R 408.15739 Pressure equipment.

Rule 5739. (1) A relief valve discharge shall be located and anchored so as to prevent a hazardous condition due to sudden discharge or piping movement. (2) In normal operation, pumps, piping, hoses, valves, and other fittings shall not be operated at pressures greater than their rated working pressure and shall be maintained in good operating condition. Test pressures shall not exceed the design test pressure. Pumps, piping, hoses, and safety relief valves shall be of the design that meets the requirements of the operating conditions to be encountered. (3) Repairs to electrically driven pressure equipment shall not be performed unless the energy source has been interrupted at the switch box and the control has been locked.