Lap Joint Stub End
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A Lap Joint Stub End is a specialized butt-weld fitting used paired with a loose Lap Joint Flange to create a rotatable, easily aligned flanged connection. Core Design & Function Structure: Short pipe segment with one beveled end (for butt-welding to pipe) and one flared/lapped face (sealing surface).Flange Compatibility: A loose Lap Joint Flange slides over the stub end and rotates freely to align bolt holes.Sealing: The flared face of the stub end acts as the gasket sealing surface (the flange itself does not touch the fluid). Key Types (MSS SP-43 / ASME B16.9) Type A (Standard): For standard Lap Joint Flanges (most common).Type B: For Slip-On Flanges / Backing Flanges.Long Pattern (LP) / Short Pattern (SP):Short (SP): Economical, low-pressure systems.Long (LP): Extra length for high-pressure/temperature. Key Features Rotatable Flange: Flange spins independently → perfect bolt hole alignment, easy installation.Material Savings: Stub End = system material (e.g., stainless steel); Flange = cheaper carbon steel.Easy Maintenance: Flange can be removed without cutting the welded stub end.Standards: ASME B16.9, MSS SP-43, ANSI B16.28.Materials: Carbon steel (WPB), Stainless (304/316L), alloy steel. Applications Systems needing frequent disassembly (cleaning/inspection).Piping with dissimilar metals (reduces galvanic corrosion).Stainless steel/high-alloy systems (cost-effective alternative to Weld Neck Flanges).Oil/gas, chemical, power, water treatment, food processing.
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Main products: WN, SO, PL, BL flanges, elbows, tees, reducers, caps. Materials: carbon steel, stainless steel, alloy steel. Standards: ASME, ANSI, EN, JIS, DIN. Export to global pipeline projects. Contact Us