MSS SP-43 1/2-24 Inch Stainless Steel Lap Joint Stub End Short Pattern A403 WP304 304L

MSS SP-43 1/2- 24 Inch Stainless Steel Lap Joint Stub End Short Pattern A403 WP304 304L 321 316 316L 317L

Description of MSS SP-43 Stainless Steel Lap Joint Stub Ends:

ASTM A403 Lap Joint Stub Ends are essential components used in piping systems to connect pipes with lap joint flanges. These stub ends feature a design that allows for easy assembly and disassembly without disturbing the alignment of the flange or pipeline. They are commonly used in applications where frequent dismantling or maintenance is required.

Manufactured to ASTM A403 standards, these lap joint stub ends are constructed from high-quality materials such as stainless steel, ensuring corrosion resistance and durability. The ASTM A403 specification sets the standards for the dimensions, materials, and tolerances of lap joint stub ends, ensuring a precise fit and reliable operation in various piping systems.

The design of ASTM A403 Lap Joint Stub Ends facilitates quick bolt hole alignment, making them suitable for large diameter or hand-rotated piping configurations. These fittings provide flexibility and ease of maintenance in industrial applications, meeting the requirements for critical piping installations where reliability and performance are essential.

MSS SP-43 specifies short pattern stub ends that can be used with lap joint flanges or slip-on flanges. The radius of the fillet can vary depending on whether it is intended for use with a lap joint flange or a slip-on flange. This variation in the radius of the fillet helps ensure proper alignment and compatibility with the specific type of flange being used in the piping system. MSS SP-43 standards provide guidance on the dimensions and design of short pattern stub ends to facilitate their use in various piping applications with lap joint or slip-on flanges.

MSS SP-43 Lap Joint Stub Ends Dimensions:

Notes:

(1)Dimensions are in millimeters(mm). 

(2)T: the lap thickness, shall not be less than nominal pipe wall thickness.
(3)Type A: radius of fillet if used with lap joint flange; Type B: radius of fillet if used with slip on flange.

Common Materials and Grades of Butt Weld Lap Joint Stub End:

The ASTM A403 specification covers a variety of stainless steel and alloy steel grades for pipe fittings, including lap joint stub ends. Some of the common grades specified in ASTM A403 for lap joint stub ends and other fittings are:

1. A403 WP304: This grade is a commonly used austenitic stainless steel grade with excellent corrosion resistance and weldability.

2. A403 WP304H: A high-carbon version of WP304 with enhanced high-temperature strength and creep resistance.

3. A403 WP304L: The low-carbon version of WP304, which offers better weldability and corrosion resistance in welded structures.

4. A403 WP316: An austenitic stainless steel grade with higher corrosion resistance than WP304, particularly in chloride environments.

5. A403 WP316L: The low-carbon version of WP316, offering improved weldability and corrosion resistance in corrosive environments.

6. A403 WP316H: High-carbon version of WP316 with increased high-temperature strength and creep resistance.

7. A403 WP321: This grade contains titanium, which stabilizes the material against chromium carbide precipitation during welding, making it suitable for high-temperature applications.

8. A420 WPL3/L6: These are low-temperature carbon steel grades suitable for applications requiring impact toughness at low temperatures.

1. Type A Stub End:

   • Used for standard lap joint flanges
   • Lap thickness equal to or greater than the nominal wall thickness of the pipe
   • Outer corner radius suitable for lap joint flange
   • Inner corner is square with a machined serrated face

2. Type B Stub End:

   • Used for standard slip-on flanges as lap flanges
   • Lap thickness equal to or greater than the nominal wall thickness of the pipe
   • Outer corner radius suitable for slip-on flange as a backup flange
   • Inner corner is square with a machined serrated face

3. Type C Stub End:

   • Can be used for both lap joint and slip-on flanges
   • Flared design with a rounded edge at the inside diameter of the lap
   • Lap thickness is 75% of the pipe wall thickness
   • Lap joint is smooth and not machined

Common Types and Lengths:

• Stub ends are typically manufactured in Type A and Type B styles.
• Available in two standard lengths: long (ANSI) or short pattern (MSS).
• Schedule 5s and 10s stub ends usually come in short lengths, while schedule 40s stub ends can be supplied in short or long lengths.

Usages of MSS SP-43 Lap Joint Stub Ends:

Connection Flexibility: MSS SP-43 lap joint stub ends provide a flexible way to connect pipes of different diameters or materials, especially when frequent disassembly and reassembly are required.

Alignment Adjustment: These stub ends allow for easy alignment adjustment during installation, making them suitable for applications where precise alignment of flanges is necessary.

Rotating Back-Up Flange Support: MSS SP-43 lap joint stub ends are often used to replace welded flanges when support for a rotating back-up flange is needed, providing ease of maintenance and repair.

Corrosion Resistance: MSS SP-43 lap joint stub ends made from stainless steel offer excellent corrosion resistance, making them suitable for applications where resistance to corrosive environments is critical.

Pressure and Temperature Variations: MSS SP-43 lap joint stub ends can withstand a range of pressures and temperatures, making them suitable for diverse industrial applications that involve varying operating conditions.

Versatile Flange Compatibility: MSS SP-43 lap joint stub ends can be used with lap joint flanges or slip-on flanges, offering versatility in flange compatibility based on the specific requirements of the piping system.