Lube Oil Blending Plant Process Flow Diagram

| Equipment | PFD Symbol | |-----------|-------------| | Storage tank | Cylinder with flat or conical bottom | | Pump | Circle with arrow direction | | Heat exchanger | Two circles with crossing lines | | Blender (agitator) | Circle with crossed propeller | | Static mixer | Circle with internal zigzag | | Flow meter | Circle with “FE” (Flow Element) | | Control valve | Diamond with actuator line | | Filter | Rectangle with diagonal lines |

| Additive | Function | Typical Dosing (wt %) | |----------|----------|----------------------| | | Polyalpha‑olefins, esters – raise VI | 0.1‑2 | | Antioxidants (e.g., phenolic) | Prevent oil oxidation | 0.02‑0.5 | | Extreme Pressure (EP) Agents | Sulfur‑phosphorus compounds – protect gear teeth | 0.2‑2 | | Detergents/Dispersants | Keep sludge low | 0.3‑1 | | Anti‑wear (AW) Additives | Zinc dialkyldithiophosphate (ZDDP) – wear protection | 0.2‑1 | | Pour‑point depressants | Low‑temperature flow | 0.05‑0.5 | lube oil blending plant process flow diagram

: The actual mixing occurs in large blending vessels equipped with agitators or jet mixers. This stage is critical for creating a uniform product and may take 1 to 3 hours per standard batch. | Equipment | PFD Symbol | |-----------|-------------| |