The vertical storage tank of liquefied natural gas that has drainage device

The utility model discloses a vertical storage tank of liquefied natural gas that has drainage device, storage tank include storage tank cushion cap, shell of tank, tank deck, the outer fringe of said tank deck sets up the round parapet, and the lower part of parapet sets up the inside and outside wash port of a plurality of intercommunication parapets, the pipeline is fixed in shell of tank outer wall, pipeline upper end intercommunication wash port, pipeline lower extreme intercommunication storage tank cushion cap or subaerial escape canal, the inboard wash port drill way of parapet keeps off there is the double-edged fine-toothed comb board, the pipeline is made for the polyvinyl chloride pipe material, said storage tank also includes the counterfort post, and counterfort post protrusion is fixed in on the shell of tank of counterfort post both sides in shell of tank, pipeline. This vertical storage tank is the rainwater of let-down vessel tank deck in an organized way, avoids pollution, the corruption to the shell of tank of rainwater that the tank deck flowed down.