NB/T 47013.2-2015 in English

This Standard "Nondestructive Testing of Pressure Equipments" (NB/T 47013) comprises the following 13 parts:
- 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 Testing;
- Part 8: Leak Testing;
- Part 4: Acoustic Emission Testing;
- Part 10: Ultrasonic Time of Flight Diffraction Technique;
- Part 11: X-ray Digital Radioscopic Testing;
- Part 12: Magnetic Flux Leakage Testing;
- Part 13: Pulsed Eddy Current Testing.
This Part is Part 2 of NB/T 47013 (Radiographic Testing).
... ...
... ...
1 Scope

1.1 This Part of NB/T 47013 specifies X ray and γ ray testing technology and quality classification requirements for metal fusion welded joints in pressure equipments.
1.2 The metals of metal fusion welded joint applicable in this Part include steel, copper and copper alloys, aluminum and aluminum alloy, titanium and titanium alloy, nickel and nickel alloy. The types of welded joint include plate and tube butt joint butt weld (hereinafter referred to as "butt weld"), inserted and placement connection tube fillet joint butt weld (hereinafter referred to as "tube socket fillet weld" and tube-tube plate fillet weld (with reference to Appendix A).
1.3 Radiographic testing for welded joint of other metallic materials, supporting members and structural members of pressure equipments may also refer to this Part.

2 Normative References

The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document.
GB 11533 Standard 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 19348.1 Non-destructive Testing--Industrial Radiographic Films - Part 1: Classification of Film Systems for Industrial Radiography
GB/T 19348.2 Non-Destructive Testing - Industrial Radiographic Films - Part 2: Control of Film Processing by Means of Reference Values
GB/T 19802 Non-destructive Testing - Industrial Radiographic Illuminators - Minimum Requirements
GB/T 23901.2 Non-destructive Testing - Image Quality of Radiographs - Part 2: Image Quality Indicators (Step/Hole Type) - Determination of Image Quality Value
GBZ 117 Radiological Protection Standards for Industrial X-ray Detection
GBZ 132 Radiological Protection Standards for Industrial γ-ray Inspection
NB/T 47013.1 Nondestructive Testing of Pressure Equipments - Part 1: General Requirements
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

3 Terms and Definitions

For purpose of this Part, the terms and definitions specified in GB/T 12604.2 and NB/T 47013.1 as well as those listed below apply.
3.1
W penetrated thickness The nominal thickness of materials in the direction of radiography exposure. In multilayer radiography, W penetrated thickness is the sum of nominal thickness of penetrated layers of materials.
3.2
b object-to-film distance
The distance between the surface at the source side of tested part of the object measured along the center of radiography beam and the film.
3.3
f Source-to-object distance
The distance between the source measured along radiography beam center and the surface at the source side of tested part of the object.
3.4
F Focal distance
The distance between the source measured along radiography beam center and the film.
3.5
d Source size
Effective focal point size of source.
3.6
Round flaw

Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 General Requirements
5 Testing Process and Its Selection
6 Result Evaluation and Quality Classification of Radiographic Testing for Fusion Welded Joint in Pressure Equipment
8 Testing Records and Reports
Appendix. A (Informative)
Appednix B (Normative) Characteristic Indexes of Industrial Radiographic Film System
Appendix C (Informative) Regular Checking Method for Nigrometer (Optical Densitometer)
Appendix D (Informative) Determination of Safe Radiographic Time in Dark Room
Appendix E (Informative) Schematic Diagram of Typical Radiographic Method
Appendix F (Informative) Determination Method for Radiography Times of Circumferential Butt Weld
Appendix G (Normative) Calculation Method for Focus Size
Appendix I (Informative) Filter Plate
Appendix J (Normative) Placement Principle of Location Mark
Appendix K (Informative) Measurement Method for Thiosulfate Ion Concentration on Film
Appendix L (Normative) Type and Specification of Reference Block