Essentials of Fire Fighting , 5 th Edition

1. Essentials of Fire Fighting, 5th Edition Chapter 14 — Fire Streams Firefighter I

2. Chapter 14 Lesson Goal • After completing this lesson, the student shall be able to effectively operate a solid stream nozzle, fog stream nozzle, and broken stream nozzle following the policies and procedures set forth by the authority having jurisdiction (AHJ). Firefighter I

3. Specific Objectives 1. List methods that are used with fire streams to reduce the heat from a fire and provide protection to firefighters and exposures. 2. Discuss the extinguishing properties of water. (Continued) Firefighter I

4. Specific Objectives 3. Describe friction loss. 4. Define water hammer. 5. Distinguish among characteristics of fire stream sizes. (Continued) Firefighter I

5. Specific Objectives 6. Discuss types of streams and nozzles. 7. Discuss handling handline nozzles. 8. Describe types of nozzle control valves. 9. List checks that should be included in nozzle inspections. (Continued) Firefighter I

6. Specific Objectives 10. Operate a solid-stream nozzle. (Skill Sheet 14-I-1) 11. Operate a fog-stream nozzle. (Skill Sheet 14-I-2) 12. Operate a broken-stream nozzle. (Skill Sheet 14-I-3) Firefighter I

7. DISCUSSION QUESTION What is a fire stream? Firefighter I

8. Methods to Reduce Heat and Provide Protection • Applying water or foam directly onto burning material to reduce its temperature • Applying water or foam over an open fire to reduce the temperature so firefighters can advance handlines • Reducing high atmospheric temperature (Continued) Firefighter I

9. Methods to Reduce Heat and Provide Protection • Dispersing hot smoke and fire gases from a heated area • Creating a water curtain to protect firefighters and property from heat • Creating a barrier between a fuel and a fire by covering the fuel with a foam blanket Firefighter I

10. How Water Extinguishes Fire • Primary way is cooling • Smothering by diluting or excluding oxygen Firefighter I

11. Heat Absorption • When heated to boiling point, water absorbs heat • Visible form of steam is called condensed steam • Components of heat absorption • Specific heat (Continued) Firefighter I

12. Heat Absorption • Latent heat of vaporization • Expansion capability • Effective extinguishment with water generally requires steam production (Continued) Firefighter I

13. Heat Absorption • Water absorbs more heat when converted to steam than when heated to boiling point Firefighter I

14. Characteristics of Water Valuable for Fire Extinguishment • Readily available, relatively inexpensive • Has greater heat-absorbing capacity than most other common agents • Water changing to steam requires large amount of heat • Can be applied in variety of ways Firefighter I

15. Friction Loss • That part of total pressure lost while forcing water through pipes, fittings, fire hose, and adapters (Continued) Firefighter I

16. Friction Loss • When water flows through hose, couplings, appliances, its molecules rub against insides, producing friction • Slows water flow, reduces its pressure (Continued) Firefighter I

17. Friction Loss • Loss of pressure in hoseline between pumper and nozzle is most common example • Measuring friction loss • Affected by velocity of water and characteristics of hose layouts (Continued) Firefighter I

18. Friction Loss • Generally, the smaller the hose diameter and longer the hose lay, the higher the friction loss at a given pressure, flow volume Firefighter I

19. Factors Increasing Friction Loss • Rough linings in fire hose • Damaged hose couplings • Kinks/sharp bends in hose • More adapters than necessary • Hoselines longer than necessary • Hose diameter too small for volume needed Firefighter I

20. DISCUSSION QUESTION What can be done to reduce friction loss during a fire ground operation? Firefighter I

21. Elevation Loss/Gain • Elevation — Position of nozzle above or below pumping apparatus • Elevation pressure — Gain/loss in hoseline pressure caused by gravity when there is difference in elevation (Continued) Firefighter I

22. Elevation Loss/Gain • Pressure loss — When nozzle is above fire pump • Pressure gain — When nozzle is below pump Courtesy of District Chief Chris E. Mickal, NOFD Photo Unit. Firefighter I

23. Water Hammer (Continued) Firefighter I

24. Water Hammer • When flow of water through fire hose or pipe is suddenly stopped, shock wave produced when moving water reaches end of hose and bounces back • Pressure surge referred to as water hammer (Continued) Firefighter I

25. Water Hammer • Sudden change in direction creates excessive pressures that can cause damage to water mains, plumbing, fire hose, hydrants, fire pumps • Can often be heard as distinct clank • To prevent when water flowing, close components slowly Firefighter I

