Common use of Volume Measurement Clause in Contracts

Volume Measurement. (a) The flow Measurement Equipment shall be designed, built and installed to BS EN 1776. Further guidance is given in the Institute of Gas Engineers’ reports IGE/GM/1 and IGE/GM/4. In addition, the following standards/guidelines shall also apply: (i) For orifice plate metering systems, BS EN ISO 5167; (ii) For turbine metering systems, BS 7834 (ISO 9951); (iii) For ultrasonic metering systems, BS 7965, BS ISO/TR 12765, AGA 9;and (iv) For any other metering system, such standards/guidelines as may be agreed by National Grid. (b) The uncertainty of the Measurement Equipments must be assessed in accordance with ISO5168 and the relevant parts of ISO5167, ISO9951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties). (c) The calculation of density for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) All densities shall be determined as kilograms per cubic metre (kg/CM); (ii) The line density shall be [measured using an in-line densitometer. One densitometer shall be installed for each metering stream and these shall be installed in a ‘pressure recovery’ mode of operation to minimize the amount of gas vented to atmosphere.] [calculated from a gas composition obtained via a [gas chromatograph.] The calculation of line density will be in accordance with the latest version of the ISO 12213 using a live pressure and temperature; and (iii) The reference density shall be calculated from [reference density determined using a relative density transducer] [gas composition obtained via a [gas chromatograph.] The calculation of reference density will be in accordance with the latest version of the ISO 12213 using Standard Pressure and Standard Temperature. (d) The measurement of temperature for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) Temperatures shall be determined as degrees Celsius (°C); and (ii) The requirements of the relevant parts of ISO5167, ISO9951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties) are met. (e) The measurement of pressure for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) Pressure shall be determined as bar gauge; and (ii) The requirements of the relevant parts of ISO5167, ISO9951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties) are met.

Volume Measurement. (a) The flow Measurement Equipment shall be designed, built and installed to BS EN 1776. Further guidance is given in the Institute of Gas Engineers’ reports IGE/GM/1 and IGE/GM/4. In addition, the following standards/guidelines shall also apply: (i) For orifice plate metering systems, BS EN ISO 5167; (ii) For turbine metering systems, BS 7834 (ISO 9951); (iii) For ultrasonic metering systems, BS 7965, BS ISOAGA 9 or such standards/TR 12765, AGA 9;andguidelines as may be agreed by National Grid Gas “between the parties”; and (ivii) For any other metering system, such standards/guidelines as may be agreed by National Gridbetween the Parties. (b) The uncertainty of the Measurement Equipments must be assessed in accordance with ISO5168 and the relevant parts of ISO5167, ISO9951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties). (c) The calculation of density for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) All densities shall be determined as kilograms per cubic metre Cubic Metre (kg/CM); (ii) The line density shall be [measured using an in-line densitometer. One densitometer shall be installed for each metering stream and these shall be installed in a ‘pressure recovery’ mode of operation to minimize the amount of gas vented to atmosphere.] [calculated from a gas composition obtained via a [gas chromatograph.] . The calculation of line density will be in accordance with the latest version of the ISO 12213 AGA8 (detailed Characterisation) using a live pressure and temperature; and (iii) The reference density shall be calculated from [reference density determined using a relative density transducer] [gas composition obtained via a [gas chromatograph.] . The calculation of reference density will be in accordance with the latest version of the ISO 12213 6976 using Standard Normal Pressure and Standard Temperature.Reference Temperature B. (d) The measurement of temperature for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) Temperatures shall be determined as degrees Celsius (°C); and (ii) The requirements of the relevant parts of ISO5167, ISO9951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties) are met. (e) The measurement of pressure for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) Pressure shall be determined as bar gaugeabsolute (Pgauge + Pbaro); and (ii) The requirements of the relevant parts of ISO5167, ISO9951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties) are met.

