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QC/T 245-2002 (QCT 245-2002)

Chinese Standard: 'QC/T 245-2002'
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Standard ID QC/T 245-2002 (QC/T245-2002)
Description (Translated English) Compressed natural gas vehicles dedicated device technology
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard T47
Word Count Estimation 6,686
Date of Issue 2003-03-06
Date of Implementation 2003-08-01
Older Standard (superseded by this standard) QC/T 245-1998
Adopted Standard ECE R110, NEQ; ISO 15500, NEQ
Drafting Organization Chongqing Automobile Research Institute
Administrative Organization National Automotive Standardization Technical Committee
Regulation (derived from) Ministry of Industry and Information Technology Announcement No. 2 of 2017
Summary This standard specifies the compressed natural gas vehicle special equipment (hereinafter referred to as a dedicated device) definitions and technical requirements. This standard applies to used in accordance with the requirements of GB 18047 compressed natural gas vehicle (hereinafter referred to as CNG), rated working pressure of 20MPa dedicated devices.

QC/T 245-2002
File No.. 11686-2003
Partly replacing QC/T 245-1998
Technical requirements for specific components
of vehicles using compressed natural gas (CNG)
Issued by. State Economic and Trade Commission
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Technical requirements ... 5 
This Standard non-equivalently adopts ECE R110 “Uniform provisions concerning the
approval of specific components of motor vehicles using compressed natural gas
(CNG) in their propulsion system and vehicles with regard to the installation of specific
components of an approved tire for the use of compressed natural gas (CNG) in their
propulsion system” and ISO 15500 “Road vehicles - Compressed natural gas (CNG)
fuel system components”. This Standard partly replaces technical requirements for the
specific components of vehicles using compressed natural gas (CNG) in QC/T 245
“Provisions concerning the specific components of vehicles using compressed natural
gas (CNG) and their installation”.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of the Nation al Technical Committee of
Auto Standardization.
Drafting organizations of this Standard. Chongqing Automotive Research Institute,
Nanchong Machinery Plant of Sichuan Petroleum Administrative Bureau, Sichuan
Syenki Electronics Co., Ltd.
Main drafters of this Standard. Chen Wanying, Wang Kai, Zhang Haihui, Deng Jie and
Li Gang.
This Standard is issued for first-time.
This Standard shall be interpreted by the National Technical Committee of Auto
Technical requirements for specific components of
vehicles using compressed natural gas (CNG)
1    Scope 
This Standard specifies the definitions and technical requirements of specific
components of vehicle consuming compressed natural gas (hereinafter referred as
the specific components).
This Standard applies to the specific components consuming the compressed natural
gas (hereinafter referred as CNG) as specified in GB 18047 with the rated working
pressure of 20 MPa.
2    Normative references 
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB 17258 Steel cylinders for the on-board storage of compressed natural gas as
a fuel for automotive vehicles
GB 18047 Compressed natural gas as vehicle fuel
GB/T 17895 Natural gas vehicle and liquefied petroleum gas vehicle - Vocabulary
GB/T 14976 Stainless steel seamless tubes for fluid transport
GB/T 18363 Filling receptacle of CNG vehicle
QC/T 625 Metallic coatings and conversion coatings for automobile
QC/T 671 Pressure regulator of CNG vehicle
QC/T 674 Electromagnetic valve of CNG vehicle
QC/T 675 Electromagnetic valve of gasoline vehicle
4.1.3 The parts of specific component whose correct and safe function is liable to be
influenced by CNG, high pressure or vibrations shall fulfill the provisions as stipulated
in GB/T 18363, QC/T 671, QC/T 674, QC/T 675 and GB 17258.
4.1.4 The materials of the parts of specific component which are in contact with CNG
shall be compatible with it. If they are made of black metal, measures to prevent
corrosion such as electroplating, chemical treatment or painting shall be adopted. The
coating or plating layer or chemical treated layer of the part shall fulfill the provisions
as stipulated in QC/T 625.
4.2 System requirements
4.2.1 A CNG system shall contain at least the following specific components.
a) Filling unit or receptacle;
b) Automatic air cylinder;
c) Accessories to automatic air cylinder;
d) Air pressure (volume) indicator;
e) Stop valve;
f) High-pressure line and joint;
g) Lines;
h) Electromagnetic valve;
i) Pressure adjustor;
j) Gas mixer or injector;
k) Low pressure air line and circulating water hose;
l) Excess flow valve;
m) Filter.
4.2.2 The CNG system may also include the following specific components.
a) Gas-tight housing;
b) Non-return valve;
c) Dual-use fuel control switch or dual fuel control switch;
The manual valve for natural gas compression shall be mounted between air cylinder
and pressure regulator on which the rated working pressure and the flow of media
shall be indicated.
4.3.5 Gas-tight housing
The gas-tight housing shall have a vent outlet with the total cross section area greater
than 450 mm2.
4.3.6 Pressure regulator The pressure regulator shall be mounted with heater and defroster; The pressure regulator shall be easy to discharge impurities; The pressure regulator shall have a part which can regulate the pressure of
pressure relief chamber manually; When class one pressure regulation of pressure regulator fails, excess
pressure protection device shall work.
4.3.7 Filter
CNG filter shall be mounted between air cylinder and pressure regulator. The filter
element shall be washable or replaceable. The filter shall be separately mounted
inside the line or in the pressure regulator in a combined way.
4.3.8 Mixer
Flashback arrestor shall be mounted in the case membrane type mixer is used.
4.3.9 Fuel control switch a......
Related standard: QC/T 245-2017    QC/T 247-2017
Related PDF sample: QC/T 245-2017    QC/T 247-2017