1、August 2011DEUTSCHE NORM Normenausschuss Wasserwesen (NAW) im DINDIN-SprachendienstEnglish price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale
2、for German Standards (DIN-Normen).ICS 93.025!%ju“2027182www.din.deDDIN 1988-100Codes of practice for drinking water installations Part 100: Protection of drinking water, drinking water quality control;DVGW code of practice,English translation of DIN 1988-100:2011-08Technische Regeln fr Trinkwasser-I
3、nstallationen Teil 100: Schutz des Trinkwassers, Erhaltung der Trinkwassergte; Technische Regel desDVGW,Englische bersetzung von DIN 1988-100:2011-08Directives techniques relatives aux installations deau potable Partie 100: Protection de leau potable, maintien de la qualit de leau potable; Directive
4、 technique DVGW,Traduction anglaise de DIN 1988-100:2011-08Together with DIN EN1717:2011-08,supersedesDIN 1988-4:1988-12www.beuth.deDocument comprises 19 pages10.14 DIN 1988-100:2011-08 2 A comma is used as the decimal marker. Contents Page Foreword 3 1 Scope 5 2 Normative references 5 3 Backflow of
5、 used water .6 4 Connection .6 5 External influences 7 6 Materials .8 7 Stagnation 9 8 Harm caused by inadequate or improper maintenance 10 9 Separation by single or double walls . 10 9.1 Connection or installation of water heaters . 10 9.2 Types of water heater . 10 10 Protection units . 12 11 Poin
6、t-of-use protection for equipment at the draw-off point for domestic use . 12 12 Point-of-use protection of equipment for non-domestic uses . 12 Annex A (normative) List of protection units 13 Bibliography . 19 DIN 1988-100:2011-08 3 Foreword This standard has been prepared by Working Committee NA 1
7、19-04-07 AA Husliche Wasserversorgung of the Normenausschuss Wasserwesen (Water Engineering Standards Committee). This standard has been prepared in agreement with the DVGW Deutscher Verein des Gas- und Wasserfaches e.V. (German Association of Gas and Water Engineers). It has been included in its bo
8、dy of technical rules and codes of practice for water. In response to the publication of European Standards on drinking water installations developed by Technical Committee CEN/TC 164 “Water supply” which were adopted as national standards (DIN EN 806 series and DIN EN 1717), the German national com
9、mittee decided to review the content of the DIN 1988 series “Codes of practice for drinking water installations” with the intention of preparing a comprehensive and consistent set of standards. To make up for the fact that the standards developed at European level did not reach the depth required by
10、 users in Germany, it was necessary to develop supplemental German Standards which continue to be numbered DIN 1988 for reasons of consistency. Because work on the national supplemental requirements began at different times depending on their necessity, and because new editions of the DIN 1988 stand
11、ards needed to be published to cover areas not dealt with in the European Standards, the DIN 1988 standards cannot all be published at the same time. In order to distinguish the “new” DIN 1988 series from the previous one, the individual parts of the series have now been assigned three-digit numbers
12、. The draft of the present standard was published as E DIN 1988-400 in July 2008. However, the final standard has been assigned the number DIN 1988-100 to reflect the correspondence of the national supplemental requirements with the relevant European Standards. This standard supersedes DIN 1988-4, w
13、hich had to be applied together with DIN EN 1717 for a certain period, and has adopted those specifications of DIN 1988-4 (now withdrawn) that deal with the design and installation of drinking water installations not covered in EN 1717. DIN 1988-100 is only to be used together with DIN EN 1717:2011-
14、08 and contains information on how to apply EN 1717 in Germany. It includes a list of examples of protection units recommended for use in domestic and non-domestic drinking water installations. In contrast to the specifications of National Annex NA to DIN EN 1717:2001-05, backflow prevention devices
15、 at floor level (i.e. installed in main branch pipes) consisting of a check valve and a type D or E anti-vacuum valve as in DIN 3266-1 and DIN 3266-2 are no longer to be considered as safety devices as in this standard. Furthermore, type A (corrosion-protected) water heaters are no longer included h
16、ere, and other specifications have been updated. The list in Annex A includes protection units for domestic and non-domestic applications, sorted in analogy to the fluid categories in DIN EN 1717:2011-08. When connecting electrical washing machines and dishwashers to drinking water installations, DI
