QC/T 798-2025 (QC/T 798-2008) PDF English
US$150.00 · In stock · Download in 9 secondsQC/T 798-2008: Multilayers plastic tubing for automotive fuel system Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid QC/T 798: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| QC/T 798-2025 | English | 439 |
Add to Cart
|
4 days
|
Multi-layers plastic tubing for automotive fuel system
| Valid |
| QC/T 798-2008 | English | 150 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Multilayers plastic tubing for automotive fuel system
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: QC/T 798-2008
QC/T 798-2008: Multilayers plastic tubing for automotive fuel system---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT798-2008
AUTOMOBILE INDUSTRY STANDARD
Multilayers plastic tubing for automotive fuel system
Issued on. FEBRUARY 01, 2008
Implemented on. JULY 01, 2008
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Specification dimension... 7
5 General requirements... 8
6 Performance requirements... 9
7 Test methods... 10
8 Inspection rules... 20
9 Markings and signs... 21
10 Packaging, transportation, storage... 22
Appendix A (Normative) Specifications for permeability resistance test... 23
Foreword
This standard was formulated with reference to SAE J 2260 “Nonmetallic fuel
system tubing with one or more layers”. It mainly refers to the technical content
of multilayer tubes. This standard also refers to foreign advanced standards
and the production and use of multilayer tubes for fuels in China.
Appendix A of this standard is a normative appendix.
This standard was proposed by the National Automotive Standardization
Technical Committee.
This standard shall be under the jurisdiction of the National Automotive
Standardization Technical Committee.
Drafting organizations of this standard. Hebei Yada Automotive Plastics Co.,
Ltd., China First Automobile Group Corporation Technology Center.
The main drafters of this standard. Yang Quanliang, Wang Qingguo, Liu Wei,
Wang Shengxian, Wang Zhiwei.
Multilayers plastic tubing for automotive fuel system
1 Scope
This standard specifies the dimensional specifications, appearance, technical
requirements, test methods, inspection rules, markings, packaging,
transportation, storage of multilayer plastic tubing for automotive fuel systems
(hereinafter referred to as multilayer tubing) and tube assemblies.
This standard is applicable to multilayer plastic fuel tubes which have a working
temperature between -40 °C and +115 °C (continuous use temperature shall
not exceed 90 °C) and maximum working pressure of not more than 0.7 MPa.
2 Normative references
The provisions in following documents become the provisions of this standard
through reference in this standard. For the dated references, the subsequent
amendments (excluding corrections) 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 528-1998 Determination of tensile stress-strain properties of
vulcanized rubber or thermoplastic rubber
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Multilayer plastic tubing
More than two layers of non-metallic plastic tubes which are made of
materials of different properties and different types, without connectors.
4 Specification dimension
4.1 Structure
The multilayer tube is a multilayer structure which contains the wall-thickness
of the main body. The name of material is generally indicated on the drawing. If
specified, it shall identify each layer of all tube layers.
4.3 Wall-thickness
Multilayer tubes of different sizes which are made by materials of different
grades have different wall-thicknesses. The minimum wall-thickness of a
straight tube which has a nominal diameter equal to 10 mm is 0.9 mm. The
larger the nominal diameter, the larger the wall-thickness. The requirements for
wall-thickness are as detailed in Table 1.
5 General requirements
5.1 Color and appearance
5.1.1 Color. The color of the outermost surface of the multilayer tube is
generally black. The choice of other colors may be determined by the
manufacturer and the user through negotiation. The color of the multilayer tube
shall be continuous and uniform.
5.2 Materials
The material used for the multilayer tube is nylon and other materials. The
different requirements of the material depend on the layered structure of the
tube’s wall. The material may contain plasticizers, colorants, impact modifiers,
other additives to enhance the performance, to meet the performance
requirements of multilayer tubes as specified in this standard.
6 Performance requirements
The performance requirements of the multilayer and/or multilayer tube
assembly shall comply with the requirements of Table 2.
7 Test methods
7.1 Test conditions
Unless otherwise specified, the multilayer tube shall be sampled at least 24
hours after production. Before the test, it shall, according to the requirements
of GB/T 2918-1998, place the specimen at standard environment state which
has a temperature of 23 °C ± 2 °C and a humidity of 50% ± 10% to condition it
for at least 24 h.
7.3 Burst-pressure at room-temperature
7.3.1 Specimen. Five tube assemblies which have a length of 300 mm between
the tubes.
7.3.2 Test device. Blast pressure testing machine.
7.4 Burst-pressure at high-temperature
7.4.1 Specimen. Five tube assemblies which have a length of 300 mm between
the tubes.
7.4.2 Test device. Burst-pressure testing machine.
7.4.3 Test procedure.
7.5 Bending performance
7.5.1 Determination of the minimum bending radius.
7.5.1.1 Calculation of the minimum bending radius. Table 3 gives the empirical
formula for the minimum bending radius of the multilayer tube.
