Safety relief device for liquefied hydrocarbon ethylene oxide storage tanks

Abstract

This utility model discloses a safety relief device for a liquefied hydrocarbon ethylene oxide storage tank, comprising a safety valve, a rupture disc, an external discharge pipe connected to the outlet of the safety valve, a steam delivery pipe connected to the external discharge pipe, an automatic valve mounted on the steam delivery pipe, a pressure indicating interlock for controlling the opening and closing of the automatic valve, a connecting pipe whose inlet end is connected to the discharge port of the liquefied hydrocarbon storage tank, and a first nitrogen delivery pipe and a second nitrogen delivery pipe for delivering nitrogen. The outlet end of the connecting pipe is connected to the inlet of the safety valve, the rupture disc is mounted on the connecting pipe, the first nitrogen delivery pipe is connected to the connecting pipe at a position between the discharge port and the rupture disc, and a first check valve is also mounted on the first nitrogen delivery pipe; the second nitrogen delivery pipe is connected to the external discharge pipe, and a second check valve is also mounted on the second nitrogen delivery pipe. This utility model's safety relief device for a liquefied hydrocarbon ethylene oxide storage tank can further reduce the ethylene oxide content below the explosion limit and prevent ethylene oxide from entering the nitrogen delivery pipe.

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