In the pressure pipeline, pup joints are usually required between the tee and the elbow to ensure the safety and reliability of the pipeline.

What is a pressure pipeline pup joint?
A pressure pipeline pup joint is a pipeline component installed at the connection of a tee or elbow, usually consisting of two short pipes and a support ring. The function of the pup joint is to withstand the bending stress in the pipeline through the support ring, thereby alleviating the stress concentration of the pipeline and reducing the risk of pipeline deformation and rupture.

Why is it necessary to add a pup joint between the tee or elbow?
In the pressure pipeline, bending stress will be generated due to the deadweight of the pipeline and the flow of the medium, and the connection points such as tees and elbows are the parts where stress is concentrated in the pipeline. At the same time, due to the deadweight of the pipeline, these parts will also have certain extrusion stress. These stress-concentrated parts are prone to serious deformation and rupture accidents of the pipeline, so it is necessary to reduce the stress concentration of the pipeline by installing pup joints and other measures, thereby improving the reliability and safety of the pipeline.

Installation method and precautions of pup joints
In pressure pipelines, the installation method of pup joints can be adjusted according to the specific conditions of the pipeline. It is usually necessary to select pup joints that meet specifications and standards, and ensure the quality of the pup joint materials and the tightness of the pipeline. At the same time, during installation, it is necessary to pay attention to the assembly accuracy and tightening torque of the pup joint and the pipeline support ring, as well as to check the sealing of the connection to ensure the reliability of the installation of the pup joint.

Summary
In summary, in order to ensure the safety and reliability of pressure pipelines, pup joints need to be installed between the tee and the elbow to reduce stress concentration and reduce the risk of deformation and rupture. When installing the pup joint, it is necessary to pay attention to issues such as material quality, reinforcement method, tightening torque and sealing inspection to ensure the safety and reliability of the pipeline.