Abstract: A threaded connection for double-walled pipes, including an outer pipe, an inner pipe including an outward projection having a threaded conical end, a component connector having a threaded conical end threaded with the outward projection threaded conical end to provide a first threaded connection. The connector having an annular groove and a sealing ring. The threaded connection additionally including an intermediate piece with an inner threaded surface threaded with an outward projection outer threaded surface to provide a second threaded connection configured to turn in an opposite direction with respect to the first threaded connection. The intermediate piece also having a pressing surface that presses the sealing ring against the connector, and a sliding joint engaged with an outer pipe outward projection.

Abstract: System for remotely measuring pressure for pressures exerted by a fluid conveyed by a pipe, the system comprising a measuring tube with a first end connected to the pipe and a second end to a pressure sensing element. The measuring tube completely filled with a liquid and comprising watertight membranes that respectively close its both ends retaining the liquid inside it, a first membrane in contact with the fluid and closing its first end, and a second membrane in contact with the pressure sensing element and closing its second end. The first membrane being sensitive to fluid pressure oscillations and the second membrane o liquid pressure oscillations for propagating the pressure exerted by the fluid to the pressure sensing element for its measure.