What device is necessary to shut off motion and auxiliary power for cargo tank motor vehicles with a water capacity of 3500 gallons or less?

In the context of NFPA 58, cargo tank motor vehicles with a water capacity of 3500 gallons or less require a specific device to ensure the safe operation and handling of liquefied petroleum gas (LPG). The correct choice of an off-truck remote shut-off serves a critical safety function by allowing operators to quickly and effectively stop the motion and auxiliary power of the cargo tank vehicle from a distance. This is particularly important in the event of an emergency or a leak, where immediate action is necessary to prevent potential accidents or hazardous situations.

The necessity of having an off-truck remote shut-off is rooted in safety standards that aim to minimize risks during the transportation and transfer of flammable gases. This device facilitates immediate response actions without requiring personnel to be in close proximity to the vehicle, reducing the likelihood of injury or exposure to hazardous conditions.

In contrast, while a remote control panel and an emergency shut-off valve are integral to cargo tank systems, they serve different purposes and are not explicitly designed to satisfy the specific requirement for off-truck operation in this context. A manual locking mechanism, although useful for securing equipment, does not provide the same capability for immediate shut-off from a safe distance.