1 U.S. Fire Administration/Technical Report Series Class A Foam for Structural Firefighting USFA-TR-083/December 1996 Homeland Security
3 U.S. Fire Administration Fire Investigations Program The U.S. Fire Administration develops reports on selected major fires throughout the country. The fires usually involve multiple deaths or a large loss of property. But the primary criterion for deciding to do a report is whether it will result in significant lessons learned. In some cases these lessons bring to light new knowledge about fire--the effect of building construction or contents, human behavior in fire, etc. In other cases, the lessons are not new but are serious enough to highlight once again, with yet another fire tragedy report. In some cases, special reports are developed to discuss events, drills, or new technologies which are of interest to the fire service. The reports are sent to fire magazines and are distributed at National and Regional fire meetings. The International Association of Fire Chiefs assists the USFA in disseminating the findings throughout the fire service. On a continuing basis the reports are available on request from the USFA; announcements of their availability are published widely in fire journals and newsletters. This body of work provides detailed information on the nature of the fire problem for policymakers who must decide on allocations of resources between fire and other pressing problems, and within the fire service to improve codes and code enforcement, training, public fire education, building technology, and other related areas. The Fire Administration, which has no regulatory authority, sends an experienced fire investigator into a community after a major incident only after having conferred with the local fire authorities to insure that the assistance and presence of the USFA would be supportive and would in no way interfere with any review of the incident they are themselves conducting. The intent is not to arrive during the event or even immediately after, but rather after the dust settles, so that a complete and objective review of all the important aspects of the incident can be made. Local authorities review the USFA s report while it is in draft. The USFA investigator or team is available to local authorities should they wish to request technical assistance for their own investigation. For additional copies of this report write to the U.S. Fire Administration, South Seton Avenue, Emmitsburg, Maryland The report is available on the Administration s Web site at
5 Class A Foam for Structural Firefighting Investigated by: Jeff Stern J. Gordon Routley This is Report 083 of the Major Fires Investigation Project conducted by Varley-Campbell and Associates, Inc./TriData Corporation under contract EME-94-C-4423 to the United States Fire Administration, Federal Emergency Management Agency. Homeland Security Department of Homeland Security United States Fire Administration National Fire Data Center
7 U.S. Fire Administration Mission Statement As an entity of the Department of Homeland Security, the mission of the USFA is to reduce life and economic losses due to fire and related emergencies, through leadership, advocacy, coordination, and support. We serve the Nation independently, in coordination with other Federal agencies, and in partnership with fire protection and emergency service communities. With a commitment to excellence, we provide public education, training, technology, and data initiatives. Homeland Security
9 ACKNOWLEDGMENTS The United States Fire Administration appreciates the help of the following persons that provided information for this report: Sven Carlson Sam Duncan Deputy Chief Ken Jones Chief Bill May Doug Miller Eric Peterson Captain Gary Pope Kevin Roche Assistant Chief Rick White FoamPro Corporation U.S. Army Tank-Automotive Command, Ft. Belvoir (VA) Fairfax County Fire & Rescue Department (VA) Westlake Fire Department (TX) Task Force Tips/KK Products National Fire Protection Research Foundation (MA) Fairfax County Fire & Rescue Department (VA) Phoenix Fire Department (AZ) Nashville Fire Department (TN) Underwriters Laboratories
11 TABLE OF CONTENTS OVERVIEW Summary of Key Issues I. INTRODUCTION TO CLASS A FOAM SYSTEMS History of Foam Use on Class A Fires Types of Foam Delivery Systems Foam Characteristics How Class A Foam Works Foam Proportioning Devices Nozzles Testing and Approval of Foam Concentrates II. SPECIAL CONSIDERATIONS FOR USE OF CLASS A FOAMS Environmental Considerations Personal Safety Considerations Other Special Tactical Uses III. FIRE DEPARTMENT EVALUATIONS AND EXPERIENCE Nashville Fire Department (Tennessee) Phoenix Fire Department (Arizona) Fairfax County Fire and Rescue Department (Virginia) Westlake Fire Department (Texas) IV. SUMMARY OF ADVANTAGES AND DISADVANTAGES Advantages Disadvantages V. RECOMMENDATIONS AND CONCLUSIONS APPENDIX A: UL Report of Class A Foam Tests APPENDIX B: Evaluation of NDI Compressed Air Foam System Applied As A Retrofit APPENDIX C: NFPRF National Class A Foam Research Project Technical Report APPENDIX D: GLOSSARY Bibliography
