integral and non-integral transducers or transmitters. Section 15-5.5 is hereby amended as follows:

15-5.0 Metrological (performance) Requirements

15-5.1 Tests at Reference Conditions

15-5.1.1 Flow Computers (devices without sensors(Delta P, P and T))

Tests shall be conducted with the device at the reference conditions set out in clause 3-6.1 of LMB-EG-08.

The following nine sets of tests shall be made on the device with external sensors. This does not preclude testing with other external devices.

The device shall be tested with (see Table 1):

  1. all inputs and programmable constants at their median(1) values.
  2. each input and programmable constant in turn at its maximum and minimum(1) value with the remaining parameters at their median values.
  3. all inputs and programmable constants at maximum values.
  4. all inputs and programmable constants at their minimum(1) values.
Table 1
Test Number 1 2 3 4 5 6 7 8 9
Flowing Gas Temperature, % of Span 50 100 (max) 0 (min) 50 50 50 50 100 (max) 0 (min)
Flowing Gas Pressure, % of Max P 50 50 50 100 (max) 25 (min) 50 50 100 25 (min)
Differential Pressure, % of Span 50 50 50 50 50 100 (max) 10 (min) 100 10 (min)

1 NOTE:

  • In some cases the minimum value of certain inputs or programmable constants may be zero. In this event, the tests above shall be carried out with the value set at 10 percent of the range of the input or programmable constant instead of the minimum value.
  • For flowing gas pressure input, the minimum will be considered to be 25% of the maximum pressure. For differential pressure input, the minimum will be considered to be 10% of the differential pressure span.
  • 50% shall correspond to the median value of the range or span of the device.

The error of devices which correct for temperature, pressure, or both shall not exceed ±0.2%.

The error of devices which correct for temperature, pressure, and supercompressibility shall not exceed ±0.3%.

15-5.1.2 Electronic Volume Conversion Devices and/or Flow Computers (devices with sensors)

The following tests apply to devices which incorporate transducers.

NOTE: For flow computers that incorporate transmitters which provide an electrical output in response to temperature or pressure, the requirements of section 16 of LMB-EG-08 shall apply.

15-5.1.2.1 Integral Conversion Devices

  1. the devices shall be attached to the host meter for testing.
  2. the devices shall be tested at 10% and at maximum flow rate of the host meter.

15-5.1.2.2 Temperature Conversion Devices

The following two sets of tests shall be made on the device with integral sensors. The device can be an integral or non-integral device to a host gas meter. This does not preclude additional testing with other included devices.

Tests shall be made with the flowing gas temperature sensing element held at the minimum temperature marked on the nameplate, 25%, 50% and 75% of the range, and at the maximum temperature marked on the nameplate (see Table 2).

Table 2
Test Number Integral or Non-integral Conversion Device
1 2
Flowrate % of Max (Integral) or % of Max Speed of Rotation or Input Frequency (Non-integral) 10 100
Flowing Gas Temperature, % of Span ( Min or Max Temperature marked on the nameplate) Min Min
25 25
50 50
75 75
Max Max

The difference between the error of the corrected registration and the uncorrected registration shall not exceed ±0.5%.

15-5.1.2.3 Pressure Conversion Devices

The following two sets of tests shall be made on the device with integral sensors. The device can be an integral or non-integral device to a host gas meter.

  1. pressure tests shall be made at 25%, 50%, 75% and 100% of the pressure range, first with increasing pressure and then with decreasing pressure (see Table 3).

The difference between the error of the corrected registration and the uncorrected registration shall not exceed ±0.5%

Table 3
Test Number Integral or Non-integral Conversion Device
1 2
Flowrate % of Max (Integral) or % of Max Speed of Rotation or Input Frequency (Non-integral) 10 100
Pressure Conversion Devices % of Pressure Range 25 25
50 50
75 75
100 100
75 75
50 50
25 25

