What safety measures must be taken during the transfer of CNG to or from cargo vehicles?

Using the hand brake and chock blocks during the transfer of Compressed Natural Gas (CNG) to or from cargo vehicles is critical for safety. This practice ensures that the vehicle remains stationary and secure throughout the transfer process. CNG transfer operations involve handling high-pressure gases, and any unexpected movement could lead to hazardous situations—such as rupture of connections or spills—that might result in fire or explosion risks.

Engaging the hand brake helps to securely immobilize the vehicle, while using chock blocks adds an additional layer of security by preventing the vehicle from rolling. Both safety measures contribute to maintaining control of the vehicle, ensuring that personnel can conduct the transfer safely and effectively without the risk of the vehicle moving unexpectedly.

In contrast, leaving the vehicle unattended can introduce significant hazards; the potential for accidents increases significantly without an operator present to monitor the situation. Setting the vehicle in neutral could inadvertently allow the vehicle to roll, especially during the transfer of potentially hazardous materials. Keeping the vehicle moving at a slow pace contradicts the need for a stable environment during the transfer process, increasing the risk of accidents further. Therefore, the importance of using the hand brake and chock blocks cannot be overstated in this context.