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OPERATION OF REMOTE TURRET
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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AFFF VESSEL RECHARGE PROCEDURES (Continued)
TM5-42 1 0-229-14&P 2-23.  SYSTEM SHUT-DOWN AFTER OPERATION PROCEDURES (Continued). d.  Select AFFF mode in remote turret using AFFF/DC selector switch (10,  figure 2-2) and press twin agent acti- vating button (2) until only nitrogen discharges from the turret foam nozzle. e.    Select  Dry  Chemical  mode  in  remote  turret  using  AFFF/DC  selector  switch  (10,    figure  2-2)  and  press  twin agent activating button (2) until only nitrogen discharges from the turret dry chemical nozzle. f.     CLOSE test valves (7,  figure 2-1). g.   CLOSE master control valve (5,  figure 2 -1) by using either manual twin agent pressure activator handline (3) or remote turret pressure activator switch (9,  figure 2-2). h.  OPEN the bleed valves (14 and 18,  figure 2-1). i.   CLOSE all nitrogen cylinder valves if nitrogen pressure in the cylinders has dropped below 1840 psi (12, 686.8 kPa),  so that the cylinders may be changed. NOTE If use has only been minimal and cylinder pressure is in excess of 1840 psi (12,686.8 kPa), then omit step i above.  The system is ready for the next operation. j.  CLOSE the purge valves (16 and 17,  figure 2-1). k.  OPEN the AFFF emergency shut-off valve (9,  figure 2-1) and the dry chemical emergency shut-off valve (13). l.   CLOSE the bleed valves (14 and 18,  figure 2-1). m.  The system is now shut-down and ready for nitrogen cylinder change. 2-24.  AFFF 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 (16,  figure 2-1) and bleed valve (14) to bleed any trapped pressure out of the vessel. e.  OPEN AFFF handline slowly and leave OPEN. If  there  is  any  trapped  pressure  in  the  vessel  its  presence will be apparent from hissing gas escaping from the safety hole  in  the  AFFF  Tank  fill  cap  (15,    figure  2-1).    Do  not Ioosen cap until there is no further gas escaping. 2-73

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