QC/T 644-2014 English PDF (QCT644-2014)

This Standard specifies technical requirements, test methods, inspection rules and marks, packaging, transport, storage for automobile metal fuel tank. This Standard is applicable to metal fuel tanks loaded with vehicle gasoline, vehicle diesel used for M category and N category vehicles. The metal fuel tanks of vehicle fuels such as alcohol fuel, biofuel, coal-to-liquid can refer to this Standard for implementation. The types and connection sizes of fuel tank cover and fuel filler port used for plastic fuel tank can also refer to this Standard for implementation.

QC/T 644-2014
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.40
T 13
Replacing QC/T 644-2000, QC/T 488-2000
Specifications for automobile metal fuel tank
ISSUED ON: MAY 06, 2014
IMPLEMENTED ON: OCTOBER 01, 2014
Issued by: Ministry of Industry and Information Technology of the
People's Republic of China
Appendix:
Number, name, and date of implementation of 32 automotive industry
standards
No. Standard number Standard name
Number of
standards replaced
Date of
implementation
1 QC/T 231-2014 Specification of kick-starter for motorcycles and mopeds QC/T 231-1997 October 01,
2014
2 QC/T 233-2014
Performance and measurement
method for static intensity of
motorcycles and mopeds
QC/T 233-1997 October 01, 2014
3 QC/T 66-2014 Wet clutch for moped and motorcycles QC/T 66-1993
October 01,
2014
4 QC/T 962-2014 Technical specifications for coating of motorcycles and moped October 01,
2014
5 QC/T 680-2014
General technical specifications for
voltage regulators for motorcycles and
moped
QC/T 680-2002 October 01, 2014
6 QC/T 963-2014 Drum brakes of motorcycles and mopeds wheels
October 01,
2014
7 QC/T 234-2014
General technical specifications for
steering shaft for motorcycles and
moped
QC/T 234-1997 October 01, 2014
8 QC/T 964-2014 The strength of plastic seats and their anchorages for city buses October 01,
2014
9 QC/T 644-2014 Technical specifications for automotive metallic fuel tank QC/T 644-2000
QC/T 488-2000
October 01,
2014
10 QC/T 965-2014 Driver of electric rear-view mirrors for motor vehicles October 01,
2014
11 QC/T 966-2014 Technical specifications for automotive plastic parts coatings October 01,
2014
12 QC/T 459-2014 Truck with loading crane QC/T 459-2004 October 01, 2014 13 QC/T 29106-2014
Technical specification of automobile
wire harness QC/T 29106-2004
October 01,
2014
14 QC/T 198-2014 General technical specification for automotive switch QC/T 198-1995 October 01,
2014
15 QC/T 220-2014 Technical specifications for automotive fusible links QC/T 220-1996 October 01,
2014
16 QC/T 967-2014 Port fuel injector for gasoline engine October 01, 2014 17 QC/T 968-2014
Determination methods of platinum,
palladium and rhodium contents in
metallic catalytic converters
October 01, 2014
18 QC/T 969-2014 Interior truck release for compartment of a passenger car October 01,
2014
19 QC/T 636-2014 Electric window regulator specification for vehicles QC/T 636-2000 October 01,
2014
20 QC/T 970 2014 Passenger car air filter technical specification
October 01,
2014
21 QC/T 971-2014 Specification of air filter element for October 01,
Table of Contents
Foreword ... 7
1 Scope ... 9
2 Normative references ... 9
3 Terms and definitions ... 10
4 Technical requirements ... 10
5 Test methods ... 12
6 Inspection rules ... 14
7 Marks, packaging, transport and storage ... 16
Annex A (Normative) Types and connection sizes of fuel tank cover, fuel filler port ... 18
Annex B (Informative) Schematic diagram of intake valve test device ... 24 Specifications for automobile metal fuel tank
1 Scope
This Standard specifies technical requirements, test methods, inspection rules and marks, packaging, transport, storage for automobile metal fuel tank. This Standard is applicable to metal fuel tanks loaded with vehicle gasoline, vehicle diesel used for M category and N category vehicles (hereinafter referred to as the fuel tank). The metal fuel tanks of vehicle fuels such as alcohol fuel, biofuel, coal-to-liquid can refer to this Standard for implementation. The types and connection sizes of fuel tank cover and fuel filler port used for plastic fuel tank can also refer to this Standard for implementation.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2518, Continuously hot-dip zinc-coated steel sheet and strip
GB/T 3880.1, Wrought aluminum and aluminum alloy plates, sheets and
strips for general engineering - Part 1: Technical conditions of delivery GB/T 3880.2, Wrought aluminum and aluminum alloy plates, sheets and
strips for general engineering - Part 2: Mechanical properties
GB/T 5065, Hot-dip lead-tin alloy coated cold rolled carbon steel sheets and strips
GB/T 15675, Continuously electrolytically zinc/zinc-nickel alloy coated steel sheet and strip
GB 18296, Safety property requirements and test methods for automobile
fuel tank
QC/T 484, Automobile Paint Coating
QC/T 572, Directives for motor vehicle cleanness - Measuring method
be above the fuel level of the fuel loaded in the fuel tank. The opening pressure of intake valve shall satisfy the normal working of the engine that is matched to the fuel tank. The opening pressure of intake valve is determined by the supplier and the purchaser via negotiation.
