Butt Weld Fittings

Fittings technical Info 

Butt weld fittings get their name from the method for which they attached to a piping system.  Each end of a butt weld fitting is beveled, and it is attached by butting the fitting up to the adjoining pipe and welding along the bevel.  This connection is both stronger and smoother than threaded or socket weld connections, making butt weld fittings the preferred product for critical applications.

MSI is a full-line distributor of butt weld fittings, offering carbon steel, stainless steel, and exotic alloys. With sizes ranging from 1/4” to 48", MSI can provide the butt weld fittings required for virturally any piping project.

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Butt Weld Fitting—MSI Supply, Inc. Get A Quote

 

 

Inventory

MSI Supply can often provide the items listed below for a same-day delivery.  Large quantites, custom sizes, and special alloys (Alloy 20, Monel, Hastelloy, Inconel, Titanium, etc) may be subject to a longer lead time for delivery.

Size Range: 1/4" to 48" Diameter
Types: 90, 45, 180, Tee, Cross, Ecc Reducer, Conc Reducer, Cap, Stub End, Lateral, Swage Nipples, Bull Plugs, Pipe Nipples
Schedules: 5, 10, 40 (STD), TRUE 40, 80 (XH), TRUE 80, 100, 120, 160, XXH
Carbon Steel: A234 WPB, Y52, Y60, Y65, Y70
Stainless Steel: 304, 310, 316, 321, 347
Exotic Alloys: A20, C276, Duplex 2205, AL6XN, A200, A600, Monel, Inconel, Incoloy

 

Ordering Information

There are some need-to-know details when purchasing butt weld fittings, such as: diameter, schedule, material, the shape/type of the fitting, and whether it is seamless or welded construction (A234 WPB carbon steel butt weld fittings come seamless below 24”). 

Wall Thickness

The schedule of the butt weld fitting must match the schedule of the butt weld fittings it is being welded to.  These schedules are outlined in the butt weld fittings chart section of the website.  

Material and Construction

The following offers an in-depth view of the butt weld fitting material grades sold by MSI Supply.  Each link below will provide the chemical composition, manufacturing specifications, yield and tensile strength, as well as other specific product and grade information.

Carbon Steel Butt Weld Fittings

  • 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 fittings (specifically grade WPB) and is seamless 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 ferritic 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.

Stainless Steel Butt Weld Fittings

  • A403 - Seamless and Welded Stainless Butt Weld Fittings: This specification covers the standard for seamless and welded wrought austenitic stainless steel butt weld fittings for pressure piping applications. 

Special Alloy Steel Butt Weld Fittings 

Special alloy butt weld fittings are used for applications that require more demanding performance, such as extreme temperature and corrosive resistance.  Each of the following exotic alloys provides unique attributes for such engineered applications.  Applications for these alloys include, but are not limited to: chemical processing, chemical storage, pollution control, waste treatment, food processing, and pharmaceutical equipment.

Types of Butt Weld Fittings

Tees

Tees are butt weld fittings used to combine or divide process flow, and Reducing Tees additionally allow for butt weld fittings size change.  The run outlets of the tee are the two in-line outlets, and the branch is the third outlet.  The branch outlet is the reducing outlet in a reducing tee.

Butt Weld Fitting Tee, with a diagram showing the branch and run outlets of the butt weld fitting tee

Elbows

An elbow is a butt weld fitting is used to change the direction of flow in a piping system, usually at the 90° or 45° angle. Like a reducing tee, reducing elbows also exist to simultaneously change flow direction and reduce flow diameter.  90 degree elbows are also available in both short radius and long radius patterns, whereas 45 degree elbows are only available as long radius.  

Butt Weld Fitting Elbows. 90 degree elbow and 45 degree elbow

Long Radius (LR) vs Short Radius (SR) Elbows

Long Radius vs Short Radius elbows.  Butt Weld Fittings

A long radius butt weld elbow has a radius of curvature (Identified as “A” in the above drawing) is 1.5 times the nominal diameter, and a short radius butt weld elbow has a curvature that is 1.0 times the nominal diameter of the butt weld fitting. Long radius butt weld elbows give less frictional resistance to the fluid than the short radius butt weld elbows.  Short radius butt weld elbows are generally cheaper and can be used where space is a concern, but they also create a greater pressure drop than long radius butt weld elbows.

Bend vs Elbow

There is often confusion around bends and elbows.  Bends are generally made or fabricated as per the need of the piping design, whereas elbows are manufactured in mass quantities, conform to industry standard size specifications, and available off the shelf. Butt Weld Fitting bending techniques also face constraints regarding material thinning, and if not done properly, there can be concerns regarding the pressure integrity of the line being maintained.  Elbows are most commonly used for SR and LR bends, but when the curvature exceeds 3R, bends are most commonly utilized. 

Reducers

Reducers are butt weld fittings used to facilitate a reduce the flow diameter in a piping system.  Concentric reducers are most commonly used, as they create less friction for the fluid flow, however, eccentric reducers are utilized when space  or alignment is a concern. 

Concentric and Eccentric Reducers,  butt weld fittings.

Cross

Crosses are a 4 way butt weld fitting, with 1 inlet and 3 outlets or vice versa.  These are sometimes referred to as 4-way tees.

Butt Weld Fitting Cross

Caps

Caps are butt weld fittings used to terminate the flow, welding to the end of a butt weld fitting or pipe.

Butt Weld Fitting Caps

Butt Weld Fitting Manufacturers

Approved Carbon Steel Butt Weld Fittings Manufacturers

Name

Country

Awaji Sangyo K.K.

Japan

Benkan

Japan

Canadoil Forge LTD

Canada

Erne Fittings

Austria

Flo-Bend Inc

USA

Hackney Ladish Inc

USA

Mills Iron Works

USA

Piana S.p.A.

Italy

Proclad International Forging Ltd

UK

Promat BD Ltd

UK

PSL Limited

India

RMA Machinen und Armaturenbau

Germany

Shaw Alloy piping products (APP)

USA

Steel Forgings, Inc

USA

Tae Kwang Bend

KOREA

Tecnoforge S.p.A.

Italy

Tectubi

Italy

Tenaris Riga 

Mexico

Thai Benkan Co Ltd

Thailand

Tube Forgings of America Inc.

USA

Tube Line

India

Uhlig

German

Viar Meccanica Srl

Italy

Weldbend Corporation

USA

Westbrook

USA

WFI

USA

Wilhelm Geldbach Industries

Germany

 

Approved Stainless Steel Butt Weld Fittings Manufacturers

 

Name

Country

Canadoil Forge LTD

Canada

Erne Fittings

Austria

Erne Fittings

Austria

Jiangsu Huayang

China

Proclad International Forging Ltd

UK

Promat BD Ltd

UK

RMA Machinen und Armaturenbau

Germany

Shaw Alloy piping products (APP)

USA

Tae Kwang Bend

KOREA

Taylor Forge of Canada

Domestic

Tecnoforge S.p.A.

Italy

Tectubi

Italy

Thai Benkan Co Ltd

Thailand

Tube Line

India

Uhlig

German

Viar Meccanica Srl

Italy

Westbrook

USA

WFI

USA

Wilhelm Geldbach Industries

Germany

Wilhelm Schulz

Germany