1305.14.1.7 Manholes.
MC § 1305.14.1.7
Tanks for No. 1, No. 2, No. 3 and No. 4 commercial grade oils need not have manholes. However, if manholes are used for tanks containing such oils, the manhole covers shall be bolted and made gas tight. Tanks for No. 5 and No. 6 commercial grade oils shall have manhole covers bolted or otherwise secured to the tanks and kept hydrostatically tight at all times. Tanks 330 gallons (1249.2 L) capacity or less, and all other tanks without manholes, shall be provided with a two screwed connection on the top of the tank to permit measuring the level of the oil within.













