wiping rags immediately or store them in firesafecontainers. Avoid trip hazards by maintaining properstowage. Do not allow fire hazards to accumulate.REVIEW 9 QUESTIONSQ1. Before beginning work to repair a piece ofequipment, you should take what action?Q2. What personnel are authorized to operate gaswelding or cutting equipment?Q3. When working around rotating machinery, whattypes of clothing/equipment should you wear?LIQUIDS UNDER PRESSUREAny liquid in a system that has been pressurized isto be considered dangerous until the pressure has beenremoved. For example, the ship’s fire-main system usessalt water that has been pressurized to make the wateravailable throughout the ship. The pressurized water inthe system is not dangerous, but the misuse of it is.Therefore, you should observe the following safetypractices when using the fire-main system or any othersystem that may have pressurized liquid in it:Never connect or disconnect a hose from thesystem until the pressure has been removed. Thiscan be done by shutting off the valve on thefire-main system.Never use ruptured or worn hoses with anysystem that has pressure in it.Never point a charged (pressurized) fire hose atanyone.Spray paints, butane fluids, lacquers, and otheraerosol products contain liquids under pressure.Be extremely careful with these containers.Don’t use these containers near a flame, throwthem in a fire, or puncture the containers.ACIDS, ALKALIES, AND OTHERCHEMICALSAcids and alkalies are used in the Navy in the formof pure compounds and mixtures. Acids and alkalies arehazardous because they’re corrosive (cause chemicalburns) when they come in direct contact with the skin,eyes, or other body tissues. They can cause breathingdifficulties or injure respiratory organs if too much ofthe acid mist is inhaled. The acids and alkalies can alsocause dangerous chemical reactions if not handledproperly.When handling acids, alkalies, or other chemicals,you should observe the following precautions:Wear chemically resistant rubber or plasticgloves.Wear chemically resistant rubber or plasticgoggles. You may need to wear a plastic faceshield in addition to the goggles.Wear chemically resistant rubber boots orovershoes with resistant soles. Wear trousersoutside of the boots.Wear a rubber or plastic apron.Wear a respirator when indicated for thechemical you are working with.Persons who have been exposed to acids or alkaliesshould seek medical attention immediately.MARINE SANITATION SYSTEMSSewage is a mixture of all liquid domestic wastes,especially human body wastes (fecal matter and urine).Sewage contains large numbers of microorganisms,some of which are disease bearing. Bacteria and virusesenter the human body through the mouth, nose, opensores, and so on. Therefore, you must observe thefollowing basic precautions when working insewage-handling areas.19-18Student Notes:
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