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NB/T 47013.8-2012 related PDF English

NB/T 47013.8-2012 (NB/T47013.8-2012, NBT 47013.8-2012, NBT47013.8-2012) & related versions
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NB/T 47013.8-2012English205 Add to Cart 0-9 seconds. Auto delivery. Nondestructive testing of pressure equipments. Part 8: Leak Testing NB/T 47013.8-2012 Valid NBT 47013.8-2012



NB/T 47013.8-2012: PDF in English (NBT 47013.8-2012)
Contents Scope ... 1 2 Normative References ... 1 3 Terms and Definitions ... 1 4 General Requirements ... 1 5 Testing ...3 6 Result Evaluation ... 4 7 Records and Reports ... 4 Appendix A (Normative) Bubble Leak Testing-Direct Pressurization Technology ... 5 Appendix B (Normative) Bubble Leak Testing-Vacuum Cover Technology ... 8 Appendix-C (Normative) Halogen Diode Leak Testing Technology ... 11 Appendix D (Normative) Helium Mass Spectrometer Leak Testing-Suction Gun Technology ... 16 Appendix E (Normative) Helium Mass Spectrometer Leak Testing-Tracer Probe Technology ... 20 Appendix F (Normative) Helium Mass Spectrometer Leak Testing-Shield Technology ... 24 Appendix G (Normative) Ammonia Leak Testing Technology ... 29 Appendix H (Normative) Sound Wave Testing Technology in Pipe ...33 Appendix I (Normative) Pressure Change Leak Testing Technology ...37 Appendix J (Normative) Thermal Conductivity Technology for Leak Testing ...40 Appendix K (Normative) Ultrasonic Leak Testing Technology ...45 Nondestructive Testing of Pressure Equipment- Part 8. Leak Testing 1 Scope This part ofNB/T 47013 specifies the leak testing method of pressure equipment. This part is applicable to the leak testing of pressure equipment in manufacturing and use to determine the leaking position and measure the leakage rate. The testing methods and technical requirements specified in this part are detailed in Appendixes. 2 Normative References The following 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 Logarithmic Visual Acuity Charts" GB/T 12604.7 "Terminology for Non-destructive Testing-Leak Testing" JB/T4730.l "Nondestructive Testing of Pressure Equipment-Part 1. General Requirements" NBIT 47013.7 "Nondestructive Test of Pressure Equipment-Part 7. Visual Examination" 3 Terms and Definitions For the purposes of this standard, the terms and definitions given in GB/T 12604.7 apply. 4 General Requirements 4.1 General The general requirements of leak testing shall not only in accordance with the relevant requirements of JB/T 4730.1 , but also meet the requirements of Sections 4.2-4.4. 4.2 Testing Personnel The uncorrected or corrected near vision and distance vision of leak testing personnel shall not be less than 5.0 (the decimal record value is 1.0) and the testing method shall meet the requirements of GB 11533. The testing personnel shall receive vision inspection every 12 months to guarantee a normal or correct visual resolution in short distance. 4.3 Process Specification 4.3.1 The process specification of leak testing shall be formulated in accordance with the requirements of JB/T 4 730.1, and shall include the following contents at least. a) Application scope; b) Normative regulations and standards; c) Testing personnel qualification; 4.4.1.5 Calibration The calibration interval of the adopted indication and record pressure gauge/vacuum gauge shall not be greater than 12 months. The accuracy of the results measured by the adopted pressure gauge/vacuum gauge shall meet relevant requirements; where there is any doubt, the pressure gauge shall be recalibrated. Where any pressure gauge/vacuum gauge other than the scale indication or record pressure gauge/vacuum gauge is adopted according to the relevant requirements of this part or normative Appendixes, such pressure gauge/vacuum gauge shall be calibrated according to relevant requirements. 4.4.2 Temperature measuring device Where the temperature measurement is carried out according to the relevant requirements of this part or normative Appendixes, the measuring device shall be calibrated according to relevant requirements. 4.4.3 Standard leak hole a) P~netration standard leak hole. the penetration leak hole made of melt and calibrated glass or quartz and provided with helium leakage rate as 1x10-7 (Pa · m3)/s~ 1x10-11 (Pa · m3)/s. b) Capillary standard leak hole. the calibrated capillary leak hole running through the pipe with the required leak rate equals to or smaller than the product of the required testing sensitivity and the actual tracer gas percentage concentration. 5 Testing 5.1 Testing Equipment 5.1.1 Surface preparation The surface of the tested piece shall be free from oil liquid, grease, paint and other potential contaminants which may impede the testing. If liquid is adopted to clean the workpiece or carry out pressure test before leak testing, the tested piece shall be fully dried before testing. 5.1.2 Sealing Plug, cover plate, sealing wax, adhesive or other suitable materials easy to be fully removed shall be used to seal all holes; the sealing materials shall not affect the tracer gas concentration during the testing. 