4.12.715 LIQUID LEVEL GAUGING DEVICES
(1) Each container, except containers filled
by weight, shall be equipped with a liquid level gauging device of approved
(2) All gauging devices shall be arranged so
that the maximum liquid level to which the container may be filled is readily
(3) 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 the device is equipped with an excess flow valve.
(4) Gauging devices shall have a design working
pressure at least equal to the design pressure of the storage tank on which
they are used.
(5) Fixed liquid level gauges shall be so
designed that the maximum volume of the container filled by liquid shall not
exceed 85 percent of its water capacity. The coupling into which the fixed
liquid level gauge is threaded must be placed at the 85 percent level of the
container. If located elsewhere, the dip tube of this gauge must be installed
in such a manner that it cannot be readily removed. This does not apply to
refrigerated storage of
History: Sec. 80-10-503, MCA; IMP, Sec. 80-10-503, MCA; NEW, 1986 MAR p. 1820, Eff. 10/31/86.