QC/T 755-2020_English: PDF (QC/T755-2020)
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Technical Requirements of Fuel-Gas System for LNG Vehicles
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QC/T 755-2020
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| QC/T 755-2006 | English | 90 |
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Technology requirements of special equipment for LNG vehicle
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| Standard ID | QC/T 755-2020 (QC/T755-2020) | | Description (Translated English) | Technical Requirements of Fuel-Gas System for LNG Vehicles | | Sector / Industry | Automobile & Vehicle Industry Standard (Recommended) | | Classification of Chinese Standard | T47 | | Word Count Estimation | 18,133 | | Date of Issue | 2020-12-09 | | Date of Implementation | 2021-04-01 | | Older Standard (superseded by this standard) | QC/T 755-2006 | | Regulation (derived from) | Ministry of Industry and Information Technology Announcement No. 48 (2020) | | Issuing agency(ies) | Ministry of Industry and Information Technology | | Standard ID | QC/T 755-2006 (QC/T755-2006) | | Description (Translated English) | Technology requirements of special equipment for LNG vehicle | | Sector / Industry | Automobile & Vehicle Industry Standard (Recommended) | | Classification of Chinese Standard | T47 | | Word Count Estimation | 10,188 | | Date of Issue | 2006-07-26 | | Date of Implementation | 2007-02-01 | | Quoted Standard | GB/T 14976; GB/T 3765; GB/T 19204; GB/T 17895; GB 7258; GB 18442; GB/T 20734 | | Drafting Organization | Shanghai Jiaotong University | | Administrative Organization | National Automotive Standardization Technical Committee | | Regulation (derived from) | Development and Reform Commission Notice 2006/45 | | Summary | This standard provides for liquefied natural gas (LNG) as fuel vehicle special equipment technical condition. This standard applies to liquefied natural gas is not greater than the rated working pressure of 1. 6MPa LNG single fuel vehicles. |
QC/T 755-2020
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.080
T 47
Replacing QC/T 755-2006
Technical Requirements of Fuel-Gas System for LNG
Vehicles
ISSUED ON: DECEMBER 09, 2020
IMPLEMENTED ON: APRIL 01, 2021
Issued by: Ministry of Industry and Information Technology of PRC
Technical Requirements of
Fuel-Gas System for LNG Vehicles
1 Scope
This Document specifies the terms and definitions of automobile fuel-gas systems that
use liquefied natural gas (hereinafter referred to as LNG) fuel, the composition and
technical requirements of fuel-gas system of LNG vehicles, as well as the specific
requirements for gas storage components, gas supply components, refuelling
components and safety components.
This Document applies to LNG vehicles or dual-fuel and bi-fuel vehicles that use LNG
and other fuels. The nominal working pressure of the gas cylinder of the fuel-gas
system is no more than 1.6MPa; and the working pressure of the gas supply
components is no more than 35MPa.
2 Normative References
The following documents are essential to the application of this Document. For the
dated documents, only the versions with the dates indicated are applicable to this
Document; for the undated documents, only the latest version (including all the
amendments) is applicable to this Document.
GB/T 3 Ordinary Thread End, Shoulder Distance, Undercut and Chamfer
GB/T 193 General Purpose Screw Threads - Diameters and Pitches
GB/T 197 General Purpose Metric Screw Threads - Tolerances
GB/T 1220 Stainless Steel Bars
GB/T 1226 General Pressure Gauge
GB/T 1804 General Tolerances - Tolerances for Linear and Angular Dimensions
without Individual Tolerance Indications
GB/T 2408-2008 Plastics - Determination of Burning Characteristics - Horizontal
and Vertical Test
GB/T 3103.1-2002 Essential Oils and Aromatic Extracts – Determination of
GB/T 36123 Technical Requirements for Gas Leakage Alarm Device of Gas
Vehicle
GB/T 36883 Technical Specification of LNG Vehicle
JT 230 Rubber Belt of Electrostatic Conductivity
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 17895,
GB/T 13005, GB/T 34510, GB/T 19204 and the following apply.
3.1 Fuel-gas system for LNG vehicles
A complete system that consists of LNG gas storage components, gas supply
components, refuelling components and safety components installed on LNG vehicles.
3.2 Vehicular tank
It is a pressure vessel (hereinafter referred to as a gas cylinder) that is used by LNG
vehicles to store and supply LNG fuel.
3.3 Accessories
In the gas storage parts, the liquid level sensor, liquid level transmitter, economic
regulating valve, one-way valve, pressure gauge, relief valve (primary relief valve,
auxiliary relief valve), pressure relief pipeline and other devices other than gas
cylinders.
