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ABTH 100.9C

Why is the Air Flow Method the preferred method for conducting a brake pipe leakage test? (Select Best Answer)

The Air Flow method is a more efficient way to satisfy the required leakage test.
The Air Flow Method is more accurate than the Brake Pipe Leakage Test (ABTH 100.9 C).
Performing the Brake Pipe Leakage Test in accordance with rule ABTH 100.9 C is obsolete.

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ABTH 100.9C

Answer: The Air Flow method is a more efficient way to satisfy the required leakage test.

Feedback:
The Air Flow Method is more efficient than using rule ABTH 100.9 C, Brake Pipe Leakage Method. When using the AFM, results of the amount of leakage, if any, in the train is known within a short time of the air being sent through the brake pipe. That time can increase in cold weather. The steps required when using ABTH 100.9 C, at a minimum, require three minutes to complete. The other steps outlined in that rule also require additional time. There is no minimum time to determine leakage when using the AFM. Once the air flow drops below 60 CFM (90 CFM for distributed power trains), the test is complete.