MSS SP-43 Stainless Steel Lap Joint Stub End Short Pattern attach the Lap Joint Flange to Industrial Piping Systems

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

MSS SP-43 Stainless Steel Lap Joint Stub Ends are essential components used in piping systems to connect pipes with lap joint flanges. These stub ends feature a design where one end is designed to mate with a lap joint flange, allowing for easy assembly and disassembly without disturbing the alignment of the flange or pipeline.

Constructed from high-quality stainless steel materials, these lap joint stub ends are known for their corrosion resistance and durability, making them suitable for a wide range of industrial applications where superior performance is required.

MSS SP-43 specifies the standards for the dimensions, materials, and tolerances of stainless steel lap joint stub ends to ensure precision fit and reliable operation in various piping systems. These fittings provide flexibility and ease of maintenance in applications that require frequent dismantling or adjustments.

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:

1. Stainless Steel:

   • Grades: 304/304L, 316/316L, 317/317L, 321/321H, 347/347H
   • Stainless steel lap joint stub ends are widely used in applications requiring corrosion resistance, high-temperature strength, and durability. They are commonly used in industries such as chemical processing, food and beverage, pharmaceuticals, and oil and gas.

2. Carbon Steel:

   • Grades: ASTM A234 WPB, ASTM A860 WPHY42, WPHY46, WPHY52, WPHY60, WPHY65, WPHY70
   • Carbon steel lap joint stub ends are suitable for applications where high strength and resistance to mechanical stress are required. They are commonly used in industrial piping systems, power generation, and petrochemical plants.

3. Alloy Steel:

   • Grades: ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91
   • Alloy steel lap joint stub ends are utilized in applications where enhanced mechanical properties, such as high-temperature strength and corrosion resistance, are necessary. They are commonly found in industries such as oil and gas, power generation, and chemical processing.

4. Duplex Stainless Steel:

   • Grades: S31803 (2205), S32205
   • Duplex stainless steel lap joint stub ends offer excellent corrosion resistance and high strength, making them suitable for demanding applications in chemical processing, offshore and marine environments, and desalination plants.

5. Nickel Alloys:

   • Grades: Alloy 200, 201, 400, 600, 625, 800, 825, C276
   • Nickel alloy lap joint stub ends are used in applications requiring exceptional resistance to corrosion, high temperatures, and aggressive chemical environments. They are commonly employed in chemical processing, aerospace, and marine industries.

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.