Class 150 Forged Carbon Steel Blind, Flat-Face Flange
Class 150 ASTM A105 / ASME SA-105 Blind Flange
The Class 150 ASTM A105 / ASME SA-105 Forged Carbon Steel Blind Flat-Face Flange provides a strong, removable method for closing and isolating industrial piping systems. Unlike flanges designed for continuous flow, a blind flange has no center bore, allowing it to securely terminate a pipeline, valve connection, pressure vessel opening, or unused piping branch.
ASTM A105 / ASME SA-105 Forged Carbon Steel
Manufactured from ASTM A105 / ASME SA-105 forged carbon steel, this blind flange provides excellent mechanical strength, durability, and dependable performance in pressure-containing applications. A105/SA-105 carbon steel is commonly specified for forged steel flanges, fittings, valves, and industrial pressure piping components.
The Class 150 designation represents the flange's ASME pressure class rather than a maximum operating pressure of 150 PSI. Actual allowable pressure depends on material, temperature, and applicable pressure-temperature ratings.
Carbon Steel Blind Flange Applications
A Class 150 carbon steel blind flange is bolted to a compatible mating flange to stop flow and provide positive piping system closure. Because the flange can be removed, it provides convenient access for future system expansion, inspection, maintenance, cleaning, or equipment modifications.
Flat-Face Flange Design
The flat-face (FF) flange has a gasket seating surface extending across the entire flange face without the elevated sealing area found on a raised-face flange. Flat-face designs are typically selected when mating with compatible flat-face flanges, valves, pumps, or equipment.
Class 150 A105/SA-105 blind flanges may be manufactured according to ASME B16.5 requirements for applicable sizes, including flange dimensions, facing, bolt patterns, tolerances, and pressure-temperature ratings.
For industrial contractors, fabricators, utilities, and maintenance operations, the Class 150 A105/SA-105 forged carbon steel flat-face blind flange provides a durable, serviceable solution for securely terminating and isolating industrial piping systems.