【法规名称】
【法规编号】 79366 什么是编号？
【正 文】
第4页 CAP 311S AIR POLLUTION CONTROL (PETROL FILLING STATIONS) (VAPOUR RECOVERY) REGULATION
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[接上页] 3. Principle and summary of test procedures 3.1 The integrity of the vapour recovery system must be proven to ensure its proper operation. A system which will not hold pressure may permit the release of liquids or vapours. The pressure decay test is a low pressure testing method which is performed with all components connected to the piping. 3.2 Fuel dispensing must be suspended during the test since any fuel dispensed will cause a loss of pressure which may be erroneously interpreted as a leak. Vents and vapour processing equipment are plugged and each vapour-return piping run is pressurized with nitrogen to a pressure equal to 2.49 kPa (254 mm water column, gauge). The nitrogen source is then disconnected and the system is allowed to stand under pressure for a period of 5 minutes. The gauge is read to determine the extent of any pressure loss or decay. The results of the test are influenced by the volume of nitrogen in the system and the ullage in the tank. 4. Test equipment 4.1 Nitrogen cylinder and regulator High pressure commercial grade nitrogen gas cylinder equipped with a two-stage pressure regulator and grounding device. 4.2 Pressure relief valve Pressure relief valve set and checked to activate at 6.9 kPa (704 mm water column, gauge). 4.3 Pressure gauge or manometer 0 to 2.49 kPa (0 to 254 mm water column, gauge) pressure gauge or water manometer readable to 0.01 kPa (1 mm water column, gauge). 4.4 Vent plug Threaded or friction-fit plug. 4.5 Test fitting Test fitting for introducing nitrogen into the system and connecting a gauge. 4.6 Stopwatch Stopwatch with accuracy to within 0.2 second. 5. Pretest procedures 5.1 Initial safety procedures. Blockade the work area. Eliminate identifiable sources of ignition, including electrical power to electrical devices associated with vacuum-assist systems, if installed. 5.2 Determine the tank ullage by deducting the fuel in each tank from the tank's capacity. There must be a minimum ullage of 30% of the tank capacity, but not less than 1895 litres for an acceptable test. Vent pipes may be manifolded during the test to achieve the required minimum ullage. 5.3 Check all the pressure/vacuum valves serving the petrol storage tanks to ensure that they are working properly. 5.4 Remove all dry-break caps. 5.5 Install the test fitting at an accessible point in the vapour-return system downstream of any vapour check valve. 5.6 Install the pressure relief valve. 5.7 Secure the nitrogen cylinder and attach the grounding device to the tank or piping. Connect the nitrogen supply to the test fitting. 5.8 Plug the vents. 6. Test procedures 6.1 Open the nitrogen cylinder and regulate the delivery pressure to not more than 135 kPa. Pressurize the vapour recovery system. Maintain the flow of nitrogen until the pressure and flow stabilize, indicating that the temperature and vapour pressure in the tank have stabilized. 6.2 When the pressure reaches 2.49 kPa (254 mm water column, gauge), close the nitrogen cylinder valve and start the stopwatch. 6.3 At the end of each minute, record the gauge pressure. 6.4 At the end of 5 minutes, record the final test pressure. 6.5 Compare the final test pressure to the requirements in section 2.2. To determine the minimum acceptable remaining pressure (P) for the intermediate values of the ullage space, interpolate between values in the table. For example, to calculate the minimum acceptable remaining pressure (P) for 4500 litres ullage, use the values for 3790 litres and 5685 litres ullage, as follows- (4500 - 3790)P = 1.62 + ---------------- x (1.89 - 1.62) (5685 - 3790) = 1.72 kPa Therefore, the minimum acceptable remaining pressure for 4500 litres ullage is 1.72 kPa (175 mm water column, gauge). 7. Concluding the test 7.1 Carefully unplug the vents and allow any remaining pressure to escape. 7.2 Remove the test fitting. 7.3 Disconnect the nitrogen cylinder grounding device. Cap 311S Sched 3 EFFECTIVENESS TEST FOR THE VAPOUR RECOVERY SYSTEM OF A PETROL FILLING STATION DURING UNLOADING OF PETROL [sections 3 & 4] 1. General This test procedure is used to determine the effectiveness of vapour recovery system in a petrol filling station by monitoring any petrol vapour released from the vent pipes during unloading of petrol from a regulated vehicle to a petrol storage tank. 2. Determination of compliance The following requirements shall be complied with- (a) any pressure readings recorded in sections 6.4 and 6.5 shall be lower than the pressure setting of the pressure/vacuum valves; (b) any measured maximum vapour concentration in section 6.6 shall not exceed 100% of the lower explosive limit. 3. Principle and summary of test procedures During petrol unloading from a regulated vehicle to a petrol storage tank, the pressure at the vapour side of the petrol storage tank is measured. To assess the effectiveness of vapour recovery, the measured values are compared with the setting of the pressure/vacuum valves installed in the system. Vapour leakage is monitored to ensure no leakage from the system. |
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