ISO 4992-1:2020 pdf download – Steel castings — Ultrasonic testing — Part 1: Steel castings for general purposes.
3? Terms? and? definitions For the purposes of this document, the terms and definitions given in ISO 5577, ISO 16810, ISO 16811, ISO 16827 and the following, apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https:// www .iso .org/ obp — IEC Electropedia: available at http:// www .electropedia .org/ 3.1 equivalent reference discontinuity echo size indication to be recorded during the assessment phase of an ultrasonic test, usually expressed as an equivalent diameter of a flat-bottomed hole (FBH) 3.2 point-like discontinuity discontinuity, the dimensions of which are smaller than or equal to the sound-beam width Note 1 to entry: Dimensions in this document relate to length, width and/or dimension in the through-wall direction. 3.3 extended discontinuity discontinuity, the dimensions of which are larger than the sound-beam width Note 1 to entry: Dimensions in this document relate to length, width and/or dimension in the through-wall direction. 3.4 planar discontinuity discontinuity having two measurable dimensions 3.5 volumetric discontinuity discontinuity having three measurable dimensions 3.6 rim zone 1/3 the through-wall thickness from the surface with a maximum of 30 mm 3.7 special rim zone outer rim zone (3.6) of the test object with special requirements Note 1 to entry: Examples of special requirements are machined surfaces, higher stresses and sealing surfaces. 3.8 non-measurable dimension dimension of a discontinuity that is smaller than the beam width, which depends on the probe size and the frequency used Note 1 to entry: Current state of the industry is <3 mm.
4 Requirements 4.1 Order information The following information shall be available at the time of enquiry and order (see also ISO 16810): a) the areas of the casting and the number or percentage of castings to which the requirements of ultrasonic testing apply (testing volume, extent of testing); b) the acceptance levels to be applied to the various zones or areas of the casting; c) requirements for a written test procedure; d) whether there are any additional requirements for the test procedure, see also 5.5.1. 4.2 Extent of testing The casting shall be tested so that the agreed areas are covered (insofar as this is possible from the shape of the casting) by the use of the best applicable test technique. For wall thicknesses greater than 600 mm, agreement shall be made between the purchaser and manufacturer on the acceptance levels, test procedure, and the recording of the test results.