Guides & Toolkits

SILO SAFETY 3 800-AOY-01-IADO © 2019, Workplace Safety & Prevention Services (WSPS) 1 877 494 WSPS (9777) | 905 614 1400 | wsps.ca Safety Guidelines for Silos It is important to work safely in and around silos. Be alert for silo gas odours and/or fumes in or near the silo. The greatest danger from nitrogen dioxide gas is in silage during the first 12 to 60 hours after filling. Take care to avoid possible exposure for 10 days after filling the silo, and when opening the silo for feeding. Ventilate the silo room adequately for at least two weeks after filling – Open the windows and outside doors of the silo room and use fans if necessary – If the silo adjoins a barn (or other building), use portable exhaust fans to blow air into the feed room to dissipate some of these vapours or gases. Air would then be expelled through the feed room rather than the reverse – A box duct connected over the inside of the fan and extending down to 150mm above the feed room floor will ensure silo gas is effectively removed – Keep all doors closed and the roof panel open for more effective ventilation Post all appropriate warning signs. Oxygen-limiting silos require a sign that warns people of the absence of oxygen Barricade enclosed silo areas to prevent anyone from entering the silo Keep a hatch door open close to the level of silage in the silo When filling or emptying, never allow people in or around the silo Before Entering a Silo Never enter a silo unless it is absolutely necessary. Seek professional help from persons who are knowledgeable, trained, and qualified to make confined space entries. Confined space procedures should be followed for every entry. Do not enter the silo for 4 to 6 weeks after filling stops, since this is the most dangerous time. Test the air for oxygen levels and hazardous gases and vapours before entering. Always wear a self-contained breathing apparatus. In addition to the breathing apparatus, when entering a silo, you should always use a rope and safety harness and a person must be stationed outside to summon help if needed. Train all personnel about the hazards and safety procedures you have implemented for working around silos and other confined spaces on your farm. Allow only properly trained employees to enter the silo or other confined spaces. If you hire someone to work in your silo, like a contractor or service provider, make sure they have received appropriate safety training, equipment, and entry procedures are in place. WSPS.CA

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