Weld Neck Flanges have a long tapered hub & are often used for high pressure applications. These flanges are designed to be joined to a Piping system by Butt Welding. The Neck, or Hub transmits stresses to the Pipe, reducing stress concentrations at the base of Flange. The gradual transition of thickness from the base of Hub to the wall thickness at Butt Weld, provides important reinforcement of the Flange. The bore of Flange matches the bore of Pipe, reducing turbulence & erosion. These flanges are ideal for extreme fluctuations of temperature & in environments where there may be high temperature.
Slip On Flanges are easily fitted & welded into different pipes. Slip on pipe Flange is slipped over the Pipe & then welded both inside & outside to provide sufficient strength & prevent leakage. These flanges are ideal for lower pressure applications. This Flange is used in preference to Weld Necks by many users because of its lower cost & the fact that less accuracy is required when cutting pipe to length
Lap Joint Flanges slide over the pipe & are most commonly used with Stub End Fittings.
A pipe is typically welded to the Stub End & the Lap Joint pipe flange is free to rotate around the stub end. Lap Joint pipe flanges are often used for applications that require frequent dismantling. Threaded pipe flanges are often used for small diameter, high pressure
requirements.
Orifice Flanges are used instead of standard pipe flanges when an orifice plate or flow nozzle
must be installed. Pairs of pressure tappings are machined into the orifice flange,
making seperate orifice carriers or tappings in the pipe wall necessary.