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Publisher Summary Flanges are primarily used where a connecting or dismantling joint is needed. These joints may include attaching a pipe to fittings, valves, mechanical equipment, or any other integral component within a piping configuration. Rating, as applied to flanges, may best be defined as the maximum pressure allowed by the pressure piping code for the specific temperature at which the flange will be operating. Flanges and nozzles are sized according to pressure ratings established by the American Society of Mechanical Engineers. These pressure ratings, often called pound ratings, are divided into seven categories for forged steel flanges. Pound ratings, when combined with the temperature of the commodity within the pipe, are used to select the appropriate size, rating, and type of flange. This pressure/temperature relationship allows any given flange to be used in a number of different applications. When temperature decreases, the allowable pressure increases, and vice versa. Pound ratings are also used to establish the outside diameter and thickness of a flange. Typically, as pound ratings increase, so will the flange's diameter and thickness. |
