Probably a friction stir welded tank my team built….ha. One million linear inches of weld without a defect… definitely NOT trial and error…
That's impressive. The tank was an open honeycomb design. When they explained what they wanted to clean, I definitely took a deep breath. But we able to clean the tank using only about 100-gallons of cleaner. We used a high pressure multi-axis spray nozzle using Teflon diaphragm pumps to keep the fluid clean and as the fluid drained from the tank, a bank of 0.1-micron absolute filters kept the cleaning agent (that I had a Patent for) clean for continuous use with sampling of effluent to determine the process efficiency. However, the irony is the company w/o my knowledge and w/o including me, filed for and got a patent for the cleaning process; but they never made any money on it. I uncovered the Patent while researching something else. Oh well, so much for ethical behavior.
Take care and best wishes for the holidays,
Neil