1、- STD-ES1 BS EN 45510-b-b-ENGL 2000 W Lb24669 0824525 b73 M BRITISH STANDARD Guide for procurement of power station equipment - Part 6-6: Tiirbine auxiliaries - Wet and wet/dry cooling towers The European Standard EN 455104-6 1999 has the status of a British Standard NO COPYING WITHOITT RSI PERMISSI
2、ON EXCEPT AS PERMITTED RY COPYRIGHT LAW BS EN C5510-6-6:2000 STD-BSI BS EN 45510-6-b-ENGL 2000 D 1624b69 082452b 50T E BS EN 46610-6-6:2000 Amd. No. ISBN O 580 35366 6 Date Comments National foreword This British Standard is the English language version of EN 4551066: 1999. The UK participation in i
3、ts preparation was entrusted to Technical Committee El-120, Power engineering steering commitLee, which has the responsibility to: - aid enquirers to understand the te* - present to the responsible European committee any enquiries on the - monitor related international and European developments and
4、promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK. A list of organizations represented on this committee can be obtained on request to its secretay. Cross-references The British Standards which implement international or European publications refe
5、rred to in this document may be found in the BSI Standards Catalogue under the section entitied “International Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ail the necessary provisions of a
6、contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 24, an inside
7、 back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication STDmBSI BS EN 45530-b-b-ENGl 2000 I Lb24bb9 0824527 Ililb EUROPEAN STANDARD EN 4551044 NORME EUROPEENNE EUROPISCHE NORM October 1999 ICs
8、English version Guide for procurement of power station equipment - Part 6-6: Turbine auxiliaries - Wet and wet/dry cooling towers Guide pour lacquisition dbquipements destins aux centrales de production dlectricit - Pattie 6-6: Auxiliaires de turbine - Arorfrigrants humides et humidesIsecc Leitfaden
9、 fr die Beschaffung von Ausrstungen fr Kraftwerke - Teil 6-6: Turbinenhilfseinrichtungen - Na - spray assembly; - filling (film packing, splash grids or laths, etc.); - heat exchangers; - drift eliminator; - winter operating equipment; - fan and fan ancillaries; - noise attenuation equipment; - pipe
10、work and valves. - condenser; - cooling water pumps and associated auxiliaries; - chemical and mechanical raw water treatment; - civil work. This Guide does not cover: The equipment covered by this Guide is defined by its function rather than design type. Therefore, the guidance to the specification
11、 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 sy
12、stems such as - predicted performance is achieved; - ancillav 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. condenser, cooling water supply and civil wor
13、k; 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 purchasers project strategy. It does not cover: - any commercial, contractual or legal issues which are nor
14、mally 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 addr
15、ess the environmental implications of the equipment. OBSI 01-2000 STD-BSI BS EN 45510-6-b-ENGL 2000 lb24669 0824533 747 Page 7 EN 45510-6-6:1999 2 Normative references This Guide for procurement incorporates by dated or undated reference, provisions from other publications. These normative reference
16、s are cited in the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this Guide only when incorporated in it by amendment or revision. For undated references, the latest edition
17、of the publication referred to applies. EN /SO 9001 EN IS0 9002 1/32 60050- 19 1 Quality systems - Model for quality assurance in design, development, production, installation and servicing (IS0 9001 :1994). Quality systems - Model for quality assurance in production, installation and servicing (IS0
18、 9002:1994). International electrotechnical vocabulary - Chapter 19 1: Dependability and quality of service. 3 Definitions For the purposes of this Guide, the following definitions apply: 3.1 Organizational terms 3.1.1 purchaser: Recipient of a product andor a service provided by a supplier. 3.1.2 s
19、upplier: Person or organization that provides a product and/or a service to the purchaser. 3.1.3 specification: Document stating technical requirements of the purchaser. It may form part of an enquiry issued by a purchaser. 3.1.4 enquiry: Invitation to tender issued by a purchaser. It will normally
20、include a specification together with the necessary contractual and commercial conditions. 3.1.5 tender: Offer made by a tenderer in response to an enquiry. 3.1.6 tenderer: Person or organization submitting a tender for the equipment in response to the enquiry. 3.1.7 site: Place to which the equipme