15-1.2.4 Pressure and Temperature Conversion Devices

  1. For inputs corresponding to a linear meter the following tests shall be made:
    1. Tests 1 through 4 at a 10% of Max flowrate (Integral) or 10% of Max Speed of Rotation or Input Frequency (Non-integral)
    2. Tests 1 through 4 at a 10% of Max flowrate (Integral) or 10% of Max Speed of Rotation or Input Frequency (Non-integral)
  2. For inputs corresponding to a differential pressure the following tests shall be made:
    1. Test 1 at a differential pressure of 50%
    2. Test 2 at a differential pressure of 50%
    3. Test 3 at a differential pressure of 100%
    4. Test 3 at a differential pressure of 10%
    5. Test 4 at a differential pressure of 100%
    6. Test 4 at a differential pressure of 10%
    7. Test 5

Test No. 1

Pressure held at 50% of range and the flowing gas temperature sensing element temperatures varied as set out in item 5.1.2.2 above (see table 4).

Table 4
Test Number - One Integral or Non-integral Conversion Device
Flowing Gas Temperature, % of Span ( Min or Max Temperature marked on the nameplate) Min
25
50
75
Max
Pressure % of Range 50

Test No. 2

Flowing gas temperature sensing element held at a temperature corresponding to 50% of span and pressure varied as set out in item 5.1.2.3(a) above (see Table 5).

Table 5
Test Number - Two Integral or Non-integral Conversion Device
Pressure Conversion Devices % of Pressure Range 25
50
75
100
75
50
25
Flowing Gas Temperature % of Span 50

Test No. 3

Pressure held at 100% of range and the flowing gas temperature sensing element held at minimum and maximum temperature (see Table 6).

Table 6
Test Number Three Integral or Non-integral Conversion Device
Flowing Gas Temperature ( Min or Max Temperature marked on the nameplate) Min
Max
Pressure % of Range 100

Test No. 4

Pressure held at 25% of range and the flowing gas temperature sensing element held at minimum and maximum temperature (see table 7).

Table 7
Test Number Four Integral or Non-integral Conversion Device
Flowing Gas Temperature ( Min or Max Temperature marked on the nameplate) Min
Max
Pressure, % of Range 25

Test No. 5

The line pressure and temperature held at 50% their respective ranges and the differential pressure tests shall be made at 10%, 25%, 50%, 75%, 100% of the differential pressure range, first with increasing differential pressure and then with decreasing differential pressure.

The difference between the error of the corrected registration for any combination of temperature and pressure and the uncorrected registration shall not exceed ±0.8%.

Where, in addition, the device corrects for supercompressibility, the difference between the errors of the two registrations shall not exceed ±1.0%.

15-5.2 Tests at Other Than Reference Conditions

15-5.2.1 Flow Computers (devices without sensors)

Tests shall be conducted at ambient temperatures of −30°C and +40°C with all inputs and programmable constants at their median values (see table 8).

The difference between the error established at reference conditions and the error at other than reference conditions shall not exceed ±0.2%.

Table 8
Test Number 1 2
Ambient Temperature −30°C +40°C
Flowing Gas Temperature % of Span 50 50
Flowing Gas Pressure, % of Max 50 50
Differential Pressure, % of Span 50 50

15-5.2.2 Electronic Volume Conversion Devices and/or Flow Computers (devices with sensors)

The device, complete with the capillary of the temperature measuring system, where present, but excluding the flowing gas temperature sensing element, shall be tested at ambient temperatures of −30°C and +40°C. During testing the other provisions set out in sub-clause 5.1.2.1 shall apply.

15-5.2.2.1 Temperature Conversion Devices

Tests shall be made at −30°C with the flowing gas temperature sensing element at a temperature corresponding to 25% of the span, and at +40°C with the flowing gas temperature sensing element at a temperature corresponding to 75% of span (see table 9).

Table 9
Test Number Integral or Non-integral Conversion Device
1 2
Flowrate % of Max (Integral) or % of Max Speed of Rotation or Input Frequency (Non-integral) 10 100
Ambient Temperature −30°C −30°C
+40°C +40°C
Flowing Gas Temperature, % of Span ( Min or Max Temperature marked on the nameplate) 25 25
75 75

The difference between the error of the corrected registration and the uncorrected registration shall not exceed ±1.0%.

15-5.2.2.2 Pressure Conversion Devices

Tests shall be made as set out in item (a) in subclause 5.1.2.3 (see table 10).

