Week
A week is defined from Monday at 06:00 a.m. to next Monday at 06:00 a.m.

Weekly nomination
has the meaning ascribed to the operating manual storage Section III, paragraph 2.

Withdrawal curve
The withdrawal curve represents the perfor­mance of a storage in the form of a function “hourly withdrawal rate vs. percentage of withdrawn working gas volume”. With a full storage this function generally has a constant path up to a break point from which the withdrawal rate conti­nuously decreases with the withdrawn working gas.

Withdrawal period
With regard to the pore storages Dötlingen and Uelsen the withdrawal period starts after the autumn shutdown phase and ends after the spring shutdown phase for each storage. The withdrawal period generally commences on October 1 of any one year and ends on April 1 of the following year.

Withdrawal rate
Volume of the natural gas flow at the storage offtake point when the natural gas is withdrawn from the storage in accor­dance with the respective withdrawal curve. Withdrawal rate is stated in m³(Vn)/h unless otherwise speci­fi­cally noted.

Wobbe number
The Wobbe number is a specific value for the inter­chan­ge­ability of natural gases with regard to thermal load on natural gas appliances. It usually relates to normal condition. Combus­tible natural gases of various compo­si­tions display an almost identical thermal load with the same Wobbe number and the same pressure (flowing pressure) at the burner.

Working gas volume
Storage volume into which a storage customer can inject natural gas or from which he can withdraw natural gas. Working gas volume is stated in m³ (Vn) unless otherwise speci­fi­cally noted.