Buttweld pipe fittings comprise of long radius elbow, concentric reducer, eccentric reducers and tees. They are an important part of industrial piping systems to
- A change in direction for the liquid flowing through the pipes
- Branching of the pipe to allow the liquid to flow in two separate directions
- A reduction in pipe diameter
- The attachment of auxiliary equipment
- The end of the pipeline
Types of 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 degrees, 90 degrees, and 180 degrees. Buttweld elbow is a steel elbow formed by hot pressing or forging. Its connection form is to directly weld the elbow and steel pipe. Butt-welded elbows are mainly used for elbow with higher pressure and temperature than other connection types (socket welded elbow or threaded pipe elbow).
Buttweld 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. The branch diameter is smaller than the main diameter. The reducing tee is usually described as NPS diameters
Buttweld Eccentric Reducer
A conically shaped fitting that reduces or enlarges the diameter, but it is not symmetrical about the centerline. This is used in pipe-work systems for reducing the diameter of a pipe from one size to larger or small size.
Buttweld Stub Ends
Lap joint stub end is a fitting that is used to replace welded flanges when the support of a rotating backup flange is required. And it can be supplied in standard and non-standard ANSI dimension that is used for connecting pipes of different diameter.
Butt Weld Tee / Buttweld Equal 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. Buttweld tee is widely used in petroleum, aerospace pharmacy, chemical industry, metallurgy, electric power, military industry, engineering support, and other industrial pipelines. Three branches of tee have the same diameters. Also named as Straight Tee
Buttweld Concentric Reducer
This reducer consists of the symmetrical and conical shaped fittings that enlarge or reduce the diameter equally about the centerline. For example, when 1” pipe transitions to ¾” pipe, then the top or bottom of the pipe do not remain level. It is widely used when single or multiple diameter changes.
Buttweld Cap
ButtWeld Pipe End Caps are usually welded to the pipe end or mounted on the external thread of the pipe end to cover the pipe fittings. To close the pipeline so the function is the same as the pipe plug.
Buttweld Return Bend
The function of a 180 degree return is to change direction or flow through 180 degree and there are two basic types, long radius and short radius. Both types have a centre to centre dimension double the matching 90 degree elbow.
| Duplex & Super Duplex | UNS S32750, UNS S32760, UNS S31803 |
| Hastelloy Alloys | ASTM B366 Hastelloy B2, Hastelloy C276, Hastelloy C22 |
| Incoloy Alloys | ASTM B366 Alloy 20, Alloy 800H/800HT, Alloy 825, Alloy A286 |
| Inconel Alloys | ASTM B366 Alloy 600, Alloy 601, Alloy 625, Alloy 718, Alloy 725 |
| Monel Alloys | ASTM B366 Monel 400, Monel K500 |
| Copper Brass | CuNi 90:10 & 70:30 |
| Stainless Steel | ASTM A403, WP304, 304L, 304H, 310, 316, 316L, 317, 317L,321, 347, 904L |
| Carbon Steel | ASTM A234 WPB, A420 WPL3, A420 WPL6, MSS-SP-75 WPHY 42/46/52 |
| Alloy Steel | ASTM A234 WP1, WP5, WP9, WP11, WP22 |
| Size | 1/4″NB to 24″NB(Seamless) 4″NB to 72″NB (Welded) |
| Wall Thickness | Sch 5s to Sch XXS |
| Types | Tee(Equal/Unequal), Elbow, Reducing Tee, Long / Short Stub Bend, Reducer (Concentric/Eccentric), Return Bend, Cap, Etc. |
