Is it necessary to install a water injection system for fully pressurized liquefied butane storage tanks?

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This post was last edited by gyhong on 2020-6-10 at 15:21. There is currently a project modification design, and the client requires the installation of water injection facilities for all pressurized butane storage tanks, in accordance with the recommendations from the safety assessment. The basis for evaluating the company is Article 6 of the \"Standards for Identifying Major Potential Hazards in Production Safety Incidents in Chemical and Hazardous Chemicals Production and Operation Units (Trial):\" \"Full-pressure liquefied hydrocarbon storage tanks do not have water injection measures in place in accordance with **the standards.\" ”There is also the Code for Fire Protection Design of Petrochemical Enterprises. However, according to the \"Interpretation of the Criteria for Identifying Major Potential Hazards in Production Safety Incidents in Chemical and Hazardous Chemicals Production and Operation Units\", the principle behind water injection is as follows: when a fully pressurized storage tank leaks, injecting water into the tank raises the level of the liquefied hydrocarbon, thereby placing the leak site below the water surface. This helps to reduce or prevent the leakage of liquefied hydrocarbons, thus stopping the incident in its infancy. At the same time, explanations were provided regarding liquefied hydrocarbon storage tanks that require water injection facilities: the liquefied hydrocarbon storage tanks that need such facilities are mainly those at normal temperature and under full pressure; water injection measures are not necessary for semi-frozen pressure-type liquefied hydrocarbon storage tanks (such as those for ethylene), nor for storage tanks containing liquefied hydrocarbons that react when in contact with water (such as chloromethane). According to Article 7.4 of the \"Code for Safe Design of Spherical Storage Tanks for Liquefied Hydrocarbons\" SH 3136-2018, spherical storage tanks for propylene, propane, mixed C4, raffinate C4, and liquefied petroleum gas shall be equipped with water injection facilities. In my opinion, the condition for installing water injection facilities should be that liquefied hydrocarbons are insoluble or only slightly soluble in water; papers on the Internet also mention this point. However, butane is soluble in water, so it is not meaningful to install water injection facilities in butane storage tanks. But mixed C4 also contains butane. After communicating with the evaluation company, the safety assessment specialist said that butane, similar to liquefied petroleum gas, requires installation. It makes some sense as well. Therefore, I would like to ask the experts here: is it meaningful to install water injection facilities in fully pressurized liquefied butane storage tanks? If it needs to be set, how should it be set? Thank you!