Ring Type Joint Flange is a method of ensuring leak proof flange connection at high pressures.
A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal. This jointing method can be employed on Weld Neck, Slip-on and Blind Flange.
Standards, Dimensions & Weight
- Dimensions of Ring Joint Facings
- Ring Joint Facings ASME/ANSI B16.5 & B16.47-1
- Ring Joint Facings ASME/ANSI B16.5 & B16.47-2
- Ring Joint Facings ASME/ANSI B16.5 & B16.47-3
- Ring Joint Facings ASME/ANSI B16.5 & B16.47-4
RTJ flanges have grooves cut into their faces which accept steel Ring Gaskets. RTJ flanges seal when tightened bolts compress the gasket between the flanges into the grooves, deforming (or “Coining”) the gasket to make Intimate Contact inside the grooves, creating a metal to metal seal.
An RTJ flange may have a raised face with a ring groove machined into it. This raised face does not serve as any part of the sealing means. For RTJ flanges that seal with BX ring gaskets, the raised faces of the connected and tightened flanges may contact each other. In this case the already coined gasket will not bear additional load beyond the bolt tension, vibration and movement cannot further crush the gasket and lessen the connecting tension.
Specifications of Ring Type Joint Flange:
Size: 1/2” to 60”, DN 12mm to DN 1500mm
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ>
Cabon steel: A105, A350 LF2
Stainless steel: A182 F304/F304L/F316/F316L/F321
Alloy steel: F11, F12
Packing: plywood case and plywood pallet