What should technicians address before beginning an offloading or transfer operation involving solids, liquids or gases?

• A. Temperature
• B. Humidity
• C. Static Electricity
• D. Pressure

Answer: (C)

Static electricity is the primary ignition risk during offloading or transferring materials, so it must be controlled before you start. As powders, liquids, or gases move and flow, they can generate static charges on containers, hoses, and fittings. If there’s a potential difference between the source and receiving vessel—or between equipment and the surrounding environment—a spark can occur and ignite flammable vapors or dust.

The best way to address this is to create a continuous conductive path between all pieces of equipment and the receiving vessel by bonding and grounding, and to use conductive or static-dissipative hoses and fittings. This allows any charge to leak away harmlessly rather than sparking. Maintain safe practices to avoid ignition sources in the area and ensure the atmosphere isn’t uncontrollably flammable during the transfer.

Temperature and pressure matter for other reasons, such as container integrity and vapor pressure, but they do not provide the same direct, preventive control against ignition that bonding and grounding offer. Humidity can influence how much static builds, but the key preventive action is eliminating potential static ignition pathways through proper bonding and grounding.