NB/T 47013 consists of the following fourteen parts under the general title Nondestructive testing of pressure equipment:
——Part 1: General requirements;
——Part 2: Radiographic testing;
——Part 3: Ultrasonic testing;
——Part 4: Magnetic particle testing;
——Part 5: Penetrant testing;
——Part 6: Eddy current testing;
——Part 7: Visual examination;
——Part 8: Leak testing;
——Part 9: Acoustic emission testing;
——Part 10: Ultrasonic time of flight diffraction technique;
——Part 11: Standard practice for X-ray digital radiography;
——Part 12: Magnetic flux leakage testing;
——Part 13: Pulsed eddy current testing;
——Part 14: X-ray computed radiographic testing.
This is Part 14 X-ray computed radiographic testing of NB/T 47013.
Nondestructive testing of pressure equipment - Part 14: X-ray computed radiographic testing
1 Scope
1.1 This part of NB/T 47013 specifies the technical and quality classification requirements for fusion welded joints of metal pressure parts of pressure equipment subjected to 450kV and below X-ray computed radiographic testing (hereinafter referred to as CR testing).
1.2 This part is applicable to CR testing of fusion welded joints of steel, copper and copper alloy, aluminum and aluminum alloy, titanium and titanium alloy, nickel and nickel alloy materials. The type of welded joint is butt weld of butt joint of plate or pipe (hereinafter referred to as "butt weld").
1.3 This part may also serve as a reference for CR testing on welded joint of other materials, supporting members and structural members of the pressure equipment.
2 Normative references
The following referenced documents are indispensable for the application 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.
GB 11533 Standard for logarithmic visual acuity charts
GB/T 12604.2 Non-destructive testing - Terminology - Terms used in radiographic testing
GB 18871 Basic standards for protection against ionizing radiation and for the safety of radiation sources
GB/T 21356 Non-destructive testing - Qualification and long-term stability of computed radiology systems
GB/T 23901.5 Non-destructive testing - Image quality of radiographs - Part 5: Image quality indicators (duplex wire type) - Determination of image unsharpness value
GBZ 117 Radiological protection standards for industrial X-ray detection
JB/T 5075 Non-destructive testing - Metal intensifying screens for radiographic testing
JB/T 7902 Non-destructive testing - Image quality indicators (wire type) for radiographic testing
NB/T 47013.1 Nondestructive testing of pressure equipment - Part 1: General requirements
NB/T 47013.2-2015 Nondestructive testing of pressure equipment - Part 2: Radiographic testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 12604.2, NB/T 47013.1 and NB/T 47013.2 and the following apply.
3.1
imaging plate, IP
flexible board coated with photo-excited phosphorescent crystal and capable of storing information in the form of latent image after exposure and replacing film for radiography testing
3.2
X-ray computed radiography system, CRS
system consisting of IP, special laser scanner, computer hardware and special software, etc. and capable of converting the information on IP into digital images, which is referred to as "CR system"
3.3
object-to-IP distance, b
distance between the surface of the tested object (at the side of the radiation source) and the IP measured in the direction of the radiation beam
3.4
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Testing process and its selection
6 Testing result evaluation and quality grading
7 Testing record and report
Annex A (Informative) Testing method for the minimum grey value
Annex B (Normative) Determination of spatial resolution
Annex C (Normative) Determination of normalized signal-to-noise ratio
