How to determine the water filling pressure for liquefied hydrocarbon storage tanks
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Dear teachers, the Code for Fire Protection Design of Petrochemical Enterprises requires that \"full-pressure storage tanks shall be equipped with water injection measures to prevent the leakage of liquefied hydrocarbons.\" The \"Code for Safe Design of Spherical Storage Tanks for Liquefied Hydrocarbons\" requires that \"spherical storage tanks for propylene, propane, mixed C4, raffinate C4, and liquefied petroleum gas shall be equipped with water injection facilities.\" How can we ensure that the water injection pressure meets the requirements?
Sinopec’s \"Design Specifications for Water Injection Systems in Liquefied Hydrocarbon Spheres\" 5.4.3 Determination of water injection pressure 5.4.3.1 For liquefied hydrocarbon spheres with an operating pressure below 0.4 MPa (gauge), since the pressure of the high-pressure fire protection water system surrounding the sphere remains relatively stable between 0.7 and 1.2 MPa, the system pressure of this high-pressure fire protection water network is more than sufficient to meet the water injection pressure requirements for such spheres. When the pressure of the high-pressure fire-fighting water system cannot be maintained stably, it is necessary to consider using a material pump or installing a dedicated pump to increase the pressure. 5.4.3.2 For liquefied hydrocarbon spheres with an operating pressure higher than 0.4 MPa (gauge pressure), when a process pump is used for water injection, the water injection flow rate must be greater than or equal to the leakage rates calculated in Tables 1 and 2; moreover, the pressure must be higher than the sum of the highest operating pressure required for the liquefied hydrocarbon sphere and the pressure losses along the pipeline (including the increased potential energy and kinetic energy). If the above two requirements cannot be met, a dedicated pump needs to be installed to carry out water injection
Very satisfactory answer, thank you!