TM 5-4930-230-13Section III. OPERATING UNDER USUAL CONDITIONS.The instructions in this section are for personnel who operate the tank and pump unit. How the unit is started andstopped in normal weather conditions is described.Before you operate. Always keep in mind the CAUTIONS and WARNINGS.Filling 600-Gallon (2271 Liter) Tanks.if tank and pump unit is mounted on any vehicle other than a 5 ton vehicle,extreme caution must be taken when filling the tanks to avoid exceedingcross-country payload limits.a. Be sure that suction hoses connecting tanks to the pump assembly are properly secured. Groundpumping assembly before starting to fill the 600-gallon (2271 Liter) tanks.b. Bonding and grounding procedures areas follows:DEATH or serious injury may result if proper grounding procedures are notfollowed prior to operating the equipment.(1) Bonding is the process that equalizes the charge on two unlike objects such as an aircraft and arefueling nozzle. it is done in order to prevent arcing, in the presence of flammable vapors, as the two objectsare joined.(a) Extend the grounding cable from the ground reel assembly so the plug (if present) can beinserted into the vehicle receptacle. Otherwise, attach one of the grounding dips to a bare metal surface of thereceiving vehicle. Attach the remaining dip to the grounding rod. Bond before the dust cap or gas tank cap isremoved to prevent a spark occurring when fuel vapor is present. Do not disconnect the bond until refueling iscomplete and the gas tank cap and nozzle dust cap are replaced.(2) Grounding of equipment is a means to provide a conductive path into the ground so a static chargeisn’t trapped on the surface of the equipment where it could discharge as a spark.(a) Insert the grounding rod into the soil to the required depth (refer to table 2-2). Drive the rodinto the soil to reach below the permanent ground moisture level.(b) If the top of the rod is level with the surrounding surface, scoop out an area around the top toallow attachment of the ground dips to the rod. Attach the dip from the grounding wheel to the exposedportion of the grounding rod. The refueler and vehicle are now grounded and the refueling process may begin.Table 2-2. Required Depths for Ground RodsType of SoilDepth of Ground Rod Coarse ground, cohesionless sands and gravels 6 feetInorganic clay, claying gravels, gravel-sand-4 feetclay, claying sands, sandy clay, gravelly clay,and silty claySilty gravel, gravel-sand-silt, silty sand, sand,3 feetsilt, peat, muck, and swamp soil(3) Methods of Grounding. There is no quick or easy way to test the adequacy of a ground. The testingprocedures (See FM 10-66 Appendix E) are complex and the equipment is bulky and expensive; therefore,several levels or methods of grounding and bonding are required to meet the various operational needs of theArmy. The three methods/levels are listed in order of preference.Change 132-7
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