Butt weld fittings are one of the most popular connection types in pipeline systems. It has always been required in large quantities in different industries, and especially for the large diameter pipelines.


What is Butt Weld Fittings?

Butt weld is to connect pipes or fittings ends by welding. It’s a weldable steel pipe fitting that would allow branching off, allowing for change of direction of flow, attaching auxiliary equipment, or reduce the size of the pipe.


In the case of forged steel butt weld fittings, you would find them to be manufactured according to ANSI/ASME B16.9.


Also Known By Welded Pipe Fittings

Butt weld fittings would also be referred to as welded pipe fittings. When these would be used in stainless steel and carbon steel, they would be able to offer certain advantages as compared to socket weld and threaded fittings. Whereas socket weld would only be available up to a specific size, you would find butt weld fittings to be available in sizes starting 1/2 inch to 72 inch.


Like general category of pipe fittings, Butt weld pipe fittings include:

  • Butt Weld Elbow In 45 Degree Or 90 Degree
  • Butt Weld Tee And Reducing Tee, Reducer, Cap, Cross


Butt Weld Elbow

Butt Weld Elbow

Butt weld elbow is to change fluid direction in pipeline systems; it has long radius (LR) and short radius (SR) types, and has different degree covers 45 degree, 90 degree and 180 degree.


Butt Weld Tee

Butt Weld Tees

Butt weld tee (equal tee) has a 90 degree branch along with a straight pipe, it will provide a connects for to install an additional equipment to a pipeline. With the tee structural, same sides of the ends could be welded to the pipe, 90 branch was left open for weld another pipe or a device.


Butt Weld Reducer

Butt Weld Reducers

Butt weld reducer has concentric reducer and eccentric reducer two types, used for adjust the fluid rate and speed, by welded a large diameter pipe on one end and a smaller diameter pipe on the other end.


Common Material Types of Butt Weld Fittings

Same with socket weld fittings, you would now be able to find butt weld fittings to be available as butt weld elbow, tee, out lets (olets), reducers, and caps. In fact, these would be some of the most common type of butt weld fitting and would be specified according to schedule of pipe and nominal pipe fittings.


  • Body Material

It includes different body materials of alloy, stainless and carbon steel butt weld fittings. Therefore, it usually uses welded or seamless pipe as the starting material. It could be manufactured by forging, with the help of multiple processes, in order to get the shape of tees and elbows, amongst the other things.


  • Stainless Steel Butt Weld Fittings Usually In Thin Thickness

Just like you would find normal pipe to be sold from Schedule 10 to Schedule 160, you would find the case to be same for butt weld fitting as well. In stainless steel, butt weld fittings have been found to be more common. This would be thanks to the cost advantage that it has to offer. Schedule 10 fittings would also be more common in stainless steel fittings.


  • Carbon Steel Butt Weld Fittings

Carbon steel butt weld fittings includes body material in ASTM A234 WPB (most commonly) and WPC, MSS-SP-75 WPHY. And thickness usually at schedule 40 steel pipe fittings, STD, or 80, where pressure class ranged with 1500 psi, 2500 psi, 3000 psi, 6000 psi and 9000 psi.


  • Alloy Steel Butt Weld Fittings

Alloy steel butt weld material usually in ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91 etc.


  • Classified By Dimensions

Butt weld pipe fittings dimensions referred to the pipe dimensions standard ANSI B36.10 and B36.19.

Diameter range: 1”, 2”, 3”, 4”, 6”, 8” and up to 36”.

Thickness range: Schedule 10, schedule 40, schedule 80, XS, XXS and SCH 160


Where fitting dimensions of butt weld fittings are concerned, this would consist diameter in NPS and thickness in schedule.


Concentric reducer, eccentric reducers, long radius elbow, tees. The primary reason why these fittings would be used in construction projects is because they would play an important part in branching off, changing the direction of flow, or even mechanically joining equipment to the system. With the help of specified pipe schedule, butt weld fittings would be sold in nominal pipe sizes.


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Article Source: https://www.octalsteel.com/butt-weld-pipe-fittings