Tank Blending
Figure 1 - Blending can be improved by a shrouded blending nozzle system because the jet nozzle educts a large quantity of surrounding fluid. This document discusses a simple low cost tank blending method. It is referred to as a shrouded blending nozzle system, and it works quite well. The shroud causes the jet nozzle to educt a large quantity of surrounding fluid, improving blending. A simplified diagram of the nozzle portion is shown in figure 1 above. Make the nozzle point upward at an angle such that a straight line projected from the nozzle would hit the liquid surface 1/2 to 2/3 of the way across the tank diameter. The idea is to promote top to bottom turnover. However, tilt the nozzle slightly to the left to promote a slight swirl effect. Aim the nozzle at a point about 1/3 of a radius off-center. The following rules of thumb apply primarily to the situation where a final tank requires blending after, and perhaps during, transfer from rundown tanks. Base tank size 10,000 barrels...