Butt Weld Stub End

What is a Stub End

Lap joint stub end is generally matched with flange and benefit the flange to align bolt holes smoothly. There are two types that long pattern and short pattern

Butt weld stub end is a fitting that is used replace welded flanges when the support of a rotating back up flange is required. And It can be supplied in standard and non-standard ANSI dimension that is used for connecting pipes of different diameter.

The usage of butt weld stub end makes flanges can be rotated which is beneficial for aligning bolt holes. It also can adapt different thickness and material grades pipe to be connected.

Specification for Butt Weld Stub End

Product features

Where constant disconnection and dismantling of pipes are needed, are benefited through these fittings as they give a quick disassembly, allowing inspection and cleaning of pipeline.

Butt weld stub end do not need to be of the same material as pipes and short ends, but can be of lower grade, thereby reducing the total cost of flange joints in high material grade piping systems.

Because the lap joint stub end can be rotated to facilitate the alignment of bolt holes, the installation process is accelerated.

Stub End Types

Stub end are offered in three different ways, type A, B and C. Type A and B stub end are similar to forged fittings, such as elbows and tees, and type C stub end are made in customized sizes.

Type A

The type A stub end is used for standard lap joint flange. The lap thickness on the stub end is greater than or equal to the nominal thickness of pipe wall. In addition, the outer corner radius of the type A can receive the lap joint flange. The inside corner is square. Lap usually has a machined serrated face.

Type B

The type B stub end is used for standard slip on flanges as lap flanges. The lap thickness on these short ends is greater than or equal to the nominal thickness of pipe wall. Also, the outer corner radius of type B is small enough to receive the slip o flange that can be used as a backup flange. The inner corner is square. Lap usually has a machined serrated face.

Type C

The type C stub end can be used for standard lap joint flange and slip on flange. It is flared leaving a rounded edge at the inside diameter of the lap. If necessary, the radius can be made closed to a square. The lap thickness is 75% of the pipe wall. The type C is very short enough to accommodate any backup flange. The lap joint on type C is smooth, and it is not machine

Common Types and Lengths for Stub End

Stub ends are usually manufactured in two ways, Type A and Type B. They are available in two standard length, long (ANSI) or short pattern (MSS).
Schedule 5s and 10s stub end are usually offered in short lengths, and long lengths are available on special order. Schedule 40s stub end are supplied in either short or long lengths

Benefits of butt weld fittings

The welded connection ensures a stronger and more secure connection.
The continuous structure of the metal adds to the overall strength of the piping system.
When butt weld fittings are matched with the appropriate pipe schedules, they provide a seamless flow inside the pipe.
They offer the flexibility of different turn radii by using Long Radius, Short Radius, or 3R elbows.
Butt weld fittings are typically more cost-effective compared to socket weld or threaded fittings.
These fittings are available in Schedule 10, providing a thinner wall option.
Butt weld fittings are commonly used in Schedule 10 and Schedule 40 configurations.