ImageVerifierCode 换一换
格式:PDF , 页数:14 ,大小:252.04KB ,
资源ID:714349      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-714349.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(EN 14622-2005 en Devices to prevent pollution by backflow of potable water - Air gap with circular overflow (restricted) - Family A type F《防饮用水回流污染的装置 带圆形溢流口的气隙(受限的) F型A族》.pdf)为本站会员(unhappyhay135)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

EN 14622-2005 en Devices to prevent pollution by backflow of potable water - Air gap with circular overflow (restricted) - Family A type F《防饮用水回流污染的装置 带圆形溢流口的气隙(受限的) F型A族》.pdf

1、BRITISH STANDARDBS EN 14622:2005Devices to prevent pollution by backflow of potable water Air gap with circular overflow (restricted) Family A, type FThe European Standard EN 14622:2005 has the status of a British StandardICS 13.060.20; 91.140.60g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3

2、g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14622:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 26 January 2006 BSI 26 January 2

3、006ISBN 0 580 47619 7National forewordThis British Standard is the official English language version of EN 14622:2005.The UK participation in its preparation was entrusted by Technical Committee B/504, Water supply, to Subcommittee B/504/14, Backflow prevention, which has the responsibility to: A li

4、st of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Stand

5、ards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard

6、does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European develo

7、pments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued

8、 since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14622May 2005ICS 13.060.20; 91.140.60English versionDevices to prevent pollution by backflow of potable water - Airgap with circular overflow (restricted) - Family A, type FDispositifs de protection contre la p

9、ollution de leau potablepar retour - Surverse avec trop plein circulaire (limite) -Famille A, type FSicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmutzung durch Rckflieen - Freier Auslaufmit kreisfrmigem berlauf (eingeschrnkt) - Familie A,Typ FThis European Standard was approved by C

10、EN on 25 March 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards ma

11、y be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Centr

12、al Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland

13、, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reser

14、vedworldwide for CEN national Members.Ref. No. EN 14622:2005: EEN 14622:2005 (E) 2 Contents Page Foreword 3 Introduction4 1 Scope .5 2 Normative references .5 3 Terms and definitions.5 4 Designation .6 5 Symbolization7 6 Materials 7 7 Requirements 7 8 Marking (not required for site constructed produ

15、cts)10 9 Technical documents .10 EN 14622:2005 (E) 3 Foreword This European Standard (EN 14622:2005) has been prepared by Technical Committee CEN/TC 164 “Water supply“, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publi

16、cation of an identical text or by endorsement, at the latest by November 2005, and conflicting national standards shall be withdrawn at the latest by November 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to impleme

17、nt this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. E

18、N 14622:2005 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this European Standard: a) this European Standard provides no information as to whether the produce may be used without restriction in any

19、of the Member state of the EU or EFTA; b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. EN 14622:2005 (E) 5 1 Scope This European Standard specifies th

20、e characteristics and the requirements of air gaps with circular overflow (restricted) family A, type F for nominal flow velocity not exceeding 3 m/s. Air gaps are devices for protection of potable water in water installations from pollution. This document applies to air gaps in factory assembled pr

21、oducts and to constructed air gaps in situ, and defines the physicochemical characteristics of materials of construction used for the purpose and application to ensure compliance with this document during normal working use. 2 Normative references The following referenced documents are indispensable

22、 for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1717:2000, Protection against pollution of potable water in water installations and general requir

23、ements of devices to prevent pollution by backflow. 3 Terms and definitions For the purposes of this European Standard, the terms and definitions of EN 1717:2000 and the following apply. 3.1 air gap with circular overflow (restricted) family A, type F a permanent and vertical distance between the lo

24、west point of the feed orifice and the critical water level or the top of the overflow having a circular overflow capable of draining the maximum inflow of water under fault condition NOTE See Figure 1 for the design principle. Figure 1 Design principle 3.2 spillover level level at which water will

25、start to overflow the receiving vessel with all outlets closed EN 14622:2005 (E) 6 3.3 critical water level physical or piezometric level of liquid reached in any part of the appliance 2 s after closing the water inlet starting from the maximum level 3.4 dimension h height between the spillover leve

26、l and the critical level 3.5 maximum level highest water level H reached above the spillover level under positive pressure fault condition with all outlets closed 3.6 splashing (requirements for protection) when maintaining the maximum flow rate at the maximum level if a contact is observed between

27、the upstream component and the liquid in the receiving vessel due to splashing, foaming or turbulence, the air gap shall be increased to a point where no contact is observed 3.7 diameter of feed pipe (Bore D) diameter D is the maximum internal diameter within the last metre of the supply device and

28、the connecting pipework or the DN of the inlet connection 4 Designation An air gap with circular overflow (restricted) family A, type F is designated by: name; reference to this European Standard; denomination (see 3.7 DN or D); family and type;. Example for a designation of an air gap with circular

29、 overflow (restricted) Family A (A), Type F (F), DN 15 Air gap, EN 14622, Family A, Type F, DN 15 EN 14622:2005 (E) 7 5 Symbolization Figure 2 Graphic symbol 6 Materials The manufacturer shall state the type of materials chosen in his technical and commercial documents. The materials used in water i

