A professional who tends tanks in which crude tetryl explosive or nitrocellulose is boiled and washed to remove acids and impurities. Respnsibilities include:

• Admits batch of crude tetryl slurry to boiling tank.
• Starts tank agitators and turns valve to admit steam to tank jacket to boil slurry for specified time.
• Pumps off water after material has settled.
• Pumps fresh water through tank to wash tetryl and flush away impurities.
• When boiling nitrocellulose, admits acid to tub and boils contents for specified time, adds neutralizing agent, and repeats process until all nitrocellulose impurities are removed.
• May test acidity of solution, using hydrometer or titration test.
• When boiling tetryl, is designated Tetryl-Boiling-Tub Operator.