- Domeniu: Government; Labor
- Number of terms: 77176
- Number of blossaries: 0
- Company Profile:
A professional who controls automatic or semiautomatic equipment to polymerize solutions in reaction kettles to produce synthetic-rubber polymers, such as silicone or neoprene, following written specifications. Respnsibilities include:
* Weighs solid or liquid chemical additives, using balance or floor scale.
* Dumps ingredients into kettle, using overhead hoist.
* Turns valves to load kettles with monomer, catalyst, and modifier solutions.
* Starts agitator and turns steam or water valves to activate and control polymerization.
* Observes and records dial and gauge readings, and draws and tests samples to determine degree of completion of polymerization.
* Turns valves to release vacuum and to cool batch to terminate polymerization.
* Starts pumps to transfer nonreacted materials to rerun tank.
* Flushes kettle with water and changes filter socks, or cleans kettle, using brushes and cleaning solvents.
* May remove reactor cover and manually dump catalyst in reactor.
Industry:Professional careers
A professional who controls equipment to combine and process acids and specified chemical ingredients to produce explosives, such as nitroglycerin, tetryl, or TNT. Respnsibilities include:
* Admits specified ingredients, such as mixed acids and toluene compounds, to metering or weighing tanks, and regulates feed to nitrator in specified timing and sequence.
* Starts agitator to mix ingredients for prescribed time or until settling occurs.
* Observes temperature and pressure gauges and turns steam and coolant valves to regulate reaction within specified limits to prevent explosion.
* Transfers batch or specified components to storage tanks or other processing equipment after prescribed time or when visual inspection indicates reaction is completed.
* Records gauge readings, nitration time, and ingredients consumed in shift log.
* May be designated according to explosive produced as batch nitroglycerin-nitrator operator; tetryl-nitrator operator; or according to intermediate materials nitrated as binitrotoluene operator; mononitrotoluene operator.
* May control continuous-process equipment and be designated biazzi-nitrator operator.
Industry:Professional careers
A professional who controls reactor vessels to polymerize raw resin materials to form phenolic, acrylic, or polyester resins. Respnsibilities include:
* Pumps specified amount of raw material into calibrated tank according to formula and transfers materials into reactor.
* Starts mixers and pumps reagents and catalysts into reactor.
* Starts circulation and vacuum pumps.
* Adjusts valves to regulate flow of preheated or cooled fluid around jacket of reactor and to start and regulate polymerization reaction.
* Adjusts valves to regulate pressure and temperature in reactor.
* Tests viscosity and pH of resins to determine length of polymerization time, using pH meters and viscosimeters.
* Turns valves to discharge processed materials from kettles into cooling pans.
* Records processing time, pressure, temperature, and test results in log; and writes daily reports on amounts of raw materials used and finished product barreled or stored.
* May dump compounds into polymerized resins to thicken product.
* May pump polymerized resin from storage tanks to tank trucks or cars for shipment.
* May cast liquid plastics in molds.
* May analyze sample of plastics materials to determine clarity, acidity, fusibility, or brittleness, using slide rule, torsion balance, and other testing equipment.
Industry:Professional careers
A professional who controls carbonating tower to precipitate sodium bicarbonate crystals from ammoniated brine in Solvay process production of soda ash. Respnsibilities include:
* Observes temperature, pressure, and flowmeter gauges and adjusts valves and controls to admit ammonia and brine to converter and to regulate process conditions, according to plant procedure.
* Tests concentration of product, using standard test equipment and procedure, and adjusts temperature in tower to produce sodium bicarbonate crystals of specified size and concentration for efficient filtering, washing, and drying of product, to form soda ash.
* Flushes feedlines, using steam hose; and replaces gaskets, using handtools.
* May tend stills and related equipment to produce ammonia for absorption into brine.
Industry:Professional careers
A professional who controls premixer and reaction vessels to produce orthophosphate liquor by reaction of phosphoric acid with soda ash. Respnsibilities include:
* Sets timing device on weigh tank to effect prescribed feed rate of soda ash to premixer.
* Starts premixer, pumps, exhaust fans, screw conveyors, and bucket elevator in required sequence.
* Observes flowmeters and turns valves to regulate flow of phosphoric acid and water to premixer as specified.
