DHFF / DHWW Double Hinged
Two metal bellows elements connected by a pipe centre spool fitted with flanges or pipe weld ends, with hinge plates and pins to contain pressure thrust forces on a piping system.
This joint is virtually two single HFF joints connected by a factory fitted pipe piece thereby reducing the system weight by involving two flanges instead of four, and assisting in installation by not having to provide the spool piece on site.
Suitable for large lateral offset movements in a single plane only with minimal reaction forces.
Manufactured to the guidelines laid down in the Standards of the Expansion Joint Manufacturers Association Inc. (EJMA).
Pressure Rating – standard joints
4, 10 and 20 bars – subject to pressure capability of attached hardware.
Bore Size Range – standard
50 – 1500mm
Type DHFF – flanges both ends
Type DHWW – pipe weld ends both ends
Type DHFW – flange one end, weld end the other
Pipework System Notes
Hinge hardware is attached to contain pressure thrust forces, and in many cases could support the dead weight of the
Heavy expensive main anchors are usually not necessary and only minimal guiding is required.
RADCOFLEX recommends you consult your pipework engineer on pipework design and expansion joint selection.
Full technical specification booklets are available from RADCOFLEX to assist.