This standard specifies the dimensional and geometric accuracy test methods for clamping and flaring pipe joints. This standard is used in conjunction with the corresponding product and technical condition standards. This standard is applicable to pipe joint products produced according to national standards, and can also be used as a reference for pipe joint products produced according to other standards or non-standard products. JB/T 5993-1992 Pipe joint test method JB/T5993-1992 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T5993-1992
Pipe Fittings
Testing Methods
Published on July 17, 1992
Implementation of the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 1, 1993
Mechanical Industry Standard of the People's Republic of China
Pipe Fittings
1 Subject Content and Scope of Application
Testing Methods
JB/T5993-1992
This standard specifies the testing methods for the dimensions and geometric accuracy of ferrule and flared pipe fittings. This standard is used in conjunction with the corresponding product and technical condition standards.
This standard applies to pipe fittings produced in accordance with national standards, and pipe fittings produced in accordance with other standards or non-standard standards can also be used as a reference. 2
Cited standards
GB1214
GB1216
GB1581
GB1957
GB3934
GB 6315
GB8177
ZB J42 037
Vernier caliper
Outside micrometer
Metric taper thread gauge
Smooth limit gauge
Ordinary thread gauge
Universal angle ruler
Inside micrometer
Pipe thread gauge for thread sealing
3 Inspection items, methods and inspection tools
The inspection of threaded part shall be in accordance with the provisions of Table 1.
Approved by the Ministry of Machinery and Electronics Industry on July 17, 1992 and implemented on July 1, 1993
Test items
Internal thread middle diameter and major diameter
Internal thread single middle diameter
Internal thread minor diameter
External thread middle diameter and minor diameter
External thread single middle diameterwwW.bzxz.Net
External thread major diameter
Comprehensive inspection of metric tapered threads
Pipes sealed with threads
Comprehensive inspection of threads
JB/T5993-1992
Testing method
Tighten the through-end thread by hand When the plug gauge is screwed into the workpiece, it should be able to be smoothly screwed until it is screwed into all the effective threads of the workpiece. Screw the end-stop thread plug gauge into the workpiece by hand, and the screwing depth shall not exceed 2 times the pitch. Method 1: GB3934 specifies the through-end thread plug gauge. GB3934 specifies the end-stop thread plug gauge. Insert the through-end smooth plug gauge into the workpiece by hand, and it should be able to smoothly insert it to the effective thread depth of the workpiece. Insert the end-stop smooth plug gauge into the workpiece, and the insertion depth shall not exceed 2 times the pitch. Method 2: Use a dry ruler to measure on two diameters 90° apart, and neither shall exceed the tolerance. |tt||Screw the through-end thread ring gauge into the workpiece by hand, and it should be able to smoothly engage with all the effective threads of the workpiece
Screw the stop-end thread ring gauge into the workpiece by hand, and the screwing depth shall not exceed 2 times the pitch
Method 1:
Inner diameter specified in GB8177
Micrometer
Through-end specified in GB3934
Thread ring gauge
Stop-end specified in GB3934
Thread ring gauge
Slip the through-end smooth ring gauge into the workpiece by hand, and it should be able to smoothly reach the effective thread length of the workpiece as specified in Appendix A of GB3934; Insert the smooth ring gauge of the stop-end smooth ring into the workpiece, and the insertion depth shall not exceed 2 times pitch method 2:
Measure with a dry ruler on two diameters 90° apart and neither shall exceed the tolerance
Screw the metric taper thread gauge into the workpiece by hand, and the end face of the workpiece should be between the two limit end faces of the gauge
Screw the taper pipe thread gauge into the workpiece by hand, and the end face of the workpiece should be between the two limit end faces of the gauge
Outer diameter specified in GB1216
Micrometer
Cone thread gauge specified in GB1581
Cone
Pipe thread gauge specified in ZBJ42037
JB/T5993-1992
3.2 The inspection of other dimensions and geometric accuracy shall be in accordance with the provisions of Table 2. Table 2
Test items
End pipe joint screw-in end
Verticality of the bearing surface to the screw-in end thread axis
Nut and joint wrench
Partial width across flats
Angle α of the pipe joint body
Dimension d of the ferrule type pipe joint body
Coaxiality of the d axis of the joint body to the d axis
Outer diameter D of the ferrule small end,
Function diameter
See Appendix A
Test method
Method 1:
Measure across the opposite side with a 0.02mm vernier caliper
Method 2:
Measure with a special through and stop gauge
Method 1:
Use a universal angle ruler
Method 2:||t t||Use a special angle template
Method 1:
Measure with a 0.02mm vernier caliper, measure at least two points 90° apart, and both points must not exceed the tolerance
Method 2:
Measure with a smooth limit gauge
Method 1:
Measure the wall thickness at both ends of the same diameter with a 0.02mm vernier caliper, and calculate the difference between the two thicknesses
Method 2:
See Appendix A
Measure across the diameter with an outside diameter dry ruler
Method 1:
Measure with a 0.02mm vernier caliper
Method 2:
Measure with a smooth limit plug gauge
Method 1:
The caliper specified in GB1214
Method 2:
The caliper should comply with GB1957| |tt||Universal
angle ruler specified in GB6315
Method 1:
Caliper specified in GB1214
Method 2:
Smooth
Caliper specified in GB1957
Indirect measurement, measure at least on two diameters
90° between phases
At least on two diameters
90° between phases
Outer diameter 9
specified in GB1216
Measure on a micrometer
and take the average
Method 1:
Vernier specified in GB1214
Method 2:
Smooth
Limit gauge specified in GB1957
At least on two diameters
between phases
|tt||Measure on two diameters of 90° and take the average
JB/T5993-1992
Appendix A
Verticality and coaxiality detection method
(reference)
Verticality detection method of the support surface of the screw-in end of the end pipe joint to the axis of the screw-in end thread. Manually screw the threaded through end ring gauge on the screw-in end thread of the joint body, and measure the maximum difference between the joint body support surface and the ring gauge end face clearance 1 (see Figure A1)
A2 Measurement of the coaxiality of the d axis of the joint body to the d, axis. Screw the special nut onto the joint body, and then insert the special mandrel through the hole of the nut into the d hole of the joint body. It should be able to be inserted smoothly (see Figure A2)
Additional notes:
This standard is proposed and managed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Mechanical Standardization Institute of the Ministry of Machinery and Electronics Industry, the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry, Zhejiang Haiyan Pipe Fittings Factory and Zhou Hydraulic Accessories Factory.
People's Republic of China
Mechanical Industry Standard
Test Method for Pipe Joints
JB/T 5993 - 1992
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Sheet 1/2
Word Count 8.000
First Edition in October 1992
First Printing in October 1992
Print Quantity 1-500
Price 1.60 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn2661 - 66 /
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