* Swings discharge spout over reaction vessel, and starts agitator in vessel to admit and mix product.
* Turns valve to regulate flow of steam through vessel heating coils to attain reaction, observing thermometer to verify required temperature.
* Lowers dipstick into tank to obtain sample for laboratory testing.
* Turns valves to add measured amounts of chemicals, as indicated by laboratory reports, to regulate chemical properties of mixture to specifications.
* Turns valves and starts pump to transfer finished mixture to spray drier feed tanks.
Industry:Professional careers
A professional who tends catalytic reactor that converts monovinylacetylene into unpolymerized constituent of neoprene rubber as directed by cd-reactor operator, head. Respnsibilities include:
* Moves equipment controls to start and shut down reactor components in sequence as directed.
* Gauges catalyst level in reactors and patrols area to record instrument readings in operating log.
* Collects and titrates samples of catalyst to facilitate process adjustments and production of product meeting specified standards.
* Starts pumps to discharge and recharge catalyst in reactors and calcium chloride in driers and scrubber towers.
* Drains and flushes process lines and equipment, using water, steam hoses, and nitrogen-sweeping equipment.
* Inventories supplies received and consumed.
Industry:Professional careers
A professional who tends equipment units that generate hydrogen chloride to facilitate process control by absorption operator. Respnsibilities include:
* Installs chlorine cylinders in chlorinating unit.
* Starts equipment and pumps to mix metered amount of chlorine with hydrochloric acid from absorption system and to transfer chlorinated acid to feed tanks of stripper still.
* Draws samples of product for laboratory analysis, or tests sample for specific gravity, acidity, and composition to maintain product specifications, using such instruments as hydrometer and pH meter.
* Maintains records of tank levels, gauge and instrument readings, and inventory of materials used and produced.
Industry:Professional careers
A professional who tends furnace, absorber, cooler, scrubber, and auxiliary equipment used in producing phosphoric acid by oxidation and hydration of elemental phosphorus. Respnsibilities include:
* Patrols work area; observes water levels in scrubber, venturi-duct pan, and cooling-tower basin; and reads flowmeter and pressure gauges on phosphorus pump, fans, and blower to verify process conditions.
* Records or calls readings to operator.
* Observes flow of cooling water over top and outer walls of furnace to ensure uniform distribution, and notifies operator of malfunction.
* Takes sample of cooling water for laboratory alkalinity test.
* Turns valves to transfer acid to specified storage tanks and to start and stop water sprays in absorber, as directed, to control acid strength.
* Removes and replaces screens and filters, using wrenches.
* Opens valves to flush phosphorus pump and water-treating equipment with steam and regenerative chemicals.
Industry:Professional careers
A professional who tends battery of electric cells (tanks having positive and negative poles) to dissociate chemical elements from solutions. Respnsibilities include:
* Examines poles and sides of cells for defects, such as corrosion or cracks, and notifies supervisory personnel of findings.
* Opens valves to fill cells with solutions, and moves controls to start electrolytic process.
* Observes gauges and indicators on panelboard; and moves controls to maintain specified pressure, temperature, amperage, and voltage in each cell.
* Presses button to actuate automatic measuring and gas-testing device, and observes gauges that indicate gas volume and dissociation of solution in each cell.
* Records data in operational log.
Industry:Professional careers
A professional who operates agitators (reaction vessels), vacuum-filtrate system, and allied equipment from instrumented control board to produce phosphoric acid by reaction of sulfuric acid with phosphate rock in continuous strong-acid process. Respnsibilities include:
* Monitors recording instruments, flowmeters, panel lights, and other indicators, and listens for warning signals to verify conformity of process conditions to plant standards.
* Starts automatic feed of phosphate rock, water, and sulfuric acid through reaction tanks, vacuum-filtrate system, and pumps.
* Turns knobs and screws on control board to regulate temperatures, weight, pressures, and flow of materials through system to effect prescribed reaction, according to knowledge of equipment and process.
* Draws samples of product at specified stages of process for laboratory analysis.
* Maintains log of gauge readings, shift production, and equipment malfunctions.
* Patrols area to inspect equipment for leaks and hazards, such as wear and pending malfunction.
Industry:Professional careers
