Spill containment assembly

1. A spill containment assembly for containing fluid spilled or leaked from a vessel, comprising:

a flexible bag having a bottom and a sidewall that cooperate to define a volume, the bag sidewall having an upper flap portion that defines an opening, wherein said flexible bag is non-self supporting such that said sidewall and upper flap portion normally collapse onto said bottom and rest upon said bottom; and

a rigid grate having a perforated structure including a perforate upper surface and a perforate lower surface, said grate being sized and adapted to be inserted into said flexible bag via said opening in the upper flap portion, and wherein, once said grate is received within the bag, said grate occupies a portion of said bag volume, said upper flap portion rests upon a peripheral portion of the grate upper surface, and said grate lower surface rests upon the bag bottom such that said grate supports said upper flap portion and said sidewall in a spaced relation to said bag bottom and thereby renders a remaining portion of said bag volume available to receive fluid, said grate upper surface being exposed and accessible via said opening such that the vessel may be disposed on the grate upper surface so as to extend above said bag opening, said grate perforated structure allowing fluid spilled or leaked from the vessel to flow into the grate, from the upper surface toward the lower surface, while said bag contains such leaked or spilled.

2. The assembly as defined in claim 1 , wherein the grate is one of a plurality of grates that are received in the bag.

3. The assembly as defined in claim 1 , wherein the grate is disposed entirely within the volume defined by the bag.

4. The assembly as defined in claim 1 , wherein the bag is formed from a single sheet of flexible material having folded corners so as to define a bowl-shape.

5. The assembly as defined in claim 1 , wherein the bag is formed of polyvinyl plastic.

6. The assembly as defined in claim 1 , wherein the bag is formed of a material that is selected from the group consisting of water resistant material, acid resistant material, ultraviolet radiation resistant material, corrosion resistant material, solvent resistant material, abrasion resistant material, heat resistant material, cold resistant material, electrically non-conductive material, and electrostatically dispersive material, and combinations thereof.

7. The assembly as defined in claim 1 , wherein the bag comprises a first layer of material and second layer of material, the second layer being coextensive with at least a portion of the first layer.

8. The assembly as defined in claim 1 , wherein the bag comprises a reinforcement structure selected from the group consisting of a rib, a cord and a thickened strip.

9. The assembly as defined in claim 1 , further comprising a gripping surface, a sliding surface or an abrasion resistant surface disposed on an outer surface of the bottom of the bag.

10. A spill containment assembly in combination with a vessel, said spill containment assembly being adapted to support the vessel and contain fluid spilled or leaked from the vessel, comprising:

a flexible bag having a bottom and a sidewall that cooperate to define a volume, the bag sidewall having an upper flap portion that defines an opening, wherein said flexible bag is non-self supporting such that said sidewall and upper flap portion normally collapse onto said bottom and rest upon said bottom; and

a grate having a perforated structure including a perforate upper surface and a perforate lower surface, said grate being sized and adapted to be inserted into said flexible bag via said opening in the upper flap portion, and wherein, once said grate is received within the bag, said grate occupies a portion of said bag volume, said upper flap portion rests upon a peripheral portion of the grate upper surface, and said grate lower surface rests upon the bag bottom such that said grate supports said upper flap portion and said sidewall in a spaced relation to said bag bottom and thereby renders a remaining portion of said bag volume available to receive fluid, said grate upper surface being exposed and accessible via said opening,

wherein said vessel is disposed on the grate upper surface and supported thereby so as to extend above said bag opening, said grate perforated structure allowing fluid spilled or leaked from the vessel to flow through the opening into the grate, from the upper surface toward the lower surface, while said bag contains such leaked or spilled fluid.

11. The combination as defined in claim 10 , wherein the grate is one of a plurality of grates that are received in the bag.

12. The combination as defined in claim 10 , wherein the grate is disposed entirely within the volume defined by the bag.

13. The combination as defined in claim 10 , wherein the bag is formed from a single sheet of flexible material having folded corners so as to define a bowl-shape.

14. The combination as defined in claim 10 , wherein the bag is formed of polyvinyl plastic.

15. The combination as defined in claim 10 , wherein the bag is formed of a material that is selected from the group consisting of water resistant material, acid resistant material, ultraviolet radiation resistant material, corrosion resistant material, solvent resistant material, abrasion resistant material, heat resistant material, cold resistant material, electrically non-conductive material, and electrostatically dispersive material, and combinations thereof.

16. The combination as defined in claim 10 , wherein the bag comprises a first layer of material and second layer of material, the second layer being coextensive with at least a portion of the first layer.

17. The combination as defined in claim 10 , wherein the bag comprises a reinforcement structure selected from the group consisting of a rib, a cord and a thickened strip.

18. The combination as defined In claim 10 , further comprising a gripping surface, a sliding surface or an abrasion resistant surface disposed on an outer surface of the bottom of the bag.