دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: reduction in service or purchases below contracted-for levels. Curtailment of gas sales service is a method of balancing a utilitys natural gas requirements with its natural gas supply. There is usually a hierarchy of customers for the curtailment plan based on priority of usage according to established regulatory standards of priority. A customer may be required to cut back partially or totally to eliminate this take of gas, depending on the severity of the shortfall between gas sup- ply and demand and the customers position in the hierarchy. From the customers standpoint. curtailment may also mean a reduction by the customer of its takes of gas from its supplier. Curtailment of a transportation service occurs when demands for service exceed the capacity of the pipeline. Capacity curtailment is based on contract rather than end-use priority. All interruptible service must be entirely curtailed before any firm service is curtailed. Currently, interruptible transportation service is curtailed based on position in the firstcome, first-served queue. Firm transportation service is usually curtailed on a pro rata basis.