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AFFF VESSEL RECHARGE PROCEDURES
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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NITROGEN CYLINDER REPLACEMENT PROCEDURES
TM5-4210-229-14&P 2-24.  AFFF VESSEL RECHARGE PROCEDURES (Continued). f.  When no discharge emits from either the purge valve (16,  figure 2-1) or AFFF handline nozzle, slowly loosen AFFF tank fill cap (15). g.  CLOSE the AFFF emergency shut-off valve (9,  figure 2-1). h.  Close the AFFF handline valve. i.  Using the following table,  determine the amount of AFFF concentrate that must be added. Table 2-12.  AFFF Vessel Fill Readings DIPSTICK READING 1 2 3 4 5 6 7 8 AMOUNT OF 6% AFFF CONCENTRATE 15.15 14.65 13.9 13.0 12.1 11.2 10.3 9.4 TO BE ADDED * DIPSTICK READING 9 10 11 12 13 14 15 16 AMOUNT OF 6% AFFF CONCENTRATE 8.5 7.6 6.7 5.8 4.9 4.0 3.1 2.2 TO BE ADDED DIPSTICK READING 17 18 19 20 AMOUNT OF 6% AFFF CONCENTRATE 1.35 0.6 0.2 0 TO BE ADDED *Quantity to be added can be rounded off to the next higher gallon. j.  Add the AFFF agent slowly. k.  Top up the vessel with water SLOWLY with the fill nozzle submerged to minimize foaming. l.  When the vessel is full,  replace AFFF tank fill cap (15,  figure 2-1) and tighten firmly. m.  OPEN the AFFF emergency shut-off valve (9,  figure 2-1). n.  CLOSE purge valve (16,  figure 2-1) and bleed valve (14). o.  OPEN all nitrogen cylinder valves. p.  Check that all valves and gauges are in the STAND-BY mode of operation (paragraph 2-19). 2-25.  DRY CHEMICAL VESSEL RECHARGE PROCEDURES. a.  CLOSE all nitrogen cylinder valves. b.  CLOSE test valves (7,  figure 2-1). c.  Check that the master control valve (5,  figure 2-1) is CLOSED. d.  OPEN purge valve (17,  figure 2-1) and bleed valve (18) to bleed any trapped pressure out of the vessel. e.  OPEN dry chemical handline slowly and leave OPEN. 2-74

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