Mobile tanker

Abstract: A mobile road or rail tanker 10. The tanker 10 is formed of sheet aluminium which forms an outer shell 11. The shell 11 encloses a chamber 13 which is divided by a transverse wall 12. The wall 12 adjacent the shell 11 consists of an annealed heat treatable weldable aluminium alloy which is relatively soft and ductile so that weld material adjacent the wall 12 is stronger than the remainder of the wall 12.

Description: The present invention relates to mobile tankers and more particularly to road and rail tankers. In the design of road and rail tankers, consideration must be given to the ability of the tanker to resist fracture, rupture or puncture in the case of a roll-over or accident. Previous tanker designs have included a circular, oliptical, oval or other similarly shaped outer shell within which there is located baffles and dividers. The dividers and/or baffles are welded to the shell. More particularly, where the tanker is of an aluminium construction, the dividers (bulkheads) and/or baffles are formed of non-heat treatable work hardening alloys. When welded to the outer shell, the weld and surrounding material is not as strong as a divider or baffle. When tankers constructed in accordance with the above are involved in an accident in which the tanker is subjected to an impact, the shell frequently ruptures or tears adjacent the weld due to the strength of the divider or baffle relative to the weld and its surrounding material. It is the aim of the present invention to overcome or substantially ameliorate the above disadvantages. According to the present invention there is provided: a mobile aluminium tanker comprising: an outer shell of aluminium sheet material, enclosing a chamber to receive a liquid to be transported by the tanker; at least one wall extending transversely across said chamber and welded to opposite internal surfaces of said shell; and characterised in that at least the portions of said wall adjacent said shell consist of an annealed heat treatable weldable aluminium alloy which is relatively soft and ductile so that weld material and adjacent wall portions are stronger than the remainder of the wall surrounding said adjacent wall portions. A preferred construction of the present invention will now be described by way of example with reference to the accompanying drawings wherein Figure 1 is a schematic side elevation of a road tanker; and Figure 2 is a schematic enlarged portion of the tanker of Figure 1. In the accompanying drawings there is schematically depicted an aluminium road tanker 10 having an outer shell 11 formed of aluminium sheet material. The outer shell 11 encloses a chamber 13 to receive a liquid, such as petrol, to be transported by the tanker 10. Extending transversely across the chamber 13 and welded to opposite sides of the internal surfaces of the shell 11, are dividers 12. In the present example, the dividers 12 are formed from a single sheet of aluminium material. The dividers 12 are formed of an annealed heat treatable weldable aluminium alloy which is relatively soft and ductile. Joining the dividers 12 to the shell 11 are wells 14. The benefit in the above described means of securing the dividers 12 to the shell 11 is that on welding the annealed heat treatable alloy to the shell, the weld and heat affected zone will be partially heat treated and therefore stronger than the annealed material of the remainder of the divider 12. Consequently, if the shell 11 is impacted, the dividers will collapse (buckle) rather than have the shell 11 shearing away from the dividers 12. This in turn inhibits rupturing of the shell 11 and therefore prevents spillage of the liquid contained within the chamber 13. It should be appreciated that the dividers 12, bulkheads or baffles secured to the shell in the above described manner, need only have the edge portions formed of an annealed heat treatable weldable aluminium alloy which is relatively soft and ductile.

Claims: A mobile aluminium tanker (10) comprising: an outer shell (11) of an aluminium sheet material, enclosing a chamber (13) to receive a liquid to be transported by the tanker (10); at least one wall (12) extending transversely across said chamber (13) and welded to opposite internal surfaces of said shell (11); characterised in that at least portions of said wall (12) adjacent said shell (11) consist of an annealed heat treatable weldable aluminium alloy which is relatively soft and ductile so that weld material and adjacent wall portions are stronger than the remainder of the wall surrounding said adjacent wall portions. The tanker (10) of claim 1, wherein the entire wall is formed of an annealed heat treatable weldable aluminium alloy which is relatively soft and ductile.

Inventors: DINGLE TREVOR, DINGLE, TREVOR
Applicants: HOCKNEY PTY LTD, HOCKNEY PTY LIMITED
Application year: 1992
Main classification: B60P3
IPC codes: B60P3, B61D5