✨ Gas Information Disclosure
Disclosure under the Gas (Information Disclosure) Regulations 1997
Maui Development Limited
May 2012
4. REGULATION 18: RELIABILITY PERFORMANCE MEASURES
4.1 Estimates, Assumptions and Adjustments
Unplanned interruptions on the Maui pipeline, have been counted in four ways:
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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.
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A curtailment of a nominated shipment through the pipeline for any reason except failure of the pipeline or pipeline equipment. 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.
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A curtailment or interruption due to the failure of the pipeline or pipeline equipment. In October 2011 a breach in the pipeline required deliveries north of Pukearuhe to be suspended. Reports on the cause of this breach and the actions taken are available on the OATIS website https://www.oatis.co.nz.
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High pressure incidents considered are those that required curtailment to mitigate an over pressure situation.
Records kept using the different methods used before and after 31 October 2006 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 | Jan-Dec 2007 | Jan-Dec 2008 | Jan-Dec 2009 | Jan-Dec 2010 | Jan-Dec 2011 |
|---|---|---|---|---|---|---|
| Delivery points flow significantly less than nominated – high pressure | 107 | 95 | 10.5 | 4 | 80 | 17 |
| Loss of Supply (MPOC Sec. 15.1) | - | 11 | 20 | - | 24 | 0 |
| Initiated by a Welded Party (MPOC Sec. 15.2) | 16 | 54 | 56 | 46 | 52 | 74 |
| Pipeline outage (breach) | 0 | 0 | 0 | 0 | 0 | 138 |
| Total Curtailments (hrs) | 123 | 160 | 86.5 | 50 | 156 | 229 |
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NZ Gazette 2012, No 60
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