What is a union?

A union, also known as a union joint, is a component used for removable connections between pipes. It typically consists of three parts: a male end, a female end, and a gasket. The male and female ends are connected to the two pipes to be joined, achieving a tight seal through threaded connections, while the gasket serves as a seal to prevent leakage of the medium inside the pipes.

Compared to traditional welding or flange connections, the most significant feature of union is their removability. This feature makes pipeline installation, maintenance, and replacement more convenient, eliminating the need for destructive operations on the pipeline, significantly improving work efficiency, and reducing maintenance costs.

MSS SP-83 Pipe Union Specification

ZIZI offered range of MSS SP-83 Union Pipe Fittings is intended and developed in accordance with the international quality standards at our infrastructure facility to achieve the very best benchmarks of quality. Our modernized infrastructure is crowned by means of recent tools and advanced machines that enable us to satisfy the large demands of customers in a dexterous manner. Our products are can further be made-to-order as per the detailed requirements given by our valuable Client..

Types of Unions

Socket Weld Union:

Socket welding involves inserting a steel pipe into a socket hole for welding, hence the term socket weld union. A socket coupling consists of a socket, a spigot, and a socket groove, with the distinctive feature of a socket groove on the spigot, and the spigot and socket located at opposite ends. Socket unions can be widely applied to pipes of various diameters and are also suitable for water meters and valves. Due to the socket structure, pipe joints reduce costs and offer extremely convenient installation, use, and maintenance, while also providing excellent leak prevention capabilities, making them highly promising in the market.

Threaded Union:

Threaded connections involve screwing steel pipes into threaded holes for connection, hence the term threaded union.Threaded unions are the most common type of joint, characterized by using a threaded connection method for pipe connections. They primarily consist of three parts: a male end with external threads, a female end with internal threads, and a nut. By rotating the nut, the sealing surfaces of the male and female ends can be tightly aligned, thereby achieving connection and sealing. Thread forms can include BSP, NPT, G, etc., and the connection is further secured using a locking nut and a seal ring. Suitable for small-diameter pipes, threaded connections achieve pipe sealing. They are easy to install and commonly used in water pipes, gas pipes, and other applications.

MSS SP-83 Union Dimension and Weight

Class 3000 Socket Weld Union Dimension

Dimensions in inches

Class 6000 Socket Weld Union Dimension

Dimensions in inches

CLASS 3000 Threaded Union Dimensions

Dimensions in inches

CLASS 6000 Threaded Union Dimensions

Dimensions in inches

Weight List

SW & THD Union volume

If you want to know more about the weight and volume of forged pipe fittings, please click on the following keywords

• ASME B16.11 Socket Weld Fitting Weight and Volume Chart
• ASME B16.11 Threaded Fitting Weight and Volume Chart

Union Pipe Fittings Applications

Water treatment systems

Petrochemical pipelines

Heating, ventilation, and air conditioning (HVAC) systems

Pharmaceutical and food industry piping

Laboratory and research piping systems

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