4th_of_July2
image image image image image image

Abstract

Experiments were conducted to assess the performance of various residential smoke alarms to kitchen fires and nuisance alarm cooking scenarios.  A structure representing a kitchen, living room and hallway was constructed to conduct the experiments. Eight different residential smoke alarms types, two photoelectric models (P1 and P2), two ionization models (I1 and I2), two dual sensor photoelectric/ionization models(D1 and D2), and two multi-sensor, intelligent models (M1 and M2) were used in this study.  The data gathered provided insight into the susceptibility of alarm activation from exposures to typical cooking events and alarm times for actual kitchen fires.  The effects of alarm technology and installation location on the propensity of an alarm to activate were examined.  In the kitchen fire experiments, all smoke alarms responded before hazardous conditions developed.  An ionization alarm (I1) tended to respond first compared to other co-located alarms.  Results show smoke alarms placed greater than 6 m from the kitchen range may provide less than 120 s of available safe egress time, which suggests the importance of a more central alarm location closer to the kitchen for this configuration.  Experiments were conducted to determine an alarm’s propensity to activate when exposed to particulates generated from eight typical cooking activities including toasting, frying, baking and broiling.  In most cases, the propensity to nuisance alarm decreased as the distance from the cooking source increased.  Two alarms, I1 and D2, experienced more nuisance alarm activations across the eight cooking activities than the other alarms.  The remaining alarms experienced about the same combined nuisance alarm frequency by averaging all cooking events for installation locations outside the kitchen.  Experiments showed combustible materials typically found on a counter top can spread flames to overhead cabinets, and a single empty 0.6 m wide 1.0 m tall wood-framed, pressboard cabinet can produce a peak heat release rate nearly sufficient to flashover a small room.  Alternatively, protective metal barrier on the bottom and side facing the range tended to limit the spread of flames to the cabinet and reduce the heat release rate.

Access the full paper  here .

DETROIT (WXYZ)

Kim Warner got the scare of her life behind the wheel of her Jeep Wrangler.  "I saw a flash under the hood," she remembers.  She says she was driving at a low speed when her brakes went out and the shifter jammed.  "I had both feet on the brake and my tires were spinning.  I noticed flames coming out the passenger side," she says.

Her boyfriend who was nearby ran, jumped in, and pulled her out of the SUV before it got worse.  "As I pulled her out that is when the flames came thru the dash," he said.

Chrysler sent an inspector, but the automaker said in a statement:  "The cause of the fire was deemed inconclusive by the investigator."

Read more...

 

Loose engine cover could cause fire

Fiat Chrysler is recalling 350,000 Dodge Journey crossovers due to a problem with the vehicle’s engine cover that could lead to a fire.

The covers can become dislodged and come in contact with exhaust components preventing them from moving. If that happens, it could cause a fire. The company has reports of three fires in Chile, involving one injury and no deaths.

Read more...

This recall involves battery-operated night lights with an AC adapter included.  The night light collection includes a pink hedgehog, a blue bird, a yellow rocket, an orange dino egg, a white soccer ball and a green shark.  The model numbers are printed on the bottom side of the night lights.

 

Name Model Number
Color
Size
Hedgehog 060-02-1397 Pink 3.5”(h)x 5.5”(w) Bird 060-02-1398 Blue 4.0”(h)x6.5”(w) Rocket 060-02-1399 Yellow 6.0”(h)x4.75”(w) Dino Egg
060-02-1400 Orange 6.0”(h)x4.75”(w) Soccer Ball
060-02-1401 White 5.0”(h)x5.25”(w) Shark 060-02-1402 Green 3.5”(h)x6.9”(w)

Description:

This recall involves Polaris Youth RZR® 170 EFI recreational off-highway vehicles with model number R15YAV17AA/AF and VINs between RF3YAV170FT000076 and RF3YAV17XFT005141. To see the complete list, visit the firm’s website. The VIN is on the left-hand front frame tube. They were sold in both blue and red. The blue models have a “170 EFI” decal on the right and left side of the hood and an “RZR” decal on the right and left front fenders. The red models have a “170 EFI” decal on the right and left front fenders and a “RZR” decal on the right and left rear fenders.

See the full details at the Polaris website.

Description

This recall involves GreenWorks 12 amp electric blower/vacs. The blower/vacs have a green motor housing and a black blower tube and restrictor nozzle. They measure 12 inches high and 34 inches long. Recalled blower/vacs have model number 24022 with a serial number between GWS0350001 through GWS2280500 or model number 24072 with a serial number between GWR1310001 through GWS2281100. The model number, serial number,  “greenworks” and “ELECTRIC BLOWER/MULCHER WITH BAG” are printed on the side of the motor housing.  Model 24022 has a two-speed switch. Model 24072 has a variable speed switch.

