Weights and Measures Regulations (C.R.C., c. 1605)

288 Where it is necessary

• (a) to limit changes in the viscosity of, or the solubility of material dissolved in, the liquid to be measured by the meter, or

• (b) to limit the rate of change of the temperature or pressure of the liquid to be measured by the meter when the meter is equipped with an automatic compensator,

appropriate automatic controls shall be installed in the meter system to permit the meter to measure accurately.

• 289 (1) The piping on the downstream side of meters may be concealed and the outlets interconnected where the meters

  • (a) are used

    • (i) at pipeline terminals, or

    • (ii) exclusively for loading or unloading railway tank cars or loading or unloading tanker ships; and

  • (b) have adequately interlocked manual or automatic valves with means for leakage detection incorporated in the meter systems to prevent the diversion of measured liquid.

• (2) The piping on the downstream side of the meters may be concealed where the meters have more than one outlet and are used exclusively for refuelling trucks.

290 A meter shall be operated only at flow rates between the rated minimum and maximum flow rates marked on the name plate of the meter.

291 If any part of a meter system is drained for any reason the entire system shall be re-primed and re-filled and the register set to zero before the meter is used for the next measurement.

292 A flow transmitter for input to an electronic data processing system may be attached to a liquid meter and the output from the data processing system used for invoicing purposes if the purchaser of the liquid being measured or their agent or mandatary is given a printed copy of the data recorded by the data processing system before they leave the trader’s premises.

293 A flow transmitter may be installed at a key-operated self-service meter installation to drive the auxiliary accumulative totalizers for individual customers if the purchaser of the liquid being measured is able to visually check the advance of their totalizer against the indication of the primary indicator at the time of delivery of the liquid.

294 Where a meter mounted on a vehicle tank is used in circumstances where the purchaser does not normally view the meter during delivery of a liquid, the meter shall be equipped with an interlocked ticket printer that shall be used for each delivery of the liquid.

295 Tickets used with a meter equipped with an automatic temperature or other compensator shall bear statements that the volume indicated thereon has been adjusted to correspond to an equivalent volume at a standard condition stated on the ticket.

DIVISION XIIMeasuring and Vehicle Tanks

296 [Repealed, SOR/2014-111, s. 38]

Design, Composition and Construction

297 A measuring tank and its piping system and any equipment or accessories that can affect its accuracy of measurement shall be of such design, composition and construction that when a delivery is made from any capacity indication, the quantity of liquid delivered through any discharge valve rigidly connected to the measuring tank is within the prescribed limits of error for the measuring tank.

298 The shells or bulkheads of a measuring tank shall consist of such material and be so constructed that they will not become distorted under any condition of loading under normal conditions of use.

299 A measuring tank shall have an effective means of automatic venting to permit the free passage of air into and out of the measuring tank when it is emptied and filled.

300 Subject to section 320, there shall be no pipe or other flow connection between two or more measuring tanks that are separately calibrated, but a battery of calibrated measuring tanks may be connected to a common discharge manifold that prevents flow from one measuring tank to another.

301 The capacity indicators on a measuring tank shall consist of

• (a) graduations on or adjacent to a gauge glass or tube; or

• (b) appropriate internal capacity indicators.

302 A capacity indicator shall only be installed in a measuring tank at any level where a quantity of liquid equal to the limit of error referred to in section 325 for the indicated quantity causes the liquid at that level to rise by at least 2.5 mm or 3/32 of an inch.

303 A maximum capacity indicator shall be positioned to allow a volume equal to at least one per cent of the capacity of the measuring tank for the thermal expansion of the liquid.

304 When an internal capacity indicator is installed in a measuring tank,

• (a) the indicator shall be attached to a permanent section of the measuring tank; and

• (b) a means shall be provided to attach a seal on the indicator.

305 A measuring tank equipped with an internal capacity indicator shall have a suitable opening for the convenient installation, adjustment and sealing of the indicator assembly and the capacity indicator shall be located so that it can be seen under normal conditions of use.

306 Gauge glass fittings shall not, except on measuring tanks for liquefied gases, be of the ball check type or be of any type designed to prevent loss of liquid in case of glass breakage, but a bottom gauge glass fitting may include an emergency valve if means are provided thereon to allow an inspector to seal the valve in the open position.

307 The discharge hose on a measuring tank that discharges by gravity shall normally be of the dry hose type, without a shut-off valve at its discharge end, shall be of such length, size and stiffness as will ensure its complete drainage and shall be provided with a means to indicate when all of the measured liquid has been delivered thereby.

• 308 (1) A measuring tank that discharges through a pump shall have an automatic means of ensuring that

  • (a) the quantity of liquid in the pump suction and discharge lines remains constant; and

  • (b) all the measured liquid is delivered through the pump.

• (2) Subsection (1) does not apply to a measuring tank used for bunker oils and similar liquids.

309 A fixed measuring tank shall have suitably installed and identified levelling ledges that will permit the detection of any tilting of the measuring tank from the position in which it was calibrated.

