Industrial Pipe Flanges: Weld Neck, Slip-On and Blind Flange Selection Guide
Industrial pipe flanges are used to connect pipelines, valves, pumps, pressure vessels and equipment. Buyers often search for pipe flange supplier, weld neck flange, slip-on flange, blind flange, ASME B16.5 flange and carbon steel flange manufacturer when selecting components for piping projects.
Weld neck flange
Weld neck flanges are suitable for higher pressure and temperature applications. The tapered hub helps transfer stress and provides reliable performance in demanding piping systems.
Slip-on flange
Slip-on flanges are widely used for general industrial piping because they are easy to install and align. They are commonly used in water treatment, process piping and low to medium pressure systems.
Blind flange
Blind flanges close the end of a piping system, valve or pressure vessel opening. They are useful for maintenance, inspection and future expansion points.
Common standards and materials
Flanges are commonly supplied according to ASME B16.5, ASME B16.47, EN 1092, DIN, JIS and other project standards. Common materials include ASTM A105 carbon steel, stainless steel 304/316/316L and alloy steel grades.
Selection checklist
- Flange type: weld neck, slip-on, blind, socket weld or threaded
- Nominal pipe size and pressure class
- Facing type such as RF, FF or RTJ
- Material grade and heat treatment
- Bolt hole standard and gasket compatibility
- Surface treatment and inspection documents
Pipe fitting package support
Flanges are often supplied together with elbows, tees and reducers for full piping packages. See the main pipe fittings guide: https://pipingfitting.com/carbon-steel-and-stainless-steel-pipe-fittings-manufacturer/
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Further Reading
You may also find these guides helpful:
Weld Neck vs Slip-On vs Lap Joint – Cost & Strength
Weld neck costs the most (forged hub, butt weld preparation) but delivers pipe-strength joints – the only choice for severe cyclic and high-pressure service. Slip-on costs less, aligns easily, and its two fillet welds suit most utility and moderate process lines. Lap joint + stub end shifts cost out of the flange entirely – ideal on stainless lines where the rotating carbon-steel backing flange saves the difference. Match the type to service criticality, not habit.
Blinds, Line Blanks and Special Types
Terminating a line: blind flange. Isolating for maintenance: spectacle blind (rotating) or spade/paddle blind (inserted plate) per ASME B16.48. High-pressure terminations: RTJ blinds. Gauge/drain points on blanks: tapped blinds. Low-pressure utilities: plate flanges cut from certified plate.
FAQs
How many bolt torque passes? Three to four in a star pattern, up to the specified torque, re-checked after first heat-up on steam lines.
Which facing is standard? Raised face (RF) for almost all process piping; FF for cast-iron equipment; RTJ for class 900+.