3 Major Types of Stainless Steel Pup Joints

Stainless steel pup joints are a type of fittings commonly used in pipeline connections. They are mostly connected by welding or threading. There are many types of stainless steel pup joints to choose from. They have a simple structure and small size. They can be easily installed in various pipelines and equipment. They also have good sealing performance and can effectively prevent fluid leakage. In pipeline systems, stainless steel pup joints are often used in conjunction with a variety of pipes and accessories, such as seamless steel pipe, pipe flange, valve, etc., which can further improve the overall performance of the pipeline system. Stainless steel pup joints can meet the needs of different pipeline designs. Common types of stainless steel pup joints include threaded pup joints, reducing pup joints (reducing pipes), and hexagonal pup joints.

Threaded pup joints

Threaded pup joints are an important type of stainless steel pup joints, mainly divided into single-end threaded pup joints and double-end threaded pup joints. One end of a single-end threaded pup joint is an external thread, and the other end is a flat or beveled end; while both ends of a double-end threaded pup joint are external threads.

Threaded pup joints have significant advantages in pipeline systems, easy installation and disassembly, a variety of specifications, and can withstand higher pressures. It is suitable for various high-pressure fluid pipelines and equipment, can meet the needs of different pipelines and equipment, and has high cost performance.

From the appearance, the threaded pup joint has a smooth surface, no defects such as cracks, pores and inclusions, and is durable. Its production standard is ASTM A733.

Reducing pup joint (reducing tube)

Reducing pup joint, also known as reducing tube, is a pup joint used to connect pipes of different diameters, divided into concentric and eccentric types.

Its connection forms include butt welding and threaded connection, which can effectively adjust the pipe diameter, reduce pressure loss and flow resistance in the pipeline system, and avoid water leakage and seepage.

Reducing pup joint is simple in design, easy to install and maintain, can save a lot of time and labor costs, and is one of the most widely used stainless steel pup joint. Its corresponding production standards include American standard MSS SP-95 and petrochemical standard SH/T 3419.

Hexagonal pup joint

Hexagonal pup joint is a special stainless steel pup joint, commonly seen in equal diameter and reducing diameter forms.

Its hexagonal structure gives it high strength and torsion resistance, and the external thread design ensures the tightness and stability of the connection with the pipeline or equipment, effectively preventing fluid or gas leakage.

The hexagonal pup joint is made of stainless steel, has good corrosion resistance and wear resistance, can maintain performance in a variety of harsh environments, and is widely used in industrial pipelines and precision instruments. Its production standards include GB/T 14383, ASME 16.11 and BS 3799.

Summary

When choosing a stainless steel pup joint, it is necessary to choose the appropriate type based on the specific use environment, corrosion resistance requirements and processing technology.