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Butt weld fitting 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.
Carbon steel butt weld fittings are made up of carbon steel which has a limited range of ingredients in its composition. Carbon steels have high hardness and wear and tear properties. The fittings made up of carbon steel are applied through various industrial, commercial and domestic applications.
Carbon Steel Butt Weld Fittings Specification
There are different grades, classes, schedules and pressure ratings of these pipe fittings. The schedules correlate to the wall thickness, outer diameter and the pressure containment capacity of a particular pipe fitting.
| Specification | ASME/ ANSI B16.9 | ASME B16.28 | MSS-SP-43 | BS1560 | BS4504 | BS10 |
| Thickness of Fitting | SCH 10, SCH20, SCH 30, STD SCH 40, SCH 60, XS, SCH80, SCH100, SCH 120, SCH 140, SCH160, XXS available with NACE MR 01-75 |
| Types | Seamless | Welded | Fabricated |
| Size Range | 1/2” to 24″ |
| Surface | Painting, PE Coating, Galvanizing |
| Material | ASTM A234 WPB, A860 WPHY42, WHPY52, WPHY60, WHPY65, WPHY70, A420 WPL3, WPL6, WPL9 |
ASTM A234 – Wrought Carbon and Alloy Steel Butt Weld Fittings : This specification covers wrought carbon steel and alloy steel butt weld fittings of seamless and welded construction. This is the most common material for carbon steel butt weld fittingsn and size for seamless is up to 24”, where diameters of 24” or larger may come seamless or welded. These butt weld fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures.
ASTM A860: This specification covers wrought high-strength carbon steel butt weld fittings of seamless and electric fusion-welded construction covered by the latest revisions of ASME B16.9 and MSS-SP-75. These butt weld fittings are for use in high-pressure gas and oil transmission and distribution systems.
Types of CS Pipe Fittings
Butt weld fittings are pipe fittings used to change of direction of flow, to branch off, reduce pipe size or attach auxiliary equipment. Butt weld pipe fittings in carbon steel and stainless steel are the joining components that make possible the assembly of valves, pipes and equipment onto the piping system. Carbon steel butt weld fittings use seamless or welded pipe as starting material and process to the shape of elbows, tees & reducers by hot and cold forming.
Carbon Steel Butt Weld Elbow
90 Degree Elbow
90 degree elbow change the oil and gas flow direction by 90 angle. And have long radius (LR) and short radius ( SR) types. LR means 1.5D and SR means 1D.
45 Degree Elbow
Almost same as above, just the angle is 45 degree. By the way, the weight is half of 90 degree elbow.
180 Degree Elbow
180 degree elbow is a pipe fitting that bends the pipeline by 180 degrees. It is used when a large directional change is needed or when a pipeline needs to be reversed without creating back flow.
Size & Schedule
1/2″ ~ 60″ & DN15 ~ 1500
SCH 20, STD, 40, XS, 80, 100, 120, 140, 160, XXS
Butt Weld Tee
Carbon Steel Equal Tee
The run pipe diameter is same to branch diameter, so we call it straight tee sometimes. It is used to connect pipelines with a pipe at a right angle with the line.
Carbon Steel Reducing Tee
From the name, we can know the three sizes are different, strictly speaking, the branch diameter is smaller than run pipe.
Size and Thickness
1/2″ ~ 60″ & DN15 ~ 1500
SCH 10S, 20, STD, 40, XS, 80, 100, 120, 140, 160, XXS
CS Butt Weld Reducer Fittings
Carbon steel concentric reducer is often used inline on a vertical flow application, or if laid horizontally, as an increaser.
Carbon Steel Eccentric Reducer
An eccentric reducer is also called welded eccentric coupling. It allows for welding a large pipe to a smaller pipe with an offset center line.
Size and Thickness
1/2″ ~ 48″ & DN15 ~ 1200
SCH 10S, 20, STD, 40, XS, 80, 100, 120, 140, 160, XXS