Maui Pipeline Performance Measures




REGULATION 18: RELIABILITY PERFORMANCE MEASURES

4.1 Estimates, Assumptions and Adjustments

For the Maui pipeline, unplanned interruptions have been counted in three ways:

  1. An interruption in the supply of Maui gas into the pipeline, whether or not there was any effect on users. Figures are available up to the end of October 2006. This measure became inadequate as substantial amounts of gas from non-Maui sources became available.

  2. A curtailment of a nominated shipment through the pipeline for any reason. This measure has been used since November 2006. The possible reasons for curtailment include matters outside the pipeline operator’s control such as failure of a party to supply gas as scheduled, or failure of a party to take gas from the pipeline as scheduled, or force majeure events affecting pipeline delivery or off take. A curtailment may only affect some pipeline customers, with others unaffected.

  3. A curtailment or interruption due to the failure of the pipeline or pipeline equipment. There have been no failures of this type in the periods reported on.

Records kept using the different methods are not directly comparable.

4.2 Unplanned Interruptions

Oct-Dec 2005 Jan-Oct 2006
Unplanned Maui outages affecting the pipeline (hrs) 1.0 16.5
Curtailments by cause (hours) Nov-Dec 2006
Delivery points flow significantly less than nominated – high pressure 107
Initiated by a Delivery Welded Party (MPOC Sec 15.2) 16
Total Curtailments (hrs) 123


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Online Sources for this page:

VUW Te Waharoa PDF NZ Gazette 2007, No 68


Gazette.govt.nz PDF NZ Gazette 2007, No 68





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🌾 Financial and Efficiency Performance of Maui Pipeline (continued from previous page)

🌾 Primary Industries & Resources
Maui Pipeline, Financial Performance, Efficiency Measures, Notional Accounts, Tariff Income, Expenses, Assets, Depreciation, Tax, Governance Costs, Balancing Gas Services, Accounting Return, Rate of Profit, Direct Line Costs, Indirect Line Costs, Reliability Performance Measures, Unplanned Interruptions, Curtailments, Pipeline Failures