ARMY TM 9-6115-604-12NAVY NAVFAC P-8-633-12(4) Install right and left hand upper rear stiffeners (5 and 6, Figure 4-12), the #7-#11 top roof panel (7), the #12 toproof panel (4), gaskets (8), gasket (12, Figure 4-13), and roof angles (4 through 8) using hexagon head capscrews, hexagonal nuts, and lock washers (1, 2, and 3, Figure 4-12), and screw and captive washer assemblies(1, Figure 4-13).(5) Install hexagon head cap screws (16, Figure 4-13), lock washers (17), and hexagonal nuts (18), securing roofangles (4 through 8).(6) Install hexagon head cap screws (16, Figure 4-13), flat washers (18), lock washers (17), and hexagonal nuts (19),and install conduit support assembly (13).(7) Install hexagon head cap screws (16), lock washers (17), flat washers (18), and hexagonal nuts (19), and installsupport brackets (15) and conduit support hanger (14).(8) Install mufflers In accordance with paragraph 3-15.4-18. MAINTENANCE OF SOUND INSULATION PANELS. See Figure 4-13. Interior roof and wall panels of thecontrol room are lined with sound insulation material comprised of acoustic dampers and absorbers. To minimizetransmission of engine noise and vibration into the control room and switchgear compartments, the rear control cabinetpanels and supporting hardware are likewise acoustically insulated with acoustic barriers, absorbers, and dampers Repairof sound insulation panels generally consists of patching minor tears and holes on the exterior fabric lining orreplacement of sound insulation layers where damage or deterioration is evident.a.Repair. Repair minor tears and holes on the grey fabric lining by patching over with fabric mending tape.b.Replace. Replacement of sound insulation layers consists of removal of all components mounted on the affectedhousing panel, removal and replacement of sound insulation material on housing panels, and reinstallation ofcomponents and panels. It is recommended that replacement sound insulation layers be precut to properdimensions prior to installation.(1)Determine area requiring sound insulation replacement Remove all mounted assemblies or components fromaffected panel(s) as needed If electrical components require removal, tag and disconnect all wiring connectionsprior to removal.(a)For removal of AC components such as distribution panels, 120 V ac receptacles, junction boxes, controlroom heater, light fixtures and switches, refer to the appropriate paragraphs In Section IX of this Chapter (b)For removal of fan and motor assembly B1 03, fire extinguisher brackets, fan shutter assembly, desk top, anddocument component, refer to paragraph 4-12 of this section.(2)Remove housing panels requiring sound insulation replacement.(a)To remove roof panels, refer to paragraph 4-13, step a, and Figure 4-12 and Figure 4-14. Note that only thefirst three roof panels (4 and 7, Figure 4-12) directly above the control room are acoustically insulated.(b)To remove control room panels requiring sound insulation replacement, refer to paragraph 4-13 and Figure 4-15.(c)To remove engine/generator compartment sound insulations (at rear of switchgear cabinets only), refer to stepd, below.(3)Roof Panel Insulation Replacement.(a)Remove roof angles (4 and 5, Figure 4-13) from #12 roof panel (4, Figure 4-12) by removing screw andcaptive washer assemblies (1, Figure 4-13) at both panel ends. Remove roof strips (2 and 3, Figure 4-13) androof angles (6, 7, and 8) from #10 and #11 roof panels by removing screw and captive washer assemblies (1)at panel comers.4-61
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