26. Identifying Fire Streams • By size and type • Size = Volume of flowing per minute • Type = specific pattern/shape of water • Rate of discharge measured in gallons per minute (gpm) or liters per minute (L/min) Firefighter I

27. Fire Stream Classifications • Low-volume stream • Handline stream • Master stream Firefighter I

28. Fire Stream Considerations • Volume discharged determined by design of nozzle, pressure at nozzle • To be effective, stream must deliver volume of water sufficient to absorb heat faster than it is being generated (Continued) Firefighter I

29. Fire Stream Considerations • Type of fire stream indicates specific pattern/shape of water stream • Requirements of effective streams • Requirements of all streams Firefighter I

30. Solid Stream • Produced from fixed orifice, solid-bore nozzle • Has ability to reach areas others might not; reach affected by several factors • Design capabilities (Continued) Firefighter I

31. Solid Stream • Velocity of stream a result of nozzle pressure • Nozzle pressure, size of discharge opening determine flow • Characteristics of effective fire streams • Flow rate Firefighter I

32. Advantages of Solid Streams • May maintain better interior visibility than others • May have greater reach than others • Operate at reduced nozzle pressures per gallon (liter) than others • May be easier to maneuver (Continued) Firefighter I

33. Advantages of Solid Streams • Have greater penetration power • Less likely to disturb normal thermal layering of heat, gases during interior structural attacks • Less prone to clogging with debris (Continued) Firefighter I

34. Advantages of Solid Streams • Produce less steam conversion than fog nozzles • Can be used to apply compressed-air foam Firefighter I

35. Disadvantages of Solid Streams • Do not allow for different stream pattern selections • Provide less heat absorption per gallon (liter) delivered than others • Hoselines more easily kinked at corners, obstructions Firefighter I

36. DISCUSSION QUESTION What type of fire situation would be ideal for a solid-stream nozzle? Firefighter I

37. Fog Stream • Fine spray composed of tiny water droplets • Design of most fog nozzles permits adjustment of tip to produce different stream patterns (Continued) Firefighter I

38. Fog Stream • Water droplets formed to expose maximum water surface for heat absorption • Desired performance of fog stream nozzles judged by amount of heat that fog stream absorbs and rate by which the water is converted into steam/vapor (Continued) Firefighter I

39. Fog Stream • Nozzles permit settings of straight stream, narrow-angle fog, and wide-angle fog • Nozzles should be operated at designed nozzle pressure (Continued) Firefighter I

40. Fog Stream • Several factors affect reach of fog stream • Interaction of these factors on fog stream results in fire stream with less reach than that of straight or solid stream (Continued) Firefighter I

41. Fog Stream • Shorter reach makes fog streams less useful for outside, defensive fire fighting operations • Well suited for fighting interior fires Firefighter I

42. Fog Stream: Waterflow Adjustment • Two types of nozzles control rate of water flow through fog nozzle • Manually adjustable nozzles • Automatic nozzles Firefighter I

43. DISCUSSION QUESTION How should adjustments to the rate of flow be made? Firefighter I

44. Fog Stream: Nozzle Pressure • Combination nozzles designed to operate at different pressures • Designated operating pressure for most combination nozzles is 100 psi (700 kPa) (Continued) Firefighter I

45. Fog Stream: Nozzle Pressure • Nozzles with other designated operating pressures available • Setbacks of nozzles with lower operating pressures Courtesy of Elkhart Brass Manufacturing Company. Firefighter I

46. Advantages of Fog Streams • Discharge pattern can be adjusted for situation • Can aid ventilation • Reduce heat by exposing maximum water surface for heat absorption • Wide fog pattern provides protection to firefighters Firefighter I

47. DISCUSSION QUESTION What type of fire situation would be ideal for a fog-stream nozzle? Firefighter I

48. Disadvantages of Fog Streams • Do not have as much reach/penetrating power as solid streams • More affected by wind than solid streams • May disturb thermal layering • May push air into fire area, intensifying the fire Firefighter I

49. Broken Stream • One that has been broken into coarsely divided drops • While solid stream may become broken stream past point of breakover, true broken stream takes on that form as it leaves nozzle Firefighter I

50. Advantages of Broken Streams • Absorb more heat per gallon (liter) than solid stream • Have greater reach, penetration than fog stream • Can be effective on fires in confined spaces Firefighter I