ÖNORM EN 45510-4-7

This standard gives guidance on writing the technical specification for the procurement of equipment for ash handling associated with coal fired steam generating plant for use in electricity generating stations (power stations). This Guide for procurement is not applicable to equipment for use in the nuclear reactor pant area of nuclear power stations. Other possible applications of such equipment have not been considered in the preparation of this Guide. This Guide covers mechanical conveying systems which handle the ash mechanically. Among those are for example: - submerged scraper conveyor; - ram-type slag extractor; - belt conveyor; - drag-link conveyor; - vibratory conveyor; - screw conveyor; - apron conveyor; - bucket elevator; - skip hoist; - vehicles. Hydraulic conveying systems use water as conveying medium. These include for example: - water-filled ash hopper; - dry ash hopper; - sluiceway; - slurry pump with pipeline; - ejector with pipeline. Generally a combination of the above systems is employed. The equipment covered by this Guide is defined by its function rather than design type. Therefore, the guidance to the specification is stated in performance terms rather than being specified by a detailed description of the equipment to be supplied This Guide indicates to potential purchasers how their specification should be prepared so that: - the equipment type and capacity interfaces correctly with other elements of the systems such as the boiler and gas treatment plant; - predicted performance is achieved; - ancillary equipment is properly sized; - reliability, availability and safety requirements are achieved; - proper consideration is given to the evaluation process and the quality measures to be applied. This Guide does not determine the type of specification (e.g. detailed, performance, functional) or the extent of supply for any given contract which is normally decided on the b (...abbreviated)