UFC 3-460-03
21 JANUARY 2003
Figure 9.3. Typical Method of Bonding Ladders on Floating Roof Tanks.
9.5.2. Pier Facilities. Before starting unloading operations from a barge or tanker, and before hose
connections are made, securely bolt the ground wire on the dock to a clean, paint-free surface on the
discharge line of the ship.
9.5.2.1. After this ground has been established, close the switch on the dock, completing the
circuit. Maintain the circuit until offloading has been completed and hoses have been
disconnected. See Figure 9.2. for typical grounding and bonding procedures. When the existing
number 4 AWG copper (stranded cable) or copper alligator clamps need replacing, use
2.3-millimeter
(0.09-inch)
corrosion-resistant,
plastic-covered
steel
cables
(NSN 4010-00-286-2681 and MS 27610 Clip, Electrical Ground, NSN 5999-00-94-5844,
respectively).
9.5.2.2. Periodically check all ground-connection cables, switches, and bonding jumpers for
contact condition and tightness, as specified in paragraph 10.23.
9.5.3. Tank Car Loading and Unloading Facilities. When a tank car is being loaded, securely attach
the grounding cable to a clean connection on the car before opening any valve or dome cover, or
connecting the fuel hose. There is no requirement to connect a grounding cable between the tank car
and stand or fuel line header during unloading operations because adequate grounding is provided to
the rails without the use of the grounding cable.
9.5.4. Truck Fill Stand and Unloading Facilities. Under some atmospheric conditions, a truck in
motion builds up a considerable charge of static electricity. Attach the grounding cable before
opening the fill hatch or outlet valve or connecting the fuel hose. Figure 9.4 shows a typical bonding
cable system and grounding details. Ground rod B is near the base of the fill stand. As soon as
loading or unloading operations are completed and the fuel hose is detached from the vehicle,
disconnect the ground conductor. Make periodic inspections to ensure tight bonding and good
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