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A threaded flange connects pipes without welds, using a tapered thread to create a leak-proof joint. It is used in areas where welding is not feasible, such as in highly explosive environments, and is commonly used on smaller diameter pipes. It is suitable for high pressure and high temperature pipelines and is often used in food preparation areas and with stainless steel piping. A sealing weld may be used for added security.
A threaded flange is a connecting device that can be attached to a pipe run without welds. By using a taper thread, the threaded flange is tightened onto the pipe without leaking, however, where appropriate, a sealing weld is commonly used. The nature of the threaded connection makes the threaded flange a viable option when welding is not feasible, such as in highly flammable or explosive areas. This flange is commonly used on smaller diameter pipes only.
In many refineries, manufacturing plants and shipyards, the highly explosive nature of materials moved through pipelines prohibits welding. In this type of environment, the threaded flange is often a good choice when assembling pipelines. Using a tapered thread on the inside of the flange, the pipe is tapered on the outside and threaded into the threaded flange. When the two cones fit together, the flange joint becomes tight and leak-proof. If conditions exist which make the weld safe, a sealing weld is occasionally placed around the joint of the pipe and flange.
The threaded flange is typically found on smaller diameter pipes, as it is difficult to machine accurate threads in large diameter applications. This type of connection is particularly suitable for use on high pressure and high temperature pipelines. The heat expands the pipe in the flange, making the seal even more hermetic. When assembled before flammable liquids have flowed through the pipe, a sealing weld is occasionally placed at the pipe and flange joint to ensure a leak-proof connection. Unlike a flange weld, gasket welding is only used to eliminate the possibility of a leak developing and is not critical to the strength of the joint.
One of the many areas where a threaded flange is used is food preparation areas and any location where stainless steel piping is used. Stainless steel is often difficult to make with an aesthetically pleasing weld, so the use of threaded connectors, flanges and couplings is routine when assembling this type of tubing. This type of flange is commonly used to create a joint that will withstand the typical collar clamp placed across two joining flat flanges. Steam lines often use the threaded pipe and flange to withstand the enormous pressures that can be generated within a steam line. In high volume pipelines, the threaded flange reduces the chances of a misaligned flange and pipe creating disruptive turbulence within the pipeline.
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