13 Class A Foam For Structural Firefighting December 1996 Reported by: Jeff Stern J. Gordon Routley OVERVIEW The increasing use of class A foam systems by urban and suburban fire departments for structural fire suppression has created a demand for information on this technology. While class A foams have been used extensively by wildland and rural fire departments, their application to structural fire suppression is a recent trend. This report discusses the use of class A foaming agents in conjunction with water for fire suppression (conventional or nozzle-aspirated class A foam systems); it also provides additional information on the use of class A foam agents with water and compressed air (compressed air foam systems, or CAFS) Many fire departments have conducted their own field testing of class A foam to evaluate its effectiveness in structure fires. Several departments have attempted to adapt class A foam equipment that was originally developed for wildland firefighting for structural firefighting operations. Many benefits of class A foam have been reported, including quicker fire extinguishment, faster overhaul time, less damage to buildings, and reduced fatigue on firefighting personnel due to quicker mop-up after the fire is out. Additional advantages reported with CAFS include the ability to maneuver attack lines easily and the ability to extend available water supply for a longer period of time. Exposure protection is greatly enhanced with class A foam. This report begins with a general overview of nozzle-aspirated class A and compressed air foam systems. It then discusses hands-on evaluations by several fire departments that are currently using class A foam systems in structural fire suppression or wildland/urban interface fire protection. These departments were contacted to provide a candid overview of their experience with class A foams and/or CAFS. In all cases, these departments view class A foam and CAFS as additional tools which increase the efficiency and effectiveness of their fire suppression operations. Reported advantages and disadvantages in the use of class A foams and CAFS in structural firefighting, both from field experience and from recent fire protection literature, are included in this report. Recent studies conducted by Underwriters Laboratories in cooperation with the National Fire Protection Research Foundation and the U.S. Army Fort Belvoir Research, Development, and Engineering Center compared the use of plain water, nozzle-aspirated class A foam, and CAFS for the extinguishment of class A fires. The experiments showed that nozzle-aspirated class A foams 1
14 2 U.S. Fire Administration/Technical Report Series and CAFS generally extinguished the experimental fires more quickly and used less water than plain water extinguishing methods; though in some cases plain water was shown to be equally effective. The use of compressed air foam systems (CAFS) for structural firefighting was previously evaluated by the United States Fire Administration in Technical Report 074 of the Major Fires Investigation Project in That report, Compressed Air Foam For Structural Fire Fighting: A Field Test; Boston, Massachusetts, highlighted the experimental use of a class A compressed air foam system by the Boston Fire Department s Engine Company 37 in The field test indicated some operational advantages provided by CAFS and encountered some shortcomings in retrofitting the existing apparatus. The Boston test showed that more information is needed to be gathered to determine the extinguishing capabilities and conservation of water supply when using CAFS in an urban environment. Issue Strategy and Tactics Equipment reliability Water supply conservation Water damage reduced Extinguishment Overhaul Hoseline management Costs of equipment Costs for training Costs for foam Safety Summary of Key Issues Comments Departments reported no need to change basic fireground strategy or tactics when using nozzle-aspirated class A or CAFS compared to plain water. Few failures of equipment were reported. Proportioner microprocessors may need to be better isolated from water. Water conservation appears to be a significant advantage of CAFS. The reduced flow rate effectively doubles the capability of tank water. Water conservation is less significant with nozzle-aspirated class A foam. Experimental studies indicate that less water is used to extinguish fires when foam is used. The departments contacted for this report did not document reductions in water damage in urban/structural firefighting. Departments report quicker fire control and extinguishment with both nozzle-aspirated class A foams and CAFS, compared to plain water. Departments report reduced damage during overhaul and less time spent on overhaul and mop-up. Firefighters report that CAFS lines are much easier to handle than water lines due to decreased weight and nozzle reaction. Nozzle operators on CAFS lines must be aware of increased initial nozzle reaction from the build-up of compressed air at the nozzle before the line is opened. No difference was noted with nozzle-aspirated class A foam. Departments reported equipment costs up to $5,000 per unit for nozzle-aspirated class A foam systems. CAFS units may cost up to $40,000 per vehicle. Most departments did not quantify the cost of training their personnel to operate class A foam systems. Class A foam costs approximately 1/10 of the cost of class B foams per gallon of foam produced. The cost of the foam concentrate was not a limiting factor for any of the departments contacted. Safety may be enhanced through reduced fatigue during fireground operations, due to quicker extinguishment and reduced overhaul time. Eye protection and rubber gloves are necessary when handling foam concentrate due to its harsh detergent properties.