17、N EN 61770 (VDE 0700 Part 600) should be observed. It should be noted that the headings of the main clauses have been taken from DIN EN 1717:2011-08 and are supplemented by the present standard. DIN 1988-100:2011-08 4 Amendments This standard differs from DIN 1988-4:1988-12 as follows: a) together w
18、ith the National Annex to DIN EN 1717:2001-05 all specifications have been updated; b) the specifications have been editorially revised; c) DIN EN 1717 has been re-published. Previous editions DIN 1988: 1930-08, 1940-09, 1955-03, 1962-01 DIN 1988-4: 1988-12 DIN 1988-100:2011-08 5 1 Scope This standa
19、rd, in conjunction with DIN EN 1717, specifies requirements regarding the protection of drinking water against pollution in drinking water installations and protection units designed to prevent such pollution by backflow. It supplements the specifications of DIN EN 1717 and specifies additional requ
20、irements for the planning and design of drinking water installations, giving due consideration to German national technical rules. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. F
21、or undated references, the latest edition of the referenced document (including any amendments) applies. DIN 1986-100, Drainage systems on private ground Part 100: Specifications in relation to DIN EN 752 and DIN EN 12056 DIN 1988-600, Codes of practice for drinking water installations Part 600: Dri
22、nking water installations in connection with fire fighting and fire protection systems (DVGW Code of practice) DIN 1989-1, Rainwater harvesting systems Part 1: Planning installation, operation and maintenance DIN 2001-1, Drinking water supply from small units and non-stationary plants Part 1: Small
23、units Guidelines for drinking water, planning, construction, operation and maintenance of plants (DVGW Code of practice) DIN 2001-2, Drinking water supply from small units and non-stationary plants Part 2: Non stationary units Guidelines for drinking water, planning, construction, operation and main
24、tenance of units (DVGW Code of practice) DIN 4753-11, Water heaters and hot water systems for drinking and service water Indirect heat exchangers Requirements, testing and marking DIN EN 806-4, Specifications for installations inside buildings conveying water for human consumption Part 4: Installati
25、on DIN EN 806-5, Specifications for installations inside buildings conveying water for human consumption Part 5: Operation and maintenance DIN EN 1717:2011-08, Protection against pollution of potable water in water installations and general requirements for devices to prevent pollution by backflow (
26、DVGW Code of practice) DIN EN 12897, Water supply Specification for indirectly heated unvented (closed) storage water heaters DVGW W 216, Versorgung mit unterschiedlichen Trinkwssern (Water supply from different sources)1)DVGW W 555, Nutzung von Regenwasser (Dachablaufwasser) im huslichen Bereich (H
27、arvesting of rainwater in domestic applications)1) DVGW W 570-2, Armaturen fr die Trinkwasser-Installation Teil 2: Anforderungen and Prfungen fr Sicherungsarmaturen (Valves for use in water installations Part 2: Check valves)1)Verordnung ber die Qualitt von Wasser fr den menschlichen Gebrauch (Trink
28、wV) (Ordinance on the quality of water intended for human consumption)2)1 Verordnung ber Allgemeine Bedingungen fr die Versorgung mit Wasser (AVBWasserV) (Ordinance on general conditions for the supply of water)2)2 1) Obtainable from Wirtschafts- und Verlagsgesellschaft Gas und Wasser mbH, Postfach
29、14 01 51, 53066 Bonn, Germany. 2)Obtainable from Beuth Verlag GmbH, 10772 Berlin, Germany. DIN 1988-100:2011-08 6 3 Backflow of used water DIN EN 1717:2011-08, 4.1, shall be supplemented as follows: By complying with the requirements of this standard and other relevant codes of practice, it is ensur
30、ed that the provisions laid down in the Trinkwasserverordnung 1 regarding the quality of drinking water in a drinking water installation are met from the point of delivery up to the draw-off point. Installations not in accordance with this standard or inappropriate operation of the installation can
31、change the drinking water so that it becomes impaired or represents a health hazard. As regards the analysis of risks DIN EN 1717 does not make any distinction between impairment and health hazards. An impairment is understood to be a change in drinking water quality that does not represent a health
32、 hazard, whilst a health hazard is deemed to exist if the water quality changes in such a way that can lead to damage to human health. Changes in drinking water can have a direct or indirect impact on consumers, for example where, for apparatus operated with working or auxiliary materials when conne
33、cted to or integrated into drinking water pipes, in the event of damage there is a risk of substances migrating into the drinking water. For the consumer, this case represents a direct impairment or health hazard if the water drawn from the apparatus (e.g. water heater) is used as drinking water. Ev