7.5.1.2 Determination of the minimum bending radius. Use the minimum
bending radius given in Table 3 as the outer diameter of the mandrel. Bend the
multilayer tube over the mandrel to form a coil. Fix the free end. The first loop
of the multilayer tube forms a coil of two layers of the multilayer tube.
7.6 Resistance to zinc chloride
7.6.1 Specimens. Five multilayer tubes of length (1.2 × π) × minimum bending
radius.
7.6.2 Test procedure.
7.6.2.2 Install the multilayer tube on the tube fittings. Follow the requirements
of 7.3 to carry out the burst pressure test.
7.7 Impact performance at low-temperature
7.7.1 Specimen. Five straight tubes which have a minimum length of 200 mm.
7.7.3 Test procedure.
7.7.3.1 Place the specimen in a -40 °C low-temperature chamber for 4 h. During
the test, place the multilayer tube on the support platform of the impact device
as shown in Figure 4, to allow the impact head to fall freely. The impact test
shall be completed within 5 s at 23 °C ± 2 °C after the specimen is removed
from the low-temperature chamber.
After the impact is completed, check whether multilayer tube has cracks.
7.10.2.3 Follow the requirements of 7.9.1 to carry out the test of yield
stress/elongation at break in extrusion direction.
7.10.2.4 Follow the procedures of 7.11.2 to carry out the inter-layer cohesion
test.
7.11 Inter-layer adhesion test
7.11.1 Initial layer adhesion test.
8 Inspection rules
8.1 Qualification documents and markings
Products shall pass the inspection of the manufacturer and be accompanied by
a product certificate before exit-factory.
8.2 Category of inspection
The inspection is divided into exit-factory inspection and type inspection.
8.3 Exit-factory inspection
8.4 Type inspection
8.4.1 Several situations in which type inspection shall be carried out.
In one of the following cases, the manufacturer shall carry out a type inspection.
8.4.2 Sampling.
The multilayer tubes of the same specification which are continuously produced
at the same production site, by the same raw material, equipment and process
are considered as a batch.
8.4.3 The items of type inspection are all items as specified in clauses 5 and 6.
8.5 Determination of qualification
Use the test method as specified in this standard to carry out inspection. Based
on the test results and technical requirements, make quality determination
against the product.
9 Markings and signs
9.1 Markings on multilayer tube
The markings on the multilayer tube shall be clear and firm, which shall not
impair the performance of the multilayer tube and the function of the connecting
elements. The spacing between markings shall not exceed 300 mm. The
information of the marking on the multilayer tube shall have at least the following.
9.2 Example
QC/T 798 8 x 1 > PA6/EVOH/ PA12 < Company’s name or trademark 2006-04-
22 Others
QC/T 798-2008
AUTOMOBILE INDUSTRY STANDARD
Multilayers plastic tubing for automotive fuel system
Issued on. FEBRUARY 01, 2008
Implemented on. JULY 01, 2008
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Specification dimension... 7
5 General requirements... 8
6 Performance requirements... 9
7 Test methods... 10
8 Inspection rules... 20
9 Markings and signs... 21
10 Packaging, transportation, storage... 22
Appendix A (Normative) Specifications for permeability resistance test... 23
Foreword
This standard was formulated with reference to SAE J 2260 “Nonmetallic fuel
system tubing with one or more layers”. It mainly refers to the technical content
of multilayer tubes. This standard also refers to foreign advanced standards
and the production and use of multilayer tubes for fuels in China.
Appendix A of this standard is a normative appendix.
This standard was proposed by the National Automotive Standardization
Technical Committee.
This standard shall be under the jurisdiction of the National Automotive
Standardization Technical Committee.
Drafting organizations of this standard. Hebei Yada Automotive Plastics Co.,
Ltd., China First Automobile Group Corporation Technology Center.
The main drafters of this standard. Yang Quanliang, Wang Qingguo, Liu Wei,
Wang Shengxian, Wang Zhiwei.
Multilayers plastic tubing for automotive fuel system
1 Scope
This standard specifies the dimensional specifications, appearance, technical
requirements, test methods, inspection rules, markings, packaging,
transportation, storage of multilayer plastic tubing for automotive fuel systems
(hereinafter referred to as multilayer tubing) and tube assemblies.
This standard is applicable to multilayer plastic fuel tubes which have a working
temperature between -40 °C and +115 °C (continuous use temperature shall
not exceed 90 °C) and maximum working pressure of not more than 0.7 MPa.
2 Normative references
The provisions in following documents become the provisions of this standard
through reference in this standard. For the dated references, the subsequent
amendments (excluding corrections) 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 528-1998 Determination of tensile stress-strain properties of
vulcanized rubber or thermoplastic rubber
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Multilayer plastic tubing
More than two layers of non-metallic plastic tubes which are made of
materials of different properties and different types, without connectors.
