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Types of Heaters Steam Quaker Oats St. Joseph, MO

Types of Heaters Steam Quaker Oats St. Joseph, MO. Steam Heaters. Why use steam heaters How they work Types of steam unit heaters Advantages/disadvantages Start-up process for steam heating Process during heat treatment Post heat treatment follow-up procedures. Steam Heaters.

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Types of Heaters Steam Quaker Oats St. Joseph, MO

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  1. Types of Heaters Steam Quaker Oats St. Joseph, MO

  2. Steam Heaters • Why use steam heaters • How they work • Types of steam unit heaters • Advantages/disadvantages • Start-up process for steam heating • Process during heat treatment • Post heat treatment follow-up procedures

  3. Steam Heaters • Why use steam heaters • How they work • Types of steam unit heaters • Advantages/disadvantages • Start-up process for steam heating • Process during heat treatment • Post heat treatment follow-up procedures

  4. Why Heat Treat with Steam???? • Boiler in place • Boiler capacity • Heaters already in place

  5. How Steam Heaters Work... • Coils, fans, housing, dampers, traps, strainer, check valve, thermostats, etc. • Coils are heated by steam passing through them • Air is heated as fan pulls air up through heated coils • Fans aid in dispersion of heated air throughout area • To decrease heat: open damper • To increase heat: close damper

  6. Types of Steam Heaters • Portable units • Fixed units • Ceiling mounted • Floor mounted

  7. Portable Steam Heaters • Advantages • Can be used in areas where heat is slow to rise • Can be moved around where needed • Easy to clean and maintain • Disadvantages • Additional storage area • May get lost

  8. Fixed Steam Heaters • Ceiling mounted heaters • Maintain floor space • Smaller, considered space savers • Do not get damaged as easy • Harder to access for cleaning and maintenance • Ability to direct heat in all directions

  9. Fixed Steam Heaters • Floor mounted heaters • More heat at floor level initially • Easier to clean and maintain • Get damaged more easily • Generally larger than ceiling mounted units • Ability to shoot heated air in all directions

  10. Advantages of Steam Heaters • Hotter heat • Better control of steam heat if heaters are working properly • Open dampers if area gets overheated • Close dampers if area needs more heat • Cheaper than gas/electric • Steam provides much of the humidity (30-50%) necessary for wooden equipment (sifter boxes) • Safer than gas fired/electric heaters

  11. Disadvantages of Steam Heaters... • Boiler capacity-necessary steam pressure • Coils must be clean so they will heat efficiently • Maintenance of traps, steam pipes, valves, couplers, fans, motors, etc. • Employee safety concerns: burns • System may become water logged resulting in slow or ineffective heat-up

  12. Quaker Oats - St. Joseph, MO • Goal: Core temperature 130°F / 30 hrs • 6 heat-ups/year • Mar, May, July, Aug, Oct, Nov • Heat 3.5 million cubic feet • 145-150 steam heaters • various sizes • ceiling/floor mounted units • 3 gas fired heaters • Departmental prep checklists • Post heat follow-up procedures

  13. Pre-Heat Treatment ChecklistFor Steam Heating… • 2 week inspection prior to heat • inspect fan motors on heaters • check couplers • inspect coils • check traps • repair steam leaks • inspect unit heater coils • inspect condensate return lines • ensure system is ready for heat treatment

  14. Pre-Heat Treatment ChecklistFor Steam Heating... • Day of heat treatment • Increase boiler pressure to maximum capacity (25,000-30,000 pounds) • Set all heaters to manual mode • Set thermostats on unit heaters at 140°F • Ensure steam valves and return lines are open at heaters

  15. Pre-Heat Treatment ChecklistFor Steam Heating cont... • Turn on main header valves to get steam to unit heaters • Heat unit heater coils • Turn fans on to unit heaters • Set out thermometers

  16. Steam Heaters During Heat-Up... • Auto vs. manual mode • Heaters started in manual mode • Once temperatures heat up, positioned in auto mode if thermostats are working • 3 pipefitters per shift to monitor heat progress • Temperature readings every two hours • Maintain 130°F for 30 hours • Making repairs as necessary

  17. Steam Heaters During Heat-Up... • Slow Heat-Up • system may be waterlogged • check condensate return line • ensure steam valves are open • waterlogging will cause slow heat in all areas • ensure fan on heater is running if area(s) are cool • check unit heater coils for buildup if area(s) are cool • ensure openings to outside are closed

  18. Steam Heaters During Heat-Up... • Fast Heat-Up • use auto mode to shut heat off at desired temperatures • open up dampers with fan running • throttle steam back at heaters • shut heater fan off • reduce steam pressure if fast heat-up is noted in all areas

  19. Other Factors Affecting Heat Treatment Success... • Wind • Outside temperature • Rain • Openings to outside not properly sealed • Knowledge and/or preferences of pipefitters/maintenance personnel running the heat treatment

  20. Post Heat Follow-Up Includes... • Determine shutdown time • Shut boiler down two hours prior • Coast 2 hours • pickup thermometers • shut off header valves / unit heater valves • leave fans running for circulation • Departments open up for cool down **********

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