SECTION 380:25-5-40. Overpressure protection

  Each pressure vessel or pressure vessel system shall be provided with safety, relief, indicating, and controlling devices as necessary to protect against overpressure. These devices shall be so constructed, located, and installed that they cannot readily be rendered inoperative. The relieving capacity of such pressure relief devices shall be adequate to prevent a rise in pressure in the vessel or system of more than 10% above the highest pressure to which any pressure relieving device is set and in no case more than 16% above the maximum allowable working pressure. The opening pressure of the lowest set pressure relieving device shall be no greater than the maximum allowable working pressure of the vessel or system. Where an additional hazard is involved due to fire or other unexpected sources of external heat, the pressure relief devices shall meet the requirements of ASME Code Section VIII.