1 / 99

PREINCIDNET PREPARATION

PREINCIDNET PREPARATION. Properly calculate required fire flow for structures using the National Fire Academy Fire Flow Formula. FIRE FLOW REQUIREMENTS FIRE FLOW FORMULA. OBJECTIVES. Module 5 Overview. Given the required fire flow for a structure, estimate the personnel

wren
Download Presentation

PREINCIDNET PREPARATION

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PREINCIDNET PREPARATION

  2. Properly calculate required fire flow for structures using the National Fire Academy Fire Flow Formula. FIRE FLOW REQUIREMENTS FIRE FLOW FORMULA OBJECTIVES Module 5 Overview

  3. Given the required fire flow for a structure, estimate the personnel required for offensive operations. RESOURCE CAPABILITY AND DISTRIBUTION DATA OBJECTIVES Module 5 Overview

  4. Given a scenario, properly complete a National Fire Academy Quick Access Prefire Plan QUICK ACCESS PREFIRE PLANNING OBJECTIVES Module 5 Overview

  5. FIRE FLOW REQUIREMENTS • Fires extinguished by absorbing the heat with water • Application of water will: • Absorb heat • Reduce temperature • Extinguish fire

  6. FIRE FLOW REQUIREMENTS To extinguish a fire , the quantity of water (gpm) must exceed the heat (Btu’s) being produced.

  7. FIRE FLOW FORMULAQUICK CALCULATION Basic Formula: Length x Width = GPM 3

  8. CALAULATES THEORETICAL FIRE FLOW • Large amounts of heat absorbed • Reduces temperature below ignition temperature • Fire is “blacked-out” ready for overhaul

  9. WITH HIGH PERCENTAGES OF INVOLVEMENT INTERIOR OPERATIONS ARE NOT POSSIBLE • 100% involvement answer is theoretical • Starting point for realistic flow rate • Starting point for defensive operations • Tactical operations must be evaluated

  10. ORIGIN OF FORMULA Empirical formula developed by NFA development team. Study of fire flow at fire situations

  11. BASIC FORMULA Basic Formula: L x W = GPM 3 Flow for one floor fully involved. Estimate Length/Width to nearest 10 feet. Multiply L x W then divide by 3. Theoretical fire flow for 100% involvement.

  12. Insert 1 story 40’x 30’ structure- no fire 30 X 40

  13. BASIC FORMULA • Quick calculations at the scene • Calculates water required for: • Confinement, Extinguishment, Back-up lines

  14. Insert 50’ x 30’ building with dimensions on slide 50x30

  15. MULTIPLE STORIES Multiply base fire floor by number of floors

  16. Insert 2 story house (50 ft X 30 ft /3) x 2 = FULLY INVOLVED = 1000 GPM 50% INVOLVED = 500 GPM 25 % INVOLVED = 250 GPM

  17. EXPOSURES GPM = LENGTH X WIDTH + EXPOSURES 3

  18. WATER FOR EXPOSURE PROTECTION • Interior exposures - floors above the fire on “fire-resistive” construction • Exterior exposures - buildings or other objects

  19. EXPOSURE PROTECTION • Up to 4 floors above the fire • Buildings or other objects • 0 to 30’ -- usually an exposure • 30’ to 100’ -- could be an exposure • 100’ or more -- usually not an exposure

  20. You must make the final determination of exposure based on observed conditions

  21. EXPOSURE PROTECTION • Fire area adjacent to a fire wall • Should the exposure become involved - calculate flow as new fire building

  22. EXPOSURE PROTECTION Exposure “C” 25% Exposure “B” Fire Exposure “D” 25% Building 25% Exposure “A” 25%

  23. Exposure Fire Building Exposure “B” “D” Base Flow = 1000 GPM Exposure “B” = 250 GPM (25%) Exposure “D” = 250 GPM (25%)

  24. INTERIOR EXPOSURE( Fire Resistive Structure) 5 EXPOSURE 25% 4 EXPOSURE 25% 3 EXPOSURE 25% 2 EXPOSURE 25% 1 FIRE FLOOR

