Freight container

Abstract

A freight container for transporting a pressurized fluid at a design pressure P, including a tank and mounted within an ISO frame. The tank includes a vessel formed of a material having an ultimate tensile strength SU. The vessel has a cylindrical shell having an inside radius RI and a thickness Ts which is less than that of prior art freight containers and substantially equal to: (P*R i )/((S u /X a) −(X b *P)). Such a vessel conforms to ASME Boiler and Pressure Vessel Code, Section VIII, Division 2. The freight container may be mounted on a transport vehicle, before or after being filled with the pressurized fluid, and transported to a remote location.

1 . A tank for storing a pressurized substance at a design pressure P w , comprising:
 a shell having a wall thickness T s , an inner radius R internal  and tensile strength S u ;   one or more head caps affixed to the shell; and,   wherein the wall thickness T s  is defined by the equation:
     T   s =( P   w   *R   i )/(( S   u   /X   a )−( X   b   *P   w )) 
   wherein X a  is a scalar greater than 1.5.   
     
     
         2 . The tank as defined in  claim 1 , wherein the scalar X a  is in the range between 1.5 and 3. 
     
     
         3 . The tank as defined in  claim 1 , wherein the scalar X a  is substantially equal to 2.5. 
     
     
         4 . The tank as defined in  claim 1 , wherein the design pressure P design  is in the range between 50 and 750 psi. 
     
     
         5 . The tank as defined in  claim 1 , wherein the design pressure P design  is in the range between 150 and 550 psi. 
     
     
         6 . The tank as defined in  claim 1 , wherein X b  is a scalar less than 1. 
     
     
         7 . The tank as defined in  claim 6 , wherein X b  is substantially equal to 0.5. 
     
     
         8 . The tank as defined in  claim 1 , wherein S u  is in the range between 60,000 psi and 100,000 psi. 
     
     
         9 . The tank as defined in  claim 1 , wherein S u  is in the range between 80,000 psi and 90,000 psi. 
     
     
         10 . The tank as defined in  claim 1 , further comprising:
 one or more valves permitting the transfer of the associated pressurized substance to and from the tank.   
     
     
         11 . A freight container for transporting a pressurized substance at a design pressure P w  to a remote location, the freight container comprising:
 frame for transmitting static and dynamic forces arising from transportation of the freight container as a whole; and,   a tank received within the frame, wherein the tank includes:
 a shell having a wall thickness T s , an inner radius R internal  and tensile strength S u ; 
   one or more head caps affixed to the shell; and,   wherein the wall thickness T s  is defined by the equation:
     T   s =( P   w   *R   i )/(( S   u   /X   a )−( X   b   *P   w )) 
   wherein X a  is a scalar greater than 1.5.   
     
     
         12 . The freight container as defined in  claim 11 , wherein the scalar X a  is in the range between 1.5 and 3. 
     
     
         13 . The freight container as defined in  claim 11 , wherein the scalar X a  is substantially equal to 2.5. 
     
     
         14 . The freight container as defined in  claim 11 , wherein the design pressure P design  is in the range between 50 and 750. 
     
     
         15 . The freight container as defined in  claim 11 , wherein the design pressure P design  is in the range between 150 and 550. 
     
     
         16 . The freight container as defined in  claim 11 , wherein X b  is a scalar less than 1. 
     
     
         17 . The freight container as defined in  claim 16 , wherein X b  is substantially equal to 0.5. 
     
     
         18 . The freight container as defined in  claim 11 , wherein S u  is in the range between 60,000 psi and 100,000 psi. 
     
     
         19 . The freight container as defined in  claim 11 , wherein S u  is in the range between 80,000 psi and 90,000 psi. 
     
     
         20 . The freight container as defined in  claim 11 , further comprising:
 one or more valves permitting the transfer of the associated pressurized substance to and from the freight container.