WHOLESALE MARKET ENERGY CALCULATION PROCEDURES (VICTORIA)

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1 WHOLESALE MARKET ENERGY CALCULATION PROCEDURES (VICTORIA) PREPARED BY: Operatons Meterng & Settlements DOCUMENT NO: VERSION NO: NGR 1.0 : FINAL Approved for dstrbuton and use: M. ZEMA CHIEF EXECUTIVE OFFICER ISSUE NGR 1.0 JUNE 2010

2 Verson Control Verson Date Autor(s) Canges and Comments 1 12 Sep 2000 H. Wrgt Frst Issue NGR July 2010 J Hutcson Re branded and updated to reflect NGR. DATE DOCUMENT ID-VERSION NUMBER I

3 Table of Contents 1. INTRODUCTION 3 2. SCOPE 3 3. REFERENCES 3 4. ENERGY CALCULATION METHODOLOGIES Flow-Corrector Meter Energy Calculaton Data Logger Meter PCF Energy Calculaton Basc meter Energy Calculaton 7 5. IMPERIAL METERS 8 6. PRESSURE CORRECTION FACTOR 8 DATE DOCUMENT ID-VERSION NUMBER II

4 1. Introducton Consumer meters measure gas volume flow at te prevalng pressure and temperature of te gas flowng troug te meter. Ts measured volume flow s converted to te volume te gas would occupy at standard (sometmes called reference or base) condtons. ( kpa abs and 15 C) Ts corrected volume s ten multpled by te eatng value of te gas (energy per unt standard volume) to obtan te energy content. Consumer meter nstallatons cover a wde range of flow rates and te level of sopstcaton of te calculaton of energy content s commensurate wt te value of te gas metered. 2. Scope Ts procedure relates to te calculaton of natural gas energy at consumer meterng nstallatons tat are subject to te Natonal Gas Rules (NGR). Ts procedure does not apply to meters n areas tat ave derogatons under Part D of te Gas Dstrbuton System Code or areas tat are not suppled from to te AEMO-operated gas transmsson system, unless tere s an agreement to te contrary. Ts procedure does not cover meterng nstallatons drectly off te AEMO-operated gas transmsson system as tese meters are covered by AEMO CTM (Custody Transfer Meter) procedures. 3. References NX-19 Manual for te Determnaton of Supercompressblty Factors for Natural Gas, Amercan Gas Assocaton. PAR researc project NX-19 "Extenson of range of supercompressblty tables". Date Document ID-Verson Number PAGE 3

5 4. Energy Calculaton Metodologes 4.1 Flow-Corrector Meter Energy Calculaton For meterng nstallatons wt data logger flow-correctors were te corrected volume s calculated from metered volume readngs, pressure and temperature measurements and gas composton data te followng apples: At te meterng nstallaton: Te volume of gas (n standard cubc meters) wc flows troug a meter eac our s calculated, by te flow corrector, accordng to te followng formula eac our: V Umeas Pmeas Tbase Zbase Pbase Tmeas Zmeas Note: Indvdual measurements are usually converted to an ourly average value. Energy calculaton: Te ourly energy flow (n GJ) s calculated accordng to te followng formula for eac our. = HV V 1000 Te total quantty of gas (n GJ) for te metered perod s calculated accordng to te followng formula: Were: TotalHours s eac ndvdual measurement made by te meter wtn te our; s te total quantty of gas (n GJ); s te ourly quantty of gas (n GJ); s te summaton over eac our; Date Document ID-Verson Number PAGE 4