30、nstallations, including the materials of protection units in contact with drinking water, shall satisfy the European standards and national acceptance criteria and/or national restrictions for use currently in force in EU and EFTA. They shall be compatible with each other, with the water supplied an

31、d with the fluids or substances that can come into contact with them. There are no special requirements concerning the materials downstream of the atmospheric outlet opening provided they do not have any harmful effect on the upstream part. 7 Requirements 7.1 General The protection assembly comprise

32、s four parts: water inlet device; receiving vessel (container); overflow; air break to drain. 7.2 Water inlet device Every feed pipe, float-operated valve or other device which controls the inflow of water to a receiving vessel shall be securely and rigidly fixed to maintain the air gap. Every feed

33、pipe supplying water to such a valve assembly or other device shall be fixed in its position to prevent it from moving or buckling. The feed pipe, the inlet device and the outlet of the inlet device shall not come into contact in any way with a product from downstream, they shall always be above lev

34、el H (see Figure 3). Submerged supply pipes to the inlet device are not permitted. EN 14622:2005 (E) 8 Key 1 Feed pipe 2 Feed orifice 3 Receiving vessel 4 Spillover level 5 Critical level (distance h) 6 Overflow pipe 7 Air break to drain A Air gap (distance) D Internal diameter of feed pipe (bore) H

35、 Maximum level Figure 3 Air gap with circular overflow (restricted) family A, type F 7.3 Overflow arrangements The area of the minimum cross section of the overflow pipe throughout its length shall be equal to four times the inlet pipes (D) cross sectional area. All circular overflow arrangements sh

36、all ensure an air break prior to any connection to a drainage system. An air break to drain shall be provided see EN 1717, Clause 9. 7.4 Air gap distance 7.4.1 Single supply For air gaps family A, type F the critical water level (h) shall be established and the air gap distance A measured from the l

37、owest point of the water inlet to the critical water level (see Figure 3). The air gap distance A shall be 2 D and never less than 20 mm and can be determined by one of the following methods: EN 14622:2005 (E) 9 a) h is determined by test measurement of the depth of water above the spillover level o

38、f the overflow 2 s after the inflow equal to Q = 0,14 D2in l/min has stopped or a dynamic pressure of 1 MPa (10 bar) has stopped if the flow rate Q cannot be achieved. Where D is the inlet bore (see 3.7) and with all outlets (except the overflow) closed, based on a velocity of 3 m/s, or the maximum

39、recommended flow rate for manufactured appliances when the flow rate is higher than Q; b) by measurement of the air gap distance A from the lowest point of the water inlet device and the uppermost point of the overflow outlet bore. 7.4.2 Multiple supplies In the case of multiple feed pipes to a sing

40、le vessel having a circular unrestricted overflow, the distance of the air gaps for the potable water supply shall be dimension A above the critical water level. The critical water level (3.3) shall be determined with all feed pipes discharging at an individual inflow calculated at Q = 0,14 D2. If t

41、he flow rate Q cannot be achieved, apply dynamic pressure of 1 MPa (10 bar) on all inlets. No feed orifice shall be less than distance A above the critical water level. After calculations the distance A shall not be less than 20 mm. For calculating air gap distance A use =22 DA 7.4.3 Backflow/back p

42、ressure If the receiving vessel can be subject to positive pressure backflow, it is important that the inlet orifice is positioned so that it cannot be contaminated by the ascending/returning backflow fluid. When the air gap is part of an installation which can generate positive pressure backflow it

43、 is essential that a means of limiting the flow rate to a rate which will not compromise the overflow arrangement is incorporated, i.e. non-return valve fitted upstream of the pressurisation unit. Potable water inlets shall terminate at a higher level than non-potable inlets and never closer than 2

44、D measured horizontally and vertically downward. 7.5 Verification 7.5.1 General Verification can be achieved by test or by measurement. 7.5.2 Procedure for verification by test See 7.4.1 and 7.4.2. a) Sequence of test close all outlets (except the overflow); identify D; calculate Q; apply flow rate

45、Q and maintain maximum water level; note contact with inlet device(s) during filling and at the maximum level; stop flow rate Q; after 2 s establish distance h; measure air gap between distance h and lowest point of the feed orifice. b) Requirements: EN 14622:2005 (E) 10 no contact between the downs

46、tream fluid and the inlet device(s); the air gap A shall be 2 D and never less than 20 mm. 7.5.3 Procedure for verification by measurement (single supply only) a) Sequence of measurement see 7.4.1 (b). b) Requirements the measured air gap shall meet the requirements of dimension A (see 7.4.1). 8 Mar

47、king (not required for site constructed products) Each appliance incorporating an air gap with circular overflow (restricted) family A, type F shall be clearly and permanently marked and accessibly visible. Marking shall indicate: a) manufacturers brand or logo; b) letter indicating family and type

48、of air gap; c) denomination (DN or D); d) reference to this European Standard. Following information to be given where possible e) reference (type or model, etc.); f) serial number. 9 Technical documents The manufacturers documentation shall include the appropriate installation requirements to ensur

49、e the air gap is not compromised, including positive pressure backflow. blankBS EN 14622:2005BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the lates

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1