Butt Weld Fitting

Definitions and uses

As the professional manufacturer, SN Valve would like to provide you high quality butt weld fitting. Butt-welded fittings are pipe fittings used to change the path of a pipe (e.g., elbows), reduce or increase the diameter of a pipe bore (e.g., reducers), branch (e.g., tees, crosses), or close off a pipe (e.g., butt-welded caps). They are connected to the piping system by welding to form a permanent, leak-proof piping connection.

Types and Shapes

Butt weld fittings come in a variety of shapes and types, including but not limited to:

●Bend: Used to change the direction or flow of water in a pipeline system. Generally, there are three types of elbows: 45, 90, 180, and 90, while 90 and 180 are also referred to as Long Radius (LR) and Short Radius (SR). Long radius elbow center to face distance is 1.5 times the nominal pipe diameter, and short radius elbow center to face distance is equal to the nominal pipe diameter.

●Tee: A branch from the main pipe into another pipe. Tee with equal diameter tee and reductor, equal diameter tee diameter and main tube diameter are the same, and reductor tee diameter is less than main tube diameter.

●Reductor: Used to alter tube diameter. Reducers have two types: concentric and eccentric reducers. Concentric reducers are generally applied to vertical pipes, and eccentric reducers are applied to horizontal ones.

●Tee: Same as Tee, except that Tee can extend two tubes from the main pipe.

●Caps: are used to seal the end of a tube. Caps are available in various shapes and sizes, and are suitable for a wide variety of piping systems.

Material Grades and Sizes

Butt weld fittings are available in various grades and sizes for various pipe systems. Commonly used materials are carbon steel, high-yield carbon steel, low-alloy steel, stainless steel, duplex alloy and Ni alloy. Sizes range from 2 inches to 48 inches (and up), with seamless completion of fittings up to 24 inches, and larger sizes by welding.

Manufacturing Processes

The manufacturing process for butt-welded pipe fittings includes a variety of methods, such as cutting, heating, bending, and welding. For smaller diameter fittings (e.g., up to 24 inches), seamless steel tubing is usually used to make them by cutting, heating, and bending. While for larger sizes, the fittings are fabricated using welded pipes or steel plates.