PS-G-07—Provisional specifications for the verification, reverification, installation, and use of the Yewflo vortex flow meter

Date:
Bulletin: PS-G-07 (rev. 2)
Category: Gas
Supersedes: PS-G-07 (rev. 1)


PS-G-07 (rev. 2): Summary of amendments to PS-G-07 (rev. 1)
Section Description
All Reformatted to new formatting requirements.
4.2.3 Removed the requirement identified under the Government of Canada paper burden reduction initiative. Edited to support the removal of the requirement, while maintaining resolution and uncertainty requirements.
4.2.4 Removed requirement identified under the Government of Canada paper burden reduction initiative.
5.1.4 Removed. Requirements identified under the Government of Canada paper burden reduction initiative.
5.1.5 Removed. Requirement identified under the Government of Canada paper burden reduction initiative.
5.2 Edited to allow for additional requirements to be communicated in the NOA.
5.3.1 Edited to allow for additional requirements to be communicated in the NOA.
5.3.2 Edited to allow for additional requirements to be communicated in the NOA.
5.4.1 Edited to allow for additional requirements to be communicated in the NOA.
6.2.1 Revised to support the removal of the requirements identified under the Government of Canada paper burden reduction initiative.

Table of contents


1.0 Scope

These specifications apply to the Yewflo, Model YF100 Series, Style E, vortex flow meter manufactured by Johnson Yokogawa Corporation.

2.0 Authority

These specifications are issued under the authority of sections 12 and 18 of the Electricity and Gas Inspection Regulations.

3.0 Terminology

3.1 Notice of Approval – The document issued by Measurement Canada authorizing the Yewflo vortex flow meter to be considered for verification and bearing Approval reference number AG-0395.

3.2 Qmax The maximum flow rate specified for the meter in the Notice of Approval.

3.3 Qmin The minimum flow rate calculated for the meter as stipulated in clause 5.1.3.

4.0 Metrological requirements

4.1 Test medium

4.1.1 Subject to clause 4.1.2, for the performance testing purposes of clause 4.2, the meter shall be tested using a fluid medium which is representative of the gas at the meter's intended installation site.

4.1.2 Where the test medium is other than natural gas at the pressure and temperature conditions of the intended installation site, objective evidence regarding the validity of the test medium as a substitute shall be supplied by the meter owner or his agent. Use of the substitute shall be endorsed by Measurement Canada prior to the test processes.

4.2 Performance tests

4.2.1 Using a test medium complying with clause 4.1.1, the meter shall be tested at a minimum of five flow rates, approximately equally spaced from Qmin to Qmax, and the relative errors shall be recorded. See Appendix A—Test Points.

4.2.2 At least three consecutive performance tests shall be performed at each flow rate to assess meter repeatability and the arithmetic mean of these performance test errors shall be calculated to represent the error at the test point.

4.2.3 The duration of the tests performed shall be sufficient to ensure the uncertainty due to the meter resolution does not contribute more than 0.1% to the total test.

4.2.4 Where the performance of a meter is not to be linearized, the test results shall include the calculated average K-factor established for the meter. The test data shall contain all detail necessary to establish compliance with clause 4.4.

4.3 Maximum permissible errors for performance tests

4.3.1 All error determinations for a meter shall be made on the basis of meter output signals that are unprocessed after being produced by the meter.

4.3.2 The meter's relative error at each test point shall not exceed ±1.0%.

4.3.3 The deviation of any individual repeatability test error from the arithmetic mean error established for the test point shall not exceed 0.2%.

4.3.4 The deviation of the error established for a test point from the established error of any adjacent test point shall not exceed 0.6%. Compliance with this requirement shall be determined only in the relationship of the minimum test points established in clause 4.2.1.

4.4 Verification requirements

4.4.1 The meter shall be examined for conformance with the marking requirements and descriptive information contained in the Notice of Approval.

4.4.2 The meter's performance test results shall meet all requirements specified in clause 4.3.

4.5 Reverification requirements

Meters shall be submitted for reverification at least every six years. The requirements for reverification are the same as for verification.

5.0 Installation and use

5.1 General

5.1.1 The meter can be installed vertically or horizontally. In a vertically installed meter, the fluid must flow upward.

5.1.2 Where conditions of reverse flow may occur during meter usage, the installation shall incorporate features to prevent reverse flow through the meter.

5.1.3 The installation shall include provisions so that the meter is made to accumulate zero volume at flow rates of less than Qmin. The Qmin flow rate shall be determined on the basis of established operating conditions and shall result in a calculated Reynolds number that exceeds 2.00 × 104. With the consent of the selling party, the zero volume cut-off may be set to operate at a flow rate that is higher than the calculated minimum.

5.1.4 The meter shall be used in conjunction with a compatible correcting device which is programmed with suitable algorithms for converting meter output to legal measurement units.

5.1.5 The following software configuration parameters and status shall be set in the meter:

Table 1—Meter software configuration settings
Item Parameter Description Status
D01 Reynolds Number Correction Active
D05 Pipe Effect Correction Not Active
D06 Expansion Correction Factor Active

5.2 Downstream meter tube length

Unless otherwise specified by the NOA, a length of straight pipe, equal to at least five times the nominal meter diameter, shall be installed downstream of the meter and shall form the downstream meter tube. No pipe fittings, connections, elbows, tees or valves are permitted in the downstream meter tube length.

