INTERTEK/WARNOCK HERSEY AIR FURANCE EMISSIONS AND EFFICIENCY TESTING LABORATORY OPERATING PROCEDURES pg. 4
c. Place Impingers in container and connect with greased "U TUBES". (Grease carefully on bottom half of ball joint so that grease will not get into tubes.) d. Connect filter to impinger #1 and sample line to impinger #4.
e. Connect stack probe to filter. f. Leak check system as follows: 1) Plug probe. 2)
Turn on sample system and increase flow rate slowly. Set vacuum-adjust valve to obtain a vacuum of 10 inches mercury.
3)
4) If sapphire float in rotometer does not stabilize below 10 on scale, system must be resealed. 5) Repeat leak-check procedure until satisfactory results are obtained. 6) Unplug probe slowly, then decrease flow rate slowly before shutting off system.
g. Just prior to starting test, fill impinger container with ice.
B. Dilution Tunnel Sample Train Set-Up:
1. Filters and holders.
a. Clean probes and filter holder front housings carefully and desiccate to a constant weight prior to use. b. Filters and filter probe combinations should be numbered and labeled prior to use. c. Weigh desiccated filters and probe filter units on analytical balance. Record the weights on the appropriate form. Note that the probe and front half of the front filter holder is to be weighed as a unit. d. Carefully assemble the filter holder units and connect to sampling systems.
2. Leak checking.
a. Each sample system is to be checked for leakage prior to inserting probes in tunnel. b. Plug probes and start the samplers. Adjust pump bypass valve to produce a vacuum reading of 10 inches mercury. NOTE: During test, highest vacuum recorded is required for posttest leak check. c. Allow vacuum indication to stabilize at 10" mercury, record dry gas meter readings, (DGM 1 , DGM 2 ). At a convenient DGM value start stopwatch. Time for 1 minute then stop vacuum pumps. Record dry gas meter readings again, (DGM 3 , DGM 4 ). NOTE: If rotometer ball is floating above the 5-mm mark, system is leaking too much and all seals should be checked.
G:\Hearth\EE - Emissions and Efficiencey\Furnace solid fuel\Lab Procedures for EPA Air Furnaces 11.11.16.doc
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