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wet return piping

but I have no idea how to assure that the temperatures will not be exceeded at some point.

Also, Sch. 40 PVC is not recommended for chem lab sinks but instead a type of polypropylene is usually specified. (Material is usually of a light blue or blue-green color, you have seen it.) Chemical resistance and thermal resistance are entirely different matters, besides.

I would not risk it, myself, for any permanent installation.

My $0.02


  • T. Riley
    T. Riley Member Posts: 26
    wet return piping

    Is there any reason why schedule 40 pvc could not be used for the section of wet return that never gets above 70 degrees? I see that it is used on chem lab sinks apparently with no long term problems. The coefficient of expansion and contraction being different than steel might be one reason. I can see that this might present some difficulty in coupling the two, but is there any other reason?

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