Optimized Design for Anti-Clogging of Crude Oil Storage Tank Floating Roof Drainage System

The optimized design for anti-clogging of the crude oil storage tank floating roof drainage system needs to adopt a three-stage filtration mechanism: 1) Install a 316L stainless steel filter screen (pore size ≤2mm) at the inlet of the central drain pipe to intercept oil sludge and impurities; 2) Install a self-cleaning oil interceptor in the drainage pipe section to achieve automatic oil-water separation through swirl separation; 3) Add an ultrasonic demulsification device to the collection pool outside the fire dike to increase the oil droplet agglomeration and floating efficiency by 40%.

Typical optimization schemes include: 1) Adopt an immersion liquid filling pipe sealing design to control the annular gap oil film thickness below 0.5mm, reducing asphaltene deposition; 2) Adjust the drainage pipe slope to 3‰ or more, and cooperate with a pulse backwashing device (pressure 0.6MPa/cycle 8h); 3) The intelligent monitoring system real-time monitors the drainage flow rate (alarm threshold ≤60% of the design value) and oil concentration (excess value ≤50mg/L).

Implementation effect verification shows that the drainage blockage rate of a 100,000 m³ storage tank after renovation decreased by 80%, and the annual maintenance cost decreased by 350,000 yuan. Key control indicators: 1) Filter screen differential pressure ≤0.02MPa; 2) Drainage pipe flow rate maintained at 0.8-1.2m/s; 3) Collection pool oil-water separation efficiency ≥95%.