This standard specifies the test specimens, measuring tools, measuring methods and inspection reports required for the measurement of ceramic pipe dimensions and deviations. This standard applies to the measurement of ceramic pipe dimensions and deviations. GB/T 2837-1998 Ceramic pipe dimensions and deviation measurement methods GB/T2837-1998 Standard download decompression password: www.bzxz.net

GB/T2837—1998
This standard is revised on the basis of the original GB/T2837—1981 with reference to Appendix A “Straightness Test” of British Standard BS65—1991 “Sintered Ceramic Tubes, Fittings and Joints” and the straightness test method and end face verticality test method in Australian Standard AS1741--1991 “Sintered Ceramic Tubes”. The technical indicators of the original GB/T2837—1981 are retained, and the format and text of the standard are modified. This standard will replace GB/T2837—1981 from the date of its promulgation and implementation. 981. This standard was proposed by the State Building Materials Industry Bureau. This standard is under the jurisdiction of the National Industrial Ceramics Standardization Technical Committee. This standard was drafted by the Shandong Industrial Ceramics Research and Design Institute of the State Building Materials Industry Bureau. The main drafters of this standard are: Li Dongsheng, Wang Xian, Lu Fenghua, Ma Yan. This standard was entrusted to the Shandong Industrial Ceramics Research and Design Institute of the State Building Materials Industry Bureau for interpretation. This standard was first issued in 1981.
1 Scope
National Standard of the People's Republic of China
Measuring method for size and deviation of vitrified clay pipe
Measuring method for size and deviation of vitrified clay pipeGB/T 2837—1998
Replaces GB/T2837—1981
This standard specifies the specimens, measuring tools, measuring methods and inspection reports required for measuring the dimensions and deviations of ceramic pipes. This standard applies to the measurement of dimensions and deviations of ceramic pipes. 2 Specimens
The specimen is a whole ceramic pipe.
3 Measuring tools
3.1 Metal ruler or tape measure with an accuracy of 1mm. 3.2 Right-angle ruler.
3.3 Inner and outer circle clamps.
3.4 ​​Measuring rod: The length is the nominal length of the measured ceramic pipe minus 150mm, the cross-section is 3×30mm, at least one side should be processed and the surface should be straight.
4 Measuring method
4.1 Method for measuring the inner diameter of the pipe: 50mm in front of the bottom plane of the socket inside the pipe cylinder (if it is a straight pipe, it is 50mm from the end face of the pipe cylinder) mm), use an internal card to measure twice in the same plane in perpendicular directions, and take the average value. 4.2 Pipe wall thickness measurement method: Use an external card to measure the maximum and minimum values ​​of the pipe wall thickness 50mm outside the end face of the socket, and take the average value. 4.3 Ceramic pipe effective length measurement method: Use a steel tape measure to measure twice on the opposite sides of the pipe wall inside the pipe tube, and take the average value. The effective length of a straight pipe is the distance between the two end faces of the pipe body; the effective length of a socket-type pipe mouth is the distance between the bottom plane of the socket and the end face of the socket. www.bzxz.net
4.4 Socket inner diameter and wall thickness measurement method: Use an internal card to measure the inner diameter twice in perpendicular directions at 1/2 depth of the socket, and take the average value. When measuring the socket wall thickness with an external card at the same position, it shall not be measured in the groove on its inner wall. 4.5 Socket depth measurement method: Use a metal ruler with a length greater than the outer diameter of the socket and close to the end face of the socket, and measure the distance between the bottom plane of the socket and the ruler, which is the socket depth. Two locations should be measured and the average value should be taken. 4.6 Method for measuring the ovality of the socket and the spigot: Use an inner card to measure the maximum inner diameter of the socket and the inner diameter in the vertical direction on the same plane at 1/2 of the depth of the socket. The difference between the two is the measured value of the ovality of the socket. Use an outer card to measure the maximum outer diameter of the spigot and the outer diameter in the vertical direction on the same plane at the end face of the spigot. The difference between the two is the measured value of the ovality of the spigot.
Both of the above measurements must avoid the grooves that are scratched. 4.7 Method for measuring the curvature of ceramic pipes: Place the two ends of the measuring rod close to the outer wall of the ceramic pipe, and the distance between the two ends and the end face of the ceramic pipe or the inclined surface of the socket connection should be equal. Rotate the measuring rod along the outer wall of the pipe body and use a ruler to measure the maximum distance between the outer wall of the ceramic pipe and the measuring rod. This is the measured value of the curvature of the ceramic pipe. Approved by the State Administration of Quality and Technical Supervision on October 12, 1998 and implemented on April 1, 1999.
As shown in Figure 1.
GB/T 2837—1998
Figure 1 Method for measuring the curvature of ceramic pipes
4.8 Method for measuring the end face slope: The measurement is carried out with a right-angle ruler. The length of one arm of the ruler must be greater than the outer diameter of the ceramic pipe, and the length of the other arm should be slightly shorter than the distance from the end face of the socket to the inclined surface of the socket connection. When measuring, one arm of the ruler stands tightly on the end face of the ceramic pipe socket, and the other arm must be close to the outer wall of the pipe body. It should have at least two contact points with the pipe wall. Rotate the ruler along the outer wall of the ceramic pipe. The maximum gap S between the end face of the ceramic pipe and the ruler is the end face slope of the ceramic pipe, as shown in Figure 2. S
Figure 2 Ceramic pipe end face inclination measurement method
5 Inspection report
The inspection report should include the following contents:
a) sample name and number;
b) number according to standard;
c) various measurement results;
d) measurement date and measurement personnel.
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