15 I. INTRODUCTION TO CLASS A FOAM SYSTEMS History of Foam Use On Class A Fires The use of foam to fight class A fires was first evaluated in the 1930 s. Early studies showed that foams applied to class A fuels could suppress fires more efficiently than plain water in most cases; however, the available foam concentrates were expensive and could only be mixed at high concentrations. They were not a cost effective means of extinguishing fires. The experimental use of CAFS to produce foam dates back to the 1940 s. The State of Texas began using foaming additives for brush and wildland firefighting in the 1970 s. Foam was produced by early compressed air foam systems that used an air compressor mounted on board the fire apparatus to aerate a solution of water and foam concentrate. These early CAFS units were mechanically troublesome but very effective at combating grass and brush fires. Several hundred of these units were eventually developed in Texas and remain in widespread use today. In the 1980 s, synthetic foam concentrates were developed for use on class A fires that could be applied at low concentrations of 0.1 to 1.0 percent. These new concentrates made the use of foam a cost effective means of combating fires because smaller amounts of foam concentrate could be used to make effective foam. The use of class A foams for wildland firefighting expanded in the 1980 s and 1990 s. Recent generations of CAFS and nozzle-aspirated class A foam concentrate induction systems have been more reliable than earlier models. Nozzle-aspirated class A foams and CAFS units have been developed that can deploy foam from firefighters backpacks, from brush and fire engines, and from airplanes and helicopters. Gradually, as fires in wildland/urban interface areas have increased in severity and cost, the urban fire service has been exposed to the use of class A foams. Several urban departments have experimented with different types of foam systems for structural firefighting and some have deployed front-line apparatus with class A foam systems as an added tool in their firefighting arsenals. Types of Foam Delivery Systems Class A foams consist of a mixture of water, foam concentrate, and air. The composition of the foam depends on the proportion of the three components. The two most common methods for producing class A foam are nozzle-aspirated foam systems and compressed air foam systems (CAFS). Conventional or Nozzle-Aspirated Class A Foam Delivery Systems (NAFS)--In nozzle aspirated class A foam delivery systems, the water and foam concentrate are mixed together via an educator or by a mechanical proportioning device to create foam solution. In most class A systems, this occurs on the discharge side of the water pump. The foam solution is delivered to the nozzle where it is aerated to form the class A foam. Foam concentrate can be pre-mixed into the apparatus water tank; however, this has several drawbacks, including possible corrosion of the tank, stripping of the fire pump lubricants, and contamination of the foam solution with rust and scale from the tank, which may adversely affect the ability to produce the type of foam desired. 3
16 4 U.S. Fire Administration/Technical Report Series Nozzle-aspirated class A foams are low energy foam systems which only use the hydraulic energy supplied by the water pump to propel the foam stream. Compressed Air Foam Systems (CAFS)--The compressed air foam system consists of a water pump, an air compressor, and foam concentrate proportioning device. In CAFS, the foam solution (water and concentrate) is mixed on the discharge side of the pump, similar to nozzle-aspirated class A foam delivery systems. Compressed air is then introduced into the mixture. This aerates the foam prior to distribution through the hoselines. Since the product flowing through the hoselines is finished foam, it consists of large amounts of air and a reduced amount of water. Therefore, the hoselines weigh much less and are more flexible than plain water hoselines. They are more easily advanced and maneuvered than water or nozzleaspirated class A foam hoselines. The CAFS hose stream is projected a longer distance than a plain water stream under the same pressure, due to the reduced mass and added energy of the compressed air. In wildland operations CAFS are often operated without a nozzle on the end of the delivery hose. A shut-off nozzle with a straight bore tip is normally used for structural firefighting. The compressed air can build up behind a closed nozzle, which can cause a severe nozzle reaction if the air is not bled off properly by the nozzle operator before fully opening the nozzle. CAFS is considered a high energy foam delivery system because the hydraulic energy of the pressurized water is combined with the pneumatic energy of pressurized air, both to aerate and to propel the foam. Some disadvantages exist with the use of CAFS. The addition of the air compressor complicates the pump operator s job by adding several additional steps to produce