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GB 20952-2020 English PDF

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GB 20952-2020: Emission Standard of Air Pollutants for Gasoline Filling Stations
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GB 20952: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 20952-2020	English	759	Add to Cart	6 days [Need to translate]	Emission Standard of Air Pollutants for Gasoline Filling Stations	Valid	GB 20952-2020
GB 20952-2007	English	360	Add to Cart	0--9 seconds. Auto-delivery	Emission standard of air pollutant for gasoline filling stations	Obsolete	GB 20952-2007

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Basic data

Standard ID	GB 20952-2020 (GB20952-2020)
Description (Translated English)	Emission Standard of Air Pollutants for Gasoline Filling Stations
Sector / Industry	National Standard
Classification of Chinese Standard	Z60
Word Count Estimation	39,319
Date of Issue	2020-12-28
Date of Implementation	2021-04-01
Older Standard (superseded by this standard)	GB 20952-2007
Regulation (derived from)	Ministry of Ecology and Environment Announcement No. 74 (2020)
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration

GB 20952-2020: Emission Standard of Air Pollutants for Gasoline Filling Stations

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Emission Standard of Air Pollutants for Gas Stations) Emission standard of air pollutants for gas stations Emission standard of air pollutant for gasoline filling stations ICS 13.040.40 Z 60 National Standards of People's Republic of China Replace GB 20952-2007 2020-12-28 release 2021-04-01 implementation Ministry of Ecology and Environment State Administration for Market Regulation release

Foreword...II 1 Scope of application...1 2 Normative references...1 3 Terms and definitions...1 4 Oil and gas emission control requirements...4 5 Emission limits...5 6 Air pollutant monitoring...7 7 Implementation and supervision...7 Appendix A (Normative Appendix) Liquid Resistance Detection Method...9 Appendix B (Normative Appendix) Airtightness Testing Method...12 Appendix C (Normative Appendix) Gas-liquid ratio detection method...15 Appendix D (Normative Appendix) Testing Methods of Oil and Gas Treatment Equipment...21 Appendix E (Informative Appendix) Technical Requirements for Online Monitoring System...22 Appendix F (informative appendix) on-line monitoring system accuracy check method...28 Appendix G (Informative Appendix) Gas Station Inspection Report...29 Emission standard of air pollutants for gas stations

1 Scope of application

This standard specifies the requirements for the control and monitoring of oil and gas emissions during the unloading, storage and refueling of gasoline (including alcohol-containing gasoline) at gas stations. Test and supervise management requirements. This standard is applicable to the management of oil and gas emissions from gasoline (including alcohol-containing gasoline) at existing gas stations, as well as new, rebuilt, and expanded gas stations Environmental impact assessment, design, completion acceptance of the project, the issuance of pollution discharge permits and the management of oil and gas emissions after completion. After the implementation of the new emission standard, if the content stipulated in the existing enterprise’s emission permit is inconsistent with the new standard, it shall be stipulated in the new standard. Change the pollution discharge permit before the effective time limit.

2 Normative references

This standard quotes the following documents or their clauses. For dated reference documents, only the dated version applies to this standard quasi. For undated references, the latest version (including all amendments) applies to this standard. GB 16297 Comprehensive Emission Standard of Air Pollutants GB 18352.6 Light-duty vehicle pollutant emission limits and measurement methods (China Phase 6) GB 50156 Code for Design and Construction of Automobile Refueling Station GB/T 16157 Determination of particulate matter in exhaust from stationary sources and sampling method for gaseous pollutants HJ 38 Determination of total hydrocarbons, methane and non-methane total hydrocarbons in stationary pollution sources gas chromatography HJ/T 55 Technical Guidelines for Monitoring Unorganized Emissions of Air Pollutants HJ 212 Pollutant online monitoring (monitoring) system data transmission standard HJ/T 373 Fixed pollution source monitoring quality assurance and quality control technical specifications (trial implementation) HJ/T 397 Fixed source exhaust gas monitoring technical specification HJ 604 Determination of Ambient Air Total Hydrocarbons, Methane and Non-Methane Total Hydrocarbons Direct Sampling-Gas Chromatography HJ 733 Leakage and open liquid level emission of volatile organic compounds detection technology guide HJ 819 General Rules of Technical Guidelines for Self-monitoring of Pollutant Discharge Units HJ 1118 Pollutant Discharge Permit Application and Issuing Technical Specifications for Oil Storage Depots and Gas Stations "Environmental Monitoring Management Measures" (State Environmental Protection Administration Order No. 39) "Measures for the Disclosure of Environmental Information of Enterprises and Institutions" (Order No. 31 of the Ministry of Environmental Protection)

