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Field inspection manual—volumetric measuring devices

Part 4, Section 42: Specialized test procedure—Coriolis effect mass flow meters in general

Application

This specialized test procedure (STP) is appropriate for any Coriolis mass flow meter installed to measure the mass or volume of liquids.

Coriolis mass flow meters have the ability to directly measure mass flow as well as fluid density. Coriolis meters can be configured to derive volumetric flow from the mass flow and density measurements.

Purpose

This procedure is intended to provide guidance to inspectors when conducting inspections of Coriolis mass flow measuring systems indicating in units of mass or volume.

References

Terms and Conditions for the Approval of Coriolis Liquid Meters.

Equipment

Where Coriolis meters are installed to measure in units of mass, the following equipment is required:

  • a reference scale of suitable performance;
  • local standards of mass in appropriate size and quantity; and
  • a containment vessel for the liquid product.

Where Coriolis meters are installed to measure in units of volume, a certified volumetric standard of appropriate capacity is required. Refer to the Measurement Canada (MC) bulletin V-24 for relevant local standards of volume.

Where meters are installed to measure in units of volume but are inspected by gravimetric means, the following equipment is required:

  • a certified thermometer; and
  • a certified hydrometer or pycnometer local standard.

Procedure

Pre-test considerations and verifications

  • Ensure the installation conforms to the notice of approval and the manufacturer's requirements.

    Note: Coriolis meter installations are exempt from the requirement to have a filter installed upstream of the meter.

  • Ensure that the Coriolis meter assembly is approved for the installation, type of liquid and flow rate.
  • Ensure that the firmware version is approved.
  • Ensure that the mandatory configuration parameters have been programmed as per the notice of approval. This usually includes, but is not limited to, making sure that:
    1. the low-flow cut-off value is appropriately set;
    2. the direction of flow is set for the application (forward or forward and reverse);
    3. the signal output is set to totalizing mode;
    4. the damping value is appropriately set;
    5. additional parameters that may exist within the transmitter software have been configured for the specific application; and
    6. the sensor coefficients are programmed into the transmitter.

Procedures

Testing Coriolis meters indicating in mass units by gravimetric method

When a Coriolis meter is configured to measure in units of mass, it must be tested gravimetrically. Gravimetric proving is well suited to most loading rack and vehicle-mounted Coriolis metering systems.

Normally liquid products

For fluids that are liquid at atmospheric pressure and ambient temperature, refer to the "Gravimetric Testing of Coriolis Effect Mass Flow Meters Indicating in Mass Units" STP in part 4, section 43 of MC's Field Inspection Manual—Volumetric Measuring Devices.

For applications where liquids of different densities are measured (range > 300 kg/m3), the meter must be tested with two liquids: one representative of the lower density range and one representative of the higher density range.

Liquefied gas

For liquefied gases such as anhydrous ammonia (NH3), liquefied petroleum gas, propane, butane, etc., follow the "Gravimetric Testing of Coriolis Effect Mass Flow Meters Indicating in Mass Units" STP in part 4, section 43 of MC's Field Inspection Manual—Volumetric Measuring Devices.

The only difference during inspections of the above two product groups is in the type of vessels required to collect and weigh the product. For normally liquid products, any open container, tank or tote may be used, but it must be product compatible and of sufficient capacity to contain, at least, the minimum test quantity. For liquefied gases, an appropriate pressure vessel is required.

Testing Coriolis meters indicating in volume units by volumetric method

When the Coriolis meter is configured to measure in terms of volume and is intended to measure one or multiple products, it must be tested with suitably sized volumetric standards.

Note: Refer to MC's bulletin V-24 for relevant local standards of volume.

Normally liquid products

When using narrow neck standards for normally liquid products, refer to the "Rack-Mounted Meters, Pump Supplied" inspection procedure outline (IPO) in part 2, section 2, or the "Vehicle-Mounted Meters, Pump Supplied" IPO in part 2, section 3 of MC's Field Inspection Manual—Volumetric Measuring Devices, as applicable. When using pipe prover standards, refer to MC's pipe prover training module for complete pipe prover operating instructions and procedures.

Liquefied gas

When using any of the following proving methods, refer to the "Liquefied Gas Meters (Vehicle or Rack Mounted Systems)" IPO in part 2, section 7 of MC's Field Inspection Manual—Volumetric Measuring Devices.

Vapour displacement prover

In addition to the above IPO, also refer to the "Procedure for Testing Liquefied Petroleum Gas Bulk Meters Using a Vapour Displacement Prover" STP in part 4, section 26 of MC's Field Inspection Manual—Volumetric Measuring Devices.

Pipe provers

For either conventional or small volume pipe provers, refer to MC's pipe prover training module for complete pipe prover operating instructions and procedures.

Testing Coriolis meters indicating in volume units by gravimetric method

When a Coriolis meter is configured to measure in volume units and is intended to measure one or multiple products, it must be tested with a reference scale and appropriate means to determine density. When determining density, refer to the "Procedure for Density Determination" STP in part 4, section 41 of MC's Field Inspection Manual—Volumetric Measuring Devices.

Normally liquid products

When gravimetrically testing lube oil products, refer to the "Gravimetric Testing of Meters Indicating in Units of Volume" STP in part 4, section 27 of MC's Field Inspection Manual—Volumetric Measuring Devices. For all other products, consult the appropriate MC representative for further information.

Liquefied gas products

When gravimetrically testing liquefied gas products, refer to the "Propane Metering Using Gravimetric Provers" training module for complete gravimetric prover operating instructions and procedures.

Revisions

Revision 1

Removed device types and subtypes from document title.

Date modified: