Tactical Firefighting

Total Page:16

File Type:pdf, Size:1020Kb

Tactical Firefighting TACTICAL FIREFIGHTING A COMPREHENSIVE GUIDE TO COMPARTMENT FIREFIGHTING & LIVE FIRE TRAINING (CFBT) P. Grimwood K. Desmet Version 1.1 UNCLASSIFIED TF-1.1 Keywords : Firefighter Protective Clothing, Burns, CFBT, 3Dfog, Tactical firefighting, Tactical ventilation, Live Fire Training Title page photograph : Ian Roberts – Manchester Airport, UK, 2003 Firetactics www.firetactics.com - [email protected] Crisis & Emergency Management Centre www.crisis.be - www.cemac.org - [email protected] © 2003, Firetactics, Cemac All rights, reserved, including the right of reproduction, in whole or in part, in any form. No part of this publication may be used in a commercial context. The reproduction of this document, or any part, is authorised, for internal distribution or training, as long as reference is made to the original document. Despite the care given to this document, neither the author nor the publisher can be held liable for damages caused directly or indirectly through the advice and information contained in this docu- ment. Firetactics – www.firetactics.com CEMAC - www.cemac.org - 2 - Tactical Firefighting – A comprehensive guide... v1.1 - jan 2003 TACTICAL FIREFIGHTING u n c l a s s i f i e d TF-1.1 Paul Grimwood served 26 years as a professional firefighter, mostly within the busy inner-city area of London's west-end. He has also served in the West Midlands and Merseyside Brigades (UK) as well as lengthy detachments to the fire departments of New York City, Boston, Chicago, Los Angeles, San Francisco, Las Vegas, Phoenix, Miami, Dallas, Metro Dade Florida, Seattle, Paris, Valencia, Stockholm and Amsterdam. During the mid 1970s he served as a Long Island volunteer firefighter in New York State USA. His research into international firefighting strategy & tactics spans three decades and has resulted in over 80 published technical research papers and a book – FOG ATTACK (1992). In 1989 Paul Grimwood defined and introduced the concept of tactical fire- fighting as a means of bringing together a wide range of tactical options on the fireground. He also re-defined some already established techniques and procedures, as well as promoting research into various ‘new-wave’ methods being developed including 3D water-fog; PPV and CAFS. His proposal for a basic standard operating procedure (SOP) for first responders that prioritised tactical objec- tives in various situations was first published in 1992. This SOP was formulated with three things in mind – 1. A review into the causes of previous firefighter Line of Duty Deaths (LODD) 2. Ensuring that the wide range of tactical options are applied without conflict 3. Emphasising the ‘safe-person’ concept inline with recognised ‘risk-based’ assessment Koen Desmet is an active volunteer firefighter – rescue diver in Belgium. He has an academic degree in chemistry and holds the title of safety advisor (lev. 1). He recently finished the fire offi- cer’s course. Currently he is working as a researcher at the University of Ghent, Belgium. His research concerns the chemical analysis of gases formed during fire using laboratory combustion tests. He is also a ‘working’ member of Cemac public services, a not-for-profit organisation, which ad- vises and aids emergency services and other government organisations. Firetactics – www.firetactics.com CEMAC - www.cemac.org - 3 - Tactical Firefighting – A comprehensive guide... v1.1 - jan 2003 TACTICAL FIREFIGHTING u n c l a s s i f i e d TF-1.1 THE QUEST The Assistant Chief Fire Officer stared me in the eyes………’Do you honestly believe fire- fighters actually take the time to read this stuff you write’? I raised an eyebrow to this remark. It made me pause and think before answering. ‘Yes sir, I really do believe there are some that have a strong desire to enhance their knowledge – to make themselves better firefighters’. He laughed………’I wish I could share in your enthusiasm Paul but I honestly don’t think they do’. London 1993 ‘The lessons of others are here for you to learn’………I said this in 1992 [4] and I say it again now. If only some of those who have died since then had read these words………acted upon the advice………learned to recognise dangerous conditions and circumstances………I dedicate this book to all those brave souls and can only