Difference Between Pipe Coupling Vs Union

The main differentiation between a coupling and a union is that coupling is used to attach a pipe to a pipe or pipe to a swedge, whereas a union is used to join and disassemble a component of a piping system (such as a steam trap or control valve) for maintenance repair.

What is A Pipe Coupling?

A pipe coupling is a short section of pipe that links two steel pipes by a threaded connection. The connection's seal is threaded. The disassembly should be done at one end of the pipe at a time and is usually utilized for pipeline lengthening.

Carbon steel stainless steel alloy steel PVC plastic and other materials are used to make pipe couplings.

Threaded connection welding socket and other pipe coupling connection methods are available.

ASME B1.20.1, DIN2986 and BS10241 are the production standards for pipe couplings.

Forging and casting are used to make pipe couplings (Forging refers to the use of steel ingots or round bars for heating and forging forming and then processing threads on a lathe; Casting refers to the melting of steel ingots and pouring them into a fixed pipe hoop model and then cooling them).

Pipe coupling applications: Pipe couplings are widely utilized in civil construction industry agriculture and other industries because of their ease of use.

What Is A Pipe Union?

A pipe union is a standard pipe connector that is simple to install and dismantle. The nut cloud head and flat connector are the three basic components. And the pipe union is commonly used in pipelines where there are front or back ends of valves water meters and other equipment making it easier to disassemble and maintain this equipment.

Pipe union materials: industrial threaded unions are often constructed of high-pressure-resistant metal. Carbon steel stainless steel alloy steel brass, and other materials are used; threaded unions used in everyday life include PC PVC PE and other materials.

Socket welding and threaded connections are two types of pipe union connections. (Socket welding is the process of welding a steel pipe into a socket.) The threaded connection is used to screw the steel pipe into the screw hole for connection which is why it's termed a "socket "Swivel joint." As a result, it's known as a "threaded union.")

ASME B16.11 and MSS-SP 83 are the basic production standards for pipe unions.

The most frequent sort of pipe fitting in industry and life is a threaded union, which refers to a pipe connection with thread. The threaded union makes the pipeline connection easy to disassemble and replace lowering the cost of the pipeline connection significantly.

Threaded unions come in a variety of sizes including equal and differing diameters.

Pipe Coupling VS Union

In a pipeline couplings are pipe fittings. If the pipeline is longer than a single pipe (for example 4m 6m etc. ) a coupling should be used; the union can be disassembled as a pipe fitting which means that the things connected through the union such as the valve side the radiator side, and so on, can be removed and replaced for maintenance and disassembly. And Pipe unions are most commonly found on threaded pipes and pipes with modest diameters. Flanges etc. are commonly used to join larger pipe sizes, and they are also easy to disassemble.

Pipe couplings come in threaded butt welded and socket varieties whereas pipe unions only come in threaded and socket varieties. Threads can even be used to remove the socket's slip knot. A union eliminates the need to screw the pipe. The pipe must be moved to detach the connection if the union has no threaded connection.

In terms of practical application, the union is utilized for low-pressure situations and pipe coupling is used for high-pressure situations. The union is a threaded connector used in public engineering applications weighing less than 10kg.

Source: https://www.steelsalesco.com/stainless-steel-304-union-supplier-manufacturer/