TM 5-4930-230-13(a) Method 1: equipment is grounded to a rod or rods that have measured resistance to groundequal to or less than 10,000 ohms. Ground the refueling system or vehicle and aircraft to this tested groundrod. Bond the nozzle to the vehide/aircraft. 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 fixedairfield 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 2uses an untested ground - a grounding system based on the knowledge that damp earth will accept and drainoff an electrical charge. Use method 2 when the location, tactical situation, or type of operation makes itimpossible to test ground rods. Ground equipment to a rod or rods driven a specific depth into the grounddepending on the type of soil at the site (see table 2-2). The depth to which the rods must be driven isdetermined by the normal depth of permanent ground moisture in the various types of soils. The commander ofthe operating unit must authorize the use of method 2. This method is less desirable. Employ method 2 whenimpossible to use method 1.Death or serious injury may occur if proper bonding procedures are notfollowed. While using method 3, an object with a different electricalpotential (any object that is not part of the bonded system) should notcome into contact with the bonded equipment when a flammable vapor-airmixture may be present.(c) Method 3: When the climate, terrain, or tactical condition makes it impossible to secure asatisfactory 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 underany circumstances. Method 3 relies on bonding alone (see paragraph 2-12b ). Bonding is made between theaircraft/vehicle and the refueling system or refueler along with the nozzle and the aircraft/vehicle. A contactbetween 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 operatingunit. This is the least desirable method since it involves bonding only.c. Open only the manhole cover fill plug of the tank being filled. Do not fill two tanks at the same timeunless operator has an assistant. If fuel is spilled, wash the area of spillage thoroughly with water.a. General.(1) The tank and pump unit is used to dispense automotive, aviation and burner fuel. However, onlyone grade of fuel should be carried in and dispensed from the unit at a time. Since the pumping assembly ishighly adaptable, dispensing with the tank and pump unit may be done in a variety of ways to meet differentsituations in the field. The following paragraphs cover some common operational procedures for the tank andpump unit in the field (see figures 2-1 and 2-2).2-8Change 13WARNING
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