hope that someone, somewhere, uses this advice to good ends in future. London 2003 Paul GRIMWOOD Firetactics – www.firetactics.com CEMAC - www.cemac.org - 4 - Tactical Firefighting – A comprehensive guide... v1.1 - jan 2003 TACTICAL FIREFIGHTING u n c l a s s i f i e d TF-1.1 I. ADAPTATIONS MADE DATE ADAPTATION BY 23/01/03 Lay-out correction K.D. Firetactics – www.firetactics.com CEMAC - www.cemac.org - 5 - Tactical Firefighting – A comprehensive guide... v1.1 - jan 2003 TACTICAL FIREFIGHTING u n c l a s s i f i e d TF-1.1 II. CONTENT I. ADAPTATIONS MADE __________________________________________________5 II. CONTENT __________________________________________________________6 III. ABREVIATIONS _____________________________________________________8 IV. INTRODUCTION ____________________________________________________10 V. THE BASICS OF FIRE FIGHTING ________________________________________12 Fire explained ________________________________________________________12 Explosions ___________________________________________________________18 Fire growth __________________________________________________________22 Fire classes __________________________________________________________26 VI. PERSONAL PROTECTIVE FIREFIGHTING GEAR ____________________________28 Structural firefighting gear ______________________________________________28 Fire fighting gloves ____________________________________________________38 Comparison of NFPA and EN fire protective clothing standards___________________40 VII. COMPARTMENT FIRE BEHAVIOR TRAINING ______________________________45 CFBT simulator safety __________________________________________________49 Recent CFD research into fire simulators is flawed ____________________________52 The transition of CFBT to working structural fires _____________________________54 VIII. RAPID FIRE PROGRESS_____________________________________________57 Flashover____________________________________________________________61 Flashover case histories ________________________________________________62 Backdraft____________________________________________________________63 Backdraft case histories_________________________________________________64 Fire gas ignitions ______________________________________________________67 Fire gas ignitions case histories___________________________________________71 Website poll__________________________________________________________75 Step & transient events_________________________________________________77 Firefighter's actions & warning signs _______________________________________78 The under-ventilated fire________________________________________________81 Flashover Phenomena – Questions & answers – Revision Aid ____________________86 IX. ‘NEW-WAVE’ 3D WATER-FOG IN FIREFIGHTING ___________________________92 Flashover____________________________________________________________94 Firetactics – www.firetactics.com CEMAC - www.cemac.org - 6 - Tactical Firefighting – A comprehensive guide... v1.1 - jan 2003 TACTICAL FIREFIGHTING u n c l a s s i f i e d TF-1.1 3D water fog-applications _______________________________________________94 False assumptions _____________________________________________________96 3D Offensive fog attack (Gas cooling)______________________________________98 Indirect (defensive) water-fog combination attack ___________________________100 Direct attack ________________________________________________________103 Direct attack ________________________________________________________104 Interaction of water sprays with flames and gases ___________________________105 Scandinavian research_________________________________________________108 Benefits of 3D water-fog applications _____________________________________110 Flow-rates __________________________________________________________111 X. TACTICAL VENTILATION _____________________________________________113 Natural ventilation____________________________________________________114 Positive pressure ventilation ____________________________________________116 Fire isolation (confinement) tactics (anti-ventilation) _________________________117 Ventilation in practice _________________________________________________118 XI. TECHNICAL JARGON _______________________________________________120 XII. REFERENCES ____________________________________________________126 Firetactics – www.firetactics.com CEMAC - www.cemac.org - 7 - Tactical Firefighting – A comprehensive guide... v1.1 - jan 2003 TACTICAL FIREFIGHTING u n c l a s s i f i e d TF-1.1 III. ABREVIATIONS A A Alfa ACT Australian Capital Territory AIT Auto-ignition temperature B B Bravo C C Charlie CAFS Compressed Air Foam System CFBT Compartment Fire Behaviour Training CFD Computational Fluid Dynamics D D Delta 3D Three-dimensional E E Echo F F Foxtrot FGI Fire gas ignition G G Golf H H Hotel HRR Heat release rate HVG High velocity gases I I India J J Julliet K K Kilo L L Lima LEL Lower explosion limit M M Mike Firetactics – www.firetactics.com CEMAC - www.cemac.org - 8 - Tactical Firefighting – A comprehensive guide... v1.1 - jan 2003 TACTICAL FIREFIGHTING u n c l a s s i f i e d TF-1.1 N N November NSSC Naval Sea Systems Command NPP Neutral pressure plane O O Oscar P P Papa PPE Personal protective equipment Q Q Quebec R R Romeo RFP Rapid fire progress
Recommended publications
  • The Art of Reading Smoke for Rapid Decision Making
    The Art of Reading Smoke for Rapid Decision Making Dave Dodson teaches the art of reading smoke. This is an important skill since fighting fires in the year 2006 and beyond will be unlike the fires we fought in the 1900’s. Composites, lightweight construction, engineered structures, and unusual fuels will cause hostile fires to burn hotter, faster, and less predictable. Concept #1: “Smoke” is FUEL! Firefighters use the term “smoke” when addressing the solids, aerosols, and gases being produced by the hostile fire. Soot, dust, and fibers make up the solids. Aerosols are suspended liquids such as water, trace acids, and hydrocarbons (oil). Gases are numerous in smoke – mass quantities of Carbon Monoxide lead the list. Concept #2: The Fuels have changed: The contents and structural elements being burned are of LOWER MASS than previous decades. These materials are also more synthetic than ever. Concept #3: The Fuels have triggers There are “Triggers” for Hostile Fire Events. Flash point triggers a smoke explosion. Fire Point triggers rapid fire spread, ignition temperature triggers auto ignition, Backdraft, and Flashover. Hostile fire events (know the warning signs): Flashover: The classic American Version of a Flashover is the simultaneous ignition of fuels within a compartment due to reflective radiant heat – the “box” is heat saturated and can’t absorb any more. The British use the term Flashover to describe any ignition of the smoke cloud within a structure. Signs: Turbulent smoke, rollover, and auto-ignition outside the box. Backdraft: A “true” backdraft occurs when oxygen is introduced into an O2 deficient environment that is charged with gases (pressurized) at or above their ignition temperature.
    [Show full text]
  • Fire Extinguisher Booklet
    NY Fire Consultants, Inc. NY Fire Safety Institute 481 Eighth Avenue, Suite 618 New York, NY 10001 (212) 239 9051 (212) 239 9052 fax Fire Extinguisher Training The Fire Triangle In order to understand how fire extinguishers work, you need to understand some characteristics of fire. Four things must be present at the same time in order to produce fire: 1. Enough oxygen to sustain combustion, 2. Enough heat to raise the material to its ignition temperature, 3. Some sort of fuel or combustible material, and 4. The chemical, exothermic reaction that is fire. Oxygen, heat, and fuel are frequently referred to as the "fire triangle." Add in the fourth element, the chemical reaction, and you actually have a fire "tetrahedron." The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished. Essentially, fire extinguishers put out fire by taking away one or more elements of the fire triangle/tetrahedron. Fire safety, at its most basic, is based upon the principle of keeping fuel sources and ignition sources separate Not all fires are the same, and they are classified according to the type of fuel that is burning. If you use the wrong type of fire extinguisher on the wrong class of fire, you can, in fact, make matters worse. It is therefore very important to understand the four different fire classifications. Class A - Wood, paper, cloth, trash, plastics Solid combustible materials that are not metals. (Class A fires generally leave an Ash.) Class B - Flammable liquids: gasoline, oil, grease, acetone Any non-metal in a liquid state, on fire.
    [Show full text]
  • Respirator Usage by Wildland Firefighters
    United States Department of Agriculture Fire Forest Service Management National Technology & Development Program March 2007 Tech Tips 5200 0751 1301—SDTDC Respirator Usage by Wildland Firefighters David V. Haston, P.E., Mechanical Engineer Tech Tip Highlights ß Based on a 7-year comprehensive study by the National Wildfire Coordinating Group (NWCG), a 1997 consensus conference concluded that routine use of air purifying respirators (APRs) should not be required. ß APRs provide protection against some, but not all harmful components of wood smoke, and may expose firefighters to higher levels of unfiltered contaminants, such as carbon monoxide. In addition, APRs do not protect firefighters against superheated gases and do not supply oxygen. ß Firefighters may use APRs on a voluntary basis if certain conditions are met. Introduction All firefighters, fire management officers, and safety personnel should understand the issues related to using air purifying respirators (APRs) in the wildland firefighting environment. This Tech Tip is intended to provide information regarding the regulatory requirements for using APRs, how APRs function, and the benefits and risks associated with their use. Respirator Types and Approvals Respirators are tested and approved by the National Institute for Occupational Safety and Health (NIOSH) in accordance with 42 CFR Part 84 (Approval of Respiratory Protection Devices). Respirators fall into two broad classifications: APRs that filter ambient air, and atmosphere-supplying respirators that supply clean air from another source, such as self-contained breathing apparatus (SCBA). APRs include dust masks, mouthpiece respirators (used for escape only), half- and full-facepiece respirators, gas masks, and powered APRs. They use filters or cartridges that remove harmful contaminants when air is passed through the air-purifying element.
    [Show full text]
  • Fire Service Features of Buildings and Fire Protection Systems
    Fire Service Features of Buildings and Fire Protection Systems OSHA 3256-09R 2015 Occupational Safety and Health Act of 1970 “To assure safe and healthful working conditions for working men and women; by authorizing enforcement of the standards developed under the Act; by assisting and encouraging the States in their efforts to assure safe and healthful working conditions; by providing for research, information, education, and training in the field of occupational safety and health.” This publication provides a general overview of a particular standards- related topic. This publication does not alter or determine compliance responsibilities which are set forth in OSHA standards and the Occupational Safety and Health Act. Moreover, because interpretations and enforcement policy may change over time, for additional guidance on OSHA compliance requirements the reader should consult current administrative interpretations and decisions by the Occupational Safety and Health Review Commission and the courts. Material contained in this publication is in the public domain and may be reproduced, fully or partially, without permission. Source credit is requested but not required. This information will be made available to sensory-impaired individuals upon request. Voice phone: (202) 693-1999; teletypewriter (TTY) number: 1-877-889-5627. This guidance document is not a standard or regulation, and it creates no new legal obligations. It contains recommendations as well as descriptions of mandatory safety and health standards. The recommendations are advisory in nature, informational in content, and are intended to assist employers in providing a safe and healthful workplace. The Occupational Safety and Health Act requires employers to comply with safety and health standards and regulations promulgated by OSHA or by a state with an OSHA-approved state plan.
    [Show full text]
  • Lofer Fire and Flash Fire Update 09-08-20
    UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF INDIAN AFFAIRS Fort Apache Agency P.O. Box 560 Whiteriver, Arizona 85941 Bureau of Indian Affairs, Wildland Fire Management News Release Phone line: (928)421-4984 Email: [email protected] Lofer Fire and Flash Fire Update for September 08, 2020 Lofer Fire Summary Location: 15 miles east of Whiteriver Containment: 50% Fire Cause: Lightning Fuel Type: Timber, brush, litter Fire Size: 1,256 acres Resources: 133 incident personnel Lofer Fire: Yesterday afternoon, crews carried out firing operations along the K.L. Ridge which allowed firefighters to strengthen containment lines and promote a low intensity backing fire down Big Bonito Creek. Firefighters have begun to restore areas disturbed by containment and suppression efforts. This is being done to limit erosion along fire lines as well as to enhance the aesthetics of the landscape. Today, crews will be assessing if there is an additional need for firing operations while other resources will continue with suppression repair efforts. There will be a local type 3 organization transitioning tomorrow evening for the Lofer and Flash Fires. As containment continues to increase and fire activity decreases, the updates for the fire will only be posted to the BIA Forestry & Wildland Fire Management – Fort Apache Agency if there are any significant changes. Flash Fire: The Flash Fire is 51 acres in size and approximately 90 percent contained. Values and Objectives: Safety of incident responders and the public remains the number one priority. Incident personnel will continue to protect traditional gathering sites, recreation areas, the Mount Baldy Wilderness, commercial timberlands and watersheds, and continue to protect riparian areas to the Apache trout.
