en.Wedoany.com Reported - In refineries, crude oil tanks are large, frequently turned over and exposed to complex media, making them a key tank farm management focus. When Petrochemical Storage Tanks are used for crude oil, the main issue is not simply capacity. It is controlling water, salts, sediment, sludge, bottom corrosion and water draw-off.
Crudes from different sources vary in density, viscosity, sulfur content, acid number, water content and mechanical impurities. Tanks serve as both buffers and stabilization units before pretreatment. The EIA states that crude oil physical characteristics affect how refineries process it, and crude oils are commonly classified by density and sulfur content. Therefore, crude tank farms should not be designed only by total capacity. They must consider segregation by crude type, blending strategy, settling time and stable feed to processing units.
The most common long-term risk is tank bottom corrosion. Water, salts, sulfides, microbes and sediments accumulate at the bottom, forming localized corrosion environments. If water draw-off is delayed, sludge is not removed, cathodic protection is weak or bottom inspection is insufficient, bottom plate thinning, leakage and soil or groundwater contamination may occur. Bottom failures are often hidden, and once discovered, repair cost and downtime can be high.
Crude oil Petrochemical Storage Tanks should use a closed loop of water draw-off, sludge management, corrosion control and inspection. Operations should monitor water level, bottom water quality, sediment thickness, bottom plate thickness and cathodic protection condition. Turnarounds should focus on bottom welds, annular plates, floating roof drainage and inlet/outlet zones. High-sulfur, high-acid and high-water crudes require more frequent water draw-off and stronger bottom corrosion monitoring. Strong crude tank management supports more stable desalting, distillation and heat exchange.
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