Once the cylinder valve has been turned on, itprovides a continuous air supply to the system regulatorvia the high-pressure hose. The pressure is reduced bythe regulator for use by the wearer, and the low-pressurehose carries the breathable air into the facepiece. As asafety feature, these are positive pressure styleregulators, which means that the air supply to the maskis just above any demand requirements eliminating anypossibility of toxic fumes from entering the wearer’smask.The time each cylinder lasts will be determined by anumber of factors. The main factors will be the physicalcondition and size of the wearer and the work to bedone. Generally, each bottle will last approximately 30minutes from the time it is activated.REVIEW 5 QUESTIONSQ1. How many minutes of air is the EEBD designedto provide?Q2. Why should you stay away from open flameswhen you first remove an EEBD?Q3. What should you listen for when donning anEEBD?Q4. What device is worn by engineering watchstanders?Q5. What is the effective time of an OBA?Q6. When do you pull the cotter pin on an OBAcanister?FIREFIGHTINGLearning Objectives: When you finish this chapter,you will be able to—Recognize the properties of a fire triangle andfire tetrahedron.I d e n t i f y t h e c o n d i t i o n s n e c e s s a r y f o rspontaneous combustion.Identify the types of heat transfer.Fire is a constant threat aboard ship. All possiblemeasures must be taken to prevent a fire, or if one isstarted, to extinguish it quickly. Fires may start froms eve r a l c a u s e s — s p o n t a n e o u s c o m bu s t i o n ,carelessness, hits by enemy shells, or collision. If thefire is not controlled quickly, it may cause more damagethan the initial casualty and could cause the loss of theship.FIRE AND FIREFIGHTINGYou cannot win against a fire. You can fight the fireand you can hold down its damage; but some propertywill be destroyed and, all too often, people will beinjured or killed. Time is always lost, productive work isstopped, and additional effort and materials are requiredto make repairs and to clean up the mess.The objective of fire prevention, therefore, is toprevent fires from starting. Fire prevention is anall-hands, all-day, all-night, heads-up effort. A cigarettetossed in the wrong direction can cause as much damageas an enemy bomb. An oily wiping rag or a sparking toolcan be as dangerous as an open flame in a gasolinedepot.Each ship is required to institute and maintain a fireprevention program. Your part in the fire preventionprogram is as follows:Ensure that all gear is stowed properly.12-18Student Notes:
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