6 V HV s te summaton over all ours of te metered perod; s te ourly corrected volume flow n standard cubc metres; s te ourly zonal eatng value of gas (n MJ per standard cubc metre) as publsed by AEMO for te approprate eatng value zone; U meas s te uncorrected flow (n cubc metres) measured by te meter; P meas P base T meas T base s te measured gas pressure (n kpa absolute) beng te gauge pressure plus kPa; s te base pressure (n kpa absolute), beng kpa; s te measured gas temperature (n Kelvn), beng Celsus temperature plus ; s te base temperature (n Kelvn), beng Kelvn; and TotalHours s te Total number of ours for te metered perod; Z meas Z base s te compressblty at measured pressure and measured temperature calculated by reference to NX-19. s te compressblty at base pressure and base temperature calculated by reference to NX-19. Were te nstallaton s suc tat a temperature probe as not been nstalled, te temperature wll be deemed to be 15 C and ts fgure wll be used n calculatons. Te gas composton data (relatve densty, ntrogen and carbon doxde concentraton) to be appled n te NX-19 algortm wll be publsed by AEMO. Date Document ID-Verson Number PAGE 5

7 4.2 Data Logger Meter PCF Energy Calculaton For meterng nstallatons ftted wt data loggers wc record only te ourly meter readngs n cubc metres and do not determne te corrected volume of gas, te followng apples: At te meterng nstallaton: Te data logger records te ourly meter readngs, U. Energy calculaton: Te calculaton of te ourly corrected volume of gas (n standard cubc meters) s accordng to te followng formula eac our: V = U PCF Te calculaton of te ourly quantty of gas (n GJ) s accordng to te followng formula for eac our: = V HV 1000 Te total quantty of gas (n GJ) for te metered perod s calculated accordng to te followng formula: Were: TotalHours s te total quantty of gas (n GJ); s te ourly quantty of gas (n GJ); V HV s te summaton over all ours of te metered perod; s te ourly corrected volume flow n standard cubc meters; s te ourly zonal eatng value of gas (n MJ per standard cubc metre) as publsed by AEMO for te approprate eatng value zone. TotalHours s te Total number of ours for te metered perod; U s te ourly flow (n cubc metres) measured by te meter for eac our of te bllng perod; and Date Document ID-Verson Number PAGE 6

8 PCF s te pressure correcton factor appled to convert te metered volume of gas to standard cubc metres. 4.3 Basc meter Energy Calculaton For meterng nstallatons not ftted wt data loggers wc are read at te start and end of eac measurement perod te followng apples: At te meterng nstallaton: Te meter ndex s read at te start and end of te meterng perod. Te dfference between te readngs (n cubc metres) ndcates te volume of gas passed by te meter. Energy Calculaton: Te total corrected volume n standard cubc meters for te metered perod s calculated accordng te followng formula: V = U PCF Te quantty of gas (n MJ) for te metered perod s calculated accordng to te followng formula: = V HV ave Were: U V PCF s te quantty of gas (n MJ) for te metered perod; s te flow (n cubc metres) measured by te meter for te metered perod; s te volume, n standard cubc metres, for te metered perod. s te pressure correcton factor appled to convert te metered volume of gas nto te same pressure and temperature as te base pressure and base temperature used for eatng value; and HV ave s te average eatng value of gas for te measurement perod (n MJ per standard cubc metre) calculated as descrbed n te AEMO Retal Market Procedures (Vctora). Were te meter s n an area tat as derogaton Date Document ID-Verson Number PAGE 7

9 under Part D of te Gas Dstrbuton System Code or s not suppled from te AEMO operated transmsson system but tere s an agreement tat ts procedure apples, an approprate eatng value wll be used. 5. Imperal Meters Were te meter at any type of nstallaton s calbrated n mperal unts te volume flow must be converted to metrc unts. 6. Pressure Correcton Factor Pressure correcton factors are only acceptable for volume converson up to meterng pressures of 450 kpa gauge. Above ts pressure te canges n gas compressblty wt canges n pressure and temperature become sgnfcant and must be taken nto account by use of flow-correctors. A table of pressure correcton factors s publsed by AEMO. AEMO wll only cange te bass on wc pressure correcton factors are calculated after consultaton wt partcpants. Te mplementaton date of any canged pressure correcton factors wll be set after consultaton wt partcpants. Pressure correcton factors for addtonal pressures wtn te pressure range of te exstng table may be calculated on te same bass as te exstng table and publsed by AEMO wtout consultaton. Date Document ID-Verson Number PAGE 8

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