What LP-gas activities require sources of ignition to be turned off?

The correct choice highlights the critical safety measures necessary during various LP-gas handling activities to prevent fire hazards. Specifically, connecting and disconnecting tanks, transferring LP-gas, and venting all involve potential exposure to flammable vapors.

When venting, for instance, gas is released into the atmosphere, which can accumulate and ignite if there are any active ignition sources nearby. Similarly, connecting or disconnecting tanks involves movement that could release vapors into the air. During the transfer of LP-gas, the risk of creating a spark or other ignition sources is significant due to the presence of gas under pressure.

Consequently, turning off all sources of ignition before engaging in these activities is crucial to maintaining a safe working environment. This practice is grounded in the principles of fire prevention and safety outlined in NFPA 58, ensuring that all personnel handling LP-gas are protected from potential accidents related to ignition.

Maintaining awareness of the hazards related to ignition sources while performing these LP-gas activities is essential for adherence to safety regulations and best practices in the industry.