3.3.1 Liquid level sensor
A device that is installed in the gas cylinder, used to reflect the real-time liquid level of
LNG, and can send out liquid level signal.
3.3.2 Liquid level transmitter
A device that converts the input signal of the liquid level sensor into a signal that can
be received by the liquid level indicator.
3.3.3 Liquid level indicator
An instrument that is installed on the operating panel of the cab to display the
remaining amount of LNG in the gas cylinder.
3.3.4 Prime relief valve
relief valve (primary relief valve, auxiliary relief valve), pressure relief pipeline
and venting globe valves, etc., and can be equipped with pressure sensors. For
gas storage components with forced liquid supply function, it shall also include
forced liquid supply, control and driving devices;
--- Gas supply components shall include liquid supply shutoff valve, supply line flow
regulation valve, liquid supply pipeline (pipeline and loose joints, etc.) and
vaporizer, one-way valve, pressure reducing regulator, solenoid valve, pressure
gauge, etc., and can be equipped with buffer tank, gas temperature control
device, gas recovery device and pressure sensor and other components;
--- Refilling components shall include filling port, air return port, connecting pipeline
and one-way valve, etc.;
--- Safety components shall include gas leakage alarm devices, gas cylinder
protection devices and rubber belt of electrostatic conductivity for motor vehicle,
etc.
5 Technical Requirements for Fuel-Gas System
5.1 General requirements
5.1.1 The fuel gas system shall be manufactured in accordance with the product
drawings and other technical documents approved by the prescribed procedures; and
shall comply with the provisions of GB/T 36883.
5.1.2 All components in the fuel gas system shall have operating conditions and quality
inspection certificates provided by the manufacturer; and the explosion-proof
performance of electrical components shall comply with the provisions of GB 3836.1.
5.1.3 The installation of the fuel gas system shall comply with the provisions of GB/T
20734 and GB 19239.
5.1.4 When one of the following situations occurs, the fuel gas system shall be able to
automatically cut off the LNG supply:
a) The ignition switch is not turned on;
b) The engine is not running;
c) The LNG gas supply pipeline is broken, falling off, etc.
5.1.5 The gas cylinders in the fuel gas system shall be able to adapt to the working
environment temperature requirements specified in GB/T 34510-2017. Other parts and
components shall be able to adapt to the respective working environment temperature
the joint should be a double-ferrule joint or end face sealing joint.
5.4.3 The test pressure of the fuel gas hose and the circulating water hose shall be
twice the working pressure; and the burst pressure shall be no less than 4 times the
working pressure.
6 Gas Storage Parts
6.1 Gas cylinder
6.1.1 Bursting discs shall not be installed in gas cylinders. The gas cylinder shall
comply with the provisions of GB/T 34510 or GB/T 24159.
6.1.2 The gas cylinder shall be provided with a permanent nameplate identification;
which shall comply with the relevant provisions of GB/T 34510. When installing the gas
cylinder on the vehicle, it must not cover the nameplate mark.
6.1.3 The pipelines of LNG entering and exiting cylinders need to have indication
marks to indicate the function of the pipeline and the direction of fluid flow. The marks
should not be blurred due to "frosting".
6.1.4 If the gas cylinder is equipped with an LNG pump with compulsory liquid supply
function, there shall be an LNG pump working pressure mark on it.
6.2 Accessories
6.2.1 General requirements
6.2.1.1 The working pressure of all accessories of the gas cylinder shall be no less
than the nominal working pressure of the gas cylinder and the working pressure of this
part.
6.2.1.2 During the inspection period of gas cylinders, the performance of all seals shall
comply with the provisions of 5.1.6.
6. 2. 2 Liquid level device
6.2.2.1 The liquid level transmitter shall meet the following requirements:
--- the function of fault diagnosis, the sensor short circuit, open circuit and abnormal
data sent by the transmitter shall be displayed on the instrument.
--- If the protection level reaches IP67, the explosion-proof performance meets the
intrinsic safety requirements in GB 3836.1 and GB 3836.4, and the
electromagnetic compatibility meets the relevant requirements of 4.5, 4.6, 4.7,
4.8 in GB 34660-2017, and GB/T 19951.
GB/T 20734 and GB 19239.
6.2.3.6 The instruction manual of relief valve product shall clearly explain the periodic
calibration of the relief valve.
