The aquatherm piping systems are based on standard dimension ratio, or SDR. This means that for a given SDR, all pipe sizes will maintain the same ratio of OD to wall thickness. The benefit of this is that all pipe sizes of a given SDR have the same pressure rating. This is different than steel and copper which have different pressure ratings for different sizes of the same schedule, where the pressure rating decreases with larger sizes.
For those more accustomed to metal pipe, the different SDR’s of aquatherm pipe can be thought of as different schedules or types. The wall thickness on SDR 7.4 will be more comparable to schedule 80, while SDR 11 is closer to schedule 40.
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