Abstract: A recirculation device permits a relatively inaccessible fluid housed in a vessel having an access port to be evaluated externally of the vessel; the device provides a recirculating flow path extending from inside the vessel passing through the access opening to an external fluid loop, and back to the vessel via the same access opening; the flow path comprises an upstream path and a downstream path, which paths are discrete separate paths throughout their length; flow in the recirculating flow path is induced in the external fluid loop; the fluid can be sensed directly in the fluid loop or a sample can be removed from the loop for evaluation.

Abstract: A seat insert which can be inserted into an inflated or uninflated inner tube by allowing portions of the seat insert to pivot relative to each other the seat insert so that can be inserted into the tube, forced downwardly into longitudinal alignment, and locked into place in the inner tube.

Abstract: Apparatus and method for detecting fault gases in oil insulated transformers including a cell adapted to be located in the fault gas environment, the cell being hollow and including a gas-permeable wall but impermeable to liquids, means for flushing the contents of the cell into an analytical measuring device for determining the concentration of the specific fault gas in the cell.