Butt weld is to connect pipes and fittings ends by butt welding process. Also known by welded pipe fittings. It has ends in beveled or plain, dimensions normally from 3/4'' to 24''. Manufactured according to ASME B16.9. Material in carbon, alloy and stainless steel.
Unlike the socket weld fittings sizes below NPS 2'', butt weld fittings size can reach to a specific range, you will find that the butt weld fittings range in size from 1/2'' to 72''.
Types for Butt Weld Fittings
Ranges from usage and functions, butt weld fittings includes elbow, tee, reducer, cap, and lap joint stub end.
Ranges from material types, includes carbon steel butt weld fittings, alloy and stainless steel butt weld fittings.
Butt Weld Elbow
The butt weld elbow is designed to change the direction of the fluid in the piping system. It has a long radius (LR) and a short radius (SR) type, and has different degrees covers to: 45 degree, 90 degree and 180 degree.
45 Degree BW Elbow
90 Degree BW Elbow
18 Degree BW Elbow
For example a description like:
Elbow, BW, 45 Degree, LR, NPS 6, SCH 40. Means the elbow in butt weld type, angle in 45 degree, length long radius (1.5 x diameter), thickness in Schedule 40.
A description like:
Elbow, BW, 90 Degree, SR, NPS 8, SCH80. Means butt weld elbow, fluid direction 90 degree, length in short radius (1 x diameter).
More than 90 degrees of elbow, we call it steel bend. Like LR / SR 180 degree bend.
As we talked above, butt weld elbow dimensions can be specified as diameter (in NPS) and thickness according to ANSI B16.9, length in LR or SR.
Butt Weld Tee
The butt weld tee (equal tee and reducing tee) has a 90 degree branch and a straight line pipe that will provide a connection to install another device for the pipeline systems.
Butt Weld Equal Tee
Butt Weld Reducing Tee
Butt weld reducer tee
The same structure of the T shape, but the size of the 90 degree branch is smaller than the diameter of the straight line pipe. Therefore to install a smaller size pipe or fittings.
Butt Weld Reducer
Butt weld reducer can adjust the flow rate and speed. One end welded with a large diameter pipe and another end with a smaller OD pipe. It has two types:
Concentric and Eccentric Reducer.
Materials of Carbon Steel Butt Weld Fittings
Carbon Butt Weld Fittings includes below standards and grades:
ASTM A234 WPB (most common)
ASTM A234 WPC (higher than WPB)
Materials of Alloy Steel Welded Pipe Fittings
Standards and Grades:
ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91 etc.
Stainless Steel Butt Weld Fittings
Standards and Grades:
ASTM A403, ASTM A312, WP304/304L/316/316L and etc.
Stainless steel welded pipe fittings mostly in thin thickness, as SCH 10, SCH 10S, SCH 20, SCH 20S, since this will be a cost advantage for the stainless steel material.
Butt Weld Dimensions
Butt Welded Pipe Fittings Dimensions refer to pipe size standards ANSI B36.10 and B36.19.
Diameter range: 1″, 2″, 3″, 4″, 6″, 8″ and maximum 72″.
Thickness range: Schedule 10, Schedule 40, Schedule 80, XS, XXS and SCH 160
In the case of involving mounting dimensions of butt welded fittings, this will include the diameter in the NPS and the thickness in the schedule.
Benefits of Butt Weld Fittings
Continuous metal structure increases the strength of the piping system
• Various turning options and easy to weld.
• Butt weld saves more cost than socket weld or threaded.
• Allow thin thickness as SCH 10 or SCH 10S.
• Compatible with different sizes from 1/4 inch to 24 inch and up to 72 inch.
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Material standard ASTM A234 WPB, WP5, WP9, WP11, WP22. Dimensions up to 48 inch.