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QC/T 245-2002 English PDF (QCT245-2002)

QC/T 245-2002 English PDF (QCT245-2002)

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QC/T 245-2002: Compressed natural gas vehicles dedicated device technology

This Standard specifies the definitions and technical requirements of specific components of vehicle consuming compressed natural gas. This Standard applies to the specific components consuming the compressed natural gas as specified in GB 18047 with the rated working pressure of 20 MPa.
QC/T 245-2002
QC
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
File No.. 11686-2003
Partly replacing QC/T 245-1998
Technical requirements for specific components
of vehicles using compressed natural gas (CNG)
ISSUED ON. MARCH 6, 2003
IMPLEMENTED ON. AUGUST 1, 2003
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
Foreword
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 Standardization.
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
4.3.6.1 The pressure regulator shall be mounted with heater and defroster; 4.3.6.2 The pressure regulator shall be easy to discharge impurities;
4.3.6.3 The pressure regulator shall have a part which can regulate the pressure of pressure relief chamber manually;
4.3.6.4 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 and line harness
The fuel control switch of dual-use fuel or dual-fuel automobile shall have clearly marked gears, which controls or shuts off the supply of natural gas or fuel. The line harness shall be wrapped fixedly. Plug type joint is preferred. Over-current protection device shall be set in circuit.
4.3.10 Excess flow valve
The excess flow valve shall be mounted between air cylinder and pressure regulator. It shall be automatically or manually reset when it returns to normal after excess flow protection.
4.3.11 Natural gas electromagnetic valve
High-voltage electromagnetic valve shall be mounted between air cylinder and

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