At no time should water be applied directly to composite cylinders as it can prevent the temperature pressure relief devices (TPRDs) from functioning properly.LNG VEHICLESLNG vehicle fires can be extinguished using standard tactics unless fire is being fueled by an active leak.In that case protect exposures and allow it to burn.Typically the tanks are so well insulated that even if the vehicle becomes fully involved, there will be very little pressure increase inside the tank.If there is an increase, the pressure relief valve will activate and bleed off the excess pressure, resetting itself when complete.Application of water to the tanks will not prevent it from working properly.