DIN 50934-1-2000 Corrosion of metals - Methods for evaluation of efficiency of water treatment apparatus for corrosion protection - Part 1 General《金属的腐蚀 水处理设备腐蚀防护效果的评定方法 第1部分 总则》.pdf

1、ICS 77.060Korrosion der Metalle Verfahren zur Beurteilung der Wirksamkeit von Wasserbehandlungsanlagen zumKorrosionsschutz Teil 1: AllgemeinesForewordThis standard has been prepared by Technical Committee Korrosion und Korrosionsschutz of the Normen-ausschuss Materialprfung (Materials Testing Standa

2、rds Committee).IntroductionWater treatment equipment for inhibiting corrosion within drinking water systems can be used to reduceseveral types of corrosion effect. The effectiveness of the equipment must be checked separately for eacheffect it is intended to remedy. This standard therefore specifies

3、 different test methods and arrangementsfor each treatment purpose; however, all tests involve comparing the operation of pipe systems with treatedwater to that with untreated water.The objective of corrosion control may be toa) alter the quality of the drinking water,b) reduce the amount of materia

4、l removed from components of the system,c) improve corrosion behaviour in terms of localized corrosion,d) form a protective layer, or toe) remove scale from the pipe system.Ref. No. DIN 50934-1 : 2000-04English price group 05 Sales No. 010503.01DEUTSCHE NORM April 200050934-1Continued on page 2. No

5、part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e.V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).Methods of evaluating the effectiveness of watertreatment equipment for

6、 corrosion controlPart 1: GeneralTranslation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.1 ScopeThis standard describes general aspects of the methods of evaluating the effectiveness of water treatmentequipment used to protect co

7、mponents in drinking water systems from corrosion. Such components in-clude valves, tanks and reservoirs, pipes and pipe fittings.2 Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriat

8、e places in the text, and the titles of the publications arelisted below. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this standard only when incorporated in it by amendment or revision. For undated references, thelatest edition of the publication

9、 referred to applies.DIN 50930-1 Corrosion behaviour of metallic materials in contact with water General3 ConceptsFor the purposes of this standard, the concepts defined in DIN 50930-1 apply, as well as the following.Water treatment equipmentAll components and media used to inhibit corrosion in a dr

10、inking water system.Page 2DIN 50934-1 : 2000-044 General4.1 Parameters influencing corrosionThe parameters to be taken into consideration when testing are:a) material-related parameters;b) water-related parameters;c) operating conditions.4.1.1 Material-related parametersSince corrosion effects vary

11、in strength depending on the component materials, and the corrosion process isaffected differently by each material, testing is to be carried out for each material present, and only thoseparameters found in practice are to be considered. The effectiveness of the equipment is to be evaluatedseparatel

12、y for each material and each corrosion effect.4.1.2 Water-related parametersWater used in testing (reagent water) shall be selected taking the component materials and type of corrosionprotection into consideration. See the other parts of DIN 50934 for more details.4.1.3 Operating conditionsTest cond

13、itions shall correspond to the actual operating conditions of the drinking water system, particularlyin terms of the length of time water in cold systems stagnates versus the time it flows; in hot water systems,the circulation time may need to be taken into consideration.4.2 Test procedureThe effect

14、iveness of the equipment is evaluated using test assemblies comprising one or more pipe runsthrough which treated and untreated water is passed, using the specified reagent waters. Some assemblies areattached at the inlet to the treatment equipment under test. It is essential that the assemblies being comparedare operated simultaneously. See the other parts of DIN 50934 for test details such as reagent water param-eters, test duration, and operating conditions.