LO 6-4 Identify and describe the hazards associated with exhaust emissions and outline control practices

When working on diesel engines, whether it is in a shop or an underground mine, controls for exhaust emissions hazards include:

• Using dedicated extraction fans connected directly to the exhaust pipe outlet using a tightly sealed hose. Extraction fan operation must be combined with fresh outside air to resupply the shop with air extracted by the exhaust ventilation system.
• Verifying that the exhaust hose collector fits snuggly to seal the exhaust stack or tailpipe.
• Closing off unused extraction hose collector ends to maximize extraction volume to running engines.
• Inspecting the vehicle chassis to verify that exhaust is not leaking out of other points in the exhaust system or from the hose collector.
• Verifying that there are no exhaust leaks from other exhaust system components when running the engine with an extraction fan.
• Limiting the amount of time and speed an engine operates in a shop. For example, if the engine is operated to build up air pressure to release the park/emergency brakes, consider using a shop air supply to fill air reservoirs instead of the engine’s air compressor.
• Designating hard to ventilate areas of a shop or work space off-limits for diesel engine operation.
• Enforcing diesel engine idling restrictions on vehicles near the work space.
• Confirming that exhaust extraction and ventilation systems are working correctly. Immediately report to a supervisor any deficiency or poor performance of the exhaust extraction or ventilation system.
• In underground mining operations, technicians may require specialized PPE for respiratory protection, such as an air-purifying respirator equipped with a filter that is certified to meet a legislated standard for removing air contaminants.
• Performing work or repairs on a cool engine. Hot metal and fluids will cause burns.
• Avoiding work around hot equipment, such as exhaust pipes and manifolds. If such work is absolutely necessary, cover the hot equipment with some insulating protection to prevent burns.