Section 215.255  Liquid Level Gauging Devices

a)         Gauging devices shall be arranged so that the maximum liquid level to which the container may be filled is readily determinable.

b)         Gauging devices shall have a design working pressure at least equal to the design pressure of the container on which they are used.

c)         Tube type liquid level gauging devices on containers in excess of 3,000 gallons shall be equipped with shutoff valves at the lower connection.