 

Read the full details at CPSC

The next CCAI Training Seminar will be held November 2 - 4, 2015

Appliance Manufacturer LG Agrees to Pay Maximum $1.825 Million Civil Penalty for Failure to Report Defective Dehumidifier

WASHINGTON, D.C.—The U.S. Consumer Product Safety Commission (CPSC) announced today that LG Electronics Tianjin Appliance Co., Ltd., and LG Electronics USA Inc. (LG), agreed to pay a maximum $1,825,000 civil penalty. The civil penalty agreement settles CPSC staff’s charges that LG knowingly failed to report to CPSC, as required by federal law, a defect and an unreasonable risk of serious injury with several models of dehumidifiers.  Fires caused by the defective dehumidifiers resulted in millions of dollars of property damage.

Read the full article at CPSC

Smoke Alarm Performance in Kitchen Fires and Nuisance Alarm Scenarios

Abstract

Experiments were conducted to assess the performance of various residential smoke alarms to kitchen fires and nuisance alarm cooking scenarios.  A structure representing a kitchen, living room and hallway was constructed to conduct the experiments. Eight different residential smoke alarms types, two photoelectric models (P1 and P2), two ionization models (I1 and I2), two dual sensor photoelectric/ionization models(D1 and D2), and two multi-sensor, intelligent models (M1 and M2) were used in this study.  The data gathered provided insight into the susceptibility of alarm activation from exposures to typical cooking events and alarm times for actual kitchen fires.  The effects of alarm technology and installation location on the propensity of an alarm to activate were examined.  In the kitchen fire experiments, all smoke alarms responded before hazardous conditions developed.  An ionization alarm (I1) tended to respond first compared to other co-located alarms.  Results show smoke alarms placed greater than 6 m from the kitchen range may provide less than 120 s of available safe egress time, which suggests the importance of a more central alarm location closer to the kitchen for this configuration.  Experiments were conducted to determine an alarm’s propensity to activate when exposed to particulates generated from eight typical cooking activities including toasting, frying, baking and broiling.  In most cases, the propensity to nuisance alarm decreased as the distance from the cooking source increased.  Two alarms, I1 and D2, experienced more nuisance alarm activations across the eight cooking activities than the other alarms.  The remaining alarms experienced about the same combined nuisance alarm frequency by averaging all cooking events for installation locations outside the kitchen.  Experiments showed combustible materials typically found on a counter top can spread flames to overhead cabinets, and a single empty 0.6 m wide 1.0 m tall wood-framed, pressboard cabinet can produce a peak heat release rate nearly sufficient to flashover a small room.  Alternatively, protective metal barrier on the bottom and side facing the range tended to limit the spread of flames to the cabinet and reduce the heat release rate.

Access the full paper pdf here .

Role of Buoyant Flame Dynamics in Wildfire Spread

Significance

Wildfires burn millions of hectares per year on every inhabited continent, but the physical mechanism governing spread is not known. Models of wildfire spread are widely used for prediction, firefighter training, and ecological research but have assumed various formulations of known heat transfer processes (radiation and convection) absent a definitive theory of their organization. New experimental evidence reported here reveals how buoyancy generated by the fire induces vorticity and instabilities in the flame zone that control the convective heating needed to ignite fuel particles and produce spread.

Abstract

Large wildfires of increasing frequency and severity threaten local populations and natural resources and contribute carbon emissions into the earth-climate system. Although wildfires have been researched and modeled for decades, no verifiable physical theory of spread is available to form the basis for the precise predictions needed to manage fires more effectively and reduce their environmental, economic, ecological, and climate impacts. Here, we report new experiments conducted at multiple scales that appear to reveal how wildfire spread derives from the tight coupling between flame dynamics induced by buoyancy and fine-particle response to convection. Convective cooling of the fine-sized fuel particles in wildland vegetation is observed to efficiently offset heating by thermal radiation until convective heating by contact with flames and hot gasses occurs. The structure and intermittency of flames that ignite fuel particles were found to correlate with instabilities induced by the strong buoyancy of the flame zone itself. Discovery that ignition in wildfires is critically dependent on nonsteady flame convection governed by buoyant and inertial interaction advances both theory and the physical basis for practical modeling.

