Carbon Steel Lap Joint Flanges are pipe fittings used in conjunction with a stub end to form a flange connection. They are ideal where frequent dismantling, alignment flexibility, or ease of maintenance is needed. Unlike weld-neck or slip-on flanges, the lap joint flange does not weld directly to the pipe — instead, the pipe is welded to the stub end, and the flange itself “laps” over it.
Carbon Steel Lap Joint Flanges
Core Functions
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Provides a removable flange connection for piping systems
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Facilitates easy installation, inspection, and maintenance
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Allows alignment of bolt holes independently of pipe orientation
Key Features
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Material: Carbon steel (e.g., A105, A350 LF2) — strong and cost-effective for many industrial applications
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Two-Piece Design:
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Stub End: Welded to the pipe
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Lap Joint Flange: Slides over the stub end and bolts to the mating flange
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Alignment Flexibility: Flange can rotate freely around the stub end to align bolt holes easily
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Standards Compliance: Manufactured to ASTM/ASME, DIN, EN, and other relevant standards
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Pressure Ratings: Available in standard ANSI/ASME pressure classes (e.g., 150 #, 300 #, 600 #, etc.)
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Surface: Prepared flange face for gasket seating and tight sealing
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