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GB 20952-2007: Emission standard of air pollutant for gasoline filling stations
GB 20952-2007
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.040.40
Z 60
Emission standard of air pollutant for gasoline filling
stations
ISSUED ON: JUNE 22, 2007
IMPLEMENTED ON: AUGUST 01, 2007
Issued by: State Environmental Protection Administration;
General Administration of Quality Supervision, Inspection and
Quarantine.
Table of Contents
Foreword ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Gasoline vapor emission control and limit ... 7 
5 Technical measures ... 11 
6 Standard implementations ... 13 
Annex A (normative) Testing methods for liquid resistance ... 15 
Annex B (normative) Testing methods for vapor recovery system tightness .. 19 
Annex C (normative) Testing methods for air to liquid volume ratio ... 24 
Annex D (normative) Testing methods for vapor emission processing equipment
... 33 
Annex E (informative) Calibration method for on-line monitoring system ... 36 
Annex F (informative) Testing report of gasoline filling station ... 39 
Emission standard of air pollutant for gasoline filling
stations
1 Scope
This Standard specifies gasoline vapor emission limits of gasoline filling
stations, control technical requirements and testing methods.
This Standard is applicable to gasoline vapor emission management of existing
gasoline filling stations as well as environmental impact assessment, design,
completion acceptance of new, modified and expanded gasoline filling station
projects and gasoline vapor emission management after completion.
2 Normative references
The provisions in the following documents become part of this Standard,
through reference in this Standard. For undated documents, the latest version
applies to this Standard.
GB 50156, Code for design and construction of automobile gasoline and gas
filling station
GB/T 16157 The determination of particulates and sampling methods of
gaseous pollutants emitted from exhaust gas of stationary source
HJ/T 38 Stationary source emission - Determination of nonmethane
hydrocarbons - Gas chromatography
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 gasoline filling station
A special place for filling gasoline into car fuel tank.
3.2 gasoline vapor
Volatile organic compounds (non-methane total hydrocarbons) generated
during the filling, unloading and storage of gasoline at gasoline filling stations.
3.3 vapor emission concentration
Under standard conditions (temperature is 273K, pressure is 101.3kPa), the
mass of non-methane total hydrocarbons contained in every m3 of dry gas
discharged, in g/m3.
3.4 vapor recovery system for gasoline filling station
A vapor recovery system for gasoline filling station is composed of vapor
recovery system for unloading, closed storage of gasoline, vapor recovery
system for filling, online monitoring system, and vapor emission processing
equipment. The role of this system is to TRANSFER the gasoline vapor
generated during the unloading, storage and filling of the gasoline filling station,
through closed collection, storage and sending into the tank of a tank car, and
TRANSPORT to the oil storage depot for centralized recovery into gasoline.
3.5 vapor recovery system for unloading gasoline
A system that collects the gasoline vapor generated when a tank car unloads
gasoline, through a closed manner, into the tank of the tank car.
3.6 vapor recovery system for filling gasoline
A system that collects the gasoline vapor generated when a tank car fills
gasoline, through a closed manner, into the underground storage tank.
3.7 overfill protection measurement
The overfill that might happen when controlling gasoline unloading by using
shut-off valve or float valve or other anti-overflow measures.
3.8 underground storage tank
A fully-buried storage tank under the ground.
3.9 pressure/vacuum valve
Also known as P/V valve, vent valve, mechanical breathing valve, which can
adjust the pressure difference between the inside and outside of the tank so
that the gas inside and outside the tank can communicate.
3.10 dynamic back pressure
The resistance when condensate liquid stays in the gasoline vapor pipeline or
causes gas to pass through the pipeline for other reasons.
3.11 vapor recovery system tightness
The sealing degree of vapor recovery system under certain gas pressure.
3.12 air to liquid volume ratio
The ratio of the volume of gasoline vapor collected when filling to the volume of
gasoline added to the tank at the same time.
3.13 vacuum-assist
In the vapor recovery system for filling gasoline, use the vacuum generator to
assistant recovering the gasoline vapor generated during gasoline filling.
3.14 on-line monitoring system
The system that online monitors whether the air to liquid volume ratio in the
vapor recovery process for filling gasoline as well as the vapor recovery system
tightness of the vapor recovery system and pipeline liquid resistance are normal.
When abnormality is found, it can remind the operator to take corresponding
measures, and can record, store, process and transmit monitoring data.
3.15 vapor emission processing equipment
The device that recovers the gasoline vapor discharged from the vapor
recovery system for gasoline filling station, through methods such as attaching,
absorption, condensation, membrane separation.
4 Gasoline vapor emission control and limit
4.1 The gasoline vapor emitted during unloading, storing and filling of gasoline
filling station shall use the gasoline vapor recovery method based on closed
collection to control.
4.2 Technical assessment
4.2.1 The vapor recovery system for filling gasoline shall conduct technical
assessment and issue a report. The assessment mainly includes: investigating
and analyzing technical information, verifying relevant certification documents,
evaluating air to liquid volume ratio of multiple flows and guns, testing
operations of at least 3 months in concession, providing rang of air to liquid
volume ratio of which the control efficiency is greater than or equal to 90%,
listing equipment of vapor recovery system.
4.2.2 The vapor emission processing equipment (hereinafter referred to as the
processing equipment) and on-line monitoring system shall conduct technical
assessment and issue a report. The assessment mainly includes: investigating
and analyzing technical information, verifying relevant certification documents,
providing proof of actual use in China or abroad, testing operations of at least
3 months in concession.
5 Technical measures
5.1 Emission control of gasoline vapor of unloading gasoline
5.1.1 It shall use submersible unloading method. The height of the gasoline
outlet of the unloading pipe from the bottom of the tank shall be less than
200mm.
5.1.2 The gasoline unloading and oil recovery interface shall be installed with
DN100mm shut-off valve, sealed quick connector and cap. For the exiting
gasoline filling stations, if unloading emission control measures have been
taken but the interface size does not match, it may use a reducing diameter one
to connect.
5.1.3 The connecting hose shall be connected to the unloading truck with a
DN100mm sealed quick connector. No residual oil can be left in the connecting
hose after unloading.
5.1.4 All gasoline vapor pipeline emission ports shall be equipped with
pressure/vacuum va...