ISO 17636-2:2022
Non-destructive testing of welds — Radiographic testing — Part 2: X- and gamma-ray techniques with digital detectors
Non-destructive testing of welds — Radiographic testing — Part 2: X- and gamma-ray techniques with digital detectors
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 64
- Дата публикации:
- 1 сентября 2022 г.
- Издание:
- ISO IS 17636 edition 2 version 1
- ICS:
- 25.160.40
This document specifies techniques of digital radiography with the object of enabling satisfactory and repeatable results. The techniques are based on generally recognized practice and fundamental theory of the subject. This document applies to the digital radiographic testing of fusion welded joints in metallic materials. It applies to the joints of plates and pipes. Besides its conventional meaning, “pipe”, as used in this document, covers other cylindrical bodies such as tubes, penstocks, boiler drums and pressure vessels. This document specifies the requirements for digital radiographic X- and gamma-ray testing by either computed radiography (CR) or radiography with digital detector arrays (DDAs) of the welded joints of metallic plates and tubes for the detection of imperfections. It includes manual and automated inspection with DDAs. Digital detectors provide a digital grey value image which can be viewed and evaluated using a computer (Annex E). This document specifies the recommended procedure for detector selection and radiographic practice. Selection of computer, software, monitor, printer and viewing conditions are important, but are not the main focus of this document. The procedure specified in this document provides the minimum requirements for radiographic practice which permits exposure and acquisition of digital radiographs with equivalent sensitivity for the detection of imperfections as film radiography (specified in ISO 17636-1). This document does not specify acceptance levels for any of the indications found on the digital radiographs. ISO 10675 provides information on acceptance levels for weld inspection. If contracting parties apply lower test criteria, it is possible that the quality achieved will be significantly lower than when this document is strictly applied.
Abstract
Overview
ISO 17636-2:2022 - Non-destructive testing of welds - Radiographic testing - Part 2: X- and gamma-ray techniques with digital detectors - defines recommended procedures and minimum requirements for digital radiography (DR) of fusion welded joints in metallic plates and pipes. It covers both computed radiography (CR) and digital detector arrays (DDAs), including manual and automated DDA inspection, and aims to ensure repeatable, film-equivalent sensitivity for the detection of weld imperfections.
Key topics and technical requirements
- Scope and application: Digital radiographic testing of welded joints in plates, pipes and other cylindrical bodies (tubes, pressure vessels, boiler drums).
- Detector selection and radiographic practice: Guidance for choosing CR or DDA systems, metal screens, and compensation principles (CP I, CP II, CP III).
- Image quality and IQIs: Use and placement of image quality indicators (IQIs), duplex/single wire or step-hole IQIs, and evaluation criteria for digital grey-value images.
- Signal-to-noise ratio (SNR): Minimum normalized SNR requirements for detectors and permitted SNR reductions in defined circumstances (e.g., lower tube voltage or energy-resolving detectors).
- Test arrangements and techniques: Single-wall and double-wall penetration methods (including DWDI/DWSI), geometric magnification, panoramic exposures, alignment, scattering reduction, and source-to-object distance considerations.
- Image acquisition and processing: Scanning/read-out, bad-pixel handling, corrections for DDAs, image processing, monitor viewing conditions and digital storage.
- Reporting and annexes: Required test-report content and informative/ normative annexes covering number of exposures, minimum image quality values, spatial resolution, grey-value considerations and detector unsharpness.
- Limitations: The standard does not set acceptance levels for weld indications - see ISO 10675 for acceptance criteria. It specifies procedures to achieve sensitivity equivalent to film radiography (ISO 17636-1).
Practical applications and users
ISO 17636-2:2022 is intended for professionals and organizations involved in weld inspection and NDT, including:
- Welding inspectors and NDT technicians conducting digital radiographic testing (DR).
- Quality managers and fabrication shops seeking repeatable radiographic procedures for plates, pipes and pressure equipment.
- NDT equipment manufacturers (CR systems, DDAs) and software vendors implementing compliant acquisition and image-processing workflows.
- Owners, contractors and certifying bodies specifying radiography requirements in procurement and conformity assessment.
Related standards
- ISO 17636-1 - Film radiographic techniques (baseline equivalence).
- ISO 10675 - Acceptance levels for weld radiographic indications.
- ISO 19232 series - Image quality and spatial resolution methods.
Keywords: ISO 17636-2:2022, digital radiography, radiographic testing, weld inspection, CR, DDA, X-ray, gamma-ray, NDT.
Технические детали
- Технический комитет
- ISO/TC 44/SC 5 - Testing and inspection of welds
- SKU
- ISO 17636-2:2022
Похожие стандарты
Стандарты, упомянутые в описании