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Nexus Workgroup Read V alidation Scenarios. 4 th December 2013. Background. Read Validation rules and tolerances developed during the Settlement BRD

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Nexus workgroup read v alidation scenarios

Nexus WorkgroupRead Validation Scenarios

4th December 2013


Background
Background

  • Read Validation rules and tolerances developed during the Settlement BRD

  • Concern raised at 30th October workgroup that the tolerances may not be appropriate for Class 4 sites as a ‘flat profile’ is used (AQ / 365 x no. of days in period).

  • Workgroup agreed the principle of read validation was correct but would like to examine the tolerances further

  • The following slides provide a list of various scenarios considered by Xoserve during analysis of the AQ requirements to validate the principles & tolerances described in the BRD


Scenarios
Scenarios

  • AQ = 1

    • Reason: the site has not been consuming gas for over 9 months

    • Consequence: read will fail validation

    • Outcome: AQ Correction process used to re-calculate the AQ then re-submit the read

  • AQ is significantly higher or lower than sites predicted consumption

    • Reason: change in plant or site previously ‘mothballed’

    • Consequence: read may fail validation

    • Outcome: AQ Correction process used to re-calculate the AQ then re-submit the read


Scenarios cont
Scenarios cont.

  • Site Isolated

    • AQ would carry over until 9 months consumption was available during the non-isolated period therefore read would not fail

  • Vacant site

    • AQ would reduce as reads are loaded with zero/low consumption over a period

    • If read fails due to the AQ being low, the AQ Correction process to be used to amend AQ

  • Round The Clock value incorrect/not populated

    • Read would fail due to out of tolerance

    • Re-submit read with correct ‘Round the Clock’ (TTZ) count


Scenarios cont1
Scenarios cont.

  • Change of Class – Class 4 to 2

    • SOQ is used to validate the reads, Shipper nominates the SOQ

  • Change of Class – Class 2 to 4

    • Daily reads previously loaded for site and AQ reviewed monthly. Reads should therefore pass the validations based on AQ


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