Full artilce available pdf here 

GM Threatened With Regulatory Investigation Before Issuing Recall For Fire-Prone Hummers

July 14, 2015

Last week, General Motors announced that it would recall nearly 196,000 Hummer vehicles because simply turning on the heating or cooling system could set the car ablaze.While we reported that federal regulators had received nearly two dozen consumer complaints about the issue over the past seven years, a new report finds that the real number of reported incidents is much higher, and that GM may have continued to put off issuing the recall had it not been for threats of an investigation.

Jalopnik, citing sources with the National Highway Traffic Safety Administration, reported earlier today that General Motors only recalled the model year 2006 to 2010 Hummer H3 and model year 2009 to 2010 H3T after regulators threatened to open a formal investigation into the issue.

According to GM, the issue with the Hummer vehicles is related to an electrical part in the heating and cooling system that can overheat and cause a fire inside the dashboard.

Jalopnik reports that the first fire related to the blower issue occurred in August 2008 and was reported to NHTSA the following month.

However, a chronology report [PDF] posted by NHTSA at the time of the recall alleges the company only learned about the issue after receiving two consumer complaints through its Speak Up For Safety program in September 2014.

Read more...

Hearth & Home Technologies Recalls Gas Fireplaces

Corner FireplaceDescription

This recall involves Heat-N-Glo® and Heatilator® Corner Unit Series indoor gas fireplaces. The fireplaces are LP or NG-fueled corner units with tempered glass fronts. The following model numbers are printed on the unit rating plate, located near the controls used to operate the units, and in the instruction manual.

 

LCOR-36TRB-IPI
RCOR-36TRB-IPI
GDCL4136I
GDCR4136I

 See the full details at CPSC

More Articles...

Page 2 of 15

2

Advertise Your Business Here!

CCAI Advertisers enjoy unprecedented exposure to professionals in the public and private sector with tens of thousands of targeted visitors each year looking to arson.org for critical information on the state of fire and arson investigation in the United States and worldwide!  Banner ads should be formatted to 699x125 pixels, JPEG or animated GIF or Flash SWF, 100Kb or less.  Annual advertising rates available.

Banner

Disclaimer

This is the official website of the California Conference of Arson Investigators.

The information published on this website is intended solely for educational purposes and is to be used as an advisory aid to members working to suppress the crime of arson and related offenses. It is also provided to assist in raising the level of expertise in fire investigation.

Articles herein express the views and opinions of the authors which are not necessarily those of the California Conference of Arson Investigators or its representatives. The Technical Publication Review Committee reserves the right to accept or reject any article, technical information or professional opinion submitted for publication on this site.

The acceptance of articles, technical information or opinions on this website does not constitute, and shall not be interpreted as an endorsement of the author(s), opinion(s), information or any product(s) included within this information. It is our intent to present articles and information from our peers to encourage profession discussion and debate among the CCAI members for the purpose of advancing knowledge in the field of fire science and investigation. Professional care should be used to confirm the accuracy of all content, opinions or supplied data prior to use for reference, consulting, and legal support.

All material submitted to CCAI and or posted or published by CCAI that is written, photographed, sketched, drawn, recorded or otherwise created by author(s) is copyrighted. As such, those materials are, and shall remain, the exclusive and sole property of the original author(s). All copyrights are reserved.

Utilizing information provided by CCAI implies that the User/Reader hereby agrees that to the fullest extent allowed by law, CCAI shall have no liability to User/Reader for any and all claims, actions, damages, or losses arising out of, or in any way related to User/Reader’s use of information provided by CCAI. User/Reader further agrees that in no event shall CCAI be liable for any claims or damages of any nature (including costs relating thereto) from such publication. Use of such information provided by CCAI constitutes User/Reader’s agreement with all these terms and conditions stated above.

Join CCAI Today!

Member Benefits:  

  • Training in Fire/Arson Investigation
  • Semi-Annual Training Seminars
  • Regional Roundtable Meetings held throughout the State
  • Fire Investigative Resources
  • Networking between public and private agencies:
    • Fire, Police, Insurance, Private Investigators, Attorneys
  • Legal Updates
  • Certification Development
  • Annual Membership Card
  • CCAI CFI Program
  • Field Training Exercises
  • Videos on fire and arson investigations
  • Members only area: arson.org
  • Attend Seminars at a greatly reduced rate!
2015_fire_prevention_logo
California Certified Fire Investigator

Location

1279 North White Avenue 
Pomona, California 91768 
Phone:  (909) 865-5004
Fax (909) 865-5024 
8:00 am - 5:00 pm 
Monday - Friday

 

 

coin-anim

Login