... the provision of an hourly schedule of gas volumes (hourly profiles) taken through each of the NTS Offtakes into the LDZ in the form of Offtake Profile Notifications (OPNs). Although these profiles can be altered throughout the day to reflect changes in the demand, there are strict rules as to how much...

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... (temperature dependant) demands at all considered offtakes in a network. The demand of each offtake is calculated. This is done for every hour (1-24), for both a working day and a weekend day and for several temperatures. These temperatures are taken from a given temperature probability distribution. By adding...

... the iterative nature some words will be spend on sequential linear programming and then some final words in the conclusion. 3 Traditional approach Given a network with all types of elements. From the pipelines, the relations are already known. An offtake is quite simple, the flow of this branch equals some...

... geographic areas, known as Local Distribution Zones (LDZs), via approximately 120 offtakes. The average daily sendout is about 7500 mmscf (220 mcm) and peak sendout is about twice that. The NTS consists of: gas reception terminals; a high-pressure pipeline system; compressor stations; in-line regulator...