compressed air foam. Slug flow may occur if not enough concentrate is mixed into the foam solution, leaving the fire suppression crew with an ineffective stream. If the compressor fails, the hoseline will still deliver plain water or foam solution, but a nozzle must be placed on the line to create an effective stream (if the line is being operated without a standard nozzle). CAFS units can deliver plain water (with the foam eductor off and air compressor shut down) or nozzle-aspirated class A foam (without using the air compressor) in addition to the compressed air foam. Class B foams can also be produced with CAF systems. Experiments have shown that class B CAFS streams are highly effective in providing exposure protection from class B fires. Foam Characteristics Class A foams has physical characteristics that vary depending upon the method of production. The characteristics depend upon the concentration of the foam solution, type of concentrate used, hose length, nozzle type, and means of aeration. In most cases, the pump operator can control the type of foam produced. Foam is generally characterized as wet, fluid, or dry. Wet foam--wet foams are characterized by smaller bubbles, less expansion because less air has been introduced, and fast drain times. Wet foams are generally good for initial fire suppression, overhaul, and penetration into deep-seated fires. Fluid foam--fluid foam has been characterized as having the consistency of watery shaving cream. Fluid foam tends to have medium to smaller bubbles and moderate drain times. Fluid foam is good for direct attack, exposure protection, and mop-up operations.
17 USFA-TR-083/December Dry foam--dry foam has a high expansion ratio and the consistency of shaving or whipped cream. The dry foam is very fluffy and consists mainly of air. Dry foams have slow drain times and hold shape for a long period of time. Dry foam is particularly good for exposure protection because of its ability to cling to vertical surfaces for extended periods. How Class A Foam Works Class A foam is 99 percent water. The foam increases the efficiency of water as a fire extinguishing agent. Heat--The primary method of fire extinguishment with class A foam is the absorption of heat energy from the fire to convert water molecules to steam. This is the same process that makes plain water an effective extinguishing agent. The heat-absorbing properties of water are not changed by the addition of foam; however, the foam bubbles provide a greater surface to mass area for the water, which may allow the liquid water to convert to steam more rapidly. Fuel--Class A foams act as an insulating blanket on class A fuels, protecting exposed and recently extinguished surfaces from the heat of a fire to inhibit ignition (or re-ignition). The surfactant action of class A foam reduces the surface tension of water, allowing the water to penetrate and soak into fuels, instead of running off. This property is particularly significant in reducing overhaul requirements and penetrating tightly packed materials. Oxygen--The foam blanket may help to form a vapor barrier between the burning fuels and oxygen. Foam Proportioning Devices Proportioning devices inject the foam concentrate into water to make foam solution. Several types of proportioning devices can be used with class A foam concentrates. The types of proportioners listed here inject foam at the discharge side of the pump, which is the most common method of installation. Eductors--Foam eductors use the venturi effect of flowing water to draw foam concentrate out of a container and into a hose stream. These devices are identical to class B foam eductors, but regulate the concentrate at a much lower percentage. Eductors are limited to one hoseline per eductor, and the percentage of concentrate is usually limited to a specific setting within a limited range. Eductors are the least expensive induction system next to batch mixing the foam solution in the water tank. If the eductor is not pre-piped, firefighters must connect the eductor into the hoseline and into the concentrate container when they arrive on the fire scene. Eductors are simple devices with few or no moving parts, and do not require a power supply. They are limited by specific water flow and water pressure requirements, usually must be within 150 feet of the nozzle to operate effectively, and introduce a significant amount of friction loss into the hoseline. Eductors are widely used for class B foams because of their low cost and maintenance, and because class B fires are relatively rare. Balanced Pressure Bladders--Bladder proportioners contain foam concentrate in a flexible bladder which is contained within a water tank connected to the water pump. Water is by-passed from the discharge line into the tank, which squeezes the bladder and causes the foam concentrate to be discharged into the water stream. The rate of release is controlled by the rate that water is allowed to enter the tank and displace the contents of the bladder.
