Overview ARFF Operations Foam Testing Requirements. Problems found throughout the industry. Foam Testing.
ARFF Operations Required by Part 139 for carrier operations Must be in full operational condition for the flying public Documentation is paramount. Partnership between ARFF and Maintenance
Foam 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 150/5220-10C pages 29 – 32 illustrates the performance requirements for both foam and dry chemical.
Problems Throughout the Industry Foam Too Rich Foam Too Lean Valve failure Air Line failure Dry Chemical system failure.
Problems Throughout the Industry: Foam Too Rich Wastes foam Reduces fire fighting capability. Costs will increase.
Cost of Rich Foam Cost of Foam Foam Production Replacement Cost Proper metering $20.0066 gallons$1,320.00 Improper metering $20.00200 gallons$4,000.00 Variance----------134 gallons$2,680.00
Problems Throughout the Industry: Too Lean Ineffective foam blanket not meeting Advisory Circular Standards. Safety issue for ARFF personnel and passengers. Underlying vehicle problems.
Good Foam Blanket Provide an acceptable expansion ratio. Provides proper fire protection.
Problems Throughout the Industry: Valve Failure
Problems Throughout the Industry: Valve Failure Results Inoperability of the vehicle. Reduction of ARFF Index Requirements. Replacement Vehicle. Increased maintenance costs.
Foam Testing Began 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.
Foam Testing Annual expansion, drain and distance testing. Combination of the expansion, drain and conductivity readings monthly. The distance testing annual.
History 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 Kohlrausch Picture Courtesy of Thomas B. Greenslade Jr.
History Discovered the Kohlrausch Law in 1879 on the independence of migrating ions” (Zeiss 2002). Kohlrausch Universal Bridge Picture Courtesy of Thomas B. Greenslade Jr.
What 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.
Conductivity Meter vs The Refractometer Different Technologies Conductivity Meter more precise. Refractometer leaves every test up to for different interpretation. Omega CDH-280 Courtesy of Omega Enginering Refractometer
Conductivity Meter vs The Refractometer Cont. Courtesy of Atgo Co.
Tools Needed 1000 ML Graduated Cylinder Distilled Water Conductivity Meter & Probe Syringes Gram Scale 100 ML Graduated Cylinders Calibration Solution
Involving 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.
Deflector Plate Set Up Clear open area to conduct the test. Secure the deflector plate. Ensure the plate is clean and free of debris.
Shooting Foam (Outside) Position ARFF Vehicle at least 50 – 100 feet away. Activate Foam System Direct 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.