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

Structural Advantages of Union ​

Excellent Sealing Performance: The gasket is the key to ensuring the sealing performance of union. High-quality gaskets fit tightly to the male and female ends, effectively preventing medium leakage and ensuring the safe operation of the pipeline system.​

Easy Installation and Removal: When maintenance or component replacement is required, simply disassemble the union, complete the operation, and then retighten it, saving time and effort.​

High adaptability: Union couplings can accommodate connections between pipes of different diameters and materials. Whether it is metal or plastic piping, as long as the thread specifications match, union can be used for connection.

Material & Grades of Forged Unions:

Carbon Steel Threaded Flanges :
Carcon Steel: ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70

Alloy Steel Threaded / Screwed Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91

Stainless Steel Threaded Flanges :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex & Super Duplex Steel Threaded Flanges :
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61

Copper Alloy Steel Threaded Flanges :

 ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy Threaded Flanges :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No.N10276), Alloy 20 (UNS No. N08020)

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 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.

Class 3000 Socket Weld Union Dimension

CLASS 3000 Threaded Union Dimensions

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

How to Choose the Right Union Pipe Fitting?

Working medium and temperature: Determine the type of fluid and temperature, and select the appropriate material.

Working pressure: Ensure that the pressure rating of the union fitting exceeds the working pressure of the system.

Pipe size: Match the outer diameter, inner diameter, and thread specifications of the pipe.

Installation and Maintenance of Union Fittings

Installation: Before installation, clean the threads of the pipe and union fitting to remove debris and burrs. During installation, connect the male and female ends to the pipe separately, ensuring the tightening force is appropriate to avoid over-tightening or under-tightening. Additionally, ensure the gasket is properly installed to provide effective sealing.

Maintenance: Regularly inspect the union quick-connect fitting for leaks, loosening, or other issues. If the gasket is found to be aged or damaged, it should be replaced promptly. For pipeline systems that are not in use for extended periods, the quick-connect fitting should be disassembled, cleaned, and lubricated regularly to prevent thread rusting and seizing.

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ZIZI ENGEERING are manufacturers of stainless steel socket weld union. We can supply high quality MSS SP-83 Union offer you the best prices in the market. Stainless steel socket weld unions are designed for wide use in different industries.

Stainless Steel Socket Weld Union Material & Grades

We can supply stainless steel socket weld union for connecting pipes in many industrial processes that no leakage can be permitted. And limited by its manufacturer standard, MSS SP-83 more suitable for small diameters application below 3 inch.

MSS SP-83 Socket Weld Union

MSS SP 83 is the specification for socket weld and threaded union which cover size tolerance, marking, material etc.

MSS SP-83 stainless steel socket weld union is an active pipe connection fitting with the feature of easy for assemble and disassemble. It can be widely used in different diameters pipeline connection, and the connection of meter and valve with pipe line.

Dimension of Stainless Steel Socket Weld Union

Weight List(KG)

Socket Weld Union VS Threaded Union

Stainless steel socket weld union and threaded union are two different types of fittings. They have significant differences in structure, connection method, application scenarios.

Structural

Socket weld union: It is usually composed of sockets, sockets, socket slots, and other parts.

Threaded union: It refers to threaded pipe connectors, usually composed of nuts, cloud heads, flat joints, and other parts.

Connection method

Socket weld union: Socket welding is the process of inserting steel pipes into socket holes for welding, hence it is called a “socket joint”.

Threaded union: Threaded connection is the process of screwing steel pipes into screw holes for connection, hence it is called a “threaded flexible joint”.

Application scenarios

Socket weld union: Due to its structural characteristics and connection methods, plug-in joints are widely used in heavy machinery, large structures, and situations that require high leak prevention capabilities.

Threaded union: Threaded joints are more common in small mechanical equipment, pipeline connections, and situations that require frequent replacement or maintenance due to their convenient and fast connection characteristics.

ASTM A182 Socket Weld Union

ASTM A182 forged pipe fittings refer to pipe fittings forged from alloy, stainless steel, or duplex steel materials. These material typically have excellent corrosion resistance, good mechanical properties to ensure the safe, and operation of pipeline.

Chemical Composition of Stainless Steel Socket Weld Union

Mechanical Properties

Advantage of Stainless Steel Socket Weld Union

Stainless steel socket weld union, as a type of pipe made of malleable stainless steel, has various advantages.

Corrosion resistance

High strength

Easy installation and disassembly

Good sealing performance

Strong adaptability

Aesthetics

Economy

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What is MSS SP-83 Specification

ZIZI ENGEERING CO LTD is professional and experience in servicing and producing all types of pipe fittings. MSS SP-83 Union is one of the main products of ZIZI ENGERING CO LTD.

MSS SP 83 is the specification for socket weld and threaded union which cover size tolerance, marking, material etc.

MSS SP-83 union is an active pipe connection fitting with the feature of easy for assemble and disassemble. It can be widely used in different diameters pipeline connection, and the connection of meter and valve with pipe line. Generally, a complete union shall consist of three parts: male end, female end, and nut. The two ends connect two pipes and the nut connects the two ends like a coupling. It is forged with round steel or ingot and then lathed into shape. It connects pipes by threads and includes internal thread type and external thread type.

We Can Supplied MSS SP-83 Union scope

ASTM A105 Carbon Steel Union

ASTM A105 union is forged fittings made of carbon steel material, generally produced according to the MSS SP-83 standard. ASTM A105 Union is widely used in various pipeline systems due to their superior performance and low cost.

Chemical Composition

Mechanical Properties

ASTM A105 Union have been widely used in pipeline systems due to their high strength, excellent sealing performance. MSS SP-83 Union can providing important guarantees for the safe and stable operation of pipeline systems.

ASTM A182 MSS SP-83 Union

ASTM A182 forged pipe fittings refer to pipe fittings forged from alloy, stainless steel, or duplex steel materials. These material typically have excellent corrosion resistance, good mechanical properties to ensure the safe, and operation of pipeline.

Alloy Steel Material Chemical Composition

Alloy Steel Material Mechanical Properties

Stainless Steel Material Chemical Composition

Stainless Steel Material Mechanical Properties

MSS SP-83 Union should be paid to their quality and performance to ensure the safety, and efficiency of fluid transportation.

MSS SP-83 Union Dimension and Weight

Class 3000 Threaded Union Dimension

Class 3000 Socket Weld Union Dimension

Weight List of MSS SP-83 Union

Why Choose Us for MSS SP-83 Union

ISO and CE certified quality

Short delivery

Safe package

Abundant stock

Reasonable price

One stop service

Full specification

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