4.5.2 Test according to 5.4. The fuel tank shall not have permanent suction deformation.
4.6 Fuel tank cover and fuel filler port
4.6.1 See Annex A for the types and connection sizes of fuel tank cover and fuel filler port.
4.6.2 Test according to 5.5.1. After fuel tank cover and fuel filler port are locked, they shall have self-locking function. The loading-unloading shall be easy, labor- saving.
4.6.3 Test according to 5.5.2. The fuel in the fuel filler pipe and at the fuel filler port shall not inject out or overflow.
4.7 Safety performance requirements
4.7.1 The nominal tank capacity of the fuel tank shall not be greater than 95% of the maximum liquid capacity of the fuel tank.
4.7.2 The gas tank of which the nominal tank capacity is over 95L shall be equipped with safety valve device. The safety valve device shall comply with the provisions of 3.1 in GB 18296.
4.7.3 The gas tank that is equipped with fuel evaporative emission system must have an exhaust vent. This exhaust vent shall comply with the provisions of 3.2 in GB 18296.
4.7.4 Sealing of fuel tank
4.7.4.1 Sealing of fuel tank body. Test according to 5.7. Gas leakage is not allowed.
4.7.4.2 Sealing of fuel tank cover. Test according to 5.8. The sealing of fuel tank cover shall comply with the provisions of 3.3 in GB 18296.
4.7.5 Opening pressure of fuel tank’s safety valve
Test according to 5.9. The opening pressure of fuel tank’s safety valve shall comply with the provisions of 3.4 in GB 18296.
4.7.6 Vibration durability of fuel tank
Test according to 5.10. The vibration durability of fuel tank shall comply with the 5.4.1 Composition of test device
U-type water pressure gauge (specification is 0~10000Pa, graduation value is 10Pa), glass rotor flowmeter (accuracy level is 2.5/4.0), electric water pump (pipe booster pump), stand, connecting pipe.
5.4.2 Test method
Put the fuel tank on the test stand. Add nominal tank capacity of water. Shown as Figure B.1, fix the appliance on the test device. Fill a half height of water into the U-type water pressure gauge. Connect and seal other accessories on the fuel tank. Turn on the pump. Adjust the flow to the corresponding value to the maximum fuel supply of the matching engine (in L/h). Continuously pump water for 2h. The water in the U-type water pressure gauge shall not be pumped off. Observe the change of fuel tank and the water column change in the U-type water pressure gauge. When the water column pressure difference is reduced from the maximum value, this maximum pressure difference shall be the
opening pressure of intake valve.
5.5 Test of fuel tank cover and fuel filler port
5.5.1 Loading-unloading test
Load and unload the fuel tank cover with bare hands. Check if it can be loaded and unloaded. Check if there is any loosening.
5.5.2 Fuel filling test
Under the condition that the flow is 50L/min, fill fuel into the fuel tank. Observe if fuel injects out or overflows.
5.6 Maximum liquid capacity test of fuel tank
Place the simulation loading form of fuel tank on the platform. Remove the fuel tank cover. Add water or fuel into the fuel tank till there is water or fuel overflowing. Then measure the volume of water or fuel added. It shall be the maximum liquid capacity of the fuel tank (in L).
5.7 Sealing test of fuel tank body
Place the fuel tank in a clean water tank. Access 30kPa ± 5kPa relative atmospheric pressure into the fuel tank. Immerse the testing parts of tank body into the clean water successively. The depth is not greater than 100mm. Retain the pressure for 1min. Observe if there are bubbles.
5.8 Sealing test of fuel tank cover
Place the simulation loading form of fuel tank on the platform. Add nominal tank 13 Pressure resistance of fuel tank 4.7.7 5.11 - - √ 2 pcs/a
14
Torsional strength
between fuel tank body
and nut
4.7.8 5.12 √ 2 pcs/shift √ 2 pcs/a
6.4 Type inspection
6.4.1 The product for type inspection shall be extracted from the products inspected as accepted by exit-factory inspection. Before type inspection is performed, the extracted sample shall be re-inspected as accepted according to exit-factory inspection items.
6.4.2 In one of following cases, the type inspection shall be carried out for the fuel tank.
- trial model identification for new product or old product produced in transferred plant;
- great changes in major design, technique, material which may affect
product performances of the fuel tank;
- big fluctuation in exit-factory inspection results or great difference from previous type inspection results;
- production resumed after discontinued production of more than one year; - required by national quality supervision organization;
- periodic inspection according to Table 3.
6.5 Rules for determination
6.5.1 If type inspection is passed, this batch of products shall be put in storage or exit factory as accepted products.
6.5.2 If there is rejected item in type inspection, it shall double sampling from the original batch of products for re-inspection. If there is still rejected item, the product shall not exit factory.
7 Marks, packaging, transport and storage
7.1 Marks
The product and packaging shall have marks. The marking content shall include product name, product model, trademark, manufacturer name and address,
exit-factory date, executive standard code. The product shall be accompanied