Table 10
Test Number Integral or Non-integral Conversion Device
1 2
Flowrate % of Max (Integral) or % of Max Speed of Rotation or Input Frequency (Non-integral) 10 100
Ambient Temperature −30°C −30°C
+40°C +40°C
Pressure Conversion Devices % of Pressure Range 25 25
50 50
75 75
100 100
75 75
50 50
25 25

The difference between the error of the corrected registration and the uncorrected registration shall not exceed ±1.0%.

15-5.2.2.3 Temperature and Pressure Conversion Devices

  1. tests shall be made at −30°C with the combination of parameters set out in Table 11.
Table 11
Test Number 1 2 3
Flowing Gas Temperature, % of Span 25 25 25
Pressure (P or ΔP) % of Max 25 50 75
Ambient Temperature −30°C −30°C −30°C
  1. at +40°C, tests shall be made with the combination of parameters set out in Table 12.
Table 12
Test No. 1 2 3
Flowing Gas Temperature, % of Span 75 75 75
Pressure (P or ΔP) % of Max 25 50 75
Ambient Temperature +40°C +40°C +40°C

The difference between the error of the corrected registration for any combination of temperature and pressure and the uncorrected registration shall not exceed ±1.3%.

Where, in addition, the device corrects for supercompressibility, the difference between the errors of the two registrations shall not exceed ±1.5%.

5.16 Amendments to Section 16 – Temperature and Pressure Transducers of LMB-EG-08

5.16.1

Section 16-1 has been revised to clarify that this section does not apply to temperature and pressure transducers that are integral to an EVC. Section 16-1 is hereby amended as follows:

16-1 Scope

16-1.1 This section of these specifications applies to stand alone devices which provide an electrical output in response to temperature or pressure.

16-1.2 Devices which provide an electrical output in response to temperature or pressure, that are an integral component of a host device are dealt with in the applicable section of these specifications for the host device.

5.17 Amendments to Section 17 – Densitometers of LMB-EG-08

Reserved for future revisions to section 17 of LMB-EG-08.

5.18 Amendments to Section 18 – Relative Denisty Devices of LMB-EG-08

Reserved for future revisions to section 18 of LMB-EG-08.

5.19 Amendments to Section 19 – Calorimeters of LMB-EG-08

5.19.1

Section 19-1 has been revised to update the term “calorific power” to read “energy density”, to reflect current terminology used in the regulations. Section 19-1 is hereby amended as follows:

19-1 Scope

This section of these specifications applies to devices which measure the energy density of gas by the process of combustion of the gas.

5.19.2

Section 19-2 has been revised to update the term “calorific power” to read “energy density”, to reflect current terminology used in the regulations. Section 19-2.1 is hereby amended as follows:

19-2 Mechanical Requirements

In addition to the requirements of subsection 3-3, the following shall apply.

19-2.1 Charts

Where a device incorporates a recorder showing energy density over time, charts supplied with the recorder shall be of an approved type or shall be subject to the requirements of these specifications.

19-2.2 Chart Drive

A chart drive supplied with a recorder showing energy density over time shall be of an approved type or shall be subject to the requirements of these specifications.

5.19.3

Section 19-3 has been revised to update the term “calorific power” to read “energy density”, to reflect current terminology used in the regulations. Section 19-3 is hereby amended as follows:

19-3 Markings

19-3.1 Nameplate

In addition to the requirements set out in subsection 3-5, the following information shall be marked.

  1. Range of energy density . Where applicable, the units of energy density shall include the pertinent base conditions.
  2. Type and range of auxiliary output signal* (if provided).

NOTE: 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 calorimeter.

19-3.2 Operating Information

Where the operating parameters can be adjusted by the contractor, a nameplate, tag, sticker, or other suitable means shall be provided by the manufacturer for marking the required information.

5.19.4

Section 19-4 has been revised to update the term “calorific power” to read “energy density”, to reflect current terminology used in the regulations. Section 19-4 is hereby amended as follows:

19-4 Performance Tests

19-4.1 Tests at Reference Conditions

Tests shall be conducted with the device at the mid-point of the ambient operating temperature range stated on the nameplate. A sufficient number of test gas samples shall be used to test the device over the range of energy density.

