GMW14638Thermoplastic Fuel Tubings Draft D.doc
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1、GM WORLDWIDE ENGINEERING STANDARDSGMW146381 ScopeThis specification covers requirements for extruded single and multilayered lines used in fuel, vapor and evaporative emissions. The vapor and evaporative emission lines covered by this specification can either be straight or convoluted. Operating tem
2、peratures for lines covered by this specification range from 40C to 90C with excursions to 115C. Other documents which describe the performance and dimensional requirements of these components and assemblies manufactured from these components are GME 60223, GM9060P, GM9080P, GM9676P, and Chart #1009
3、3203. In addition to the test requirements listed in this specification, additional fuel recirculation and/or permeation testing may be required for validation of the tubing and/or quick-connectors used in the fuel line assembly. Any additional requirements are to be defined by the GM Materials Engi
4、neer.1.1 Material DescriptionEach material shall be defined by a construction and a grade. The construction identifies the layers utilized in the wall. The grades identifies the conductivity of the line. Grade C identifies a tube that has a conductivity greater than 106 Ohms/sq . Grade N identifies
5、a tube which has less than 106 Ohms/sq . Each version shall consist of a smooth bore inner tube. All multilayer constructions shall have concentric layers. Many Grade N applications can also be supplied as corrugated or convoluted tubing and shall be identified with an alternate specification.1.1.1
6、Construction (See Appendix A1) 1.1.1.1 Type A Grade N only: This tube shall consist of a single layer of either Polyamide 12 (PA12) or Polyamide 11 (PA11).1.1.1.2 Type B This tube is a laminated construction with an inner tube of ETFE (Ethylene-Tetrafluoroethylene Copolymer) and a cover of PA12. Gra
7、de C consists of an inner tube of conductive ETFE and an outer tube of nonconductive ETFE tube. The cover shall consist of PA12. The cover shall be 70 to 80% of the total wall thickness and the minimum thickness of the conductive ETFE layer shall be 0.05 mm.Grade N consists of a single inner tube of
8、 nonconductive ETFE. The cover shall consist of PA12. The cover shall be 70 to 80% of the total wall thickness and the minimum thickness of the conductive ETFE layer shall be 0.05 mm.1.1.1.3 Type CGrade N only This tube is a laminated construction with an inner tube of PA12, a barrier layer of PBT a
9、nd a cover of PA12. The PBT barrier layer shall have a thickness of 0.25 0.05 mm.1.1.1.4 Type D This tube is a laminated construction with an inner tube PA12, a barrier layer of PVDF and a cover of PA12. Grade C shall consist of an inner layer of conductive PA12 with a nominal thickness of 0.1 0.02m
10、m, and an intermediate layer of nonconductive PA12. The barrier layer shall be PVDF and have a nominal thickness of 0.2 0.05mm and will be located in the center of the tubing wall. The cover will be nonconductive PA12.Grade N shall consist of an inner layer of nonconductive PA12. The barrier layer s
11、hall be PVDF and have a nominal thickness of 0.2 0.05mm and will be located in the center of the tubing wall. The cover will be nonconductive PA12.1.1.1.5 Type E This type construction shall be specified on the drawing and can be identified as either Grade C or N.1.1.1.6 Type F The tube is an inner
12、tube of Polytetrafluoroethylene (PTFE) and a cover of PA12. Grade C shall consist of an inner barrier layer of conductive PTFE with a minimum thickness of 0.076mm. The intermediate layer shall be nonconductive PTFE. The total barrier layer thickness for both grades shall be 0.38 0.05mm. The outer la
13、yer shall be PA12. The outer layer shall be 55 to 75% of the wall thickness.Grade N shall consist of an inner layer of PTFE. The total barrier layer thickness for both grades shall be 0.381 0.050mm. The outer layer shall be PA12. The outer layer shall be 55 to 75% of the wall thickness.1.1.1.7 Type
14、G EVOHGrade N only This tube is a laminated construction with an inner tube of PA12, a barrier layer of EVOH and a cover of PA12. The EVOH barrier layer shall have a thickness of 0.15 0.03 mm.1.1.1.8 Type H The tube is a laminated construction with an inner tube of conductive ETFE (Ethylene-Tetraflu
15、oroethylene Copolymer) an intermediate layer of adhesive and a cover of PA12.Grade C shall consist of a conductive ETFE with a thickness of 0.200 0.076mm. The intermediate layer of adhesive shall have a thickness of 0.10 0.05mm. The cover shall consist of PA12 with a thickness of 0.70 0.13mm. The co
16、ver shall be 70 to 90% of the wall thickness.Grade N shall consist of a nonconductive ETFE with a thickness of 0.200 0.076mm. The intermediate layer of adhesive shall have a thickness of 0.10 0.05mm. The cover shall consist of PA12 with a thickness of 0.70 0.13mm. The cover shall be 70 to 90% of the
17、 wall thickness.1.1.1.9 Type I This tube is a laminated construction with an inner tube of EFEP (ethylene-perfluoroethylenepropylene copolymer) and a cover of PA12.Grade C shall consist of a conductive EFEP with a thickness of 0.200 0.050mm. The cover shall consist of PA12 with a thickness of 0.80 0
18、.05mm.Grade N shall consist of a nonconductive EFEP with a thickness of (0.200 0.050) mm. The cover shall consist of PA12 with a thickness of 0.80 0.05 mm1.2 Labeling Tubing released to this specification must be labeling based on the requirements of the region which it is released. Tubing for GMNA
19、must be labeled per Appendix A5. Tubing for GME must be labeled per DIN 73 378. Labeling requirements for other regions shall be coordinated with the regional Materials Engineer.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Spec
20、ificationsDIN 73378EN 60243-2IEC 60093IEC 60684-2ISO 178ISO 527SAE J1681SAE J2260SAE J17372.2 GM Standards/SpecificationsGME 60223GME 60255GME L0003GM9005PGM9060PGM9080PGM9676PGMW3001GMW3059GMW147009984297998612199862313 RequirementsMinimum bend diameter referenced in specific test procedures shall
21、be calculated per SAE J2260. A quick table reference has been provided in Appendix A2.Requirements Reference TableSectionTest#Samples3.1Burst 53.2High Temperature Burst 53.3Reference StressN/A3.4Cold Temperature Flexibility53.5Surface Resistivity53.6Disruptive Discharge53.7Cold Impact53.8Kink Resist
22、ance53.9Burst on Kinked Tube53.10Resistance to Stone Impact53.11Layer Adhesion 53.12Tensile53.13Elongation53.14Flexural Test53.15Zinc Chloride53.16Calcium Chloride53.17Fuel Resistance Recirculation5/Each Fuel3.18Auto-oxidized Fuel Resistance53.19Permeability 53.20Resistance to Brake Fluid53.21Resist
23、ance to Underbody Protective Wax53.22Resistance to Oil53.1 Burst Test3.1.1 Test Procedure The test apparatus consists of a suitable source of hydraulic pressure and the necessary gages and piping. The length of the tubing should be 305.0 5.0mm. Plug one end of the test specimen and mount in the appa
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