WWU Statement of LDZ Transportation Charges to ... - Our Home Page
WWU Statement of LDZ Transportation Charges to ... - Our Home Page
WWU Statement of LDZ Transportation Charges to ... - Our Home Page
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3.2 <strong>LDZ</strong> System <strong>Charges</strong> Methodology3.2.1 IntroductionThe <strong>LDZ</strong> system charges effective from 1 April 2012 are based on the methodology fully described inconsultation paper DNPC08- Review <strong>of</strong> <strong>LDZ</strong> <strong>Transportation</strong> <strong>Charges</strong>. This methodology is based onan analysis <strong>of</strong> costs and system usage at a Gas Distribution Network level. The distribution networkscontain a series <strong>of</strong> pipe networks split in<strong>to</strong> four main pressure tiers:Table 3.2.1a Network Pressure TiersPressure TierLocal Transmission System (LTS)Intermediate Pressure System (IPS)Medium Pressure System (MPS)Low Pressure System (LPS)OperatingPressure7 - 38 bar2 - 7 bar75 mbar - 2 barBelow 75 mbarEach Network has a similar proportion <strong>of</strong> LTS, MPS and LPS pipelines but some Networks containless IPS pipelines. The Low Pressure System comprises the major part <strong>of</strong> the Network pipelinesystem. In order <strong>to</strong> provide a more cost reflective basis for charging, the LPS is sub-divided on thebasis <strong>of</strong> pipe diameter in<strong>to</strong> eight sub-tiers as shown below.Table 3.2.1b LPS Sub TiersPipe Diameter>600mm450- 600mm310-450mm250-310mm180-250mm125-180mm75-125mm
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