independent third-party test results
Project No. 148
Test Report for the ARID Technologies Vapor Recovery Unit
installed in LANTANA, FL, continued
Prepared for: Arid Technologies, Inc.
Prepared By: Matus Technical Services, Inc.
4.0 Test Procedure
The vapor recovery unit hydrocarbon emission rate will be determined from processor outlet hydrocarbon concentration and outlet volume. The test methods MTS will use are specified in 40CFR60 Section 60.503 of Subpart XX. The methods include EPA Standard Reference Methods 2A, 21 and 25B.
4.1 Test Equipment and Installation
In this system the retentate, or exhaust of the PERMEATOR® was hard piped to a roots meter.
The inlet analysis equipment consists of a Horiba Model PIR-2000 non-dispersive infrared analyzer (NDIR). The analyzer was operated in the range of 0-60% as propane and was calibrated on-site with propane in nitrogen standards.
Inlet samples were drawn from the vapor line upstream of the point where the vapor line enters the recovery unit. A stainless steel sample pump with Teflon diaphragm was used to draw the
sample from the inlet through a Teflon sample line to the inlet hydrocarbon analyzer.
The permeate or return analysis equipment consisted of a Summit non-dispersive infrared analyzer (NDIR). The analyzer was also operated in the range of 0-60% as propane and was calibrated on-site with propane in nitrogen standards.
Permeate samples were drawn from the vapor line upstream of the point where the vapor line returns to the storage tanks. A stainless steel sample pump with Teflon diaphragm was used to draw the sample from the permeate line through a Teflon sample line to the inlet hydrocarbon analyzer.
Outlet volume was measured with a Romet model RM1000DCID rotary gas meter. A Pulse-A-Matic transmitter, attached to the rotary gas meter, sent a single pulse for every half a cubic foot through the meter. Using test ports in the hard piping, temperature was measured with a K type thermocouple and meter pressure was measured with a Rosemount pressure transmitter.
Outlet samples were drawn from a site on or near the rotary gas meter. The outlet analyzer was a Horiba Model PIR-2000 NDIR analyzer operating in the range 0 - 4% C3. A stainless steel sample pump with Teflon diaphragm was used to draw the sample from the outlet through a Teflon sample line to the outlet analyzer. The analysis system was housed in a laboratory trailer parked adjacent to the recovery unit.
A Campbell Scientific data acquisition system (DAS) was used to collect and log the data obtained from the above mentioned instrumentation. The DAS monitors readings once each second and reports the results in one minute averages.
4.2 Test Equipment Calibration
Analyzer calibration gases will conform to approximately 25, 50 and 90% of full range. Zero reference gas was hydrocarbon free air. All calibration gases conformed to applicable Reference Method requirements, and were traceable to NIST Standard Reference Materials.
After field use, the dry gas meter and rotary meter were checked at an intermediate flow rate of approximately 60% of rated flow. If the calibration values have changed less than 1.5%, the field data are acceptable. If a change from the previous calibration values is more than 1.5%, the meter will be recalibrated over its full range of flow.
Temperature and pressure transmitters used for field measurements were calibrated after testing. Calibration data forms for the rotary meter, thermocouple, and pressure transmitters are shown in Appendix C.
4.3 Analysis Procedure
Prior to initiating the emissions test, all vapor fittings on the processor were leak tested. The test lasted 72 hours. Two approximate 24 hour periods were without the PERMEATOR® operating. One of these 24 hours was with the pressure vacuum (PV) valve removed from the vent pipe and the second 24 hour period was with the PV valve attached to the vent pipe. During these two time frames only the outlet analyzer and flow were monitored. The third 24 hour period was while the PERMEATOR® is in operation and the inlet and outlet hydrocarbon concentrations were continuously recorded. The analyzers were zero and span checked about once every six hours. The average volume meter temperatures and pressures, during each one minute interval, were logged by the DAS and used to convert actual meter volume to standard conditions.
During the test period gasoline dispensing data will be gathered from the computers logging the gasoline loading data.
4.4 Data Analysis
The hydrocarbon analyzer readings were averaged by the DAS over each one minute interval. The vapor volumes were obtained by totaling the number of pulses over each one minute period. The volumes were then converted to standard conditions using the recorded temperature and pressures.
Inlet and return volumes were calculated from outlet composition using the formulas described in Method 2B which are included in the next section. The outlet mass was then calculated as the product of outlet volume, pollutant concentration and the standard density of the pollutant. The pounds per 1000 gallons dispensed rating was calculated by dividing the total hydrocarbon mass emitted by the amount of gasoline dispensed.
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