Pup Joints Length Standard

Pup joints are important components in pipeline connection, used to connect two sections of pipelines of different sizes or types. According to the national standard GB/T12771-2008 "Technical Specifications for Stainless Steel Welded Pipelines", the length of pup joints should meet the following standards:

(1) The length of pup joints of DN15~DN100 is 150mm.

(2) The length of pup joints of DN125~DN200 is 200mm.

(3) The length of pup joints of DN250~DN400 is 250mm.

(4) The length of pup joints of DN450 and above is 300mm.

The above length standards apply to pup joints made of different materials, including stainless steel, carbon steel, cast iron, etc.

The impact of length standards on pipeline connection

Pup joints are important components in pipeline connection, and their length standards directly affect the quality and safety of pipeline connection. Too long a pup joint is likely to cause deformation of the pipe, leading to leakage and damage at the pipe joint; too short a pup joint is likely to cause stress concentration at the pipe joint, which will also affect the safety of the pipe connection.

Therefore, when connecting pipes, it is very important to select a pup joint length that meets the standards. In addition, attention should also be paid to factors such as the material and manufacturing process of the pup joint to ensure the quality and safety of the pipe connection.

Summary

Only by selecting a pup joint length that meets the standards can the quality and safety of the pipe connection be guaranteed. When connecting pipes, attention should also be paid to factors such as the material and manufacturing process of the pup joint to avoid leakage and damage at the pipe joint.