An apparatus comprising: a gas turbine engine having a fluid flow path for the conveyance of air through a rotatable compressor, a rotatable turbine, and a combustor capable of combusting a mixture of a fuel and air that traverses the fluid flow path, the gas turbine engine also having a path for the conveyance of a utility working fluid; a first gas turbine passage for the conveyance of a first stream of the utility working fluid and a second gas turbine passage for the conveyance of a second stream of the utility working fluid, wherein the first stream and the second stream are combined to form a merged stream; a flow merging union to merge the first stream of the utility working fluid at a first pressure and the second stream of the utility working fluid at a second pressure, wherein the second pressure is greater than the first pressure, and having an outlet to pass the merged utility working fluid, the flow merging union also including a first inlet in fluid communication with the first gas turbine passage and a second inlet in fluid communication with the second gas turbine passage, the flow merging union including an internal passage forming a flow path surface between the first inlet and the outlet and an internal fluid flow path that extends from the second inlet toward the outlet, the internal passage disposed within the fluid flow path such that a flow of utility working fluid in the internal fluid flow path is routed around the outside of the flow path surface of the internal passage to form a circumferentially extending fluid flow path adjacent a flow path of the internal passage; and wherein the first inlet receives fluid in a direction opposite the fluid received in the second inlet. a gas turbine engine having a fluid flow path for the conveyance of air through a rotatable compressor, a rotatable turbine, and a combustor capable of combusting a mixture of a fuel and air that traverses the fluid flow path, the gas turbine engine also having a path for the conveyance of a utility working fluid; a first gas turbine passage for the conveyance of a first stream of the utility working fluid and a second gas turbine passage for the conveyance of a second stream of the utility working fluid, wherein the first stream and the second stream are combined to form a merged stream; a flow merging union to merge the first stream of the utility working fluid at a first pressure and the second stream of the utility working fluid at a second pressure, wherein the second pressure is greater than the first pressure, and having an outlet to pass the merged utility working fluid, the flow merging union also including a first inlet in fluid communication with the first gas turbine passage and a second inlet in fluid communication with the second gas turbine passage, the flow merging union including an internal passage forming a flow path surface between the first inlet and the outlet and an internal fluid flow path that extends from the second inlet toward the outlet, the internal passage disposed within the fluid flow path such that a flow of utility working fluid in the internal fluid flow path is routed around the outside of the flow path surface of the internal passage to form a circumferentially extending fluid flow path adjacent a flow path of the internal passage; and wherein the first inlet receives fluid in a direction opposite the fluid received in the second inlet.