action must be taken to close the isolation valveson drains located below the CHT tank overflowline discharge and divert upper deck drains over-board to preclude flooding of space. In the eventof leakage or snagging of the transfer hoses, closevalve F (shown in figures 8-5 and 8-6) at the deckconnection only (closure of pier valve may causethe discharge hose to rupture). Line up pumpdischarge diverter valve C for overboarddischarge, to prevent overflow or backup ofdrains located below the tank overflow.At-Sea ModeIn order to set the CHT system up for the At-sea mode (refer to figures 8-5 and 8-6) set soil andwaste drain diverter valves H and J to the OVER-BOARD position. Open pump discharge valvesB and set pump discharge diverter valve C to theoverboard position. Check to insure that gag scup-per valve at the hull in the pump discharge lineis open. Set the discharge pump controller selec-tor switches to the MAN1 position. After thepumps lose suction, set both controller selectorswitches to the AUTO position. Open the tankwashdown supply valve and wash the tank for 30minutes. Close the tank washdown supply valve.Set the controller selector switches to MAN1 posi-tion. After loss of pump suction, set controllerswitches in the OFF position. Close pump suc-tion valves A, discharge valves B, and, in thestrainer system only, close the inflow stopvalvesG.For CHT systems outfitted will comminutorsand aeration systems, secure the comminutor aftersetting the soil drain diverter valves. Close airblower discharge valve M and secure air blower,or close ship supply valve N after tank washdownprocedures have been completed and the pumphas lost suction. If an air aspirator system is in-stalled, shut the system down and secure theaspiration pump.The CHT system is now secured with all soiland waste being discharged overboard through thegravity drainage system.For additional information on the CHTsystem and its components, refer to the manufac-turer’s technical manuals and Naval Ships’Technical Manual, Chapter 593.NOISE POLLUTIONHearing loss problems have been and continueto be a source of concern within the Navy, bothashore and afloat. In the Navy the loss of hear-ing can occur from exposure to impulse or blastnoise (i.e., gunfire, rockets, etc.) or from con-tinuous or intermittent sounds such as jet or pro-peller aircraft, marine engines, boiler equipmentoperations, and any of a myriad of noise sourcesassociated with industrial type activities (such asshipyards). Hearing loss may be temporary, andwill disappear after a brief period of nonexposure,or it may become permanent through repeatedexposures to intense noise levels. The loss of hear-ing sensitivity is generally in the higher frequen-cies of 4000-6000 Hertz (Hz) with many peoplesustaining extensive impairment before the all im-portant speech range of 500-3000 Hz is ap-preciably affected.The Navy recognized noise pollution to be aproblem and started to combat it through theHearing Conservation Program. The main pur-pose of this program is to establish and imple-ment an effective occupational noise control andhearing conservation program which has as itsgoal the elimination/prevention of hearing loss.HEARING CONSERVATIONPROGRAMHearing loss associated with exposure tohazardous noise and the high cost of compensa-tion claims have highlighted a significant problemwhich requires action to reduce or eliminatehazardous occupational noise levels. An effectiveoccupational noise control and hearing conserva-tion program will prevent or reduce the exposureof personnel to potentially hazardous noise. Suchprograms will incorporate the following elements:1. Identification of hazardous noise areas andtheir sources.2. Elimination or reduction of noise levelsthrough the use of engineering controls.3. Periodic hearing testing of noise-exposedpersonnel to evaluate program effectiveness.4. Education of all hands in the command’sprogram and their individual responsibilities.5. Strict enforcement of all prescribed occupa-tional noise control and hearing conservationmeasures including disciplinary action forviolators and supervisors, as necessary.Chapter 8—ENVIRONMENTAL POLLUTION8-19
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