B16.9 Stainless Steel Fitting Stub End For Lap Joint Flange
ASME B16.9 Stub End is a metallic product that is a rod with threads on both ends. Used in conjunction with a backing flange, a Stub End is, essentially, a short length of pipe with one flared end and one square-cut end, which is welded to a pipe of the same NPS, material grade and schedule. The combination of a Stub End and a backing flange is generally used as an alternative to a standard flange.Lap Joint Stub End Features
Lap joint stub end must have high quality, and it posses features as below:
Thermal stability
Long function life
High mechanical strength
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
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.
| Dimensions |
ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| Sizes |
1/2″NB TO 48 "NB IN |
| Schedule Wall Thickness |
5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS Schedule |
| Types |
Long Stub Ends, Pipe Stub Ends, Butt weld Long Stub Ends, Lap Joint Stub Ends. |
| Steel Grades |
Alloy Steel, Stainless Steel, Duplex, Carbon Steel, Nickel Alloys, Cupro Nickel |
Inspection
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