QC/T 755-2006 (QCT 755-2006)

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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.