A professional who tends equipment that removes excess acid from nitrated crude tetryl explosive, preparatory to further processing. Respnsibilities include:

• Opens valve to load vacuum pan with tetryl slurry.
• Turns steam jet to draw off excess acid.
• Shovels and scrapes remaining moist powder from pan, grids, and filter cloth; and flushes it with water hose down into funnel leading to washing tubs.
• May neutralize acid water from subsequent washing operations.
• May shovel specified amounts of lime into hopper of lime feeder that neutralizes acid water from subsequent washing operations.