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What does “DR” designate?

April 26, 2017designate

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What does “DR” designate?

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“DR” stand for “dimensional ratio.” The dimensional ratio is the nominal outside diameter of the pipe divided by the wall thickness of the pipe. It is used to determine the pressure rating of the pipe. Since the DR is an indicator of wall thickness, it can also be used to determine the proper interfacial force required to properly fuse a pipe. “SDR” stands for “standard dimensional ratio,” and refers to standardized dimensional ratios as referenced in certain ASTM standards. back to top 10. What is the “interfacial pressure?” Interfacial pressure is the force, in lbs. per square inch, required to fuse a polyethylene pipe. This number is used in a calculation with the surface area of the pipe end to determine the total fusion force required to fuse a given pipe. The gauge pressure that is used on a fusion machine is determined by a calculation utilizing total force and the cylinder area of the fusion machine.