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Page Title: HOSES, TUBING, VALVES, FITTINGS, AND COMMON HARDWARE ITEMS
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TM 07661B-14-1 APPENDIX A A 3-27.  HOSES, TUBING, VALVES, FITTINGS, AND COMMON HARDWARE ITEMS. a. General.  Refer to figures 3-4 and 3-5 when replacing individual parts of tank plumbing, being sure to take proper precautions that system is depressurized prior to disassembly of piping.  See paragraph 3-12. CAUTION Cover open ends of all plumbing using suitable closures to prevent system contamination. b. Hoses, Tubing, Valves and Fittings.  Removal of hoses, tubes, valves, or pipe fittings from tank piping normally involves  opening  the  plumbing  at  the  nearest  union  or  hose  connection.    Pay  particular  attention  to  location  and orientation of items before removal to assure correct installation.  Basic instructions for disassembly of tank piping into subassemblies is contained in paragraphs 3-13 and 3-14.  Instructions for reassembly and testing after installation also apply. c. Common Hardware Items.  For maximum protection against corrosion, use only corrosion resistant replacement hardware.    In  event  of  unavailability  of  parts,  standard  hardware  can  be  substituted  temporarily.    Damaged  threads  or rounded corners on nuts and heads of bolts is cause for replacement. A  3.28.    GENERAL  CLEANING.       Both  the  dry  chemical  and  AFFF  systems  are  normally  closed,  therefore,  interior contamination  will  be  limited  to  that  created  by  the  firefighting  agents  used  in  the  systems.    Interior  cleaning  of components  will  normally  be  limited  to  those  times  the  components  are  disassembled  for  overhaul  or  corrective maintenance.    Exteriors  should  be  kept  clean  at  all  times.    Normal  daily  clean-up  routine  should  be  sufficient.    Any approved cleaning solvent may be used for cleaning, and compressed air may be used for cleaning inaccessible areas. NOTE Care  should  be  exercised  during  the  cleaning  routine  to  preclude  inadvertent  movement  of valve handles.  Although no damage is likely to result from such handle movement, it could cause a malfunction in operation when the unit is next used. There  are  three  exceptions  to  the  general  statement  concerning  cleaning  of  components.    The  two  nozzle  discharge valves  may  become  clogged  and  require  cleaning  on  occasion.    Additionally,  wet  or  damp  dry  chemical  powder,  or inadequate  cleaning  of  the  dry  chemical  hose  after  use,  can  cause  caking  of  the  powder  in  the  hose,  just  as  residual solution in AFFF hose may freeze, plugging that hose. a. Cleaning Dry Chemical Discharge Nozzle.   The discharge nozzles must be partially disassembled for cleaning. Disassembly and cleaning steps are as follows: (1) Remove the two screws (2, figure 3-12) from the tie bar and separate the Dry Chemical nozzle. (2) Disconnect the dry chemical hose. (3) Remove the male disconnect adapter (1) from the nozzle. (4) Turn nozzle tip (5) counterclockwise to remove it from the shutoff valve body (7).  The interior A 3-35

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