  25. 25% Exposure “B” 250 gpm 25% Exposure “D” 250 gpm EXPOSURE PROTECTION “Fire Resistive” Structure 3 Exposure 250 gpm (25%) 2 Exposure 250 gpm (25%) 1 Fire Floor Total Fire Flow = 1000 GPM Total Exposure Flow = 1000 GPM Total Flow Required = 2000 GPM

  26. PERCENTAGE OF INVOLVEMENT GPM = L x W + EXPOSURE x PERCENT OF INVOLVEMENT 3

  27. PERCENTAGE OF INVOLVEMENT Fire Building Exposure “D” 1000 GPM 250 GPM (25%) 100% Involvement = 1250 GPM 75% Involvement = 950 GPM (1250 x .75) 50% Involvement = 625 GPM (1250 x .50) 25% Involvement = 325 GPM (1235 x .25)

  28. Individual Activity 5.1 Fire Flow Calculation

  29. 15’ 20’ Fire building is 30’x 50’ Exposure B 15’ Fire Building 20’ Exposure D

  30. RESOURCE CAPABILITY AND DISTRIBUTION DATA

  31. KNOW INITIAL ATTACK CAPABILITY • Measured in terms of ability to flow GPM • If fire flow requirements exceed resources, get help

  32. RESOURCE CAPABILITY AND DISTRIBUTION DATA • Capability/Distribution evaluation parameters • Requires an aggressive interior fire attack

  33. INTERIOR FIRE ATTACK FLOW RATES AND PERSONNEL REQUIRED Hose size Flow Rates Personnel/Lines 1-1/2” 100 gpm 2 1-1/2” 150 gpm 2 1-3/4” 150 gpm 2 2” 240 gpm 3 2-1/2” 300 gpm 4+

  34. FOUR MAJOR FUNCTIONS ON THE INCIDNET SCENE • COMMAND • VENTILATION • SEARCH • FIRE CONTROL

  35. Insert building fire 40’ x 90’ slab foundation “Distribution at simple incidents”

  36. FIRE INVOLVEMENT 1-story structure 40 x 90 (3600 Sq. Ft) built on a slab 25% involvement, no exposures gpm = 300

  37. Personnel Requirement Incident Commander 1 Ventilation 2 Primary Search/Fire Attack/ Pump Operation 7 Total Personnel Required 10

  38. Distribution at complex incident Insert 2 story building fire - lot’s of fire-Titled- distribution at complex incident 60 X 60

  39. FIRE INVOLVEMENT 2-story structure 60 x 60 (3600 Sq. Ft) built on a slab 25% involvement, 1 second floor exposure gpm = 600

  40. Incident Commander 1 1st and 2nd Floor Supervisors 2 Ventilation 4 Primary Search/Fire Attack/ Pump Operation 4- 1-3/4” lines 12 Total Personnel Required 19

  41. CONCLUSION gpm divided by personnel = gpm per person 300 gpm divided by 10 persons = 30 gpm per person

  42. CONCLUSION gpm divided by personnel = gpm per person 600 gpm divided by 19 persons = 31.5 gpm per person

  43. ANALYSIS The average fire flow on the incident scene in the United States ranges between 25 and 50 gpm per person engaged in fire control efforts, as stated in the charts above.

  44. ANALYSIS If the fire flow is below 25 gpm/person, you are probably using 1 1/2” hose. Consider switching to 1 3/4” hose; or, you have counted people who are not doing any of the jobs (reserves).

  45. ANALYSIS If the fire flow is greater than 50 gpm/person, you either have too few people doing ventilation and primary search; or you are using too few people on each hoseline. NO master streams allowed during interior attack.

  46. PROACTIVE USE OF THE DATA Have each unit that responds report the number of personnel on board. Multiply your department’s average flow per person to get your total capability responding to this alarm.

  47. PROACTIVE USE OF THE DATA What total flow for 10 personnel? What total flow for 15 personnel? What total flow for 20 personnel?

  48. INTERIOR FIRE ATTACK AND PERSONNEL REQUIRED Hose size Flow Rates Personnel/Line 1-1/2” 100 gpm 2 1-3/4” 150 gpm 2 2” 150 gpm 2 1-3/4” 240 gpm 3 2” 240 gpm 3 2-1/2” 300 gpm 4+

  49. Large Group Activity 5.2: Personnel Capability and Distribution Data

  50. Insert 1 story building, 50’ x 90’ approx 25% involved

More Related