Abstract
In recent years, some of mini-hydroelectric power stations came into use FRP pipes in place of steel pipes for their penstocks. This report explains some data for designing FRP pipes -allowable stress of their components-, and how to determine pipes' thickness, -trial and error calculation should be done on the severest condition-. And the report also refers to the observation results at a power station in Kanazawa city. They showed that the actual measured value corresponded well to the calculated one on static condition. On dynamic condition, at Cut-off test, pipe's wall vibrated very little risen from water hammer. And the safety of FRP-penstock was warranted
