1305.8.4 Capacity.
MC § 1305.8.4
The total relief venting capacity of the combination normal and emergency relief venting shall be in accordance with Section 22.7 of NFPA 30. Construction documents shall include calculations demonstrating that the extension of the normal and emergency vent piping is adequately sized to provide the required emergency vent flow while limiting the backpressure to less than the maximum pressure permitted by the design of the tank. Additionally, consistent with Section 27.7.3.4 of NFPA 30, where the design provides for a reduction in the required emergency relief venting capacity based upon the properties of the fuel oil to be stored in the tank, the construction documents shall include supporting calculations.
