A professional who performs any combination of following duties to fabricate fiberglass air containers used in hydraulic systems. Respnsibilities include:

• Assembles hemispherical mold or mandrel sections of lead alloy to form sphere.
• Covers sphere with rubber-liner halves and cements halves together.
• Examines rubber covering for defects.
• Attaches threaded fittings onto rubber lining at top and bottom of sphere.
• Inserts shaft through fitting opening into sphere and screws into place, using wrench.
• Weighs resin and catalyst in specified amounts and mixes them with agitator.
• Mounts sphere in winding machine and applies resin to surface, using brush.
• Starts machine that winds fiberglass yarn around sphere.
• Measures tension of fiberglass using tensiometer, and adjusts tension arm.
• Removes and weighs fiberglass-covered sphere.
• Records weight on production sheet.
• Places covered spheres in electric oven to bake and dry for specified time.
• Removes and weighs spheres.
• Mounts spheres on steam unit to melt and remove mold.
• Turns valve to admit steam into sphere.
• Turns spigot to discharge molten alloy.
• Weighs sphere and records weight.
• Performs hydrostatic tests on completed spherical containers at various pressures.
• Connects fitting on container to water pipe in safety tank.
• Turns water valves and starts pump to increase pressure in container to specified level.