3 Terms and definitions

The following terms and definitions apply to this standard. 3.1 Gasoline filling station The new construction, reconstruction and expansion of oil and gas recovery facilities of the station shall be implemented in accordance with the requirements of newly-built enterprises.

4 Oil and gas emission control requirements

4.1 Basic requirements 4.1.1 The oil and gas discharged during unloading, storage and refueling at gas stations shall be controlled by means of oil and gas recovery based on closed collection. 4.1.2 Gas stations shall establish technical files such as oil and gas recovery construction drawings, oil and gas recovery system testing and verification, system parameter settings, etc. Gas station oil and gas recovery system management, operating procedures, regular inspection, maintenance, repair and record keeping. 4.1.3 Gas stations shall design, construct, and maintain sampling ports or sampling test flats in accordance with the requirements of environmental monitoring management regulations and technical specifications. station. 4.1.4 The oil and gas recovery system, oil and gas processing device, and online monitoring system shall adopt standardized connections. 4.1.5 During the design and construction of oil and gas recovery including the control of oil and gas emissions from refueling, the online monitoring system, oil and gas treatment Equipment pipelines such as equipment are buried in advance. 4.2 Unloading oil and gas emission control 4.2.1 The submerged oil unloading method shall be adopted, and the height of the oil outlet of the unloading pipe from the bottom of the tank shall be less than.200 mm. 4.2.2 The oil unloading and vapor recovery interface should be installed with a shutoff valve (or sealed quick coupling) and cap with a nominal diameter of 100 mm. Some gas stations have taken unloading oil and gas emission control measures, but the interface size does not match, the variable diameter connection can be adopted. 4.2.3 The connecting hose shall be connected to the unloading truck with a sealed quick connector with a nominal diameter of 100 mm. 4.2.4 All oil and gas pipeline discharge ports should be equipped with pressure/vacuum valves according to the requirements of GB 50156.If there are valves, the valves should be kept open Status; gasoline discharge pipe without pressure/vacuum valve should be kept normally closed. 4.2.5 The underground pipeline connecting the exhaust pipe should slope towards the oil tank, the slope should not be less than 1%, and the nominal diameter of the pipeline should not be less than 50 mm. 4.2.6 When unloading oil, ensure that the unloading oil vapor recovery system is airtight. Before unloading the oil, the unloading hose and the vapor recovery hose should be connected with the oil transport vehicle tank The vehicle and the buried oil tank are tightly connected, and then the oil and gas recovery pipeline valve is opened, and then the oil unloading pipeline valve is opened for oil unloading operation. 4.2.7 After unloading the oil, close the valves related to the unloading hose and the vapor recovery hose, and then disconnect the unloading hose and the vapor recovery hose. 4.3 Control of oil and gas emissions from storage 4.3.1 All components that affect the tightness of oil and gas storage, including oil and gas pipelines and connected flanges, valves, quick connectors, and other related components The related components should be kept tightly closed under normal working conditions, and the concentration of oil and gas leakage meets the requirements of the closed point limit of the oil and gas recovery system of this standard. 4.3.2 When infrared cameras are used to detect the airtight points of the oil and gas recovery system, there should be no oil and gas leakage. 4.3.3 Buried oil tanks should use electronic level gauges for gasoline tightness measurement. 4.3.4 Oil spill control measures that meet the relevant regulations of GB 50156 shall be adopted. 4.4 Refueling oil and gas emission control 4.4.1 The oil and gas generated by refueling shall be collected in a closed manner with vacuum assist. 4.4.2 The oil and gas recovery pipeline should be sloped towards the oil tank, and the slope should not be less than 1%. The liquid collection can be set if it cannot meet the slope requirements due to the terrain limitation The condensate in the collector and the liquid collector should be sealed and recovered to a low-grade gasoline tank. 4.4.3 The fueling hose should be equipped with a pull-off stop valve to prevent oil spilling and dripping when fueling. 4.4.4 When the light vehicles using ORVR in the jurisdiction reach 20% of the vehicle population, the oil and gas recovery system and online monitoring system should

