As we know there are four connecting types for the pipe fittings: Socket weld, butt weld, threaded, and flanged.

In terms of steel pipe fittings for pipeline projects, socket weld fittings and butt weld fittings are two popular options.

However, since each type has its own advantages and disadvantages, you might be unsure about which one is best suited for your specific purpose. To help you make an informed decision, we have prepared a comparison between socket weld and butt weld fittings. Read on to learn more.

What is Socket Weld Pipe Fittings

A socket weld fitting is a type of pipe attachment detail where the pipe is inserted into a recessed area of a fitting, valve, or flange. To join the pipes or valves to other sections of the pipe, fillet-type seal welds are applied. Socket weld fittings are a good choice in certain cases due to their advantages of strong structural strength and high leakage integrity. These factors are important considerations when designing a pipeline project.

How to describe socket weld pipe fittings dimensions correctly

When placing a request for socket weld fittings, it is important to specify the OD (outside diameter) dimensions and the pressure requirements (or thickness schedule). Socket weld fittings have pressure ratings that are typically expressed in class 3000, class 6000, class 9000 and 1500.

Socket weld pipe fittings are usually simplified as SW pipe fittings, so you will see some descriptions like SW elbow, SW tees, SW couplings etc.

Usage about socket weld fittings

Due to their high-pressure capabilities, socket weld fittings are commonly used in a wide range of industrial processes.

• Socket weld pipe fittings, such as elbows, tees, and reducers, can be used in pipelines to convey toxic, flammable, or expensive materials where leakage is not acceptable.
  • Used in conjunction with ASME pipes to facilitate changes in dimensions.
  • Applied in situations where the pipe work is considered to be permanent. They are designed in a way that provides good flow characteristics.
  • Manufactured in accordance with ASTM standards and can also confirm to ASME B16.11. This is a standard that covers dimensions, pressure-temperature ratings, marking, tolerances, and requirements for materials for carbon steel and forged carbon. In terms of acceptable material forms, they include bars, forgings, seamless tubes, and seamless pipes which conform to the requirements of fittings chemicals, mechanical property, and practices.

Socket weld pipe fittings types

Similar to butt weld fittings, socket weld fittings are available in various material types, including stainless steel, carbon steel, and alloy steel. These fittings are used in a wide range of applications and include socket weld elbows, socket weld tees, reducing tees, reducers, cross, union, couplings, and socket weld flanges, among others.

Socket weld fittings have pressure ratings that are typically expressed in class: 3000#, 6000#, 9000#, 1500#