Threaded steel pipe is convenient for plumbers and contractors since it eliminates the need to weld sections of pipes together. However, to ensure the connections are sealed properly, installers should adhere to the torque specifications of the particular pipe. The maximum, recommended and minimum pipe torque is determined through various specification organizations and can also be dependent on the application for which the pipe is used.
A threaded pipe fitting should adhere to at least one universal specification body. These organizations include the American Society for Testing and Materials (ASTM), the Society of Automotive Engineers (SAE) and the American National Standards Institute (ANSI). Other, smaller organizations also exist, as well as international organizations.
Torque, in the most general of terms, is the measurement of a turning force on an object ,such as the amount of force it takes to screw a screw or threaded pipe together. The units of measurement vary but the classical measurements are distance, divided by the change in time, multiplied by mass and velocity. The metric measurement of torque uses newton meters. Joule per radian, foot pounds and meter-kilogram-force are also used.
Pipe fittings vary depending on the application. Generally, higher pressure pipes have higher recommended and maximum torque measurements. Some of the most common threaded pipe torques are 2,000 pound, 3,000 pound and 6,000 pound threaded pipes. However, threaded pipe torque specifications may be as low as 150 pounds depending on the material and application.
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