Appendix A

(Normative appendix) Liquid resistance detection method A.1 Scope of application This appendix is applicable to the detection of the liquid resistance of the underground oil and gas recovery pipeline from the tanker to the buried oil tank, and it is applicable to the ground from each tanker to the buried tank. Lower the oil and gas recovery pipeline for liquid resistance detection. Special attention. The safety production regulations of gas stations should be strictly followed during testing. A.2 Detection principle and overview A.2.1 Fill the oil and gas recovery pipeline with nitrogen at the specified nitrogen flow rate to simulate the oil and gas passing through the oil and gas recovery pipeline. A.2.2 Use a pressure gauge or equivalent device to detect the liquid resistance of the gas passing through the pipeline, and understand the resistance to the gas due to various reasons in the pipeline The degree is used to judge whether it affects the oil and gas recovery. A.3 Deviation and interference A.3.1 Any leaks in related oil and gas pipelines will result in lower liquid resistance measurements. A.3.2 If you wait for the nitrogen flow to stabilize for less than 30s before starting the test, an incorrect liquid resistance measurement value will be generated. A.4 Testing equipment A.4.1 Nitrogen and nitrogen cylinders. Use commercial grade nitrogen, a high-pressure nitrogen cylinder with a two-stage pressure regulator and a 6.9kPa pressure relief valve. A.4.2 Pressure gauge. Use the pressure gauges described in A.5.1, A.5.2 and A.5.3. A.4.3 Flowmeter. Use the flowmeter described in A.5.4 and assemble it with the pressure gauge to form a liquid resistance detection device (see Figure A.1). A.4.4 Stopwatch. Use the stopwatch described in A.5.5. A.4.5 Three-way detection connector. Equipment reserved for testing on the refueling vapor recovery standpipe (see Figure A.2). A.4.6 Hose. It is used to connect the nitrogen outlet of the liquid resistance detection device to the three-way detection joint, and fill the gas recovery pipeline with nitrogen through a hose. A.4.7 Grounding device. Equipment and installation methods should comply with relevant regulations. The minimum scale is 5 Pa. A.5.3 The full scale range of the electronic pressure measuring device (0～2.5) kPa, the maximum allowable error is 0.5% of the full scale; the full scale range (0～2.5) 5.0) kPa, the maximum allowable error is 0.25% of full scale. A.5.4 The range of the flow meter is (0～100) L/min, the maximum allowable error is 2% of the full range, and the minimum scale is 2L/min. A.5.5 The maximum allowable error of the stopwatch is within 0.2s. A.5.6 All measuring instruments should be calibrated in accordance with measurement standards. A.6 Testing procedures A.6.1 Open the bottom basin of the inspected fuel dispenser and find the tee and inspection joints reserved on the refueling vapor recovery standpipe. A.6.2 Connect the liquid resistance detection device with the three-way detection joint through a hose. A.6.3 Ground the nitrogen cylinder and connect the nitrogen pipe to the nitrogen inlet connector of the liquid resistance detection device. A.6.4 Open the oil and gas interface valve of the unloading oil and gas recovery system of the corresponding oil tank. A.6.5 Open the nitrogen cylinder and set the pressure of the low pressure regulator to 35 kPa. Use the flow meter control valve to adjust the nitrogen flow rate, the lowest from Table 1 The nitrogen flow starts, and the liquid resistances corresponding to the 3 flows are detected respectively. Before reading the pressure gauge value, the time for the nitrogen flow to stabilize should be longer than 30s. A.6.6 If any of the 3 liquid resistance test values is greater than the maximum pressure limit specified in Table 1, the gas station liquid resistance test fails. If the test value cannot be determined due to the jitter of the pressure gauge pointer, the fluid resistance test is deemed to be unqualified. A.6.7 Remove the hose connected to the three-way detection joint and restore the original connection of the oil and gas recovery pipeline. A.6.8 Close the oil and gas interface valve of the corresponding oil tank. A.7 Inspection records Refer to Table G.1 in Appendix G for the record of liquid resistance test results of oil and gas recovery pipelines.

