Background
This particular plant manufactures fuel injector nozzles for every G.M. car in the world. There are several parts made for a nozzle, all of which are small -1/8” diameter pins, discs that are 5/8” diameter by 1/8” high, etc.
Problem
They were using vapor degreasers with a freon liquid that was set to be banned (ozone depleting substance) and which was costing them $500,000 a year. They wanted to use aqueous systems but first they had to answer two (2) major questions:
1) The parts can’t be tumbled because of the damage tumbling would cause. Could a jet washer clean and dry a basket of small parts without tumbling?
2) Some of the parts were silica iron which rust in a New York second. Could an aqueous solution protect these parts from flash rust?
 Solution
With nozzle and flow adjustments, a basket load of these small parts could be washed and dried without blowing them out of the baskets. A.C. Rochester loads their standard baskets called “boats” (15”L x 6”W x 4”H) onto the turntables arranged like spokes on a wheel. Each basket had a 2” deep pile of parts. A high concentration of amine-based rust inhibitor prevented rust. If the parts were going to be stored, they were placed in plastic bags impregnated with sodium nitrite.
System
An F-4000-P-ZX built to G.M. specifications. The system had an ARC-11 rinse stage and a 10 HP regenerative blower for drying. The wash tank was automatically refreshed after “x” minutes of wash time by adding water, overflowing into a side tank, and pumping the overflow to their water treatment system.
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