18 6 U.S. Fire Administration/Technical Report Series Bladder type proportioners do not require external power sources. The foam delivery must be interrupted in order to refill the bladders with foam concentrate. Concentrate Pumps--Mechanical or electric pumps can also proportion foam concentrate into the water stream. Several manufacturers produce packaged proportioning systems that mix water and foam concentrate at a rate set by the pump operator. This is accomplished through mechanical means (such as a venturi) or by electronic controls (flow meter), depending upon the type of unit. Concentrate pumps require an additional power supply and are more complex than other proportioning methods, but they allow the pump operator to select the percentage of concentrate over a wide range (usually between.1 and 1 percent for class A foams) to control the characteristics of the foam produced. These pumps are often more accurate over a wide range of flow rates than other proportioning devices. Some of these systems can work with two or more foam concentrate tanks, allowing the pump operator to choose between a class A foam concentrate and a class B foam concentrate, depending upon the type of fire encountered. This could be useful for departments in an urban setting that already use class B foams and desire to incorporate class A foams as an additional extinguishing agent. Concentrate pumps allow for the tanks to be refilled without having to interrupt the flow of foam, which is an advantage over eductor or bladder proportioning systems. Nozzles Nozzle-aspirated class A foam can be used with standard firefighting nozzles. Special foam nozzles are not required. Combination nozzles will help aerate the foam solution, forming a very wet foam with little expansion. The combination nozzles can also be used with CAFS; the combination nozzle will act to strip away the large bubbles formed in the foam, leaving a wet foam stream. Smooth bore nozzles can be used with nozzle-aspirated class A foam or CAFS. With CAFS, a large orifice smooth bore nozzle will help straighten and project the foam stream. The larger nozzle size is used because the hose is delivering finished foam to the tip, which expands rapidly when it leaves the nozzle. Some wildland firefighting units apply CAFS with no nozzle on the hoselines. Specialized foam nozzles are available for class A foam. These are often used in the wildland or wildland/urban interface setting, or for exposure protection. Most of the departments contacted for this report use traditional smooth bore or combination nozzles to deliver class A foams, either via nozzle-aspirated foam systems or CAFS. The Nashville (TN) Fire Department uses combination nozzles to achieve 3:1 expansion rate on their nozzle-aspirated class A foam systems. The Fairfax County (VA) Fire and Rescue Department uses 3/4-inch smooth bore nozzles when flowing CAFS. Testing and Approval Of Foam Concentrates Testing--Most of the class A foam concentrates are used primarily by wildland firefighting organizations. The U.S. Forest Service and the Department of Agriculture require class A foam concentrates to be approved for use on wildland fires. The concentrates must pass a series of tests for product stability and storage, corrosion, health and safety, and operational evaluations. NFPA 298 (1989), Standard on Foam Chemicals for Wildland Fire Control also addresses class A foam concentrates, but does not set any performance measures for structural firefighting.
19 USFA-TR-083/December U.S. Government Approved Class A Foam Concentrates--The following class A foam concentrates have received interim approval for use on ground fire engines from the U.S. Forest Service at the time of this publication. An updated list of approved foams can be received by contacting the National Interagency Fire Center (NIFC) in Boise, Idaho. Some of these foam concentrates have also been approved for use in aerial applications (helicopter or air tanker). Departments can contact the NIFC for more information. Class A Foam Concentrate Mix Ratio Ansul Silv-Ex % Fire-Trol FireFoam % Phos-Chek WD % Fire-Trol FireFoam % Angus ForExpan S % Procap B % TCI Fire Quench % Storage of Foam Concentrates--Class A foam concentrates should be stored according to the manufacturer s guidelines. Concentrates should generally be stored in their original containers, either 55-gallon drums or 5-gallon cans. Apparatus concentrate tanks should be constructed of polyethylene, polypropylene, fiberglass, or other plastic composite material. The foam concentrate will cause degradation of steel, aluminum, and some stainless steel tanks, which could lead to damage or malfunction of the foam proportioning equipment.
