BEWARE OF SILO GAS

 

Silo gas is a confined space hazard that is formed after chopped silage is placed in the silo.  A natural fermentation process takes place, releasing gases.  Nitrogen dioxide (NO²) and carbon dioxide (CO²) are the greatest concern.  These gases can kill with even a small amount of exposure.  NO² is toxic while CO² displaces the oxygen supply in a silo.  Farmers who work around silos should make sure everyone takes the proper steps to beware of silo gas.

·       Label silo to warn of the gas hazards.

·       Be aware of signals of silo gas such as a yellow-brown color or a bleach-lie odor.

·       Lock access to silos to keep bystanders and children out.

·       Do not enter silos after filling has started.  Silo gas concentration may be the highest 48-72 hours after filling.  Lethal concentrations may exist for up to three weeks in poorly ventilated silos.

·       Run the blower to ventilate the silo at least 20 minutes before entering.

·       Obtain and use monitoring equipment to determine the level of NO², CO², or O² present.  If dangerous levels exist, do not enter.

·       If entrance is necessary, a self contained breathing apparatus must be worn by someone trained in its use.  A safety harness should be worn and monitoring should continue while someone is in the silo.

Inspection

___Y  ___N  Monitoring equipment operational

 

___Y  ___N  Safety harness available

 

___Y  ___N  Silo well ventilated

 

___Y  ___N  Silo doors in good repair

 

___Y  ___N  Ladders in good condition

 

___Y  ___N  Lock out available for power

 

___Y  ___N  Guards and shields in place