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Minimum pipe stiffness (f/ y) at 5% deflection shall be 46 psi for sdR 35 and 115 psi for sdR 26 for all sizes when tested in ance with astM d2412, external loading properties of plastic pipe by parallel-plate loading.
The key difference between them is that DR is used for any number, while SDR is used for a particular series of numbers ( 17, 11, 9, 7, etc.) This series is based on a geometric progression pattern and was developed by Charles Renard, a French engineer.
The quick answer is flexibility. Mother nature is always shifting and settling. Since these lines are installed underground, they will be subject to these changes. Here is where the flexibility of SDR 35 outweighs the strength of Schedule 40.
4 SDR 35 pipes are most commonly used in sewer and drain applications and agricultural purposes. They are also sometimes used in irrigation systems. 4 SDR 35 pipes are available in various lengths and diameters, and they can be cut to size with a saw if necessary.
Pipe stiffness must be at least 320 kPa (46 psi) for DR35, and 625 kPa (90 psi) for DR28. DR35 and DR28 are compressed between two parallel plates to a deflection of 40%, ing to ASTM D2412, in compliance with CSA B182.
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