5.3 Upstream meter tube length

5.3.1 Unless otherwise stated in the Notice of Approval, where a meter is to be installed within a distance of 100 nominal meter diameters of a throttling device such as a regulator or partially closed valve, or of a compressor or other device known to produce pulsations, the manufacturer shall be consulted.

The installation shall not be permitted unless:

  1. the manufacturer or owner has conducted tests to demonstrate that the meter is not adversely affected by the device; and,
  2. the meter installation is the subject of a Notice of Conditional Approval.

5.3.2 Unless otherwise specified by the NOA, straight pipe, equal in length to at least forty times the nominal meter diameter, shall be installed upstream of the meter and shall form the upstream meter tube (40D). Where more than one pipe section is used to form the upstream meter tube length (40D), the pipe sections shall be joined using flanges which are designed or modified to include an alignment provision to ensure that the flanges and meter tubes are concentric, with no internal protrusions or misalignment. With the exception of the configurations explicitly defined in clauses 5.3.3 and 5.3.4, no other pipe fittings, connections, elbows, tees or valves are permitted in the upstream meter tube length (40D).

5.3.3 For installations where a single elbow is located in the upstream meter tube (40D), a length of straight pipe equal to at least ten times the nominal meter diameter shall be required between the elbow and the meter inlet. The meter and its vortex shedder shall be installed in the same plane as the elbow.

5.3.4 For installations where a single, concentric reducer/expander is located in the upstream meter tube (40D), a length of straight pipe equal to at least ten times the nominal meter diameter shall be required between the reducer and the meter inlet.

5.4 Meter tubes

5.4.1 Unless otherwise specified by the NOA, the inside walls of the regulated upstream and downstream meter tubes shall be smooth, not exceeding commercial roughness of 350 micro-inches. Welds and other protrusions occurring within the upstream and downstream meter tubes shall be ground to the internal diameter of the meter tubes.

5.4.2 The inside diameter of the upstream and downstream meter tubes shall be the same nominal diameters as the meter and shall be selected to be slightly larger than the inside diameters of the meter inlet and outlet. On 1 to 2 inch meters, the inside diameter of the meter tubes shall equal the published inside diameter of Schedule 40 piping, ± 0.7% of the published inside diameter.

5.4.3 No gasket shall protrude past the interior surface of the upstream and downstream meter tubes or the meter body. The inside diameter of the gasket shall be larger than the inside diameter of the meter tube so that it will not disturb the flow in the meter.

5.5 Meter alignment

5.5.1 Wafer-type Meter – The meter body shall be carefully aligned with the inside diameter of the adjacent piping using the instructions and alignment devices supplied for this purpose by the manufacturer.

5.5.2 Flange-type Meter – The alignment of the companion flanges with the meter inlet and outlet connections shall be concentric with no internal protrusions.

5.6 Pressure tap

5.6.1 The pressure tap shall be located downstream of the meter, between 5 and 7.5 nominal meter diameters inclusive from the meter outlet. The piping between the meter outlet and the pressure tap shall contain no feature which could cause a change in pressure.

5.7 Thermometer wells

5.7.1 The thermometer well shall be located downstream of the pressure tap, between 1 and 2 nominal meter diameters inclusive from the pressure tap. The piping between the meter outlet and the thermometer well shall contain no feature, other than the pressure tap, which could cause a change in temperature.

5.7.2 The thermometer well shall project one third of the inside pipe diameter into the flowing gas stream.

6.0 Administrative requirements

6.1 Markings

6.1.1 The marking requirements stipulated in the Notice of Approval shall be indelibly marked on, or be capable of being displayed by, the meter.

6.1.2 Where portions of the meter are intended to be installed remotely from each other in a multiple meter installation, the component parts shall bear sufficient additional markings necessary to inform users which components of the system will operate with each other.

6.2 Sealing

6.2.1 The meter and transmitter shall be effectively sealed to prevent unauthorized access to metrological adjustments.

7.0 Revision

The purpose of this revision is to remove requirements identified under the Government of Canada paper burden reduction initiative.

Appendix A—Test points

The units for Qmin and Qmax are acf/h at conditions representative of the gas at the intended installation site of the meter. The test points identified in the following tables meet the requirements of clause 4.2.1.

Table 2—Use where Qmin is less than 0.05Qmax
  Test Point 1 Test Point 2 Test Point 3 Test Point 4 Test Point 5
Flow rate Range Qmin to 0.05 Qmax 0.25Qmax ±0.05Qmax 0.50Qmax ±0.05Qmax 0.75Qmax ±0.05Qmax 0.95Qmax to Qmax
Table 3—Use where Qmin equals or exceeds 0.05Qmax
  Test Point 1 Test Point 2 Test Point 3 Test Point 4 Test Point 5
Nominal Flow rates Qmin (0.25Qmax + 0.75 Qmin) (0.5Qmax + 0.5Qmin) (0.75Qmax + 0.25Qmin) Qmax

Note for table 3: The actual flow rate for each test point shall be within 0.05Qmax of the nominal test flowrate.

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