COMPOSITE CONCRETE ROOF FOR AN OUTER LNG CONTAINMENT TANK AND METHOD OF MAKING THE SAME

• US 20100154320A1
• Filed: 12/23/2008
• Published: 06/24/2010
• Est. Priority Date: 12/23/2008
• Status: Abandoned Application

• Current Assignee: Chevron USA Incorporated (Chevron Corp.)
• Original Assignee: Chevron USA Incorporated (Chevron Corp.)
• Inventors: Borov, Vincent G., Shockley, Lestle R.
• Application Number:
  US12/342,495
• Publication Number:
  US 20100154320A1
• Time in Patent Office: Days
• US Class Current: 52/82
• CPC Class Codes: E04H 7/18 mainly of concrete, e.g. reinforced concrete, or other stone-like material

Abstract

A method for constructing a composite concrete roof on an outer LNG containment tank is disclosed. The roof includes a roof assembly and a plurality of precast reinforced concrete roof elements. The roof assembly is mounted on a tank shell. At least some of the roof elements including a concrete body and embedded metal plates adapted to be welded to the roof assembly. The roof elements are welded to the roof assembly to provide additional strength and stiffness to the roof assembly. Preferably, no or minimal cast in place concrete structural joints are needed to join the roof elements to the roof assembly and or top of the shell. Ideally, the roof assembly includes a membrane and mounting beams connected to the membrane. The embedded plates of the roof assemblies are welded to the mounting beams on the roof assembly. The method may further include mounting or welding the roof elements to the roof assembly while workers access the interior of the shell to perform work therein. A tank having a composite concrete roof made according to the above method is also disclosed.

Claims

10. An outer LNG containment tank comprising:

a tank shell and a composite concrete roof mounted to the top of the tank shell, the roof including a roof assembly and a plurality of roof elements welded to the roof assembly by structural welds.

11. The tank of claim 10 wherein:

at least some of the roof elements including a concrete body and embedded metal plates which are welded to the roof assembly.

12. The tank of claim 11 wherein:

the roof assembly includes longitudinally extending mounting beams; and

the metal plates of roof elements are welded to the mounting beams.

13. The tank of claim 11 wherein:

the roof assembly includes a membrane and overlying mounting beams;

and the metal plates of the roof elements are welded to the mounting beams.

14. The tank of claim 11 wherein:

the roof assembly includes a membrane and overlying mounting beams, the mounting beams extending circumferentially and radially over the membrane;

and the metal plates of the roof elements are welded to the mounting beams.