Appendix B

(Normative appendix) Tightness detection method B.1 Scope of application This appendix is applicable to the airtightness testing of gas station oil and gas recovery systems. Special attention. The safety production regulations of gas stations should be strictly followed during testing. B.2 Detection principle and overview B.2.1 Use nitrogen to pressurize the oil and gas recovery system to 500 Pa, allowing the system pressure to decay. The residual pressure value after detecting 5min is in accordance with Table 2 Set the minimum residual pressure limit for comparison. If it is lower than the limit, it indicates that the system leakage is beyond the allowable range. B.2.2 For new, renovated, or expanded gas stations, the inspection should be carried out after the oil and gas recovery system is installed and meets the requirements for use. B.2.3 The inspection is carried out at the refueling vapor recovery standpipe. B.2.4 For non-connected buried oil tanks, each buried oil tank shall be tested for tightness. B.3 Deviation and interference B.3.1 Only gaseous nitrogen can be used for detection. The nitrogen flow rate charged into the system exceeds 100L/min, which will cause deviation of the test results. B.3.2 If an oil and gas treatment device is connected to the oil and gas recovery system, the power supply of the collection unit and the oil and gas treatment device should be turned off during testing. B.3.3 If the electronic pressure gauge has thermal deviation, there should be at least a 15min warm-up process, and then a 5min drift check should be done. in case If the drift exceeds 2.5Pa, this instrument cannot be used. B.4 Testing equipment B.4.1 Nitrogen and nitrogen cylinders. Same as A.4.1. B.4.2 Pressure gauge. Use the pressure gauges described in B.5.1 and B.5.2. B.4.3 Flowmeter. Same as A.4.3, assembled together with the pressure gauge to form a tightness testing device (see Figure A.1). B.4.4 Stopwatch. Same as A.4.4. B.4.5 Three-way detection connector. Same as A.4.5. B.4.6 Hose. Same as A.4.6. B.4.7 Grounding device. Same as A.4.7. B.4.8 Leak detection solution. Any solution that can be used to detect gas leakage is used to test the tightness of system components. B.5 Sensitivity, range and accuracy B.5.1 The minimum diameter of the dial of the mechanical pressure gauge is 100 mm, the range (0～750) Pa, and the maximum allowable error is 2% of the full range. The minimum scale is 25Pa. B.5.2 The full scale range of the electronic pressure measuring device (0～2.5) kPa, the maximum allowable error is 0.5% of the full scale; the full scale range (0～2.5) 5.0) kPa, the maximum allowable error is 0.25% of full scale. B.5.3 The minimum oil and gas space of a single oil tank should be 3800L or 25% of the tank volume, whichever is less. The maximum joint of the connected oil tank The calculated oil and gas space should not exceed 95000L. The above does not include the volume of all oil and gas pipelines. B.5.4 The flow range of the nitrogen gas charged is (30-100) L/min. B.5.5 The flowmeter is the same as A.5.4. B.5.6 The stopwatch is the same as A.5.5. B.5.7 All measuring instruments should be calibrated in accordance with measurement standards. B.6 Pre-test procedures B.6.1 Safety warnings to be followed B.6.1.1 Only nitrogen is allowed to pressurize the system. B.6.1.2 The nitrogen cylinder used for testing should be equipped with a 6.9kPa pressure relief valve. B.6.1.3 The ground wire should be grounded during the process of filling nitrogen into the system. B.6.2 Preparation before