1、WORLDWIDEENGINEERINGSTANDARDSGeneral Specification GMW14587Thermoplastic Tubing for Hot Diesel Fuel Lines Copyright 2012 General Motors Company All Rights ReservedSeptember 2012 Originating Department: GME Specification Center Page 1 of 81 IntroductionNote: Nothing in this standard supercedes applic
2、able laws and regulations.Note: In the event of conflict between the English and domestic language, the English language shall takeprecedence.1.1 Scope. This standard covers the requirements for thermoplastic tubing supplied to finished dimensionsand sizes in accordance with the relevant engineering
3、 drawing used exclusively for the lines of the diesel fuelsystem.This specification shall not be used for lines of the gasoline fuel system.Direct contact between the fuel pipes and materials containing chlorine, as for example adhesive tapes madeof polyvinyl chloride (PVC) is not allowed, because n
4、ascent chlorine resulting from high temperaturedecomposition may cause cracks in the polyamide 12 (PA12) outer layer.The operating temperature range of the tubing is (-40 to +125) C with peak temperatures up to +140 C.1.2 Mission/Theme. Not applicable.1.3 Classification.1.3.1 Application. Correspond
5、ing to the application conditions, the following two types are covered:1.3.1.1 Type A: Flexible hot diesel fuel line.1.3.1.2 Type B: Rigid hot diesel fuel line.1.3.2 Tubing Diameter. The following tubing diameter sizes are applicable.Table 1: DimensionsCode Tubing Diameter8 (8 0.1) mm (1 0.1) mm10 (
6、10 0.1) mm (1 0.1) mm12 (12 0.15) mm (1 0.1) mm2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.DIN 53758 EN 60243-2 ISO 527-1 ISO 1817DIN 73378 IEC 60684-2 ISO 527-2 ISO 1874-1EN 590 ISO 178 ISO 1043-1 ISO 16152EN 1
7、4214 ISO 179-1 ISO 1133 SAE J22602.2 GM Standards/Specifications.GMW3059 GMW14700 GMW15827 GMW16331GMW3356 GMW14914 GMW16177GMW14681 GMW15416 GMW16181Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted withou
8、t license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14587 Copyright 2012 General Motors Company All Rights ReservedSeptember 2012 Page 2 of 83 Test Preparation and Evaluation3.1 Resources.3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a va
9、lidcalibration label.3.1.2 Alternatives. Alternative test facilities and equipment may also be used. However, all measuringvariables as specified in this standard shall be determined correctly with respect to their physical definition.3.1.3 Facilities. According to the relevant test method.3.1.4 Equ
10、ipment. According to the relevant test method.3.1.5 Test Vehicle/Test Piece. If not otherwise stated, the size, dimensions and number of test pieces shall beas specified in the relevant test methods for the property concerned.For the tests in paragraphs 4.3.11 thru 4.3.13, the mechanical specified v
11、alue of yield stress (seeparagraph 4.3.1) and strain at break (see paragraph 4.3.2) shall be used as reference.3.1.6 Test Time. Not applicable.3.1.7 Test Required Information. Not applicable.3.1.8 Personnel/Skills. Not applicable.3.2 Preparation. Not applicable.3.3 Conditions.3.3.1 Environmental Con
12、ditions. Unless otherwise specified in the relevant tests, tests shall be performed inthe as-received condition after storage at (+23 5) C and (50 6) % relative humidity for 48 h without anypre-conditioning.3.3.2 Test Conditions. Deviations from the requirements of this standard shall have been agre
13、ed upon. Suchrequirements shall be specified on component drawings, test certificates, reports, etc.3.4 Instructions. Not applicable.3.5 Data. Not applicable.3.6 Safety. This standard may involve hazardous materials, operations, and equipment. This standard doesnot propose to address all the safety
14、problems associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.3.7 Documentation. Samples of components or material released to this standard shall be te
15、sted forconformity with the requirements of this standard and approved by the responsible GM Department prior to thestart of delivery of production level components or materials.Any change to the component or material, e.g., design, function, properties, manufacturing process and/orlocation of manuf
16、acture requires a new release of the product. It is the sole responsibility of the supplier toprovide the customer, unsolicited, with documentation of any change or modification to the product/process,and to apply for a new release.If not otherwise agreed to, the entire verification test shall be re
