Flange Types
Flange Connector
How flanges create bolted connections in piping systems.
A flange connector is a bolted joint assembly consisting of two mating flanges, a gasket, and a set of bolts and nuts. This assembly creates a pressure-tight, demountable connection between pipes, valves, pumps, heat exchangers, and other equipment in a piping system. The ability to disassemble and reassemble flanged connections is a primary advantage over welded joints.
The gasket is compressed between the flange faces by the bolt load to create the seal. Gasket selection depends on the process fluid, pressure, temperature, and flange facing type. Common gasket materials include spiral wound (stainless steel and graphite filler), compressed sheet (non-asbestos fiber), and solid metal rings for RTJ flanges. Each flange facing type (raised face, flat face, ring type joint) requires a specific gasket style.
Achieving a leak-free joint requires proper bolt tightening using a star pattern in multiple passes to ensure uniform gasket compression. Bolt torque values depend on the bolt size, material, lubrication, and required gasket stress. Flanges.IO can provide gasket and bolting recommendations for your specific application. Contact our engineering team for technical support.
