Hydronic questions

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Author:
DaMetz11
ID:
275042
Filename:
Hydronic questions
Updated:
2014-05-28 22:35:45
Tags:
Hydronic Steam
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Study Questions
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  1. The distance required between the bottom of the last steam carrying line and the boiler water line is known as the dry return
    False
  2. the line that supplies steam directly to the heating units is called dry steam
    False
  3. The Cutout pressure of an additive differential pressuretrol is set by adding the cut in setting to the cutout setting
    False
  4. a compound gage should never be installed on a low pressure steam boiler
    False
  5. the tee for the main vent should be placed 3' from the end of the last steam carrying main
    False
  6. a 6" to 10" long pipe nipple should be installed between the top of the tee and the main vent
    True
  7. The bottom of a steam header must be at least 12" above the boiler water line
    False
  8. Installed correctly, the discharge from a thermostatic steam trao is not subject to freeze up problems
    False
  9. under normal operation, air and condensate are discharged from a float and thermostatic strap through the same orifice
    False
  10. Thermodynamic steam traps operate due to the difference in the thermal energy or heat content between the steam and the condensate
    True
  11. A thermostatic steam trap discharges condensate as soon as it enters the trap
    False
  12. an inverted bucket steam trap should be installed if a larger amount of air must be quickly removed from a steam system
    False
  13. in a 2 pipe gravity return steam heating system, you should trap return lines that are flowing to a condensate receiver. this is because centrifugal pump is being used to return water to the boiler
    False
  14. When pressure in a vapor steam heating system is decreased, each pound of steam will occupy more space
    True
  15. thermodynamic steam traps are often used in sub atmospheric steam heating systems
    False
  16. A sub atmospheric steam heating system is so called because the pressure on the supply side, as well as the return side of the system, are usually operating below atmospheric pressure
    True
  17. Steam mains should be pitched in the direction of flow
    True
  18. Guides are not needed if a slip type expansion joint is installed in the system piping
    False
  19. Steam mains, piping, etc. that are tied into a dry return must utilize a steam trap 
    True
  20. piping serving radiation units on the second floor of a building may not be run on the ceiling of the floor below
    False
  21. the supply connections to a heating element may be made at the bottom, top or at the end of the inlet header
    True
  22. Unit heaters designed for overhead use can be hung from the supply piping 
    False
  23. Cast iron boilers are only manufactured in small sizes for residential use
    False
  24. The steam flow line may never be taken out of the steam equalizing pipe of a water column
    True
  25. water can be added to a boiler by use of an electric water feeder that can be added to the feeder low water fuel cutoff
    true
  26. A mechanical water feeder must be installed on a boiler that is supplied by a boiler feed pump 
    True
  27. Boiler horsepower is defined as a equivalent evaporation of 34.5lb of water per hour at a feedwater temperature of 32
    False
  28. packaged water tube boilers all follow one structure configuration in their design
    False
  29. in water tube boilers, tubes called downcomers allow warmer less dense water to travel up to the steam drum
    False
  30. A dry pipe must be used in the design of a boiler to insure the delivery of dry steam
    False
  31. there are 2 types of air heaters, tubular and regenerative
    True
  32. Low carbon steel is generally used in all high pressure water tube boilers

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