BS EN 45510-6-2:1998
Guide for the procurement of power station equipment - Turbine auxiliaries - Feedwater heaters

Standard No.

BS EN 45510-6-2:1998

Release Date

1998

Published By

British Standards Institution (BSI)

Latest

BS EN 45510-6-2:1998

Replace

94/713073 DC-1994

Scope

This standard gives guidance on writing the technical specification for the procurement of feedwater heaters for use in electricity generating stations (power stations). This Guide for procurement is not applicable to equipment for use in the nuclear reactor plant area of nuclear power stations. Other possible applications of such equipment have not been considered in the preparation of this Guide. This Guide covers surface feedwater heaters installed in power plants and used to heat the main condensate and feedwater to be supplied to the steam producing system. Shell and tube type feedwater heaters are included in this Guide, while direct contact feedwater heaters are covered by a separate guide (see EN 455106-1 "Guide for procurement of power station equipment —Part 6-1: Turbine auxiliaries —Deaerators"). Feedwater heaters may or may not have a separate or internal drain cooler or desuperheater. The feedwater heaters heating the main condensate are low pressure (LP) and those heating the feedwater are high pressure (HP) feedwater heaters. Depending on their installation and design they may belong to the following types: - horizontal type; - horizontal in the condenser exhaust neck; - vertical water box up; - vertical water box down; - feedwater heaters with condensing zone only; - two zone feedwater heaters (condensing and drain cooling or condensing and desuperheating zone); - three zone feedwater heaters (desuperheating, condensing and drain cooling zones); - duplex LP heaters; - header type feedwater heaters; - tube sheet type feedwater heaters; - separate drain coolers; - separate desuperheaters. This Guide does not cover feedwater heating systems using waste heat taken from the exhaust of gas turbines or from the exhaust of a boiler or gland steam; generally, it only applies to systems which use extraction steam. 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 other heaters, deaerator, condenser, steam generator, etc.; - 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 basis of the purchaser's project strategy. It does not cover: - any commercial, contractual or legal issues which are normally in separate parts of an enquiry; - any allocation of responsibilities which are determined by the contract. This Guide does not prescribe the arrangement of the documents in the enquiry. NOTE As a comprehensive European environmental policy is still under preparation, this Guide does not address the environmental implications of the equipment.

BS EN 45510-6-2:1998 history

• 1998 BS EN 45510-6-2:1998 Guide for the procurement of power station equipment - Turbine auxiliaries - Feedwater heaters