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INDUSTRY, LABOR AND HUMAN RELATIONS 45 Ind 8 (c) Emergency internal calves. 1. An emergency internal valve at each piping connection to any tank below the normal liquid level shall be provided in addition to any normal valves. 2.The valve shall be effective inside the tank shell and shall be oper- ated both manually and by a heat actuated device,which will automati- cally close the valve in case of fire to prevent the flow of liquid from the tank,even though the pipelines are broken from the tank. 3.These valves shall be inspected and manually operated annually by the owner or operator. 4. Emergency internal valves shall not be required on the following: a. Crude or residential tanks. • b.Tanks at refineries or tanks at terminals which are equipped with a swing line or where facilities are provided to transfer the contents of the tank to another tank in case of fire. c. Tank openings with less than nominal 3/4 inch inside diameter. d.On tanks installed prior to the effective date of this paragraph if the size of the opening makes it impractical to use an internal valve.In these cases,an external valve shall be used,provided the valve incorporates a shear section and is so installed that any undue strain beyond the valve will not cause failure between the valve and the tank.Any enlargement of opening in tank will require installation of an internal valve. (d) Combination calves. The use of one valve to fulfill the require- ments of par. (b) or (c) shall be permissible provided the combination valve affords manual control equivalent to that of the external valve and provides effective closure inside the tank shell when the heat actuated control device functions. (e) Closure of openings. 1. Each connection below the liquid level through which liquid does not normally flow shall be provided with liq- uid-tight closure.This may be a valve,plug or blind,or a combination of these. 2. Openings for gauging shall be provided with a vapor tight cap or cover. (f) Nonstatic electricity generating fill pipes.For Class IA,IB and IC liquids other than crude oils and asphalts, the fill pipe shall be so designed and installed as to minimize the possibility of generating static electricity.A fill pipe entering the top of a tank shall terminate within 6 inches of the bottom of the tank and shall be installed to avoid excessive vibration. • • (g) 1.Filling and emptying connections for Class I,Class II and Class IIIA liquids which are made and broken shall be located outside of buildings at a location free from any source of ignition and not less than 5 feet away from any building opening. 2. Such connections for any liquid shall be closed and liquid-tight when not in use and shall be properly identified. History:Cr. Register,March, 1982,No.315,eff.4-1-82. Register,March,1982,No.315