1、STD-BSI BS EN 1508-ENGL 1777 811 Lb24bL7 075Lt53b Water supply - Requirements for systems and components for the storage of water The European Standard EN 1508:1998 has the status of a British Standard ICs 13.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW 2TLi 111 BS E
2、N 1508:1999 STD-BSI BS EN L508-ENGL 1777 Lb2Libb 0754537 130 W BS EN 16081999 been prepared under the direction of the Sector AmdNo. Committee for Buiiing and Civil Engineering, was pubiished under the authority of the Standards Committee and comes into effect on 16 March 1999 O BSI 03-1999 ISBN O 6
3、80 30991 6 National foreword This British Standard is the English ianguage version of EN 15081998. Date Text affected The UK participation in its preparation was entrusted by Technical Committee W504, Water supply, to Subcommittee BOUl, Water supply - External systems and components, which has the r
4、esponsibility to: - aid enquirers to understand the te, - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests inform - design; - general requirem
5、ents for product standards; - requirements for checks, testing and commissioning; - operational requirements; - requirements for rehabilitation and repair. The requirements of this standard are applicable to: - the design and construction of new reservoirs; - the extension and modification of existi
6、ng reservoirs, - significant rehabilitation of existing reservoirs. NOTE 1 altered to comply with this standard, provided that there are no significant dehimentai effects on water qualiw. NOTE 2 This standard does not apply to reservoirs formed by the building of dams or the use of lakes for water s
7、torage purposes. It is not intended that existing reservoirs are to be 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are lis
8、ted hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard oniy when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. prEN 8051996, Water supply
9、- Reguirements for systems and components outside budings. 3 Denitions For the purposes of this standard, the following definitions apply. Page 3 EN 15081998 3.1 capacity the total volume of the comparhnent(s) which can be used for the operation of a reservoir 3.2 compartment seif-contained part of
10、a reservoir which has separate inlet, outlet, overflow and washout arrangements, and can be operated independently from other compartments of the same reservoir (see Figures 1 and 2) 3.3 control building self-contained part of a reservoir used to accommodate the main valves, pumps, controls and moni
11、toring equipment and which can provide the means of access to the water compartment(s) 3.4 des i gn e r the person responsible for establishing, with the purchaser or water company, the basic criteria to be used for the design, construction, commissioning and operation of the reservoir 3.6 elevated
12、reservoir a reservoir constructed with the compartment(s) at ground level, but at an elevation sufficient to provide water by gravity to the supply area 3.6 rehabilitation work necessary to upgrade or improve a reservoir to comply with this standard 3.7 repair work necessary to remedy a defect and r
13、estore a reservoir to satisfactory operation 3.8 reservoir storage facility for water 3.9 service reservoir covered storage facility for potable water which includes water comparment(s), control building, operation equipment and access arrangements, providing reserve supplies and pressure stability,
14、 and balancing demand fluctuations (see Figure 1) 3.10 water demand estimated quantity of water required per unit of time 3.11 watertightness the characteristic quality of the structure that prevents the passage of water through the sincture in excess of any permitted quantity O BSI 03-1999 Page 4 E
15、N 1608:1998 1 14 f 7 3 4 5 13 1 ventilation 2 max. water level 3 max. operational water level 4 capacity 6 max.watrdepth 6 dopingfloor 7 overflow 8 inlet 9 outlet 10 by-pass valve 11 sump 12 washouloveriow 13 underfloor drains (if required) 14 perimeter drain (if required) Figure 1 - Simplified sect
16、ion through a service reservoir 4 Application of standards and regnlations In all aspects, including health and safety, the donal standanis, transposing European Standards as avdable shall apply as weil as the regulations valid at the piace where the system is bei constructed andor operated. 5 Gener
