| 摘要 |
PURPOSE: A tank for storing a liquid product is provided to improve the working efficiency by removing undesirable materials accumulated in the bottom of a storing tank. CONSTITUTION: When a worker opens a block valve of a drain tube, a undesirable material is drained to the outside of a tank(1). During draining, the undesirable material is guided by a gravity toward a center unit(6) of a bottom unit(5). The undesirable material is drained under a ramp(8) of a drain channel(7) toward a girth of the tank bottom unit, and the undesirable material is removed from the inside of the tank(1) by passing a drain tube therein. When an indicating device of level indicates that the level of sludge descend drops block to predetermined limit, the worker closes the valve.
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