testing B.6.2.1 Within 3 hours before the test or during the test, no large quantities of oil should enter or leave the oil storage tank. B.6.2.2 There shall be no refueling operation 30 minutes before and during the test. B.6.2.3 All fueling guns are correctly hung on the fueling machine. B.6.2.4 If a check valve is used on the oil and gas recovery pipeline or an oil and gas recovery pump is used so that the gas cannot be reversed in the system, it can be set Set up a short bypass line with a shut-off valve for tightness testing. B.6.2.5 Confirm that the oil level of the oil storage tank is higher than the bottom outlet of the submerged oil discharge pipe. B.6.2.6 All pressure measuring devices should be calibrated with standard pressure gauges or inclined pressure gauges before testing. Respectively for full scale 20%, 50% and 80% are calibrated, the accuracy should be within 2% of each calibration point, and the calibration frequency should not exceed 90 days. B.6.2.7 Any electronic pressure gauge should be preheated and drift checked before use (see B.3.3). B.6.3 Obtain the current oil storage capacity of each buried oil tank, and obtain the actual volume of each buried oil tank from the gas station records. Practical The current oil storage capacity is subtracted from the volume to calculate the oil and gas space of each buried oil tank. B.6.4 Use formula B.1 to calculate the approximate time required to pressurize the system to 500Pa. B.6.5 The inspection is carried out at the riser of the oil and gas recovery pipeline. Open the bottom basin of the inspected fuel dispenser and find the reserved tee and inspection joints. B.6.6 Connect the tightness test device with the nitrogen cylinder and the three-way test joint with a hose. Open the shut-off valve on the short-circuit pipeline. Read tank And the initial pressure of the underground pipeline, if the initial pressure is greater than 550Pa, first check according to the corresponding pressure drop limit in Table 2, such as If the pressure drop value meets the corresponding limit requirements, it is determined that the airtightness meets the standard; if the pressure drop value exceeds the corresponding limit value, the pressure is released Make the pressure of the oil tank and underground pipeline less than 550Pa before testing. B.7 Testing procedures B.7.1 Pressurize the oil and gas recovery system (or independent subsystem). Open the valve of the nitrogen cylinder and set the pressure of the low pressure regulator to 35kPa, Adjust the nitrogen flow rate in the range of (30～100) L/min and start the stopwatch. Fill it to about 550Pa, if it reaches 500Pa during the filling process If the required time exceeds 2 times the value calculated in formula B.1, the detection is stopped, indicating that the system does not have the detection conditions. B.7.2 When the pressure reaches about 550Pa, close the nitrogen valve, and adjust the pressure relief valve to turn on the stopwatch when the pressure drops to the initial pressure of 500Pa. B.7.3 Record the system pressure every 1 minute. After 5 minutes, record the final system pressure. B.7.4 Release the pressure of the gas recovery system according to the safety regulations of the gas station. B.7.5 Remove the hose connected to the three-way detection joint and restore the original connection of the oil and gas recovery pipeline. B.7.6 If the oil and gas recovery system consists of several independent oil and gas recovery subsystems, then each independent subsystem shall be tested for tightness.

