NB/T 47013.8-2012 PDF in English
NB/T 47013.8-2012 (NB/T47013.8-2012, NBT 47013.8-2012, NBT47013.8-2012)
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| NB/T 47013.8-2012 | English | 205 |
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Nondestructive testing of pressure equipments. Part 8: Leak Testing
| Valid |
Standards related to (historical): NB/T 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...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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