Table 10-4.--The Evaporation Loss Rate Test
Step
Action
To start the test, ensure that the storage tank is filled to at least 50% capacity and that all valves are
closed.
1
Open the storage tank vent line shutoff valve (GV-6).
2
Allow the storage tank to remain undisturbed for about 12 hours.
3
At the end of 12 hours, weigh the unit on a platform scale. Record the weight of the unit, the date,
and the time.
4
Move the unit to a storage area, and position it on a level surface.
5
Allow the unit to remain undisturbed for a minimum of 24 hours.
6
Weigh the unit at the end of test period, and record the amount of loss.
7
Convert the weight loss to pounds per day (24 hours). The maximum weight loss should not exceed
17 pounds of LOX per day.
HINT: The math is easier if you weigh the unit right at 24 hours.
Table 10-5.--The Storage Tank Piping Test
Step
Action
To start the test, ensure the storage tank is filled to at least 50% capacity and all valves are closed.
1
Open the transfer tank fill line shutoff valve (LV-2) and the transfer tank vent line shutoff valve
(GV-3) to fill the transfer tank.
2
When the transfer tank is full, close the transfer tank fill line shutoff valve (LV-2).
3
Slowly open the transfer tank pressure buildup valve (GV-5) to build pressure in the storage and
transfer tanks.
4
When the storage tank pressure gauge (P-1) indicates 45 psig, close the transfer tank pressure
buildup valve (GV-5).
NOTE: You may have to manipulate the transfer tank pressure buildup valve (GV-5) to hold the
storage tank pressure steady at 45 psig during the test.
5
Use a brush to apply Leak Test Compound at all plumbing joints, gauge flanges, and other areas
where leaking is possible. Check the fill, pressure buildup, and vent valves for leakage.
6
After completing the test, empty the transfer tank by opening the storage tank vent shutoff valve
(GV-6), the transfer tank fill line shutoff valve (LV-2), and the transfer tank pressure buildup valve
(GV-5).
7
When the transfer tank liquid level gauge (LG-2) indicates that the transfer tank is empty, close the
transfer tank fill line shutoff valve (LV-2), and the transfer tank pressure buildup valve (GV-5).
Leave the storage tank vent shutoff valve (GV-6) open.
malfunction and that you can relate it to a system
NOTE: The troubleshooting charts presented in
schematic. Your objective should be to expose the LOX
this training manual are only examples and are not
cart to the risk of contamination for as short a time as
necessarily complete. Before attempting repairs on
possible.
any item of equipment, consult the applicable
10-15
