Steel Pipe Flanges
Complete range of industrial-grade flanges engineered for every pressure class, temperature range, and application requirement. 19 flange types spanning ASME, ANSI, API, AWWA, and DIN standards.
19 Flange Types
Complete Flange Catalog
Weld Neck
High-pressure, high-temperature service with superior strength and fatigue resistance. Integral bore diameter provides smooth flow transitions. Ideal for critical applications requiring maximum structural integrity.
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Materials
Slip-On
Low-pressure applications with simple, low-cost installation. Two bolts through the flange bore simplify alignment during assembly. Common in non-critical piping systems and maintenance-heavy environments.
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Materials
Threaded
Small-bore piping without welding. Female threads on the flange hub insert accept male-threaded pipe or fitting. Pressure-rated to ASME B16.5 for Class 150 and above in suitable materials.
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Materials
Socket Weld
Small-bore, high-pressure applications. Socket recess accommodates pipe insertion; fillet weld locks the joint. Superior to slip-on under cyclic loading and thermal stress.
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Blind
Dead-leg termination and test point closure. Solid face with no bore provides sealing surface for blank-off service. Engineered for pressure containment without internal flow.
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Lap Joint
Rotating alignment and simple disassembly. Lap joint flange pairs with a stub end to allow 360° rotation for bolt hole alignment. Preferred in modular piping systems.
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Reducing
Connect pipes of different nominal pipe sizes without intermediate fittings. Stepped bore transitions from large to small diameter. Reduces fitting inventory and system complexity. Slip on and threaded per ASME specification.
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Orifice
Flow measurement and process instrumentation tapping. Small bore with integral flange face for differential pressure instruments. Engineered for measurement accuracy and long-term stability.
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Spectacle Blind
Isolation block with integrated blind and spacer ring. One side blank-off (blind), opposite side open (spacer). Dual-function design simplifies isolation and reduces installation time.
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Swivel
Rotating connection for installation flexibility. Spherical ball bearing interior allows 360° free rotation while maintaining seal. Ideal for difficult access or tight-tolerance applications.
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Ring Joint (RTJ)
Extreme pressure and temperature environments. Octagonal or oval ring gasket seated in precision groove. Superior sealing reliability for deepwater, cryogenic, and sour service applications.
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Tongue & Groove
Male tongue on one flange mates with female groove on mating flange. Provides mechanical alignment and improved gasket retention. Common in older systems and specialty applications.
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Male & Female
Convex and concave face pairing for gasket retention and self-alignment. Male flange pairs with female flange. Reduces gasket extrusion and improves joint security.
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Lapped
Custom face design with lap radius for specialized gasket seating. Engineered for low-pressure, low-leak applications. Requires precision machining and careful gasket specification.
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Weldolet
Branch connection on run pipe without isolated tee fitting. Olet body welded directly to main line; flange on outlet for instrumentation or branch connection. Space-saving design.
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Companion
Mating flange for lap joint stub ends. Integral bore and precision flatness. Works in pairs with stub ends to create modular, reusable piping sections.
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Expander
Expanding flange for large-diameter applications. Unique design allows field assembly and alignment. Simplifies installation in confined spaces and retrofit applications.
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AWWA C207 Flange
Water and wastewater service to AWWA standards. Large-diameter plate flanges for 4-inch through 144-inch pipe. Engineered for municipal utility piping systems and industrial water distribution.
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DIN EN 1092-1 Flange
European standard metric flanges. PN 6 through PN 400 pressure ratings. Complete range of PN ratings and face designs. ISO metric dimensions for cross-border supply chain compatibility.
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Standards & Compliance
Applicable Standards
ASME B16.5
Pipe Flanges and Flanged Fittings
NPS 1/2" through 24", Class 150 through 2500
ANSI
American National Standards Institute
ANSI B16 series for pipe components
DIN 2500–2640
German Industrial Standards
DIN metric flange and fitting series
AWWA
American Water Works Association
Water and wastewater utility standards
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