Standard Digital Reference Images for Heavy-Walled (2 to 412 in. (50.8 to 114 mm)) Steel Castings

Importancia y uso:

4.1 Personnel utilizing reference radiographs to this standard shall be qualified and authorized to perform radiographic interpretation in accordance with a nationally or internationally recognized NDT personnel qualification practice or standard and certified by the employer or certifying agency, as applicable. The practice or standard used and its applicable revision shall be identified in the contractual agreement between the using parties. For assistance with interpreting specifications and product requirements as applied to the reference radiographs, a certified Level III shall be consulted before accept/reject decisions are made (if the Level III is the radiographic interpreter, this may be the same person).

4.2 Graded reference images are intended to provide a guide enabling recognition of specific casting discontinuity types and relative severity levels that may be encountered during typical fabrication processes. Reference images containing ungraded discontinuities are provided as a guide for recognition of a specific casting discontinuity type where severity levels are not needed. These reference images are intended as a basis from which manufacturers and purchasers may, by mutual agreement, select particular discontinuity classes to serve as standards representing minimum levels of acceptability (see Sections 5 and 6).

4.3 Reference images represented by this standard may be used, as agreed upon in a purchaser supplier agreement, for energy levels, thicknesses, or both, outside the range of this standard when determined applicable for the casting service application. Severity levels of similar discontinuity categories and energy level range of Digital Reference Images E2868 reference images may alternatively be used, as determined appropriate for the casting service application, if so agreed upon in a purchaser supplier agreement.

4.4 Procedures for evaluation of production images using applicable reference images of this standard are prescribed in Section 7; however, there may be manufacturing-purchaser issues involving specific casting service applications where it may be appropriate to modify or alter such requirements. Where such modifications may be appropriate for the casting application, all such changes shall be specifically called-out in the purchaser supplier agreement or contractual document. Section 8 addresses purchaser supplier requisites for where weld repairs may be required.

4.5 Agreement should be reached between cognizant engineering organization and the supplier that the system used by the supplier is capable of detecting and classifying the required discontinuities.

Subcomité:

E07.02

Referida por:

E0689-20, E0186-20

Volúmen:

03.04

Número ICS:

77.140.80 (Iron and steel castings)

Palabras clave:

digital reference image; discontinuities; discontinuity classification criterion; gamma ray; X-ray;