2Overview ARFF Operations Foam Testing Requirements. Problems found throughout the industry.Foam Testing.
3ARFF Operations Required by Part 139 for carrier operations Must be in full operational condition for the flying publicDocumentation is paramount.Partnership between ARFF and Maintenance
4Foam Testing Requirements NFPA 412 Standard for Evaluating Foam Fire Fighting Equipment on Aircraft Rescue and Fire Fighting Vehicles.NFPA 412 page 412-5, States Two different methods of testing. Method A is for a refractometer or conductivity meter.Advisory Circular 150/ C pages 29 – 32 illustrates the performance requirements for both foam and dry chemical.
5Problems Throughout the Industry Foam Too RichFoam Too LeanValve failureAir Line failureDry Chemical system failure.
6Problems Throughout the Industry: Foam Too Rich Wastes foamReduces fire fighting capability.Costs will increase.
7Cost of Rich Foam Cost of Foam Foam Production Replacement Cost Proper metering$20.0066 gallons$1,320.00Improper metering200 gallons$4,000.00Variance134 gallons$2,680.00
8Problems Throughout the Industry: Too Lean Ineffective foam blanket not meeting Advisory Circular Standards.Safety issue for ARFF personnel and passengers.Underlying vehicle problems.
9Good Foam Blanket Provide an acceptable expansion ratio. Provides proper fire protection.
16Foam TestingBegan as a project for the AAAE CMF process in the fall of 2000.Assistance from a physics professor at The Ohio State University and The Cincinnati Northern Kentucky Airport Fire Dept.
17Foam Testing Annual expansion, drain and distance testing. Combination of the expansion, drain and conductivity readings monthly. The distance testing annual.
18History of Conductivity Testing The founding father of the measurement of conductivity was a German physicist Friedrich Kohlrausch.The majority of his research focused on how electricity was conducted in solutions.Friedrich KohlrauschPicture Courtesy of Thomas B. Greenslade Jr.
19HistoryDiscovered the Kohlrausch Law in 1879 on the independence of migrating ions” (Zeiss 2002).Kohlrausch Universal BridgePicture Courtesy of Thomas B. Greenslade Jr.
20What is Conductivity ?Definition - Conductivity is the ability of a material to conduct electrical current.Two plates are placed in a sample, the potential is applied across the plates, and the current is measured.
21Conductivity Meter vs The Refractometer Different TechnologiesConductivity Meter more precise.Refractometer leaves every test up to for different interpretation.Omega CDH-280 Courtesy of Omega EngineringRefractometer
22Conductivity Meter vs The Refractometer Cont. Courtesy of Atgo Co.Courtesy of Atgo Co.
23Tools Needed 1000 ML Graduated Cylinder Distilled Water Conductivity Meter & ProbeSyringesGram Scale100 ML Graduated CylindersCalibration Solution
25Involving Shift Personnel Creates: A better understanding of the operation of foam systems and ARFF vehicles.A sense of ownership of the operation.A team building atmosphere.
26Deflector Plate Set Up Clear open area to conduct the test. Secure the deflector plate.Ensure the plate is clean and free of debris.
27Shooting Foam (Outside) Position ARFF Vehicle at least 50 – 100 feet away.Activate Foam SystemDirect stream away from deflector plate for at least 15 to 30 seconds.Then direct stream to the middle of the target and fill the graduated cylinder.