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GB/T 37929-2019 PDF in English


GB/T 37929-2019 (GB/T37929-2019, GBT 37929-2019, GBT37929-2019)
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GB/T 37929-2019: PDF in English (GBT 37929-2019)

GB/T 37929-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.100
N 78
Non-destructive Testing Instruments - Testing
Methods for Life of X-ray Tubes
ISSUED ON: AUGUST 30, 2019
IMPLEMENTED ON: MARCH 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 4 
4 Test Requirements ... 4 
5 Test Methods ... 5 
Non-destructive Testing Instruments - Testing
Methods for Life of X-ray Tubes
1 Scope
This Standard stipulates testing methods for life of X-ray tubes.
This Standard is applicable to the detection and analysis of industrial X-ray tubes.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 26594-2011 Non-destructive Testing Instruments - Properties Test Methods of
Industrial X-ray Tube
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Life of X-ray Tubes
Test the life of X-ray tubes under the rated tube voltage, rated tube current and
stipulated distance and orientation. Analytical instrument uses the spectral purity of X-
ray tubes, namely, the impurity line, as the assessment parameter of the life of X-ray
tubes. The assessment parameter of the life of other industrial X-ray tubes is the dose
rate. When dose rate is less than 90%, it signifies the end of life.
4 Test Requirements
4.1 Test Conditions
Test conditions shall comply with the requirements in Chapter 4 in GB/T 26594-2011.
4.2 Load Power
Load power shall be not lower than the rated power.
4.3 Qualification Requirements
tK---measurement time when it is found that the assessment parameter of life no longer
complies with the stipulation in the detailed specification, expressed in (h);
tK-1---the previous measurement time when it is found that the assessment parameter
of life no longer complies with the stipulation in the detailed specification, expressed in
(h).
At this moment, when the dose rate of X-ray tube is lower than 90%, the X-ray tube
shall be determined as unqualified.
c) During the process of life test, if it is found on the testing instrument that X-ray
tube is obviously invalid (for example, air leakage, or, rupture), then, ti shall be
the time from the beginning of the test to the moment when such invalidation is
found.
5.2 Method of Single Load Times
5.2.1 Use single load times N of X-ray tube to express the life of X-ray tube. N shall be
stipulated in the detailed specification.
5.2.2 Single load power shall be not less than 90% of the maximum power under the
stipulated load time. Repeated loads in a certain interval of time are allowed. The
anode storage heat when each load begins and the interval time between two adjacent
repeated loads shall be stipulated in the detailed specification.
5.2.3 Test procedure shall comply with the following steps:
a) In accordance with the stipulated load conditions, make the anode storage heat
reach the value stipulated in the detailed specification;
b) In accordance with the single load conditions and interval time stipulated in the
detailed specification, conduct repeated loads;
c) Comply with the assessment parameter of life stipulated in the detailed
specification, however, after 0, (10.1 n) N, 0.9 N and N load, the measurement
shall also be conducted.
5.2.4 Life test shall adopt average life for determination. When the average life rate A
is not less than 90%, then, the X-ray tube is qualified in the life test. Average life rate
A shall be calculated in accordance with Formula (3):
Where,
n---quantity of tubes being tested;
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.