• 310 (1) A portable measuring tank shall be equipped with permanent level gauges to enable it to be levelled for examination and use.

• (2) A portable measuring tank with a gauge glass shall be equipped with levelling jacks to enable it to be levelled for examination and use.

311 A vehicle tank shall be designed so as to permit the complete discharge of the contents of the tank and piping when the vehicle is on a surface that is within three degrees of level or shall be equipped with clearly defined and appropriately located means to indicate when an off-level position will prevent the tank and the piping from filling or draining properly.

312 An internal capacity indicator on a vehicle tank shall be centrally located in the tank or compartment, affixed to a mounting bracket on the dome neck by brazing, welding or bolts and shall be sealable.

313 When two or more capacity indicators on a vehicle tank are affixed to a mounting bracket, the bracket shall be held in a vertical position by a suitable brace or other reinforcement.

314 Internal capacity indicators on a vehicle tank shall be adjustable in increments of 0.8 mm or 1/32 inch or less.

315 When a vehicle tank is composed of two or more separate measuring compartments, any space between the compartments shall be equipped with drains capable of indicating leakage into the space.

316 The outlet piping from a vehicle tank may be split into a bottom-fill connection and a drain connection, but where the bottom loading stub can trap air in excess of 0.125 per cent of the capacity of the tank to the lowest marker when the tank is filled from the top, the tank shall be calibrated for top-fill.

• 317 (1) Subject to subsection (2), a common manifold connected to a vehicle tank may be split into two sections separated by means of a valve if the valve is designed so that it cannot be left in any open position.

• (2) A gate valve may be used in place of the valve referred to in subsection (1) if the volume that can be diverted by leaving the gate valve open does not exceed 0.125 per cent of the capacity of the smallest tank connected to the manifold.

318 [Revoked, SOR/93-234, s. 2]

319 The piping on a vehicle tank restricted for use with bunker oil may be concealed by insulation or by parts of the tank to prevent the bunker oil from congealing.

320 Individual compartments on a vehicle tank restricted for use with bunker oil may be connected to a common discharge manifold without any automatic means of preventing flow between the compartments.

Performance

321 A measuring tank shall be tested and calibrated with a liquid that has a thermal expansion coefficient, volatility and viscosity not greater than those of domestic furnace fuel oil and that will not have a corrosive effect on the tank.

322 A measuring tank shall be tested and calibrated when all necessary supports have been installed and it is resting in the position in which it is designed to be used.

323 A measuring tank, other than a vehicle tank, shall be calibrated to a valve immediately adjacent to the outlet connection on the tank.

324 Unless otherwise authorized by specifications established by the Minister, a measuring tank that has a gauge glass or a slip type gauge shall not be calibrated for a delivery of less than 50 per cent of the measuring tank capacity.

• 325 (1) Subject to subsection (5), when a measuring tank is tested for acceptance limits of error using a known test volume determined in relation to a relevant local standard and set out in Column I of an item of a table to subsection (3) or (4), the measuring tank is within the acceptance limits of error in respect of that known test volume if the actual volume of the measuring tank

  • (a) does not exceed the test volume by an amount in excess of the amount set out in Column II of that item; and

  • (b) is not less than the test volume by an amount in excess of the amount set out in Column II of that item.

• (2) Subject to subsection (5), when a measuring tank is tested for in-service limits of error using a known test volume determined in relation to a relevant local standard and set out in Column I of an item of a table to subsection (3) or (4), the measuring tank is within the in-service limits of error in respect of that known test volume if the actual volume of the measuring tank

  • (a) does not exceed the test volume by an amount in excess of the amount set out in Column III of that item; and

  • (b) is not less than the test volume by an amount in excess of the amount set out in Column III of that item.

• (3) Subject to subsection (5), the limits of error set out in the table to this subsection apply to all measuring tanks that are calibrated in terms of metric units of volume.

  Item	Column I	Column II	Column III
  	Known Test Volume	Acceptance Limits of Error	In-Service Limits of Error
  	Litres	Millilitres	Millilitres
  1	50	185	185
  2	100	300	300
  3	200	500	500
  4	Over 200	¼% of known test volume	¼% of known test volume

• (4) Subject to subsection (5), the limits of error set out in the table to this subsection apply to all measuring tanks that are calibrated in terms of Canadian units of volume.

  Item	Column I	Column II	Column III
  	Known Test Volume	Acceptance Limits of Error	In-Service Limits of Error
  	Gallons	Fluid Ounces	Fluid Ounces
  1	10	6	6
  2	20	10	10
  3	50	20	20
  4	Over 50	¼% of known test volume	¼% of known test volume

• (5) The limits of error for a measuring tank that is designed for use in measuring liquefied gases are twice the applicable limits of error set out in the table to subsection (3) or (4).

• (6) The limits of error set out in the tables to subsections (3) and (4) refer to the total inaccuracy of measurement by the measuring tank, including errors due to entrapment of air or liquid by parts of the measuring tank or its associated piping, equipment or accessories during filling or emptying.