PVC piping shall be used only for its intended purpose and shall not be used for the transport of compressed air without the manufacturer's written approval unless completely enclosed in a conduit or casing of sufficient strength to provide protection from external damage and deterioration.
Minn. R. agency 151, ch. 5205, MAINTENANCE AND REPAIR OF BUILDINGS AND EQUIPMENT, pt. 5205.0720
Statutory Authority: MS s 182.655