SECTION V
5.0
GAUGING TAPE OPERATION:
5.1
TANK ENTRY:
5.1.1. The closed tape is installed into a vapor control valve in the same was as a
restricted Flexi-Dip model. However, since the closed unit is sealed, an air
cushion may occur, preventing the “Closed” tape from easily seating into the
valve. BY depressing the vacuum/pressure relief valve located on the top of the
“closed” unit, the back pressure is release, allowing the unit to properly seat. The
securing collar on the storage tube barrel is then tightened on the valve.
5.1.2 In addition, the vacuum/pressure relief valve can be used to determine the
pressure within the case. Unscrewing the valve actuator cap exposes the actual
valve. This valve is similar to an ordinary bicycle tire valve and has its own
attached to the valve by means of the exposed threaded valve stem. After pressure
readings are complete, screw that valve actuator cap back onto the valve.
5.2
PRODUCT GAUGING OPERATION:
5.2.1 The tape sensor, lowered and raised by unwinding and rewinding the tape
crank/reel lock assembly, is located on the reel driving hub, which is spring-
loaded (perpendicular to the hub faceplate), the sensor can be freely lowered by
turning the reel hub clockwise
To lock the reel at a desired tank depth, pull the knurled knob up and out of its
hub socket and rotate it downward against the case. The reel is not locked. To
unlock the reel, reverse the above procedure.
5.3
DETERMINING CARGO LIQUID LEVEL:
Upon sonically determining the liquid level, (previously described), the gauging tape
scale is read through the primary gauging sight port, located on the bottom side of the
gauging assembly directly above the tape wiper housing. With a vapor valve properly
installed, the tape reading will be corrected to the “zero” ullage reference pane.
After completing a reading, re-wind the tape to its stowed position, being careful to
engage the spring-loaded tape wiper.
5.4
USE OF THE SECONDARY TAPE SIGHT PORT:
5.4.1 A secondary tape sight port is provided for two main purposes. This port is
located at the top of the unit, just below the carrying handle. With the carrying
handle rotated to the case cover side, the secondary port may be viewed directly.
5.4.2 When lowering or raising the tape, the motion of the gauging tape should be
observed through the secondary port. Viewing the tape through the secondary port
gives the operator an immediate sense of tape direction, and approximate pay-out
location of the sensor. When using a closed unity, as opposed to a restricted or
open mode, a sense of tape direction may not be obvious to new operators.
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