6.2.4 Pressure relief pipeline
6.2.4.1 The fuel gas system shall be equipped with a pressure relief pipeline; and the
latter shall be able to withstand the pressure and temperature of LNG, and be able to
withstand the pressure shock when the relief valve is fully opened.
6.2.4.2 The pressure relief pipeline shall be directly connected to the gas phase space
of the gas cylinder; and the pipeline diameter shall meet the requirements for safe
discharge. At the same time, a venting globe valve shall be set in the pressure relief
pipeline; and the relief valve pipeline shall be connected in parallel with the venting
globe valve.
6.2.4.3 The pressure relief pipeline shall have automatic pressure relief (relief valve
starts pressure relief) and manual pressure relief functions.
6.2.4.4 When the gas cylinder is installed on the vehicle, the outlet of the pressure
relief pipeline shall be connected to a safe location for discharge.
6.2.4.5 When the pressure relief pipeline is arranged in the protective cover of the M3
category vehicle, the mark of "pressure relief pipeline" shall be provided. The pressure
relief pipeline below the roof and above the floor shall not be equipped with joints. The
pressure relief pipeline shall not be arranged in the door axle box; and the end shall
be set on the roof of the vehicle; and waterproof joints and rain caps shall be installed.
6.2.5 Pressure gauge
6.2.5.1 The pressure gauge shall comply with the provisions of GB/T 1226; the
minimum burst pressure shall be no lower than 4 times the nominal working pressure
of the gas cylinder; the range shall be 1.5 times ~ 3 times the working pressure; and
the accuracy shall be no lower than Level-2.5; the vibration conditions in the normal
operation environmental shall not exceed the Level-V.H.4 specified in GB/T 17214.3-
2000.
6.2.5.2 The product instruction manual of the pressure gauge shall have clear
instructions for the periodic calibration of the pressure gauge.
7 Air Supply Parts
7.1 Air supply pipeline
pressure gas not to flow back into the gas cylinder.
7.5.4 The relief pressure of the overpressure discharge device shall be no greater than
the working pressure. There shall be a manual discharge device in the pipeline; and
an automatic discharge device can be added. Other requirements of the pipeline shall
be implemented in accordance with the provisions of 5.4.
8 Filling Parts
8.1 General requirements for LNG filling device
8.1.1 The LNG filling device shall meet the requirements of GB/T 25986.
8.1.2 There shall be a one-way valve between the fuel filling port and the connecting
pipeline of the gas cylinder to ensure that the liquid does not flow back after the filling
is completed.
8.1.3 If a multi-cylinder system shares a common structure with a single filling port, a
stop valve shall be installed in each cylinder pipeline.
8.1.4 The filling device for M3 category vehicles is not allowed to be arranged in the
door axle box.
8.2 Requirements for filling opening and return gas inlet
The filling opening and the air return inlet shall have good sealing performance; and
there shall be no leakage under any circumstances. It shall be equipped with a dust
cover to prevent dust from entering the interface and affecting the automatic sealing of
the interface.
9 Safety Parts
9.1 Gas cylinder protection
9.1.1 General requirements
Corresponding protective measures can be taken according to the arrangement of the
gas cylinders. The protective mechanism of the car itself can be used, and protective
fences, bumpers, partitions and protective covers can also be installed to prevent direct
mechanical collisions or damage from the road gravels. Focus on protection for the
cylinder valve and pipeline. If the protective material is non-metallic, the flame retardant
performance of the material shall comply with the provisions of GB 8410-2006.
9.1.2 Arrangement of rear-mounted gas cylinders for N category vehicles
......
QC/T 755-2006
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Technology requirements of
special equipment for LNG vehicle
ISSUED ON. JULY 26, 2006
IMPLEMENTED ON. FEBRUARY 1, 2007
Issued by. National Development and Reform Committee
Table of Contents
Forward ... 3
1 Scope ... 4
2 Normative quotations and references ... 4
3 Terms and definitions ... 4
4 LNG vehicle special equipment ... 6
Forward
This Standard is formulated for the first time.
This Standard was proposed by and shall be under the jurisdiction of National Technical
Committee of Auto Standardization.
Drafting organizations of this Standard. Shanghai Jiaotong University, China Automotive
Technology & Research Center, and Application Technology Department of Zhongyuan
Petroleum Exploration Bureau Natural Gas.
Main drafters of this Standard. Lu Xuesheng, Gu Anzhong and Lin Wensheng.
This Standard shall be responsibly interpreted by National Technical Committee of Auto
Standardization.