17、al requirements 6.1 General This standar is written principally for application to service reservoirs. In the case of other reservoirs the designer or operator will determine which parts of the standard shali apply e.g. disinfection may not be required for reservoim containing water not for human co
18、nsumption. 6.1.1 Functions (See also A.l.) The purpose of service reservoirs is to store the necessary amount of water required for water supply in the area concerned. To achieve this their functions include: - to equalize the difference between water intake and output and to cover peaks in demane -
19、 to maintain the required pressure in the water distribution systems; - to keep stocks in reserve in case of plant malfunctions and jntrruptions in.the water distribution systems; - to provide water for fre fighting in accordance with local requirements. O BSI 03-1999 STD-BSI BS EN 1508-ENGL 1799 =
20、lb24bb7 0754542 5T8 W 6.1.2 Decision criteria and sustem cortfi;guration (See also A.2.) Important decision criteria are: - security of supply and water quality; - overall cost of construction, operation and maintenance; - integration into the water supply system; -town and landscape planning. The a
21、bovementioned criteria can be achieved by elevated service reservoirs, water towers or by low level service reservoirs with pumping systems. Service reservoirs may be designed as buried, parhally buried or above ground stsuctures. The construction of an elevated service reservoir is advisable if sui
22、table high ground is available. The construction of a water tower may be considered where the necessary ground elevation at a suitable point near the supply area is not available for an elevated service reservoir. A pumping station with a low level service reservoir is a viable option if measures ha
23、ve been taken to ensure continuity of power supply Service reservoirs are mainly constructed from reinforced or prestressed concrete. They may also be constructed using steel, glass fibre reinforced plastics or other appropriate materials. 6.2 Functional requirements 6.2.1 Functional requirements -
24、Water qualitg 6.2.1.1 Generd Service reservoirs shall be designed, constructed and operated to prevent contamination or other chemical, physical and biological changes that are detrimental to the water quality. (Refer to water quality regulations.) 6.2.1.2 Materials Materials which meet appropriate
25、test requirements and which will not cause the stored water to fail to comply with the requirements of appropriate EU Directives or EFTA Regulations shall be used in the structure of the water compartments and in the surfaces in contact with the stored water. Concrete and cement morkm generally sati
26、sfy this requirement but special care shall be taken if additives are used In order to facilitate subsequent cleaning and to avoid bacterial growth, internal surfaces shall be as smooth and pore-free as possible. This can be achieved by high quality concrete finishes or by the application of suitabl
27、e coatings or linings. AU metallic parts vulnerable to corrosion shall be protected. 6.2.1.3 Water ekculution Stagnant zones shall be minimized. This can be achieved by suitable design of the physical shape of the water compartments and the arrangement of inlet and outlet pipework for the particulas
28、 storage capacity. Page 5 EN 15081998 6.2.1.4 Vent.ilation Ventilation facilities are required in the water compartments in order to pennit air movement caused by changing water levels. This may be achieved by natural or forced ventilation. If specified by the designer measures shall be taken to saf
29、eguard and control the quality of the air entering or leasing the service reservoir. 5.2.1.6 Prevention of contuminution Service reservoirs shall be designed to prevent the ingress of external water or other contaminants either through the structure or any opening, entrance or pipework. Permanent ex
30、posure of the water to daylight shall be avoided. Entrances and ventilation equipment shall also be designed so that the water cannot be contaminated (e.g. by polluted air, dust, insects and other animals). Design may spec that openings shall not be positioned directly above the free water surface.
