- (a) Each container, except containers covered by United States Department of Transportation regulations, shall be equipped with a liquid level gauging device of approved design.
- (b) All gauging devices shall be arranged so that the maximum liquid level to which the container may be filled is readily determinable.
(c)
- (1) Gauging devices that require bleeding of the product to the atmosphere, such as the rotary tube, fixed tube, and slip tube, shall be so designed that the bleed valve maximum opening is not larger than a No. 54 drill size, unless provided with an excess flow valve.
- (2) Exception. Applicator tank may have bleed valve not more than five-sixteenths inch (5/16”) in diameter.
- (d) Gauging devices shall have a design working pressure of at least two hundred fifty pounds per square inch gauge (250 psig).
(e)
- (1) Fixed liquid level gauges shall be so designed that the maximum volume of the container filled by liquid shall not exceed eighty-five percent (85%) of its water capacity.
- (2) The coupling into which the fixed liquid level gauge is threaded must be placed at the eighty-five percent (85%) level of the container.
- (3) If located elsewhere, the dip tube of this gauge must be installed in such a manner that it cannot be readily removed.
(f)
- (1) Gauge glasses of the columnar type shall be restricted to bulk storage installations.
- (2) They shall be equipped with valves having metallic handwheels, with excess flow valves, and with extra heavy glass adequately protected with a metal housing applied by the gauge manufacturer.
- (3) They shall be shielded against the direct rays of the sun.