Abstract: An apparatus for mixing fluids within a pipe is provided. In one embodiment, the apparatus includes a fluid mixing device with a pipe having a pipe wall and an axial bore for conveying fluids through the pipe. The fluid mixing device also includes a sleeve disposed about the pipe and a cavity provided between an exterior surface of the pipe and an interior surface of the sleeve. The cavity and the axial bore of the pipe are in fluid communication with one another via an opening through the pipe wall. Additional systems, devices, and methods are also disclosed.

Abstract: An apparatus for mixing fluids within a pipe is provided. In one embodiment, the apparatus includes a fluid mixing device with a pipe having a pipe wall and an axial bore for conveying fluids through the pipe. The fluid mixing device also includes a sleeve disposed about the pipe and a cavity provided between an exterior surface of the pipe and an interior surface of the sleeve. The cavity and the axial bore of the pipe are in fluid communication with one another via an opening through the pipe wall. Additional systems, devices, and methods are also disclosed.

Abstract: A sampler for flowing liquid in, for example, a pipeline, said sampler comprising, a pump assembly situated, in use, within the flowing liquid, sampling means connected to said pump assembly to provide a sample of said liquid, drive means to operate said pump assembly, said drive means including driver means, mounted, in use, within said flowing liquid to be driven by the flowing liquid, whereby flowing liquid drives the driver means which in turn drives the drive means and the pump assembly.