Taking a 100,000 m³ external floating roof crude oil storage tank as an example, this study utilizes the mainstream hydraulic calculation software PIPET to establish a hydraulic calculation model for its fixed fire cooling water system. The aim is to conduct an in-depth analysis and optimization of the fire cooling water system for large crude oil storage tanks. The results indicate that for a 100,000 m³ crude oil storage tank fire cooling water system, two common configurations should be considered: 4 fire risers and 6 fire risers. The configuration with 4 fire risers (DN150) can meet the design requirements and offers a significant advantage in saving pipe materials. The top ring pipe should not be equipped with pressure relief orifice plates; instead, pressure reduction should be prioritized by adjusting the pipe diameter. For other layers where pressure relief orifice plates are required, it is recommended to choose circular orifice plates, ensuring that the length of the horizontal straight pipe segment before the orifice plate is more than twice the diameter of the ring pipe. Fire sprinklers should adopt water curtain sprinklers, and to ensure uniform water distribution, the flow deviation of a single sprinkler should not exceed 3% of the design flow. The uniformity of water distribution in the system can be improved by adjusting the arrangement of sprinklers near the risers or modifying the K-factor. The pressure at the end sprinkler of the fire cooling water system is recommended to be 0.20 MPa, and the design pressure at the system inlet node is suggested to be 0.60 MPa. The system is more stable when the output flow is 1.10 times the calculated flow.

以100 dam³外浮顶原油储罐为例，利用目前主流的水力计算软件PIPET，对其固定式消防冷却水系统建立水力计算模型，深入分析并优化大型原油储罐消防冷却水系统。结果表明：该消防冷却水系统有4根消防立管和6根消防立管两种常见的布置形式，4根消防立管（DN150）可满足设计要求，并且在节省管材方面优势明显；顶层环管不设减压孔板，应优先通过调整管径来减压，其他层建议选择圆缺型减压孔板，并且应保证孔板前水平直管段的长度大于环管管径的2倍；喷头应采用水幕喷头，为保证配水的均匀性，单个喷头流量的偏差不应超出设计流量的3%，可通过改变靠近立管处喷头的布置形式或K系数提高系统配水的均匀性；消防冷却水系统末端喷头压力宜采用0.20 MPa，系统入口节点设计压力宜采用0.60 MPa，系统出水流量是计算流量的1.10倍时系统更稳定。

margin:0px 0px 16px, padding:0px, border:0px, font-size:16px, vertical-align:baseline, color:rgba(0, 0, 0, 0.9), background-color:#FFFFFF, "> PIPET, 大型原油储罐, 消防冷却水系统, 管材, 配水均匀性, 减压孔板, 消防立管, 流速