    [Show full text]
  • Wildland Fire Incident Management Field Guide
    A publication of the National Wildfire Coordinating Group Wildland Fire Incident Management Field Guide PMS 210 April 2013 Wildland Fire Incident Management Field Guide April 2013 PMS 210 Sponsored for NWCG publication by the NWCG Operations and Workforce Development Committee. Comments regarding the content of this product should be directed to the Operations and Workforce Development Committee, contact and other information about this committee is located on the NWCG Web site at http://www.nwcg.gov. Questions and comments may also be emailed to [email protected]. This product is available electronically from the NWCG Web site at http://www.nwcg.gov. Previous editions: this product replaces PMS 410-1, Fireline Handbook, NWCG Handbook 3, March 2004. The National Wildfire Coordinating Group (NWCG) has approved the contents of this product for the guidance of its member agencies and is not responsible for the interpretation or use of this information by anyone else. NWCG’s intent is to specifically identify all copyrighted content used in NWCG products. All other NWCG information is in the public domain. Use of public domain information, including copying, is permitted. Use of NWCG information within another document is permitted, if NWCG information is accurately credited to the NWCG. The NWCG logo may not be used except on NWCG-authorized information. “National Wildfire Coordinating Group,” “NWCG,” and the NWCG logo are trademarks of the National Wildfire Coordinating Group. The use of trade, firm, or corporation names or trademarks in this product is for the information and convenience of the reader and does not constitute an endorsement by the National Wildfire Coordinating Group or its member agencies of any product or service to the exclusion of others that may be suitable.
    [Show full text]
  • AREVA Design Control Document Rev. 1
    U.S. EPR FINAL SAFETY ANALYSIS REPORT 9.5 Other Auxiliary Systems 9.5.1 Fire Protection System The purpose of the fire protection system (FPS) is to protect other plant systems and equipment which provide the capability to safely shut down the reactor, maintain it in a safe shutdown condition, control radioactive releases to the environment, and to prevent personnel injury and property damage in the event of a fire. The FPS consists of design features, personnel, equipment, and procedures to provide defense-in-depth protection of public health and safety. The program is implemented during station operations by the prevention, detection, annunciation, confinement, and extinguishment of fire. Administrative controls, training, inspection, testing, and quality assurance (QA) provide reasonable assurance of the operability of the program. The FPS, including administrative controls and the fire brigade, are implemented prior to receiving fuel on site for fuel storage areas and for the entire station prior to reactor startup. 9.5.1.1 Design Basis The FPS is designed in accordance with: ● 10 CFR 50.48 - Fire Protection. ● 10 CFR Part 50, Appendix A, GDC 3 - Fire Protection. ● 10 CFR Part 50, Appendix A, GDC 5 - Sharing of Structures, Systems, and Components. ● 10 CFR Part 50, Appendix A, GDC 19 - Control Room. ● 10 CFR Part 50, Appendix A, GDC 23 - Protection System Failure Modes. ● 10 CFR Part 50, Appendix A, GDC 56 - Primary Containment Isolation. ● NUREG-0800, Standard Review Plan 9.5.1 - Fire Protection Program (Reference 37). ● RG 1.29 - Seismic Design Classification, Revision 4. ● RG 1.189 - Fire Protection for Nuclear Power Plants, Revision 1.
