There are two combinations between external and internal threads used in threaded pipe joints. External threads on pipe wall are always taper threads but internal threads on fitting are taper threads or parallel threads. This paper deals with the mechanical and leakage behavior of pipe-socket threaded joints which have the thread type combination of taper-taper threads or taper-parallel threads. Deformation and stress distribution in the engaged threads of the joint subjected to the bending moment as well as internal pressure are simulated by means of finite element analysis and the differences due to the thread type combination are clarified for 3/4" and 3" joints. Simulated load distribution on the engaged threads in the taper-taper threads joints shows more uniform than that in the taper-parallel threads joints, and thus the taper-taper threads joints have higher load capacity than the taper-parallel threads joints. This suggests that the taper-taper threads pipe-socket joints have better mechanical integrity and higher sealing performance as well. Experimental bending tests are also carried out to examine the leakage behavior of the joints under the pressurized condition. It has been demonstrated that the leak tightness in the taper-taper joints is much better than that in the taper-parallel joints. Those test results have validated the finite element simulation.


Fem Stress Analysis and Leakage Behavior of Pipe-Socket Threaded Joints Subjected to Bending Moment and Internal Pressure

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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