Class 900 Forged Carbon Steel Blind, Raised-Face Flange
Class 900 A105N Forged Carbon Steel Blind Raised-Face Flange
The Class 900 A105N Normalized Forged Carbon Steel Blind Raised-Face Flange manufactured to ASME B16.5 provides a strong, reliable solution for closing high-pressure industrial piping systems, pressure vessel nozzles, valve connections, and unused flanged openings. Its solid forged construction, normalized heat treatment, and raised-face design make it well suited for demanding process piping applications.
ASTM A105N Normalized Forged Carbon Steel
Manufactured from ASTM A105N forged carbon steel, this blind flange undergoes a normalizing heat treatment that refines the steel’s grain structure and helps provide consistent mechanical properties. The “N” designation identifies the material as normalized A105 carbon steel.
A105N forged steel flanges are commonly specified for oil and gas, petroleum refining, petrochemical processing, chemical plants, power generation, manufacturing, and high-pressure industrial piping systems.
Class 900 Blind Flange Design
A blind flange has no center bore and is designed to close or isolate the end of a flanged piping connection. Its solid construction provides a secure pressure boundary while retaining the advantages of a removable bolted connection.
Class 900 blind flanges provide convenient access for pressure testing, inspection, maintenance, cleaning, system isolation, piping modifications, and future system expansion.
The Class 900 designation is an ASME pressure class, not a maximum working pressure of 900 PSI. Actual allowable pressure depends on material, flange size, operating temperature, and applicable pressure-temperature ratings.
Raised-Face Flange Construction
The raised-face (RF) flange incorporates an elevated gasket seating area. Concentrating the bolting load over this smaller gasket area helps establish a dependable seal with a compatible mating flange and properly selected gasket.
ASME B16.5 Flange Requirements
Manufactured to applicable ASME B16.5 requirements, Class 900 A105N blind flanges provide standardized dimensions, facing requirements, bolt patterns, tolerances, and pressure-temperature ratings.
When ordering, verify nominal pipe size, Class 900 rating, A105N normalized material, blind configuration, raised face, ASME B16.5 requirements, gasket selection, bolting, and operating conditions.