Abstract: Described herein is a transport tank trailer having a tank that can be used to more completely and effectively transport, store, load and unload a viscous product, such as a viscous liquid product, or liquid with solid(s) in suspension. Materials for transport, storing, loading and unloading include both food-grade and non-food grade products. Exemplary products include chocolate, paint, wastes, and asphalt. The tank system involves: a) agitation means (e.g., vibration devices) to force viscous product to flow during unloading; b) a heat-traced closed loop venting and unloading system resulting in the elimination of opening of the manhole on the tanker, which results in the release of heat; c) use of enhanced insulating materials to reduce product solidification during product discharge; and d) reduction of thermal bridges to increase product heat retention. The invention also involves an inventive cargo tank shape that promotes viscous product discharge during unloading of the tank.

Abstract: Disclosed is a dual stop valve assembly for use in a cargo tank motor vehicle having a flammable material stowing cargo tank with an external pipe for dispensing the flammable material. The assembly includes an external pipe connection section for connecting the external pipe to the cargo tank and has a pair of stop valves spaced apart and operable within the external pipe connection section. The assembly also includes an actuator for actuating opening of each of the pair of self-closing stop valves between a flammable material loading/unloading position and a material transport position. The external pipe connection section includes a break area for promoting breakage of the external pipe connection section along the break area such that, upon breakage along the break area, only an amount of flammable material that is stowed within the external pipe connection section and between the pair of stop valves is discharged. A method of operating a dual stop valve assembly.