19-4.2 Tests at Other Than Reference Conditions

The device shall be tested at the extremities of the ambient operating temperature range stated on the nameplate with a test gas having energy density equivalent to the mid-point of the operating range.

19-4.3 Accuracy

For tests at reference conditions and other than reference conditions, the device shall measure energy density with an error not greater than ±0.1 MJ/m3 (at standard conditions) or ±2.7 Btu(60.5)/ft3 (at standard conditions).

5.20 Amendments to Section 20 – Gas Chromatographs of LMB-EG-08

5.20.1

Section 20-1 has been revised to update the term “calorific power” to read “energy density”, to reflect current terminology used in the regulations. Section 20-1 is hereby amended as follows:

20-1 Scope

This section of these specifications applies to any device or system which measures the energy density, relative density or the molecular composition of a gas sample by identifying the component concentrations of the gas.

5.20.1

Section 20-3.1 was been amended under PS-G-08. The requirements identified PS-G-08 have been moved to this document to ensure requirements are restricted to a limited number of locations. This will avoid confusion of requirements and ensure consistent application of the requirements.

Section 20-3.1 is hereby amended as follows:

20-3.1 Nameplate

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

  1. type and range of auxiliary output signal* (if provided).

NOTE: 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.

  1. The recognized standard used by the device in calculating the energy value from the gas composition.
  2. 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 energy density.

5.20.2

Section 20-4.1 was been amended under PS-G-08. The requirements identified PS-G-08 have been moved to this document to ensure requirements are restricted to a limited number of locations. This will avoid confusion of requirements and ensure consistent application of the requirements.

Section 20-4.1 is hereby amended as follows:

20-4.1 Tests at Reference Conditions

20.-4.1.1 The chromatograph shall be set up and calibrated according to the manufacturer’s instructions.

20-4.1.2 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.

Component MOL %
Oxygen 0.01 to 1
Helium 0.01 to 1
Carbon Dioxide 0.01 to 15
Nitrogen 0.01 to 15
Methane 50 to 100
Ethane 0.01 to 20
Propane 0.01 to 10
IsoButane 0.01 to 5
N-Butane 0.01 to 5
Iso-Pentane 0.01 to 2
N-Pentane 0.01 to 2
Hexanes Plus 0.01 to 2

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 %.

20-4.1.3 If different ranges are specified by the manufacturer, the device shall be tested using samples of known concentration within the specified ranges.

20-4.1.4 The true energy density 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 for Physical Constants for Hydrocarbons and Other Compounds of Interest to the Natural Industry, GPA 2145.

20-4.1.5 Where a device provides energy density 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 %.

20-4.1.6 Where a device provides the relative concentrations of the gas constituents, the error shall not exceed ±0.1 mol % for each constituent provided.

5.21 Amendments to Section 21 – Electrical Pulse Devices of LMB-EG-08

5.21.1

Section 21-1 has been revised to remove the exclusion of these components in flow computers. These requirements are currently being applied to pulse components available for flow computers. Section 21-1 is hereby amended as follows:

21-1 Scope

21-1.1 This section of these specifications applies to pulse generators and associated pulse transmitting and receiving devices.

5.21.2

Section 21-2 has been revised to allow for the current practice of exempting Automatic meter reading (AMR) devices from marking requirements for firmware versions, provided that certain conditions are met. Section 21-2.5 is hereby added as follows:

21-2.5 Automatic Meter Reading (AMR) Devices

21-2.5.1 AMR devices shall have the applicable marking of this section marked on the nameplate or displayed where a display of the marking is permitted.

21-2.5.2 AMRs are exempt from the requirement to mark or display the firmware version, where the following conditions have been met:

  1. the firmware is not being used to perform a metrological function;
  2. the readings are not used in the calculation of a legal unit of measurement;
  3. other means has been provided for identifying the firmware version

5.22 Amendments to Section 22 – Pressure Regulators of LMB-EG-08

Reserved for future revisions to section 22 of LMB-EG-08.

6.0 Additional Information

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

Alan E. Johnston
President
Measurement Canada