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Foreword 2 This European Standard shall be given the status of a 1 Scope 3 national standard, either by publication of an identical text or by endorsement, at the latest by July , and 2 Normative references 3 conflicting national standards shall be withdrawn at 3 Definitions 3 the latest by July This standard is not intended to be used for Prolonged or repeated contact of these materials with acceptance criteria and gives no information relating to the skin or any mucous membrane should be avoided.
These normative references are cited at the There is legislation and regulations regarding health, appropriate places in the text and the publications are safety, pollution and storage, etc. For dated references, subsequent amendments to or revisions of any of these 5 General principles publications apply to this European Standard only when incorporated in it by amendment or revision.
For 5. If penetrant inspection is used Viewing conditions1 following another non-destructive testing technique, the surface shall be cleaned carefully to remove contaminants before application. For specific cases, it is necessary to use penetrant testing products complying with particular requirements with regards to flammability, sulfur, halogen and sodium content and other contaminants, see prEN Various test systems exist in penetrant testing. Testing generally proceeds through the following stages: A product family is understood as a combination of the following penetrant testing materials: penetrant, excess a preparation and precleaning see 8.
When tested in b application of penetrant see 8. The assessed level always refers to the be tested. For the requirements of equipment, method used for type testing of the approved product see EN These methods The penetrant testing products shall be compatible remove contaminants from the surface and generally with the material to be tested and the use for which are incapable of removing contaminants from within the part is designed.
In all cases and in particular in the case of shot blasting, care shall be taken to ensure 7. If with each other. Dragout losses shall not be replaced using penetrant 8. Chemical precleaning shall be carried out using 7. Acids and chromates in particular can greatly reduce the fluorescence of fluorescent penetrants and the 7. Therefore, non-metallics can be adversely affected by penetrant chemical agents shall be removed from the surface testing materials; their compatibility has to be under examination, after the cleaning process, using established before inspecting parts manufactured from, suitable cleaning methods which may include water and assemblies that include, such materials.
Care shall be taken to ensure that the test surface 7. Contaminants, e. Especially in the low temperature range there is a danger be removed, if necessary using mechanical or chemical of water condensing in the discontinuities and on the surfaces, methods or a combination of these methods. Precleaning shall ensure that the test surface is free from residues and that it allows the penetrant to enter any discontinuity.
The cleaned area shall be large enough to prevent interference from areas adjacent to the actual test surface. The emulsifying time shall temperature, the material of the part to be tested and not be exceeded. Immediately after emulsification, a the discontinuities to be detected. The penetration time can vary from 5 min to 60 min.
Subsequent cleaning If not, the actual penetration time shall be recorded in with a clean lint-free cloth, lightly moistened with the written test procedure. In no case shall the solvent, shall be then carried out. For 8.
The minimum UV-A irradiance at the test that no penetrant is removed from the discontinuities. When faced with excessive background on parts after 8. Examples: spray rinsing or wiping qualified person.
Care shall be taken to minimize the effect of mechanical action caused by the rinsing 8. Subsequent cleaning excess penetrant removal, using one of the following with a clean lint-free cloth lightly moistened with methods: solvent shall then be carried out.
Any other removal technique shall be approved by the contracting parties, a wiping with a clean, dry, lint-free cloth; particularly when solvent remover is sprayed directly b evaporation at ambient temperature after hot on to the part to be tested. Before If compressed air is used, particular care shall be taken the application of the emulsifier, a water wash should to ensure that it is water- and oil-free and impinging be performed in order to remove the bulk of the pressure on the surface of the part is kept as low as excess penetrant from the test surface and to facilitate possible.
The predetermined emulsifier contact time shall not be exceeded. After emulsification, a final 8. The developer shall be maintained in a uniform 8. To allow the post emulsifiable penetrant to be removed from the test surface, it shall be rendered The application of the developer shall be carried out as water-rinsable by application of an emulsifier.
This can soon as possible after the removal of excess penetrant. The emulsifier contact time shall be evaluated by the user through pre-tests according to the manufacturer's instructions. The developer shall be uniformly applied to and 30 min; longer times may be agreed between the the test surface by one of the following techniques: contracting parties. The test surface shall be thinly covered; local agglomerations are not permitted. Immersion time and 8. The immersion time shall be as short as or as soon as the developer is dry.
This facilitates a possible to ensure optimum results. The spray shall be such that the developer arrives NOTE. The diameter, width or intensity of the indication provide slightly wet on the surface, giving a thin, uniform layer. Sufficient time shall be allowed for the operator's eyes Immersion time and temperature of the developer shall to become dark-adapted in the inspection booth, be evaluated by the user through pretests according to usually at least 5 min.
The immersion time should be as short as possible to ensure an optimum UV radiation shall not be directed in the operator's result. All surfaces which can be viewed by the operators shall not fluoresce.
No paper or cloth which fluoresces under UV light shall be in sight of the operator. The Indication s appear s on the face of the coating viewing conditions shall be such that glare and which was in direct contact with the part. If retesting is necessary, e. It shall include all the procedure, starting with the precleaning, shall be details relating to the method which are important for repeated. The use of a different type this data should be modified, as appropriate, of penetrant or a penetrant of the same type from a depending on the type of part.
If another form is used different supplier is not allowed unless a thorough it shall contain all the information detailed in items a cleaning has been carried out to remove penetrant to h. The test report may be omitted if a test procedure fulfilling the requirements of 8.
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DIN EN 571-1
DIN EN 571-1:1997-03