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TM 10-4930-229-12&P
(a) Method 1: equipment is grounded to a rod or rods that have measured resistance to ground
equal to or less than 10,000 ohms. Ground the refueling system to this tested ground rod.
Bond the nozzle to the vehicle/aircraft (see paragraph 2-12b). This method Is required,
unless conditions, as described below, prevent its use. This method is the only standard of
grounding acceptable, without authorization, at any fixed airfield or refueling point. It is the
safest method.
(b)
Method 2: if equipment is not available to test resistance to ground, use method 2. Method 2
uses an untested ground - a grounding system based on the knowledge that damp earth will
accept and drain off an electrical charge. Use method 2 when the location, tactical situation, or
type of operation makes it impossible to test ground rods. Ground equipment to a rod or rods
driven a specific depth into the ground depending on the type of soil at the site (see table 2-2).
The depth to which the rods must be driven is determined by the normal depth of permanent
ground moisture in the various types of soils. The commander of the operating unit must
authorize the use of method 2. This method is less desirable. Employ method 2 when
impossible to use method 1.
WARNING
Death or serious injury may occur if proper bonding procedures are not followed (see
paragraph 2-12b). While using method 3, an obect with a different electrical potential
(any object that is not part of the bonded system) should not come into contact with
the bonded equipment when a flammable vapor-air mixture maybe present.
(c)
Method 3: When the climate, terrain, or tactical condition makes it impossible to secure a
satisfactory ground rod, requirements to ground the fuel dispenser (system or refueler) maybe
waived; however, the requirement to bond the fuel dispenser to the aircraft/vehicle may
not be waived under any circumstances. Method 3 relies on bonding alone (see paragraph
2-12b ). Bonding is made between the aircraft/vehicle and the refueling system or refueler
along with the nozzle and the aircraft/vehicle. A contact between an unbended object and the
system could produce a spark that could set off an explosion or fire. Method 3 procedures are
authorized by the commander of the unit one organizational level above the operating unit.
This is the least desirable method since it involves bonding only.
2-12. Operating Procedures.
a. Refueling Operations.
(1) Perform necessary Before PMCS (see table 2-1).
(2) Fill fuel tank on pump assembly with 5 gallons (18.925 liters) of approved fuel.
CAUTION
Do not start engine with pump housing dry. Do not operate over 2 minutes without
having fuel flow from the equipment.
(3) Prime pump by removing plug from priming port (see figure 1-2) and filling the housing with fuel.
Open elbow coupler valve (figure 2-1) on the fuel storage drum and butterfly valve (figure 2-2)
before starting engine.
(4) Open vent valve on filter/separator before starting the system (see figure 2-3).
CAUTION
if filter/separator should tip over during operation, stop pumping operation
immediately. Set the assembly upright and drain. Check connections, filter elements,
sight gage and valve for damage. Remove cover and inspect interior before resuming
operation. Refer to TM 5-4330-217-12&P.
2-12
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