Abstract: A tubing injector has a first injector pair and a second pair of cooperating injector mechanisms. The first injector pair are positioned on a first track and the second pair are positioned on a second track. The tubing injector provides redundancy to address safety concerns. The first injector pair is movable to the engaged position, when the second injector pair is moved to the disengaged position and vice versa.

Abstract: A tubing injector has a first injector pair and a second pair of cooperating injector mechanisms. The first injector pair are positioned on a first track and the second pair are positioned on a second track. The tubing injector provides redundancy to address safety concerns. The first injector pair is movable to the engaged position, when the second injector pair is moved to the disengaged position and vice versa.

Abstract: The invention provides a tank for storing fluids, comprising a vessel and a reinforcing frame extending over the sides of the vessel wherein the vessel has substantially planar sides. The vessel can be substantially quadrilateral. At least a part of the bottom of the vessel can be canted with respect to the sides of the vessel. The invention can also provide a tank for storing fluids, comprising a vessel and a reinforcing frame extending over the sides of the vessel, the frame having a top and a base wherein the vessel is retained in the frame by removable keys that connect the top of the frame to the base.