34、en if the water drawn from that apparatus is not used as drinking water, an indirect impairment or health hazard can arise; substances that have escaped from a faulty apparatus can flow back in case of malfunction (e.g. as a result of insufficient pressure or pipeburst) and can still be present in t
35、he drinking water drawn off by the consumer even when correct operation has been restored (e.g. in the case of apparatus in which chemicals are dissolved using drinking water). 4 Connection DIN EN 1717:2011-08, 4.2, shall be supplemented as follows: A connection between a public drinking water suppl
36、y system and another drinking water system, e.g. one conforming to DIN 2001-1, is not permitted. Any measures to supply drinking water in emergency situations, e.g. for hospitals, shall be agreed on a case-by-case basis with the drinking water supplier and the public health authority, taking into ac
37、count the specifications of DVGW W 216. The connection of non-stationary equipment as in DIN 2001-2 is permitted only where suitable protection units are provided. The Trinkwasserverordnung 1 stipulates that the responsible authorities be notified at least four weeks in advance when a drinking water
38、 installation is put into service in buildings supplying water to the public, when there is a structural or technical modification to such a system or its operation is altered, and when there is a change of owner or use. The connection of a drinking water supply system to a system supplying non-pota
39、ble water is not permitted. Drinking water shall only be fed via a type AA (unrestricted air gap) or type AB (air gap with overflow non-circular (unrestricted) protection unit as in DIN EN 1717:2011-08, 5.7.3. The protection unit shall be installed outside the non-potable water cistern and/or the ma
40、nhole to prevent flooding (see Figure 1). The overflow of the protection unit shall be installed so that the drain of water is perceptible, with due consideration being given to DIN 1986-100. Drinking water and non-potable water pipes and draw-off points shall be marked differently and all readily a
41、ccessible draw-off points shall be secured against unauthorized use. Rainwater harvesting systems shall conform to DIN 1989-1 and DVGW W 555. The Trinkwasserverordnung 1 stipulates that the responsible authorities shall be notified prior to any commissioning of non-potable water installations in con
42、junction with a drinking water installation. The AVBWasserV 2 stipulates that the client is to inform the drinking water supplier prior to any installation of a private self-supply system. DIN 1988-100:2011-08 7 Key 1 Drinking water or non-potable water from a separate supply system 2 Drinking water
43、 from a central supply system 3 Connection 4 Protection unit AA or AB Figure 1 Indirect connection of different types of installation via underground cistern (schematic) 5 External influences DIN EN 1717:2011-08, 4.3, shall be supplemented as follows: To prevent drinking water in pipes from being po
44、lluted by wastewater, the following shall be observed: Drinking water pipes shall not be laid in or passed through sewage or soaking pits, shafts for site drainage, wastewater pipes and similar installations. Drinking water pipes shall be laid at a distance of at least 0,2 m from site drainage syste
45、ms. Where this distance cannot be maintained, special protective measures shall be taken in agreement with the drinking water supplier. Where the distance between drinking water pipes and sewers is 1 m or less, the drinking water pipes shall not be laid deeper than the wastewater pipes (see Figure 2
46、). DIN 1988-100:2011-08 8 Key 1 Zone in which drinking water pipes shall only be laid where special protective measures are taken 2 Zone in which drinking water pipes shall not be laid a Diameter of private site drainage pipe b External diameter of drinking water pipe c Minimum distance: 0,2 m d Min
47、imum distance if drinking water pipe is located below wastewater pipe: 1 m Figure 2 Dimensions where drinking and wastewater pipes are laid in parallel When selecting pipe materials, account shall be taken of any hazards (e.g. arising from soil contaminated with mineral oil, the effect of UV radiati
48、on, wood preservatives, pesticides, solvents). Where necessary, pipes shall be ducted. Where the outlet of flushing and drainage facilities is so located that there is a risk of backflow of wastewater, there shall be protection against the ingress of water from the outside, and protection against flooding when located in shafts, for example. It shall be noted that water quality can be adversely affected by radiation (e.g. where water comes into contact with radioactive substances), by diffusi