Technology requirements of
special equipment for LNG vehicle
1 Scope
This Standard specifies the technical requirements of special equipment for LNG vehicle.
This Standard is applicable to mono-LNG vehicle of which the LNG nominal working
pressure is not more than 1.6MPa.
2 Normative quotations and 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/T 14976 Stainless steel seamless tubes for fluid transport
GB/T 3765 24 Cone connector - Specification
GB/T 19204 General characteristics of liquefied natural gas
GB/T 17895 Natural gas vehicle and liquefied petroleum gas vehicle - Vocabulary
GB 7258 Safety specifications for power-driven vehicles operating on roads
GB 18442 Cryo-insulation pressure vessels
GB/T 20734 Mounting requirements for liquefied natural gas vehicle special
equipment
3 Terms and definitions
Terms and definitions in GB/T17895 AND the following terms and definitions are
applicable to this Standard.
3.1
Liquefied natural gas
It is a kind of colorless fluid in the liquid state and mainly composed of methane. Its
composition may contain small amounts of ethane, propane, nitrogen or other elements
that are usually existed in natural gas. The quality complies with the requirements of
GB/T 19204. Abbreviation is LNG.
One of pressure protection and control devices for the gas tank, used for emergency
drainage when the prime relief valve is in the failure state.
3.2.7
Pressure gauge
It is an instrument that is mounted on the fuel operation panel or the gas tank, to indicate
the pressure in the gas tank.
3.2.8
Liquid level sensor
It is a device that is mounted in the gas tank to measure liquid level height of LNG and to
send liquid level signals.
3.2.9
Liquid level indicator
It is a device that is mounted on the operation panel of the driving cab and to indicate
liquid level height of LNG in the gas tank.
3.3
Special equipment
It includes all the lines and parts for liquid fuel supply, including gas tank.
3.4
Maximum allowable working pressure
Under the design temperature condition, the maximum working pressure that is allowed
by the system. Its abbreviation is MAWP.
3.5
Vaporizer
It is a heat exchanger that heat and convert the LNG into gas state, so as to reach air
inlet temperature required by the engine.
4 LNG vehicle special equipment
4.1 LNG vehicle special equipment composition
4.1.1 LNG gas tank assembly. LNG gas tank and accessories such as liquid level display
device and pressure gauge that are mounted on the gas tank.
4.1.2 Vaporizer. water-bath vaporizer, circulating water line and accessories.
4.3.4 Connector of dissimilar metals shall be avoided in the system. If it has to use
dissimilar materials for connection, then necessary anti-corrosion measurement shall be
adopted to avoid electrochemical corrosion resulting from combination of dissimilar
metals.
4.4 LNG gas tank
4.4.1 The gas tank must comply with the requirements of GB 18442 Cryo-insulation
pressure vessels.
4.4.2 LNG vehicle gas tank can adopt high vacuum multi-layer heat insulation type. Its
heat-insulating property shall make pressure of gas tank not exceed maximum allowable
working pressure, in the case of maximum filling weight of gas tank and under
environment temperature of 21°C.
4.4.3 Gas tank is allowed to continue the usage after it is vacuumed again, within its
effective usage life. However, before it is re-installed, quality test and evaluation must be
carried out according to Liquefied gas bottle management specifications, so as to ensure
that whether it can be re-used.
4.4.4 Permanent nameplate shall be set on gas tank.
a) The basic parameter nameplate for gas tank shall at least include the following
information. gas tank volume (L), maximum allowable working pressure (MPa),
manufacturing serial number, manufacturing date and manufacturer.
b) Identification mark of LNG filling connector shall indicate the maximum allowable
working pressure of gas tank. If necessary, component restriction of LNG shall also
be indicated.
c) There must be indicative marks for LNG inlet and outlet lines of gas tank, indicating
the functions of the lines and flow directions of liquid. Pay attention to that the
marks shall not be blurred because of frosting.
4.4.5 Gas tank accessories
4.4.5.1 Gas tank accessories shall be in complete and reliable, including filling line stop
valve, drain line stop valve, drain line flow regulation valve, saving regulating valve, prime
relief valve, auxiliary relief valve, pressure gauge, liquid level sensor, and liquid level
indicator.
4.4.5.2 The working pressure rating for all the accessories of gas tank shall not be lower
than its maximum allowable working pressure.
4.4.5.3 All sealing elements shall be effective within the inspection period of gas tank.
4.4.5.4 The relief valve operation pressure shall be accurate and reliable; it must be the
qualified products manufactured by professional supplier, with complete quality
inspection certificate.
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