UFC 3-460-03
21 JANUARY 2003
6.6.3.2. During the fueling operation, the operator must continuously verify the operating tank fuel
level to ensure the tank does not drop below the tank low level. Verify by checking the liquid
level gauge at the tank.
6.6.4. Night Shutdown. At some locations, it is common practice to shut down the system at night.
This may cause the system pressure to drop into the vacuum range, especially during hot weather
where warm fuel cools in underground piping. Air can get into the system through hydrant pit valves
and the HSV check-out stand valves. This can be prevented by leaving the system on or by using
airtight covers on the valves.
6.7. Leak Detection. A rapid method of checking for leaks in the hydrant system is to leave the system
in the automatic idle mode and count the number of times it must be re-pressurized in a given period of
time. Experience will tell how many times is too many. Such a problem could indicate an internal leak
through a system automatic or manual valve, pressure relief, air eliminator, or drain line, or an external
leak through the system piping or components.
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