The American Society of Mechanical Engineers (ASME) sets manufacturing standards for flange shape, weight, material, and size. The pipe size affects the dimensions of each part of the flange, including the diameter of the flange, raised face, bore, hub, bolt, and bolt circle. Standards also exist for flange thickness, the length of the hub, and a number of bolt holes. The standards help ensure a proper fit in the pipe application, which is a mandatory part of the requirements.
High pressure builds when connection pipes bend or travel in different directions. Proper connection forging of long weld neck flanges adds strength to the pipes to compensate for the pressure. FCI actively monitors its manufacturing processes for quality assurance because of the important part its products play in safe operations and public safety.