【法规名称】
【法规编号】 79366 什么是编号？
【正 文】
第5页 CAP 311S AIR POLLUTION CONTROL (PETROL FILLING STATIONS) (VAPOUR RECOVERY) REGULATION
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[接上页] 4. Test equipment 4.1 Pressure gauge or manometer Pressure gauge or manometer capable of measuring 0 to 7.84 kPa (0 to 800 mm water column, gauge), or the highest pressure setting of the pressure/vacuum valves installed in the system, whichever is higher, with scale reading of 0.01 kPa (1 mm water column, gauge). 4.2 Test fitting Test fitting for connecting the pressure gauge or manometer to the vapour recovery system shall be installed at a position on the vapour side of the vapour recovery system between the petrol storage tank and the pressure/vacuum valve fitted to the vent pipe of the petrol storage tank. The position of the test fitting shall be so selected to represent the highest pressure variation in the system. 4.3 Stopwatch Stopwatch with accuracy to within 0.2 second for timing the measurement intervals. 4.4 Combustible gas detector A portable hydrocarbon gas analyser with associated sampling line and probe using catalytic oxidation to detect and measure concentrations of combustible gas in air. 4.4.1 Safety Personnel shall assume that the combustible gas detector will be operated in an explosive atmosphere and comply with all pertinent regulations.4.4.2 Range Minimum range of 0 to 100% of the lower explosive limit expressed as propane (0 to 21000 ppm).4.4.3 Probe diameter Sampling probe with internal diameter of 0.625 cm.4.4.4 Probe length Probe sampling line of sufficient length for easy manoeuvrability during testing.4.4.5 Response time Response time to 90% of the final stable reading of less than 8 seconds for detector with sampling line and probe attached. The detector response time shall be equal to or less than 30 seconds. 5. Pretest procedures 5.1 Acquire the factory certified pressure settings of the pressure/vacuum valves fitted to the vent pipes connected to the vapour recovery system and check to ensure that they are working properly. 5.2 Initiate safety procedure. Blockade the work area. Eliminate identifiable sources of ignition. 5.3 Install the test fitting to the vapour recovery system and connect the pressure gauge or manometer to the test fitting. 5.4 Connect all the liquid and vapour pipes for unloading of petrol from the regulated vehicle to the petrol storage tank. For manifolded storage tanks, the tank with the shortest pipe length to the corresponding pressure/vacuum valve shall be selected for the testing. 5.5 Perform a visual inspection to ensure that the vapour and liquid connections of the vapour recovery system of the regulated vehicle and the petrol storage tank are completely interconnected. 5.6 The quantity of petrol to be unloaded to the petrol storage tank shall be of a full compartment of the regulated vehicle. 5.7 The ullage of the petrol storage tank before unloading shall be at a level such that the tank can receive all the petrol to be unloaded. 5.8 Calibrate the combustible gas detector with 2.1% by volume (21000 ppm) propane in air for 100% lower explosive limit response. Calibration gas shall be traceable to the Standard Reference Materials of the National Institute of Standards and Technology, U.S.A. 6. Test procedures 6.1 Stop petrol dispensing from the petrol storage tank(s) in the system at least 5 minutes before the test. 6.2 Record the pressure gauge or manometer readings just before the unloading operation. 6.3 Unload the petrol in the regulated vehicle to the petrol storage tank. Start the stopwatch when the unloading begins and stop the stopwatch at the conclusion of the delivery. 6.4 Record the pressure gauge or manometer readings every 30 seconds during the unloading operation. Record any sudden change of pressure readings. 6.5 Continue to record the pressure gauge or manometer readings every 30 seconds for a period of at least 5 minutes after conclusion of the unloading operation. Record any sudden change of pressure readings. 6.6 Monitor possible vapour leak from any point of the petrol unloading and vapour recovery system including the pressure/vacuum valves using the combustible gas detector during the entire testing period, in accordance with the following procedures: (a) Probe distance The detector probe inlet shall be 2.5 cm from the potential leak source. The distance can be maintained during monitoring by putting a 2.5 cm extension on the probe tip.(b) Probe movement Move the probe slowly (approximately 4 cm/s). If there is any meter deflection at a potential leak source, move the probe to locate the point of the highest meter response.(c) Probe position The probe inlet shall be positioned in the path of the vapour flow from a leak so as to maximize the measured concentration.(d) Leak checks Leak checks shall be performed individually with a fresh air purge between each leak check. Each leak check shall have a duration of less than twice the instrument response time (typically, less than 16 seconds). Longer leak checks are invalid. The probe must be purged with fresh air for more than 2 instrument response times (more than 16 seconds) between individual leak checks.(e) Wind Attempt to block the wind from the area being monitored.(f) Recording Record the measured maximum vapour concentration with the location for each leak being monitored.6.7 Petrol dispensing from the petrol storage tank(s) may be resumed after the measurement in section 6.5. 6.8 Disconnect all the testing instrumentation from the vapour recovery system after the testing. 6.9 Compare the pressure readings recorded in sections 6.4 and 6.5 and the measured maximum vapour concentrations recorded in section 6.6 to the requirements in section 2. (L.N. 95 of 1999) |
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