Appendix C

(Normative appendix) Gas-liquid ratio detection method C.1 Scope of application This appendix applies to the gas-liquid ratio detection of the gas-liquid-gas recovery system of gas stations. Special attention. The safety production regulations of gas stations should be strictly followed during testing. C.2 Detection principle and overview Install a close-fitting adapter at the nozzle of the fuel gun. The adapter is connected to the gas flow meter, and the gas flow passes through the gas flow meter first. Then enter the vapor collection hole on the nozzle of the fuel gun. The ratio of the measured gas volume to the gasoline volume measured by the dispenser at the same time is called gas-liquid ratio. Through the detection of gas-liquid ratio, the recovery effect of the oil and gas recovery system can be understood. C.3 Deviation and interference C.3.1 If the nozzle of the fuel gun and the adapter cannot be matched well for various reasons, the test cannot be performed. C.3.2 If the fueling flow of the tested fueling gun cannot reach more than 20L/min, the test cannot be performed. C.3.3 If the detected fuel nozzle causes gasoline to enter the detection device, the gas-liquid ratio detection value of this fuel nozzle will be regarded as invalid. C.3.4 Before testing, do not empty the gasoline in the gas path of the refueling hose and the gas pipe of the dispenser, otherwise the test results will be biased. C.3.5 Before the gas-liquid ratio test, the O-ring of the gas-liquid ratio adapter should be lubricated correctly, otherwise the test result will be biased. C.4 Testing equipment C.4.1 Adapter. Use a gas-liquid ratio adapter that matches the fueling gun. The adapter should be able to isolate the gas-liquid collection hole of the fueling gun. It is connected to the gas flow meter through an oil-resistant hose, and the adapter installation is shown in Figure C.1. C.4.2 Gas flow meter. Use a positive displacement flow meter to measure the volume of the recovered gas. The installation of the gas flow meter is shown in Figure C.1. C.4.3 The gas flow meter inlet tee. The three-way pipe is used to connect the oil and gas loop pipe and the gas balance pipe (see Figure C.1). C.4.4 Liquid flow meter. Use the flow meter on the fuel dispenser to measure the volume of gasoline added during the test. C.4.5 Oil drums for testing. A portable container that meets fire safety and is used to contain the gasoline added during the test. The materials and use should be full Meet the fire safety requirements. The oil drums and supporting pipelines and components used for testing are shown in Figure C.2 and Figure C.3. C.4.6 Stopwatch. Same as A.4.4. C.4.7 Lubricants. Grease or spray-type lubricant to ensure the air-to-liquid ratio between the O-ring of the adapter and the nozzle of the nozzle. The maximum allowable error is ±2%, and the pressure drop when the gas flow is 7.5 L/min and 375 L/min is not more than 10 Pa and 175 Pa, respectively. C.5.2 The length of the hose connecting the adapter and the gas flow meter is in the range of 1000 to 1800 mm. C.5.3 The inner diameter of the inlet connecting pipe of the gas flow meter shall be at least 50 mm, and the length of the inlet pipe of the connecting pipe shall be in the range of 150-450 mm. C.5.4 The capacity of the oil drum for testing shall be at least 80 L. C.5.5 The stopwatch is the same as A.5.5. C.5.6 All measuring instruments should be calibrated in accordance with measurement standards. C.6 Pre-test procedures Before starting the following inspection procedures, check item by item according to the list of equipment for the oil and gas recovery system listed in the assessment report. The gas-liquid ratio test cannot be performed. C.6.1 Install the oil drum components and gas flowmeter for testing according to Figure C.3, and ensure that the grounding device is correctly connected. C.6.2 If there are other fueling guns sharing the same vacuum pump with the tested fueling gun, the gas-liquid ratio test should be performed when the other fueling guns are not sealed. Under the circumstances. For the vapor recovery system with "one pump with multiple guns (< 4 guns)", it should be tested when at least 2 fueling guns are being refueled at the same time; For the "one pump with multiple guns (≥4 guns)" oil and gas recovery s...

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