Which of the diesel engine exhaust mufflers listed is usually equipped with a spark arrestor?
• Difference between wet-type and dry-type diesel exhaust systems • Purpose of a spark arrestor in preventing fire hazards • Which exhaust systems discharge hot, dry gases versus cooled, water-mixed gases
• Which type of exhaust has the greatest risk of emitting hot sparks that could ignite nearby combustible material? • How does mixing seawater with exhaust gases change their temperature and ability to carry burning carbon particles? • Think about which exhaust systems are more often used on small workboats and vessels operating near flammable structures or vegetation.
• Identify which muffler type produces very hot, dry exhaust likely to carry sparks • Confirm which muffler type mixes cooling water with exhaust gases, greatly reducing spark risk • Match the highest fire risk exhaust type with the one most likely to be fitted with a spark arrestor
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