Transcription of Dimension Ratio (DR) Explained for PVC Pipe - Uni-Bell
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Dimension Ratio (DR) Explained for PVC Pipe - Uni-Bell
Dimension Ratio (DR) Explained FOR PVC PIPED imension Ratio is an important but often misunderstood concept for PVC pipe . Some of the confusion arises because of the use of both Dimension Ratio (DR) and Standard Dimension Ratio (SDR) in product standards. Mathematically, the concepts are simple: 1. For practical purposes, DR = SDR. DR = SDR = OD/t 2. DR = SDR = the specified outside diameter of the pipe (OD) divided by the specified minimum wall thickness (t). WHAT IS STANDARD Dimension Ratio ?
pipe size. • DR for PVC Pipe Designed for Internal Pressure For PVC pressure pipe, a product with a particular hydrostatic strength and DR will have the same Pressure Class (PC) or Pressure Rating (PR) no matter what the size. For example: 1. AWWA C900 – DR18 pipe has a PC of 235 psi for the 4-inch size through the 60-inch size. 2.
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