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Originally Posted by FrankJ
But then it would not be the commonly available PVC that the warning applies to.
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That's just the thing: apparently some state OSHA offices prohibited PVC pipe outright (e.g. Arizona, from which the quotation at issue was sourced) without specifying whether they were only talking about the conventional PVC water pipe. Unless they are confident that no safer PVC pipe can be made, they should only restrict the specific products that pose the hazard.
Quote:
Originally Posted by FrankJ
The warning also allows covering the PVC with a shatter proof material covering it. That would be an engineered solution I suppose.
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Exactly: that better-engineered solution conflicts with the prohibitions described by the Arizona, Washington and possibly Nevada OSHA offices. The main OSHA memorandum is better, because it recognizes appropriate ways to use the pipe.