21、nt is to be delivered or where work is to be done by the supplier, together with so much of the area surrounding as the supplier may, with the consent of the purchaser, use for the purposes of the contract. NOTE: Further definitions of useful organizational terms may be found in EN IS0 8402 (see Bib
22、liography). 3.2 Technical terms 3.2.1 by direct contact. 3.2.2 cooling bundles. 3.2.3 air outside the cooling tower and the hot air inside. 3.2.4 3.2.5 filling. 3.2.6 air outlet. 3.2.7 directions. wet cooling tower: Cooling tower in which the heat exchange between water and air is achieved wetfdry (
23、hybrid) cooling tower: Cooling tower with a combination of wet cooling fill and dry natural draught: Where the air circulation is generated by a density difference between the cold mechanical draught: Where the air circulation is generated by fans. forced draught: Mechanical draught in which the fan
24、s are located between the air inlet and the induced draught: Mechanical draught in which the fans are located between the filling and the counterflow cooling tower: Where, in the filling, the air and the water flows are in opposite OBSI 01-2000 STD-BSI BS EN 45510-b-b-ENGL 2000 1b24bb7 0821i534 b8b
25、I Page 8 EN 45510-6-611999 3.2.8 crossflow cooling tower: Where, in the filling, the air flows perpendicular to the water. 3.2.9 spray nozzle (spray assembly): Device in the distribution system which breaks up the cooling water into droplets, and effects uniform spreading over the wetted area of the
26、 tower. In an open distribution system a spray nozzle will comprise a down spout and a splash plate. 3.2.10 down spout: Short pipe or nozzle used in an open distribution system to discharge water on to a splash plate. 3.2.11 splash plate: Used in an open distribution system to receive water from a d
27、own spout and to spread water over the wetted area of the tower. 3.2.12 filling: Material placed within the wet cooling tower to increase heat and mass transfer between the cooling water and the air flowing through the tower. 3.2.13 film packing: All of the surfaces over which the water flows as a c
28、ontinuous film. 3.2.14 splash gridlsplash lath: Gridloblong plate to promote the splashing of droplets and to slow down their fall in a splash filling. 3.2.15 heat exchanger: Assembly of tubes in the dry part of a wetldry cooling tower. 3.2.16 drift loss: Water loss from the tower in droplet form. 3
29、.2.17 drift eliminator: System of baffles located in the air flow downstream of the filling designed to reduce the quantity of entrained water leaving the tower. 3.2.18 cooling water: Warm water which enters the cooling tower to be re-cooled. 3.2.19 make-up water: Water added to the cooling water sy
30、stem to compensate for water losses from the system by evaporation, drift, blow down and leakage. 3.2.20 blow down: Water discharged from the system to control concentration of salts or other impurities in the cooling water. 3.2.21 concentration ratio: Ratio of the impurities in the cooling water an
31、d the impurities in the make- up water. 3.2.22 cooling range: Difference between the hot water temperature and the recooled water temperature. 3.2.23 heat load (thermal load): Heat rejected from the cooling water within the tower. 3.2.24 dry bulb temperature: Air temperature indicated by a thermomet
32、er with a dry bulb protected from any radiation effect. 3.2.25 wet bulb temperature: Temperature indicated by an adequately ventilated and wetted thermometer protected from any radiation effect. 3.2.26 approach: Difference between the recooled water temperature and the inlet air wet bulb temperature
33、. 3.2.27 isolated central water distribution: Central water distribution zone which is isolated in cold weather in order to reduce the heat exchange. 3.2.28 deicing pipe: Pipe ringmain situated above the air inlet, used in cold weather to redirect the water from the isolated central water distributi
34、on to the periphery of the cooling tower. 3.2.29 louvres: Devices installed in a tower wall, to control the air flowrate into the tower and to prevent water droplets escaping due to wind effects. 3.2.30 cooling tower riser: Vertical duct connecting the warm water inlet ducts to the main water distri
35、bution system. 3.2.31 cell: Smallest subdivision of a cooling tower bounded by exterior walls and partition walls which can function as an independent unit as regards air and water flow. OBSI 01-2000 Page 9 EN 45510-6-61999 3.3 General terms 3.3.1 equipment: Plant, component, system andor associated
