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Danalyzer Daily Automated Calibration Sequence Failures

Danalyzer Daily Automated Calibration Sequence Failures. Stuart Gibbons - Offtake Arrangements 20 August 2013. Topics. Background Issue Mitigation. Background. FWACV methodology utilised to determine daily CVs

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Danalyzer Daily Automated Calibration Sequence Failures

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  1. Danalyzer Daily Automated Calibration Sequence Failures Stuart Gibbons - Offtake Arrangements 20 August 2013

  2. Topics Background Issue Mitigation

  3. Background • FWACV methodology utilised to determine daily CVs • Calculated for individual relevant inputs to and outputs from a particular charging zone • Based on individual determinations of CV made by gas transporters using instruments and software approved by Ofgem • Letter of Approval (LOA) • Ofgem to gas transporter for CVDD and software • Letter of Direction (LOD) • Ofgem to gas transporter - Prescribes manner and location to determine CV

  4. Issue • LOA mandates daily calibration of CVDD • Since 2008 NGGD directed sites have experienced sporadic failure to initiate automatic calibration • Visibility of issue recently come to light • Issue lies with Ofgem approved software interface to CVDD controller • Approx 10% of calibrations not initiated

  5. Mitigation • (FWACV) methodology utilised since 1997 • Vast data set • Showing instrument stable and no evidence of drift • NGGD tasked GL Noble Denton to establish materiality • Summary • Study concludes no detrimental impact on determined CV • No impact on LDZ energy calculations or NTS shrinkage • Whilst issue needs resolving – no detriment to consumers

  6. Danalyzer Daily Automated Calibration Sequence Failures Thank You

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