Tank and a method for storing an easily polymerizable compound

1. Field of the Invention According to the present invention, a tank for storing an easily polymerizable compound, the tank fitted with a liquid inlet pipe , a liquid draw-off pipe and a liquid recirculating pipe , is characterized in that, assuming terminal ends of the individual pipes are located at the same height, the apex angle formed by a line joining the central points of the end openings of the pipe and the pipe at the central point of a horizontal cross section of the tank, or the apex angle formed by a line joining the central points of the pipe and the pipe at the central point of the horizontal cross section of the tank, is equal to or larger than 90°. A method of storing an easily polymerizable compound of the invention utilizes the aforementioned tank for storing the polymerizable compound.