PURPOSE: To facilitate bot stopping and starting motions for a power plant ever so easy, by installing a lot of flat vessels stacking in position adjacent to a vessel housing the power plant of a perpetual motion or the like, while connecting the said vessel to each of these flay vessels via a pipe provided with valves interposingly.

CONSTITUTION: Plural pieces of vessels AWP made up of setting up plural struts 17 inside are mounted and locked on a ferro-concrete foundation 10 adjoining to a vessel 1 having built in a first-class perpetual motion (unillustrated herein) or a power plant in a position 18 in a state of being stacked in layer. A cleaning service inlet is installed one side of each of these vessels AWP and this inlet is closed by a lid 20. Each of these vessels AWP is connected to the vessel 1 via pipes 3 and 5 provided with each of valves 2 and 4, and vessels NWP is connected to a turbine pump 7 via a pipe 29 provided with a valve 30 interposingly, and furthermore these vessles AWP are connected each to a turbine pump 11 via a pipe 25 provided with a valve 23. The outlet side of each of these pumps 7 and 11 is connected to the vessel 1 via pipes 13 and 14.