5.1.3 Testing temperature The minimum temperature of the tested piece during testing shall meet the requirements of Appendixes and relevant test (like the pressure test) of the tested piece. During the testing, the maximum temperature shall not be greater than the permissible temperature determined by the adopted leak testing method or technical requirements. 5.1.4 Pressure/~acuum (pressure limit) Unless otherwise specified in the Appendixes or relevant requirements of this part, the pressure leak testing shall be carried out for workpiece, and the testing pressure shall not be greater than 1.15 times of the design pressure. 5.2 Pre-leak Testing A.1 General Appendix A (Normative) Bubble Leak Testing - Direct Pressurization Technology Bubble leak testing-direct pressurization technology. a pressurization method to directly apply gas (testing solution) inside (outside) the tested piece or put the tested piece directly into the solution. As the leak gas will cause bubbles while passing through the liquid, it can be determined whether there is any leak and the position of leak hole (if any). A.2 Scope This testing method is a rough leak testing method provided with low testing sensitivity. Generally, it is only used for determining whether there is any leak instead of a quantitative testing. However, under some circumstances, it is also used as a quantitative testing. A.3 General Requirements A.3.1 General The general requirements of this testing method shall not only comply with JB/T 4730.1, but also meet the requirements of Articles A.3.2~A.3.5. A.3.2 Process specification A.3.2.1 As for the important factors, the following contents shall be included. a) Foaming solution (designation or model); b) Surface temperature (during the testing, the minimum temperature of the tested piece shall not be less than the relevant requirements of pressure test and the maximum or minimum temperature shall be consistent with the testing method); c) Surface condition; d) Lighting condition; e) Technique requirements of personnel (if necessary). A.3.2.2 As for the general factors, the following contents shall be included. a) Pressurizing gas; b) Pressurizing equipment; c) Pressure gauge; .., d) Presson.. holding time; e) Testing pressure; f) Post cleaning method; g) Acceptance standard; h) Personnel qualification. Appendix B (Normative) Bubble Leak Testing-Vacuum Cover Technology B.1 General Bubble leak testing-vacuum cover technology. a leak testing technology applicable to pressure components which cannot be directly pressurized. The foaming solution is applied to part of the enclosure of pressure piece, then the vacuum cover is used to form a certain pressure difference on both sides of such area. In case of any leak, bubbles will be generated on the side with lower pressure; thus the leak position may be determined. B.2 Scope This testing method is a rough leak testing method provided with low testing sensitivity. Generally, it is only used for determining whether there is any leak instead of a quantitative testing. B.3 Gen.eral Requirements B.3.1 General The general requirements of leak testing shall not only in accordance with the relevant requirements of JB/T 4730.1 and this part, but also meet the requirements of Articles B.3.2~B.3.5. R3.2 Process specification B.3.2.1 As for the important factors, the following contents shall be included. a) Foaming solution (designation or model); b) Surface temperature( during the testing, the minimum temperature of the tested piece shall not be less than the relevant requirements of pressure test and the maximum or minimum temperature shall be consistent with the testing method); c) Surface condition; d) Lighting condition; e) Technique requirements of personnel (if necessary). B.3.2.2 As for the general factors, the following contents shall be included. a) Vacuum source; b) Vacuum cover (dimension and shape); c) Vacuum holding time; d) Vacuum testing pressure; e) Pressure gauge; t) Post cleaning method; g) Acceptance standard; h) Personnel qualification. C.1 General Appendix C (Normative) Halogen Diode Leak Testing Technology Halogen diode leak testing technology. a method to adopt halogen diode detection technology for leak testing. The advanced electronic halogen leak detector is provided with high sensiti... ......

BASIC DATA
Standard ID NB/T 47013.8-2012 (NB/T47013.8-2012)
Description (Translated English) Nondestructive testing of pressure equipments. Part 8: Leak Testing [Quasi-Official / Academic version - scanned PDF, translated by Standard Committee / Research Institute in China]
Sector / Industry Energy Industry Standard (Recommended)
Classification of Chinese Standard H26
Classification of International Standard 77.040.20
Word Count Estimation 44,481
Quoted Standard GB 11533; GB/T 12604.7; JB/T 4730.1; NB/T 47013.7
Drafting Organization China Special Equipment Inspection and Research Institute
Administrative Organization National Standardization Technical Committee Boiler and Pressure Vessel
Regulation (derived from) National Energy Board Announcement No. 1, 2012
Summary This standard specifies the method of pressure leak detection equipment. This section applies to the system and the pressure with a leak detection equipment that can be used to determine the leak site and measuring the leakage rate. This section provides