    [Show full text]
  • E-CATALOGUE Download
    2 3 OUR COMMITMENT "To provide our customers with the best possible service, the highest quality products and the right solution for their needs" Fire Protection Technologiesis the largest Our aim is to provide design driven independent supplier of product, design solutions and to educate our customers and engineering services in Australia, New on their options including advantages and Zealand and Asia Pacific. In conjunction with disadvantages enabling our customer to our ‘whole of life’ approach to our product make an informed decision on what product range, technical support, design and best serves and meets their needs. engineering solutions available throughout all stages of a project from development Technical support, design and engineering to delivery, we will continue to provide assistance will be available for the life of the ongoing support for the life of the product. product; our staff and product managers regularly attend product training with all our Wholly Australian owned and operated we manufacturers enabling us to maintain the have a team dedicated to customer support, highest level of up to date local support and complete with 350+ years combined technical assistance. practical experience in delivery and engineering of special hazards projects. With offices and warehouses in Melbourne (Head Office), Sydney, Brisbane, Perth, Being the sole distributor in this region for Auckland and Singapore, including regional some of the world’s largest and technically managers for South Australia, Tasmania, advanced product manufacturers, together Northern Territory and Malaysia. We with our technical capabilities enables us continue to grow throughout the Asia Pacific to provide the highest quality products region.
    [Show full text]
  • M E M O R a N D U M
    M E M O R A N D U M TO: Technical Committee on Gaseous Fire Extinguishing Systems FROM: Barry Chase, Staff Liaison DATE: March 20, 2019 SUBJECT: NFPA 12/12A/2001 First Draft Meeting Agenda (F2020) April 24-26, 2019, Memphis, TN 1. Call to Order – April 24, 2019, 8:00am ET 2. Chair’s comments 3. Previous minutes [April 25, 2017, Linthicum Heights, MD] 4. NFPA Staff Liaison Presentation a. NFPA Standards Development Process b. NFPA Resources 5. NFPA 2001 First Draft a. Public input [see attached] b. Report of the Task Group on Total Flooding Design Concentration Requirements (5.4.2) [P. Rivers] c. Presentation on Halocarbon Blend 55 (related to PI 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 58, 60) [Robert Richard – Honeywell] d. April 25, 8:00AM - Presentation on Toxicity of Halocarbon Impurities (related to PI 74) [Kurt Werner, Government and Regulatory Affairs Manager, 3M Electronics Materials Solutions Division] e. April 25, 9:00AM - Presentation on Toxicity of Halocarbon Impurities [Steve Hodges, Alion Science and Technology] f. Committee revisions g. Staff notes and editorial issues 6. NFPA 12 First Draft a. Public input [see attached] b. Report of the Task Group on Low Pressure Containers (4.6.6.1.1) [K. Adrian] c. Committee revisions d. Staff notes and editorial issues 7. NFPA 12A First Draft a. Public input [see attached] b. Committee revisions c. Staff notes and editorial issues 8. Other business 9. Next meeting location and dates 1 of 371 All NFPA Technical Committee meetings are open to the public.
    [Show full text]
  • Use of Gaseous Suppression Systems in High Air Flow Environments – Phase 1 FINAL REPORT
    Use of Gaseous Suppression Systems in High Air Flow Environments – Phase 1 FINAL REPORT PREPARED BY: Eric Forssell Jensen Hughes Baltimore, MD, USA © September 2015 Fire Protection Research Foundation FIRE PROTECTION RESEARCH FOUNDATION ONE BATTERMARCH PARK | QUINCY, MASSACHUSETTS, USA 02169-7471 E-MAIL: [email protected] | WEB: WWW.NFPA.ORG/FOUNDATION — — Page ii — — FOREWORD Information-technology and telecommunications (IT/telecom) facilities provide critical services in today’s world. From a risk standpoint, the indirect impact of fire loss due to business interruption and loss of critical operations, sometimes geographically very distant from the IT/telecom facility itself, can far outweigh the direct property loss. In the past few years, there have been dramatic changes in the equipment housed in these facilities, which have placed increased demands on HVAC systems. As a result, engineered-airflow containment solutions are being introduced to enhance heat extraction and increase energy efficiency. From the perspective of fire-suppression system design, the use of airflow containment systems creates areas of high-air velocities within an increasingly obstructed equipment space, which could affect the effectiveness of transport of suppression agents throughout the protected volume. Requirements related to use of gaseous-agent fire extinguishing systems in IT/telecom facilities are directly addressed by NFPA 75, Standard for the Fire Protection of Information Technology Equipment, and NFPA 76, Standard for the Fire Protection of Telecommunications Facilities. NFPA 75, 2013 edition, addresses these issues related to gaseous agent systems in several places. 5.6.7 Where aisle containment systems are installed, the existing suppression and detection systems shall be evaluated, modified, and tested as necessary to maintain compliance with the applicable codes and standards.