17、peated and documented by the supplier prior tostart of delivery of the modified or changed product. In some cases, a shorter test can be agreed to betweenthe responsible GM department and the supplier.3.7.1 Test Results. The results of the tests shall be summarized in a test report.4 Requirements an
18、d ProcedureNote: All requirements shall be met by any part of the tubing. Each measurement shall meet the requiredvalue. All requirements shall be met by the moulded part.4.1 General.4.1.1 Material. The extruded tubing shall be made of one material. This material shall be a PA12 with anadditional, p
19、articularly effective stabilization to avoid the degradation of the material in hot diesel fuel and in hotair. The material shall also be resistant against ultraviolet (UV) radiation.x Type A: PA12-HIPHL Type 1 according to DIN 73378 specially stabilized for hot diesel applications.Copyright General
20、 Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14587 Copyright 2012 General Motors Company All Rights ReservedSeptember 2012 Page 3 of 8x Type B: PA12 sp
21、ecially stabilized for hot diesel applications.4.1.2 Appearance. In the as received condition the tubes shall be free from manufacturing faults (e.g., blisters,voids, in homogeneities, foreign substances).4.1.3 Dimensions. Dimensions as specified on the part drawing.If not otherwise specified on the
22、 part drawing, the tolerance for diameter and for the wall thickness shall beaccording to paragraph 1.3.2.4.1.4 Color. The coloration of the outer layer of the tubing shall be permanently uniform. If not otherwisespecified on the part drawing, the color of the outer layer of the tubing shall be blac
23、k or brown.4.1.5 Ultraviolet Stabilization. A sufficient stability against exposure to sunlight (UV radiation) is required.4.1.6 Operating Characteristics. The continuous temperature range for the use is (-40 to +125) C with peaktemperatures up to +140 C. The peak temperatures can make up to 100 h i
24、n the lifetime of the vehicle.4.1.7 Part Identification. The tubing shall be marked according to GMW16331.4.2 Characteristics. The characteristic properties of the tubing shall be as specified in Table 2. The requiredtest procedures are specified in 4.3.Table 2: Physical PropertiesPropertyTypeUnit P
25、aragraph/TestA B8 10 12 8 10 12Yield Stress 25 34 MPa 4.3.1 / ISO 527-1,ISO 527-2Strain at Break 150 % 4.3.2 / ISO 527-1,ISO 527-2Reference Stress4.3.3 / DIN 73378at (+23 5) C 24 40 MPaat (+140 3) C 6 8 MPaImpact Behavior no break J 4.3.4 / DIN 73378ISO 179-1Burst Pressure4.3.5 / DIN 53758at (+23 5)
26、 C 60 47 38 100 78 64 barat (+140 3) C 15 12 10 20 16 13 barFlexural Test4.3.6 / ISO 178Maximum FlexuralForce Fmax 35 50 70 85 103 135 NDeflection at Fmax 12 8 8 6 5 4 mmFlexural Force F at3.5 mm Deflection 17 30 43 55 80 110 NMinimum BendRadius Note 1 35 57 68 40 60 93 mm 4.3.7 / SAE J2260Melt Volu
27、me-Flow Rate4.3.8 / ISO 1133MVR 250/10 in asreceived condition 25 15cm3/10 minutesMVR 250/10 afterageing 0.5cm3/10 minutesExtractables 12 to 14 3 % by mass 4.3.9 / ISO 16152Change of Length4.3.10after 5 d -3 to 0 -0.6 to +0.6 %after 21 d -4 to 0 -0.6 to +0.6 %Resistance to Brake Fluid4.3.11 / ISO 18
28、17Change of YieldStress -10 to +10 %Change of Strain at -20 to +20 %Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14587 Copyright 2012
29、General Motors Company All Rights ReservedSeptember 2012 Page 4 of 8PropertyTypeUnit Paragraph/TestA B8 10 12 8 10 12BreakResistance to Underbody Protective Wax4.3.12 / ISO 1817Change of YieldStress -10 to +10 %Change of Strain atBreak -20 to +20 %Resistance to Oil4.3.13 / ISO 1817Change of YieldStr
30、ess -10 to +10 %Change of Strain atBreak -20 to +20 %Resistance to StoneImpactSlight indentation marks caused by impact permissible.No whitening, cracks, or objectionable defects allowed.4.3.14 /GMW14700Temperature CycleTestNo changes of surface, geometry, color or otherchanges restrictive to servic
31、eability.No cracks.4.3.15Thermal Shock Test No change of surface, of geometry, no cracks, nobreak or other changes restrictive to serviceability. 4.3.16Flow Ageing Note 2 4.3.17during and aftertesting No leakage, no break - especially at theconnections.4.3.17.1Leakage 4.3.17.2 /GMW14681Impact Behavi
32、or no break J4.3.17.3 /DIN 73378ISO 179-1Burst Pressure 110 N/A N/A 110 N/A N/A bar 4.3.17.4 /DIN 53758Disruptive DischargeVoltage 40 kV4.3.18 /EN 60243-2IEC 60684-2Note 1: Test of tubing: This is only a test dimension and not a construction dimension.Note 2: This is a material test. The test is exe
33、cuted representative with 8 mm tubing only.4.3 Test Procedures.4.3.1 Yield Stress. To ISO 527-1 and ISO 527-2.4.3.1.1 Test Pieces: Length 150 mm, clamping length: 100 mm, speed = 100 mm/minute.4.3.1.2 The test piece shall be mounted using a mandrel ( = nominal inside diameter + 0.5 mm) and clampings