4 Specification dimension
4.1 Structure
The multilayer tube is a multilayer structure which contains the wall-thickness
of the main body. The name of material is generally indicated on the drawing. If
specified, it shall identify each layer of all tube layers.
4.3 Wall-thickness
Multilayer tubes of different sizes which are made by materials of different
grades have different wall-thicknesses. The minimum wall-thickness of a
straight tube which has a nominal diameter equal to 10 mm is 0.9 mm. The
larger the nominal diameter, the larger the wall-thickness. The requirements for
wall-thickness are as detailed in Table 1.
5 General requirements
5.1 Color and appearance
5.1.1 Color. The color of the outermost surface of the multilayer tube is
generally black. The choice of other colors may be determined by the
manufacturer and the user through negotiation. The color of the multilayer tube
shall be continuous and uniform.
5.2 Materials
The material used for the multilayer tube is nylon and other materials. The
different requirements of the material depend on the layered structure of the
tube’s wall. The material may contain plasticizers, colorants, impact modifiers,
other additives to enhance the performance, to meet the performance
requirements of multilayer tubes as specified in this standard.
6 Performance requirements
The performance requirements of the multilayer and/or multilayer tube
assembly shall comply with the requirements of Table 2.
7 Test methods
7.1 Test conditions
Unless otherwise specified, the multilayer tube shall be sampled at least 24
hours after production. Before the test, it shall, according to the requirements
of GB/T 2918-1998, place the specimen at standard environment state which
has a temperature of 23 °C ± 2 °C and a humidity of 50% ± 10% to condition it
for at least 24 h.
7.3 Burst-pressure at room-temperature
7.3.1 Specimen. Five tube assemblies which have a length of 300 mm between
the tubes.
7.3.2 Test device. Blast pressure testing machine.
7.4 Burst-pressure at high-temperature
7.4.1 Specimen. Five tube assemblies which have a length of 300 mm between
the tubes.
7.4.2 Test device. Burst-pressure testing machine.
7.4.3 Test procedure.
7.5 Bending performance
7.5.1 Determination of the minimum bending radius.
7.5.1.1 Calculation of the minimum bending radius. Table 3 gives the empirical
formula for the minimum bending radius of the multilayer tube.
7.5.1.2 Determination of the minimum bending radius. Use the minimum
bending radius given in Table 3 as the outer diameter of the mandrel. Bend the
multilayer tube over the mandrel to form a coil. Fix the free end. The first loop
of the multilayer tube forms a coil of two layers of the multilayer tube.
7.6 Resistance to zinc chloride
7.6.1 Specimens. Five multilayer tubes of length (1.2 × π) × minimum bending
radius.
7.6.2 Test procedure.
7.6.2.2 Install the multilayer tube on the tube fittings. Follow the requirements
of 7.3 to carry out the burst pressure test.
7.7 Impact performance at low-temperature
7.7.1 Specimen. Five straight tubes which have a minimum length of 200 mm.
7.7.3 Test procedure.
7.7.3.1 Place the specimen in a -40 °C low-temperature chamber for 4 h. During
the test, place the multilayer tube on the support platform of the impact device
as shown in Figure 4, to allow the impact head to fall freely. The impact test
shall be completed within 5 s at 23 °C ± 2 °C after the specimen is removed
from the low-temperature chamber.
After the impact is completed, check whether multilayer tube has cracks.
7.10.2.3 Follow the requirements of 7.9.1 to carry out the test of yield
stress/elongation at break in extrusion direction.
7.10.2.4 Follow the procedures of 7.11.2 to carry out the inter-layer cohesion
test.
7.11 Inter-layer adhesion test
7.11.1 Initial layer adhesion test.
8 Inspection rules
8.1 Qualification documents and markings
Products shall pass the inspection of the manufacturer and be accompanied by
a product certificate before exit-factory.
8.2 Category of inspection
The inspection is divided into exit-factory inspection and type inspection.
8.3 Exit-factory inspection
8.4 Type inspection
8.4.1 Several situations in which type inspection shall be carried out.
In one of the following cases, the manufacturer shall carry out a type inspection.
8.4.2 Sampling.
The multilayer tubes of the same specification which are continuously produced
at the same production site, by the same raw material, equipment and process
are considered as a batch.
8.4.3 The items of type inspection are all items as specified in clauses 5 and 6.
8.5 Determination of qualification
Use the test method as specified in this standard to carry out inspection. Based
on the test results and technical requirements, make quality determination
against the product.
9 Markings and signs
9.1 Markings on multilayer tube
The markings on the multilayer tube shall be clear and firm, which shall not
impair the performance of the multilayer tube and the function of the connecting
elements. The spacing between markings shall not exceed 300 mm. The
information of the marking on the multilayer tube shall have at least the following.
9.2 Example
QC/T 798 8 x 1 > PA6/EVOH/ PA12 < Company’s name or trademark 2006-04-
22 Others
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
|