21 II. SPECIAL CONSIDERATIONS FOR USE OF CLASS A FOAMS Environmental Considerations In general, class A foams are much more environmentally friendly than most class B film-forming foams, which will not biodegrade well and often must be cleaned up as toxic waste after use. Care should be taken to prevent spills of concentrate into waterways and watershed areas, because aquatic life is sensitive to foaming agents. The use of foam in wildland firefighting has proved that foam has little effect on forests soils and plant life due to its ability to rapidly degrade. Federally approved class A foams are tested for their ability to biodegrade into inert components within an established period of time. For approval by the U.S. Forest Service, 50 percent of foam must biodegrade within 28 days. Most foams biodegrade within 14 to 30 days. Foams are also tested for their toxicity to certain types of fish and marine life. The National Wildfire Coordinating Group advises that the following guidelines be followed to prevent damage to aquatic environments when using foams. The group advises that these precautions be taken near domestic reservoirs and domestic water supplies as well. Train all personnel in the potential problems of introducing foam concentrates into bodies of water. Locate foam mixing and loading areas where there is minimal contact with natural bodies of water. Avoid spills at mixing and loading areas, especially when located near live streams. Exercise caution when using foams in watersheds where fish hatcheries are located. Leave a 100- to 200- foot buffer zone between the area where foam is used and the high water line. Departments that use class A foams in an urban or suburban setting should be aware of these protective measures to prevent adverse environmental impacts. The impact of foam in public sewage systems has not been documented. Personal Safety Considerations Foam concentrates are harsh detergents which can irritate the skin, causing dryness, cracked skin, and bleeding. Diluted foam solution should have little or no effect on personnel. Proper precautions should be taken when handling foam concentrates to prevent injury. Personnel that handle concentrates should wear goggles and rubber gloves to prevent skin and eye irritation. Long-sleeved shirts and long pants are recommended. Rubber boots are also recommended, as the concentrate can soak through leather boots quickly. It is recommended that spills of concentrate be soaked up with absorbent rather than flushed with water (which will create a lot of foam). Personnel should have access to emergency eye wash equipment should concentrate splash into the eyes. 9
22 10 U.S. Fire Administration/Technical Report Series When using foam, personnel should be aware of slippery surfaces. This should require little adjustment for personnel in a structural environment, where water run-off tends to leave surfaces slippery, anyway. Few departments reported any problems with slippery conditions. Personnel must also avoid drinking water from tanks where foam concentrates have been introduced. Warning signs should be posted to prevent thirsty firefighters from drinking water out of these tanks. Government approved class A foams are tested for human toxicity. Several tests are conducted, including determining the acute oral limit, the acute dermal limit, primary dermal irritation, primary eye irritation, and the acute inhalation limits. Results of these tests should be available from the manufacturer and listed on the material safety data sheets shipped with the foam concentrate. Other Special Tactical Uses While useful in general day-to-day operations, class A foam has the potential to have a great advantage in certain fire situations when compared to plain water. Conflagrations--Departments facing large, uncontrolled fires such as wildland/interface fires, or fires that have occurred after earthquakes, could deploy nozzle-aspirated class A foam or CAFS units as a means of protecting exposures, confining and extinguishing fires. The ability of CAFS units to engage in rapid extinguishment and overhaul could greatly increase the capabilities of companies combating large fires that may result from wildfires, earthquakes, or civil disturbances. The special ability of CAFS to conserve water supplies is an advantage, especially for independent task force units facing conflagration situations where hydrant systems have been destroyed. Unstable structures--fires that occur in unstable or unsafe buildings could be fought from a greater distance by using the long reach of CAFS foam streams. Crews could remain at a safe distance outside of the collapse zone. Theoretically, additional weight from water would be reduced with the use of foam, lessening the chance for a collapse. Lightweight construction--the rapid and enhanced fire suppression capability of nozzle-aspirated foam systems and CAFS could improve fire suppression when fighting fires in modern, lightweight construction or trussed-roof structures.
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