In This Issue
Vol. 10 No. 4 (Fall 2002)
 Page 1 News
Before the advent of higher-efficiency furnaces, nearly all furnaces had standing pilots that burned 24 hours a day, often for 365 days per year. With the United States energy crisis of the 1970s came the technology for increasing the efficiency of furnaces. Gone were standing pilots. In were intermittent pilot burners, spark igniters, glow coils and hot surface igniters. Even "proving-the flame" methods varied among manufacturers.
In this introductory article, learn how the various furnace ignition systems work and how manufacturers go about verifying the presence of a flame.
 Gas shutoff valve leaks
When pressurizing a gas distribution system after a fire to check for leaks, you’ll often find gas leaking from a shutoff valve or through a closed valve. Find out how the shutoff works — and why it might leak after a fire.
View close-up photos of a few parts of the shutoff valve
Special Report: Ignitable liquid classification update
The Barker & Herbert chemist team updates you on important changes ASTM International approved to two standards focusing on the analysis of fire debris. Find our how the changes help demystify and improve the ignitable liquid class numbering system.
And, in every issue:
Fast Facts • Something for Nothing • Reviews • In-Court Tips • Product Recalls and Manufacturer Problems • Techniques • Site Surfing
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