The diesel engines on your general-purpose supply vessel are all protected with dry-type air filters. The air filters should be inspected and replaced in accordance with manufacturer instructions. What is the generally accepted criteria that would dictate when filter replacement becomes necessary?
• Dry-type air filters on diesel engines and how they clog over time • Meaning of pressure drop across a filter element and what it tells you about restriction to airflow • How manufacturers specify a maximum allowable restriction or differential pressure for safe engine operation
• When a dry-type air filter gets dirty, what happens to the resistance to airflow: does the pressure difference across the filter go up or down? • In normal operation, would you be more concerned about a rise or a fall in pressure difference across a partially blocked filter? Why? • Look at the words drop vs rise, and increases vs decreases in each answer. Which combination best matches what you’d expect as a filter plugs up?
• Identify which choices talk about pressure drop and which talk about pressure rise. Are both physically realistic for this situation? • Think about how a dirty/clogged filter affects air flow and manifold pressure. Does that lead to a higher or lower differential pressure across the filter? • Confirm that the trigger point is when a specified limit (maximum or minimum) set by the manufacturer is exceeded in the direction that indicates too much restriction.
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