Class 900 Forged Carbon Steel Slip On, Raised-Face Flange
Class 900 A105N Forged Carbon Steel Slip-On Raised-Face Flange
The Class 900 ASME A105N Normalized Forged Carbon Steel Slip-On Raised-Face Flange manufactured to ASME B16.5 provides a heavy-duty connection for demanding industrial pressure piping systems. Combining normalized forged carbon steel construction, convenient slip-on installation, and a raised-face sealing surface, this flange delivers strength, durability, and reliable performance in high-pressure applications.
ASME A105N Normalized Forged Carbon Steel
Manufactured from ASME SA-105N / ASTM A105N forged carbon steel, this Class 900 slip-on flange undergoes a normalizing heat treatment that refines the steel grain structure and helps provide consistent mechanical properties. The “N” designation identifies the A105 carbon steel material as normalized.
A105N forged steel flanges are commonly specified for oil and gas, petroleum refining, petrochemical processing, chemical plants, power generation, manufacturing, utilities, and industrial process piping systems.
Class 900 Slip-On Flange Design
A slip-on flange has a machined bore that allows the flange to slide over the outside diameter of the connecting pipe. The pipe is positioned according to applicable fabrication requirements and secured by fillet welding.
Slip-on construction can simplify positioning and alignment during piping fabrication while providing a permanent welded connection.
The Class 900 designation represents 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) design incorporates an elevated gasket seating area that concentrates bolting load over the gasket, helping create a dependable seal between compatible mating flanges.
ASME B16.5 Flange Requirements
ASME B16.5 establishes applicable flange dimensions, facing requirements, bolt patterns, tolerances, and pressure-temperature ratings.
When ordering a Class 900 A105N slip-on raised-face flange, verify nominal pipe size, Class 900 rating, A105N normalized material, bore dimensions, raised-face configuration, ASME B16.5 requirements, gasket selection, bolting, welding requirements, and service conditions.