Multi-layer compensator with spacers arranged between the layers

Claim 1

Multilayer bellows compensator structure extending along a longitudinal axis with interspaces to compensate for thermal expansions in piping and to monitor the interspaces, comprising a corrugated, flexible tube, said tube having an outer circular layer and a spaced concentric inner layer with fluid in the space between the two layers, a plurality of spaced, individual spacers disposed in the space between the two spaced layers, said individual spacers are each as one solid piece with a rectangular cross section and with a width large as compared to its thickness, said individual spacers distributed over the circumference of the inner layer and extending parallel to the longitudinal axis of the compensator, each space between individual spacers forming a gap between such spacers to permit a rapid transport of the fluid content therein to the ends of the compensator, and connecting means to the gaps to monitor the fluid content therein.