INTERTEK/WARNOCK HERSEY AIR FURANCE EMISSIONS AND EFFICIENCY TESTING LABORATORY OPERATING PROCEDURES pg. 7
j. Filter temperatures shall not exceed 90ºF anytime during the test. If the filters are approaching 90ºF turn on cooling pump. Filters must be kept above the dilution tunnel wet bulb temperature in order to prevent condensation. k. Regularly check impinger train for ice level during test. l. After 30 seconds of 0.00 lbs. weight, and on the minute, shut off
sample trains and record last reading. m. Record final dry gas meter values.
IV. POST TEST PROCEDURES
A. Leak Checks
1. Dilution Tunnel
a. Remove both sample probes from tunnel and plug with rubber stopper. b. Turn on sample system and set vacuum to 10" mercury or to the highest value reached during the test. c. At a convenient value start stopwatch and record the DGM starting value. d. After 1 minute stop sample system and record ending DGM value. e. Calculate leakage rate per pre-test description (see II.B.2.c.).
2. Gas Analyzers
a. Set stack sample flow to about 75 mm on the rotometer. b. Plug with rubber stopper. c. Adjust vacuum to 10" mercury. d. Let system stabilize then record rotometer readings. e. If the rotometer readings do not equal zero, check with the laboratory manager. f. SLOWLY unplug probe and decrease flow rate to zero. g. Turn off stack sampling system. h. Zero, span and calibrate the analyzers (see Gas Analysis). RECORD ONLY these meter values.
B. Particulate Sample Recovery
1. Disassemble filter holder and scrape gasket with scalpel. Collect all loose material on filters. 2. Weigh and record probes and filters for each train. NOTE: 24 hours of desiccation must pass before final "no change" weight values can be recorded. 3. Weigh and record probes and fillers at 6-hour intervals until weight change between weighing is less than 0.2 mg.
G:\Hearth\EE - Emissions and Efficiencey\Furnace solid fuel\Lab Procedures for EPA Air Furnaces 11.11.16.doc
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