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Chapter 21 - Compressed Air Foam Systems Failure of any component of the CAFS to maintain air and water pressures and discharge volumes at or above the system rating shall constitute failure of the test. Chapter 21 - Compressed Air Foam Systems Standby run test: (short version) one 200’ line with quarter turn valve, establish a foam flow with a output pressure of 125psi. With water tank half full. Close the valve and maintain engine speed for 10 minutes without discharging water, air or foam solution from the CAFS and without operator intervention. continued Chapter 21 - Compressed Air Foam Systems After 10 minutes open the valve(slowly) Either damage to the system that effects rated performance of the lack of a fire stream immediately upon opening the hose line shall constitute failure of the test. 103