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 9: Acoustic Emission Testing;
— Part 10: Ultasonic 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 12: "Magnetic Flux Leakage Testing" of NB/T 47013.
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1 Scope
1.1 This Part of NB/T 47013 specifies test methods and evaluation criteria for uniform wall thickness reduction caused by corrosion, erosion or mechanical damage on ferromagnetic materials (carbon steel, low alloy steel, etc.) of pressure equipment in use, all tests shall be carried out without dismantle cover layer.
1.2 This Part is applicable to the testing of wall thickness reduction of main body base materials of pressure equipments accompanied with cover layers, which, have the following conditions:
a) Metal coating thickness not greater than 1mm;
b) For stainless steel or aluminum protective layer, cover thickness not greater than 200mm; for ferrum protective layer, cover thickness not greater than 100mm;
c) Base material thickness range is 3mm to 7mm;
d) Tube or tube fittings with diameter not less than 50mm;
e) Base material temperature range is -196℃ to 500℃.
1.3 Testing of pressure equipment in use without cover layer may refer to this Part.
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/T 12604.6 Non-destructive testing — Terminology — Terms used in eddy current testing
GB/T 28705-2012 Non-destructive testing — Test method for pulsed eddy current testing
NB/T 47013.1 Nondestructive Testing of Pressure Equipments — Part 1: General Requirements
NB/T 47013.3 Nondestructive Testing of Pressure Equipments — Part 3: Ultrasonic Testing
3 Terms and Definitions
For the purpose of this document, terms and definitions given in NB/T 47013.1, GB/T 28705, GB/T 12604.6 and the following apply.
3.1
Pulsed eddy current
The phenomenon of eddy current induced within steel body, base on the excitation of pulse magnetic field.
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 General Requirements
5 Magnetic Flux Leakage Testing of Steel Tube Components in Manufacturing
6 Magnetic Flux Leakage Testing for the Pressure Equipments In-service
7 Magnetic Flux Leakage In-line Testing of Pressure Pipeline In-service
8 Detection Record and Report
Appendix A (Normative) Magnetic Flux Leakage External Testing for the Pressure Equipments In-service
Appendix B (Normative) Reference Specimen for Magnetic Flux Leakage In-line Testing of Pressure Pipeline In-service