34、hoes on the outside.4.3.1.3 Test is performed in longitudinal direction.4.3.2 Strain at Break. To ISO 527-1 and ISO 527-2.4.3.2.1 Test Conditions. See paragraph 4.3.1. Original gauge length for determining the extension 50 mm.4.3.3 Reference Stress. To DIN 73378.4.3.4 Impact Behavior. To DIN 73378 w
35、ith reference to ISO 179-1. The test is executed at followingconditions:4.3.4.1 At (-40 3) C.4.3.4.2 After (70 2) h at (+150 3) C, tested after cooling to (+23 5) C.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking p
36、ermitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14587 Copyright 2012 General Motors Company All Rights ReservedSeptember 2012 Page 5 of 84.3.4.3 After testing the change of length to paragraph 4.3.10, test immediately after fuel discharging at(-40 3) C.4.3.5 Burst Pressur
37、e. To DIN 53758.x Test at (+23 5) C.x Test at (+140 3) C.4.3.6 Flexural Test. Three (3) Point Flexural Test to ISO 178.4.3.6.1 Test Piece; 120 mm long.4.3.6.2 Support distance; 80 mm, radius of support:x r2 = (2 0.2) mm.4.3.6.3 Test Speed: v = 5 mm/minute, preload: Fv = 0.5 N, test at (+23 5) C and
38、(50 6) % relativehumidity.4.3.6.4 A diagram-force (in N) to deflection (in mm) is recorded during the test. The following values areidentified in the diagram:x Maximum Flexural Force Fmaxx Deflection at Fmaxx Flexural Force F at 3.5 mm DeflectionNote to the documented values:x The stronger the defle
39、ction at Fmax, the stronger the kink resistance of the tubing.x The stronger the flexural force F at 3.5 mm deflection, the stronger the flexural stiffness of the tubing.4.3.7 Minimum Bend Radius. To SAE J2260. This is a test of the tubing. The dimension is a test dimensionand not a construction dim
40、ension.4.3.8 Melt Volume-Flow Rate. To ISO 1133.4.3.8.1 Test pieces are taken from the tubing to be tested.4.3.8.2 Perform one (1) measurement on each sample, conditioned as follows:4.3.8.3 In the as received condition (after pre-conditioning of test pieces according to paragraph 3.3.1.4.3.8.4 After
41、 ageing, storage in heat chamber at (+150 3) C for (72 2) h.4.3.9 Extractables. To ISO 16152. Test pieces are taken from the tubing to be tested.4.3.10 Change of Length. A tubing section 500 mm in length is used for the test.4.3.10.1 Preparation: The tubings are tempered for 15 minutes at (+155 3) C
42、 and the reference length isdetermined.4.3.10.2 The tubing section shall be connected to a fuel storage tank (see Figure 1), the other end shall besealed with a blanking plug. The entire system shall then be filled with Global Diesel Test Fuel perGMW14914. The tubing should be sealed (or closed) in
43、the way that no pressure is in the system (tubing)afterwards. Conditioned at (+100 3) C suspended in air.4.3.10.3 Test Period: Five (5) days and 21 days. (5 d/21 d).4.3.10.4 After completion of the test period (5 d or 21 d), the tubings are removed from the heat chamber andstored for 1 h at (+23 5)
44、C and (50 6) % relative humidity. Their lengths are then measured.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14587 Copyright 2012 Ge
45、neral Motors Company All Rights ReservedSeptember 2012 Page 6 of 8Figure 1: Fuel Storage Tank - Change of Length Test1. ball lock valve2. brazed3. volume: 100 cm34. blanking plug4.3.11 Resistance to Brake Fluid. To ISO 1817 in brake fluid GMW3356 for (72 /-2) hat (+23 5) C.x Test of yield stress (pa
46、ragraph 4.3.1) and strain at break (paragraph 4.3.2): 1 h after sampling.x Test piece: Length of tubing 200 mm sealed (only external contact).4.3.12 Resistance to Underbody Protective Wax. To ISO 1817 in underbody protective wax per GMW15416for (72 /-2) h at (+23 5) C.x Test of yield stress (paragra
47、ph 4.3.1) and strain at break (paragraph 4.3.2): (24 1) h after sampling.x Test piece: length of tubing 200 mm sealed (only external contact).4.3.13 Resistance to Oil. To ISO 1817 in engine oil per GMW15827 opt. GMW16177 opt. GMW16181 for(72 /-2) h at (+100 3) C.x Test of yield stress (paragraph 4.3
48、.1) and strain at break (paragraph 4.3.2): 10 minutes after sampling.x Test piece: length of tubing 200 mm sealed (only external contact).4.3.14 Resistance to Stone Impact. To GMW14700.x Test temperature: (-40 3) C.x Criteria: Slight indentation marks caused by impact permissible. No whitening, cracks, or objectionabledefects allowed.x Test piece: Ten (10) tubing sections of 100 mm length placed side by side on a test panel.4.3.15 Temperature Cycle Test. A 200 mm lo