Volume Measurement. (a) The flow Measurement Equipment shall be designed, built and installed to BS EN 1776. Further guidance is given in the Institute of Gas Engineers’ reports IGE/GM/1 and IGE/GM/4. In addition, the following standards/guidelines shall also apply: (i) For orifice plate metering systems, BS EN ISO 5167; (ii) For turbine metering systems, BS 7834 (ISO 9951); (iii) For ultrasonic metering systems, BS 7965, BS ISO/TR 12765, AGA 9;and (iv) For any other metering system, such standards/guidelines as may be agreed by National GridGas. (b) The uncertainty of the Measurement Equipments must be assessed in accordance with ISO5168 and the relevant parts of ISO5167, ISO9951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties). (c) The calculation of density for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) All densities shall be determined as kilograms per cubic metre (kg/CM); (ii) The line density shall be [measured using an in-line densitometer. One densitometer shall be installed for each metering stream and these shall be installed in a ‘pressure recovery’ mode of operation to minimize the amount of gas vented to atmosphere.] [calculated from a gas composition obtained via a [gas chromatograph.] The calculation of line density will be in accordance with the latest version of the ISO 12213 using a live pressure and temperature; and (iii) The reference density shall be calculated from [reference density determined using a relative density transducer] [gas composition obtained via a [gas chromatograph.] The calculation of reference density will be in accordance with the latest version of the ISO 12213 using Standard Pressure and Standard Temperature. (d) The measurement of temperature for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) Temperatures shall be determined as degrees Celsius (°C); and (ii) The requirements of the relevant parts of ISO5167, ISO9951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties) are met. (e) The measurement of pressure for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) Pressure shall be determined as bar gauge; and (ii) The requirements of the relevant parts of ISO5167, ISO9951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties) are met.

Volume Measurement. (a) The flow Measurement Equipment shall be designed, built and installed to BS EN 1776. Further guidance is given in the Institute of Gas Engineers’ ' reports IGE/GM/1 and IGE/GM/4. In addition, the following standards/guidelines shall also apply: (i) For orifice plate metering systems, BS EN ISO 5167; (ii) For turbine metering systems, BS 7834 (ISO 9951); (iii) For ultrasonic metering systems, BS 7965, BS ISO/TR 12765ISO 17089-1:2010, Measurement of Fluid Flow in Closed Conduits – Ultrasonic Meters for Gas. Part 1: Meters for Custody Transfer and Allocation Measurement, AGA 9;and (iv) For any other metering system, such current standards/guidelines as may be agreed by National Gridthe DN Operator. (b) The uncertainty of the Measurement Equipments Equipment must be assessed in accordance with ISO5168 IS05168 and the relevant parts of ISO5167IS05167, ISO9951 IS09951 and BS 7965 as may be applicable (or such other standards as may be agreed between the Parties). (c) The calculation of density for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) All densities shall be determined as kilograms per cubic metre (kg/CMSCM); (ii) The line density shall be [either: (A) measured using an in-line densitometer. One , in which case one densitometer shall be installed for each metering stream and these shall be installed in a ‘'pressure recovery’ ' mode of operation to minimize the amount of gas vented to atmosphere.] [; or (B) calculated from a gas composition obtained via a [gas chromatograph.] The , in which case, the calculation of line density will be in accordance with the latest version of the ISO 12213 using a live pressure and temperature; and (iii) The reference density shall be calculated from [either: (A) reference density determined using a relative density transducer] [; or (B) gas composition obtained via a [gas chromatograph.] . The calculation of reference density will be in accordance with the latest version of the ISO 12213 using Standard Pressure and Standard Temperature. (d) The measurement of temperature for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) Temperatures shall be determined as degrees Celsius (°C); and (ii) The requirements of the relevant parts of ISO5167IS05167, ISO9951 IS09951 and BS SS 7965 as may be applicable (or such other standards as may be agreed between the Parties) are met. (e) The measurement of pressure for the purpose of calculating volume flow and for correction to standard conditions shall be such that: (i) Pressure shall be determined as bar gauge; and (ii) The requirements of the relevant parts of ISO5167IS05167, ISO9951 IS09951 and BS SS 7965 as may be applicable (or such other standards as may be agreed between the Parties) are met.