BS ISO 4987:2020 pdf free.Steel castings一Liquid penetrant testing.
BS ISO 4987 The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.ISO 3059, Non-destructive testing一Penetrant testing and magnetic particle testing一Viewing conditions ISO 3452-1, Non-destructive testing一Penetrant testing一Part 1: General principles ISO 4990, Steel castings一General technical delivery requirements ISO 9712, Non-destructive testing一Qualification and certification of NDT personnel.Subject to agreement between the manufacturer and the purchaser, enquiries and purchase orders for castings requiring liquid penetrant testing should include the following information: a] the area of the casting to be tested; b) the qualification of the operators who will carry out the testing (see 5.2) or interpretation (see 7.2);c the frequency/ number of castings to be tested; d) the manufacturing stage, when liquid penetrant testing is to be performed;
e) the required surface finish of the areas to be tested; f) the type of discontinuity; g) the severity level.The sensitivity can differ depending on the method of liquid penetrant testing selected. Therefore, the severity levels required shall be selected as a function of the liquid penetrants used and the method agreed between the manufacturer and the purchaser. The severity level can vary depending on the area of the casting tested (see Tables 1 and 2).Testing shall be performed by personnel qualified in accordance with ISO 9712 or equivalent recognised standards. The qualification level of the personnel shall be agreed between the manufacturer and purchaser by the time of the acceptance of the order.5.3 Surface preparation The surface to be tested shall be clean and free from oil, grease, moulding and coating residues, or any other contaminant which could interfere with the correct implementation and interpretation of the penetrant testing results. For small indications, it may be necessary to improve the surface condition. Annex A provides guidance on recommended surface finish for testing based on indication allowed.
Surface treatment or cleaning techniques which may seal or close discontinuities are not allowed.BS ISO 4987 pdf downlaod.