    [Show full text]
  • Anomalous Effects of Water in Firefighting: Increased Fire Intensities by Azeotropic Distillation Effects
    ANOMALOUS EFFECTS OF WATER IN FIREFIGHTING: INCREASED FIRE INTENSITIES BY AZEOTROPIC DISTILLATION EFFECTS William W. Bannister, Chien-Chung Chen, and Nukul Euaphantasate University of Massachuset~s/Lowell INTRODUCTION The greatest single effect of water in fire extinguishing applications is its great cooling capacity, particu- larly when used in fog or mist form. There are several well-known situations, however, in which appli- cation of water actually serves to intensify a fire: 1. When applied to very hot oil or grease tires, water will flash into steam, with possible spattering effects that can spread the area of a fire. 2. Direction of a vigorous jet of water from a fire hose into burning liquid fuel can also increase the area of a fire by mechanical “digging” effects. 3. Air entrained in water jets, sprays, or mists can feed oxygen to a fire. 4. Water reacts explosively with active metals such as sodium, or with other water sensitive energetic materials such as strong acids or bases. 5. Previous work by this group [l] and confirmed by others [2] has shown that high humidity facilitates autoignition by lowering hot surface ignition temperatures. 6. “Boilover” can result from formation of a heat wave progressing downward through burning fuel floating on water, finally reaching the water and causing it to come to a rapid boil with forcible ejection of burning fnel upward from the surface. This occurs only for burning fuel mixtures made up of both high and low density components (as the lighter components volatilize, the heavier species tend to sink). Thus, this effect is not observed for pure liquids; the fuel mixture must be floating on water, and the effect requires several hours of build-up time before it is observed [3,4].
    [Show full text]
  • Fuelbreak Guidelines for Forested Subdivisions & Communities
    Fuelbreak Guidelines for Forested Subdivisions & Communities By Frank C. Dennis Knowledge to Go Places This publication was developed for use by foresters, Fuelbreak vs Firebreak planners, developers, homeowners’ associations and Although the term fuelbreak is widely used in others. Implementation of these measures cannot Colorado, it is o�en confused with firebreak. The guarantee safety from all wildfires, but will greatly two are entirely separate, and aesthetically different, increase the probability of containing them at more forms of forest fuel modification and treatment. manageable levels. • A firebreak is strip of land, 20 to 30 feet wide (or more), in which all vegetation is removed down to bare, mineral soil each year prior to fire season. Above, cross section of mixed conifer stand before fuelbreak modification. Below, a�er modification. Inadequate fire planning can result in loss of life or property and costly suppression activities. Colorado’s forested lands are experiencing severe impacts from continuing population increases and peoples’ desire to escape urban pressures. Subdivisions and developments are • A fuelbreak (or shaded fuelbreak) is an easily opening new areas for accessible strip of land of varying width (depending homesite construction on fuel and terrain), in which fuel density is reduced, at an alarming rate, thus improving fire control opportunities. The especially along the stand is thinned, and remaining trees are pruned Front Range and around to remove ladder fuels. Brush, heavy ground fuels, recreational areas such snags, and dead trees are disposed of and an open, as Dillon, Vail, and park-like appearance is established. Steamboat Springs. The following is a discussion of the uses, limitations, But with development inevitably comes a higher risk and specifications of fuelbreaks in wildfire control of wildfire as well as an ever-increasing potential for and fuels management.
    [Show full text]