What frequency of inspections of manufacturing plants is required by the ES PMG listing program?
Each manufacturing location will undergo an initial qualifying inspection in addition to a surveillance inspection which will be conducted at least once a year. However, manufacturing locations of pressure plastic pipes and tubing are inspected three times annually (Exception: Flexible water connectors, covered under ASME A112.18.6, are not included in this category); manufacturing locations of drain, waste, and vent (DWV) pipes are inspected twice a year.
