Environmental Control of Gas Appliances. Part 2. Development of a Method for Detecting Unacceptable Flue Gas Leakage from Heat Exchangers

摘要

A procedure was developed for detecting unacceptable leakage of flue gases through heat exchangers of warm air furnaces. This procedure was particularly suited for field use and is more reliable than many of the existing test methods that have been used, e.g. smoke bombs, salt sprays, etc. The final form of the method consists of flooding the flue gas side of the exchanger with a 14.3% CH4 in N2 mixture and probing the air side of the heat exchanger with a suitably calibrated combustible gas detector.