31、Wherever positioned they shall be arranged in such a way that no extraneous matter is able to enter the compartment and that all external interference is impeded. 6.2.1.6 Temperature effects There shall be no unacceptable alteration to the stored water caused by heat or cold. Thermal insulation meas
32、ures may need to be taken to avoid adverse effects on the stored water, the structure and the associated equipment. The thermal insulation measures for service reservoirs shall be appropriate for the local climatic conditions, the operating requirements and in order to minimiie condensation withii t
33、he water compartments. 5.2.1.7 Maintainiw water quality Prior to commissioning, the service reservoir and the associated equipment shall be carefully checked, cleaned and disiiected. Inspections shall be carried out before initial commissioning, during operation and as part of regular maintenance. F
34、acilities to allow the sampiing of water, without entry by personnel, shall be provided for each compartment, and if specified by the designer for the inlet and outlet pipes. 6.2.2 Functional requirements - Operation 6.2.2.1 Access and security (See also A.3.) Service reservoir sites shall be provid
35、ed with access for routine visits and repair work Facilities shall be provided to permit cleaning of each compartment independently Access to the water compartments, control buildings and all functional equipment shall be designed for safety, including that of personnel, and for ease of operation. O
36、penings shall be dimensioned so as to permit entry for materials and equipment for cleaning, maintenance and repair. O BSI 03-1999 STD-BSI BS EN 1508-ENGL 1999 LbZqbb7 075115113 q311 D Page 6 EN 1508:1998 Access to the reservoirs shall always be restricted and controlled Arrangements - structures wh
37、ere watertightness is achieved by the structure itself, to which a coating has been added - structures where watertighlmess is achieved by the addition of a waterproof coating, or lining which may either be bonded to, or independent from, the supporting structure. For structures using prefabricated
38、component parts, watertightness may be achieved using the above techniques. Special attention shall be paid to construction and movement joints, pipes or ducts passing through structural elements and other features subject to water pressure. This shall include the use of appropriate waterstops and s
39、ealants. 6.2 Structural design 6.2.1 General In all aspects, including health and safety, the valid national design and construction standards and requirements at the place where the reservoir is proposed to be constructed shall apply until such time as the implementation of the relevant sh-uctural
40、Eurocodel). These shall be based on the acceptable probability that the structure wii remain fit for the use for which it is intended throughout its design life. This involves calculation at limit states. Page 7 EN 1508:1998 6.2.2 Limit states Ultimate limit states which may require consideration in
41、clude: - loss of equilibrium of the structure or any part of it, considered as a rigid body; - failure by excessive deformation, rupture, or loss of stability of the structure or any part of it, including supports and foundations. Serviceability hit states which may require consideration include: -
42、deformations or deflections which affect the appearance or effective use of the structure (including the malfunction of machines or services) or cause damage to finishes or non-structural elements, - cracking which is likely to affect adversely the appearance, durability or watertightness of the str
43、ucture; - vibration which causes discomfort to people, damage to the service reservoir or to its components, or which limits its functional effectiveness; - excessive stress which is likely to lead to loss of durability 6.2.3 Actions 6.2.3.1 Geneml The stxuctural design shail take into account the e
44、ffects of permanent, variable and accidental actions. The reservoir and its compartments shall be designed for both the full and empty conditions. 6.2.3.2 Permanent actions These include: - the dead load of the ctsucture; - the load of the operational equipment and plant (e.g. pumps and pipework); -
45、 the load of any aditional installations; - the prestressing load, - the earth load and earth pressure; - the load and pressure of the groundwater at its lowest assumed levei; - any imposed displacement; - shrinkage; - creep. and, where applicable: ) Eurocodes 1 to 9 (ENV 1991 to 1999) in preparatio
46、n by CEN/TC 250. O BSI 03-1999 STD.BS1 BS EN LSOA-ENGL 1993 I Lb24bb9 075Y545 207 Page 8 EN lm1998 6.2.3.3 VaWk actions These include: - the load and pressure of the water in the reservoir; - the snow and wind loads; - the loads due to operation of the reservoiq - the loads due to maintenance; - the
47、 load and pressure of the groundwater at its highest assumed level; - transient loads in the vicinity of the stsucture, - the loads at the time of constmctioq - temperature variations both inside and outside the reservoir, taking into account climatic extremes and seasonal or operational vanations i
48、n the tempeme of the stored wateq - the thermal gradient between pasts of the structure exposed to Mering climatic conditions. Vle actions not defhed by this stanard shall be specined by the designer. 6.2.3.4 Atxiental actions “hese include, where applicable, earthquakes and other accidental actions
49、 such as avalanches, forest fires, vehicle and aircd impact etc. The technical data to be taken into account shall be defined by the designex 6.3 Further provisions 6.3.1 Stress analysis The dresses shall be calculated under the relevant load combinations using appropriate strue design methods. For those parts of the structure designed to retain water and for serviceabii limit state verications the calculations are normally carried out using the assumption of linear eMc behaviour of materials. Where necessary - cleaning and disinfectioq - putting into service. - w