36、 service to be provided in response to the enquiry. 3.3.2 conformity: Fulfilment of specified requirements by a product, process or service. 3.3.3 performance: Obligations verified by specified tests. 3.3.4 operating period: Time between planned outages or maintenance periods during which the equipm
37、ent is in operation and/or does not restrict operational requirements of the power station. 3.3.5 life expectancy: Time period over which the equipment might be expected to operate with planned maintenance but without replacement of a significant component For example, a wet cooling tower riser is a
38、 significant component. 3.3.6 design life: Operating hours of the equipment on which design calculations are based. 3.3.7 acceptability: Compliance with criteria defined by the purchaser for assessing the suitability of equipment. 3.3.8 equipment margins: Allowance for design, fabrication or operati
39、ng contingency defined in the specification. These are separate to those normally included by the supplier for his own purposes. 3.3.9 proven equipment: Equipment which may be demonstrated to be similar to that offered and has operated for a sufficient time to have demonstrated performance and avail
40、ability. 3.3.70 availability: As defined in IEC 60050-1 9 1. 3.3. i i reliability: As defined in IEC 60050- 19 1. 3.3. i 2 maintainability: As defined in IEC 60050- 19 1. 4 Brief overall project description 4. i Role and organization of purchaser The enquiry should define the purchasers role in the
41、project, including whether the purchaser will assume responsibility for the planning and technical coordination of the project, or whether other organizations will be appointed to carry out all or part of this function. lhe enquiry should define all organizational interfaces and the procedures to be
42、 employed for managing the contract and the site. 4.2 Site location The specification should describe the geographical location of the site which may include surveying points, the previous use of the site and any local features such as impact of industrial or military activities and planning restric
43、tions. Where applicable, the specification should indicate site datum on specification drawings and specify site and drawing orientation and define coordinate axes (x, y, z) and numbering order to ensure consistency between suppliers of connected equipment. Where appropriate, the specification shoul
44、d define the permitted ground loading, dimensional and time restrictions on access routes up to but not including public roads or railways. The specification should identify, where appropriate, the environment of the site in which the equipment will operate. The following factors may normally be inc
45、luded if appropriate: - climatic e.g. atmospheric pressure, annual variation of air and cooling water temperature, relative - geological e.g. seismic conditions and characteristics of subsoil (e.g. caverns, gliding stratifications, - geographic e.g. elevation, influence of local topography and struc
46、tures; - hydrological e.g. flooding and tides. humidity, rain fall, icing, snow, wind velocity (normal and maximum), lightning; load bearing capability of subsoils); OSSI 01-2000 STD-BSI BS EN 45510-b-b-ENGL 2000 I lb24bb9 082453b 459 m Page 10 EN 45510-6-6:1999 4.3 Equipment task The specification
47、should describe in general terms the function, task or role of the equipment to be purchased, e.g. whether it is part of a new power generating plant, a modification to an existing power generating plant, or replacement equipment. Where appropriate, the specification should define the function and t
48、he known limitations, if any, in the equipment connected to that which is being supplied so that the equipment may avoid imposing adverse conditions or the supplier may suggest modifications to connected equipment which would ensure satisfactory operation. 4.4 Equipment to be purchased The specifica
49、tion may define the equipment type or arrangement to be purchased, for example: - type of cooling tower: wet cooling, weffdry (hybrid) cooling; - type of draught: natural draught, forced draught, induced draught; - operating mode of the cooling system: once-through, closed circuit, mixed; - cooling process: counterflow, crossflow, cross-counterfiow; - shape of cooling tower: hyperbolic, circular, cellular. The specification may also define preferences for equipment types (or give information) regarding compatibility with existing equipment, if required. For example, the s
