Geoff, my point was that if the piping is slowly deforming under load, that might make the idea of "cold spring" fairly moot (which would explain not being able to use it per code)
-Shannon
> Hi Shannon,
>
> Yes plastics will slowly deform under load. When the
> load is released a reversal of load occurs. All
> supports for a plastic pipe sysem must be designed
> to withstand positive and negative loads. Because of
> the high rate of movement with plastics and ther low
> strength it is best to just guide them. nless
> restrained there will only be low stresses. The
> support design has to be such that elastic follow up
> does not occur and fatigue loading , particularly
> with stress reversal, is avoided.
>
> Geoff
>
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