1、GM DAEWOO Auto & Technology EDSE ngineering,GM DAEWOO Auto & Technology.Standards THE REQUIREMENT OF LOWER PRESSURE LPG HOSES EDS-M-7220 ISSUED DATE: 2003. 07. 03 REVISEDDATE: - VERSION: 1EDS-M-7220 THE REQUIREMENT OF LOWER PRESSURE LPG HOSES PAGE: 1/4 ISSUED DATE: 2003. 07. 03 REVISED DATE : . . VE
2、RSION: 1 GM DAEWOO Auto & Technology 1. PURPOSE This specification specifies the test methods and requirements for lower pressure LPG hoses. 2. SCOPE This specification is applied to lower pressure LPG hoses that connect vaporizer and mixer in automobile that LPG is used for fuel. 3. NOTES Samples o
3、f materials or parts that follow this specification shall be approved by Technical center before mass production & delivery. In the event of any deviation from this specification, it is the sole responsibility of the supplier to inform the purchaser of all such deviations. Furthermore, the supplier
4、shall submit the modified sample for reapproval by Technical center before mass production & delivery. 4. CONSTRUCTION OF HOSES The hose wall shall consist of tube (NBR), reinforcement and cover(CSM), adhering with each other firmly in sequence. 5. TEST PIECE AND ITS QUANTITY The form, size and numb
5、er of test pieces shall be as specified in the relevant EDS test specification. 6. CONDITIONING OF TEST PIECES The conditioning of test pieces shall be carried out according to the relevant EDS test specification. 7. TEST EQUIPMENT The equipment shall conform to the relevant EDS test specification.
6、8. TEST METHOD The method shall conform to the relevant EDS test specification. 9. REQUIREMENTS OF PROPERTIES The tests and evaluations shall be performed according to the relevant EDS test specification. Tube Cover 9.1. Hardness to EDS-T-7403 65 5 60 5 SHORE A or IRHD 9.2. Elongation to EDS-T-7408-
7、S3A 300 300 % min. 9.3. Tensile strength to EDS-T-7408-S3A 10 8 N/ min.EDS-M-7220 THE REQUIREMENT OF LOWER PRESSURE LPG HOSES PAGE: 2/4 ISSUED DATE: 2003. 07. 03 REVISED DATE : . . VERSION: 1 GM DAEWOO Auto & Technology Tube Cover 9.4. Heat resistance to EDS-T-7421-C2 9.4.1. Change of hardness +10 -
8、 SHORE A or IRHD max. 9.4.2. Change of tensile strength -20 +20 - % 9.4.3. Change of Elongation -30 - % min. 9.5. Heat resistance to EDS-T-7421-A2 (place for 72 hours under temperature of 120 ) 9.5.1. Change of hardness - +15 SHORE A or IRHD max. 9.5.2. Change of tensile strength - -20 +20 % 9.5.3.
9、Change of Elongation - -50 % min. 9.6. Oil resistance to EDS-T-7418-C2 Immerse in GMDAT genuine engine oil and then measure the properties. 9.6.1. Change of hardness +15 +10 SHORE A or IRHD max. 9.6.2. Change of tensile strength -20 -20 % min. 9.6.3. Change of Elongation -50 -50 % min. 9.6.4. Change
10、 of v olume -15 +5 -15 +5 % 9.7. Fuel resistance to EDS-T- 7419 : This test is only applied to tube material. Place the test piece under immersing in ASTM fuel “C” according to EDS-T-7419 for 48hours at room temperature, and then measure the properties. 9.7.1. Change of hardness -30 +2 SHORE A or IR
11、HD max. 9.7.2. Change of v olume 0 +50 % Change of v olume after dry 10 % additionally for 48hours under room temperature 9.8. Compression set to EDS-T-7424-C2 : This test is only applied to tube material. Requirement : 40% max. 10. REQUIREMENTS OF HOSES 10.1. Cold flexibility 10.1.1. Procedure Expo
12、se hose sample of 150mm approximately in a straight position for 5 hours in a cold chamber at -40 1KEDS-M-7220 THE REQUIREMENT OF LOWER PRESSURE LPG HOSES PAGE: 3/4 ISSUED DATE: 2003. 07. 03 REVISED DATE : . . VERSION: 1 GM DAEWOO Auto & Technology and bend the hose at a steady rate in a period of 4
13、 seconds 180 around a mandrel having a diameter 8 times the outside diameter of the hose. 10.1.2. Requirement : The hose shall not fracture and shall not show any cracks, in the inner tube or cover. 10.2. Heat resistance (hose) 10.2.1. Procedure Expose hose sample of 150mm approximately in a straigh
14、t position for 300 hours in a cold chamber at 100 3K and bend the hose at a steady rate in a period of 4 seconds 180 around a mandrel having a diameter 8 times the outside diameter of the hose. 10.2.2. Requirement : The hose shall not fracture and shall not show any cracks, in the inner tube or cove
15、r. 10.3. Ozone resistance ( EDS-T-7405-2H2U ) : No cracks 10.4. Leakage and Burst test 10.4.1. Test procedure One end of the hose must be covered tightly not to leak, another end is applied by 1.5 bar of air for 5 minutes. After that, inspect the hose for local constriction, deformation and any defe
16、cts. 10.4.2. Requirement : There must be no leakage, local constriction, and any deformations 10.5. Negative pressure resistance test 10.5.1. Test procedure1 One end of the hose must be covered tightly not to leak, another end is applied by the negative pressure, which is as lower as 150 mm Hg from
17、atmosphere for 5 minutes(i.e.610 mm Hg). After that, inspect the hose for local constriction, deformation and any defects. 10.5.2. Requirement : There must be no constriction and any deformations. 11. AUTOMOTIVE RESTRICTED HAZARDOUS SUBSTANCES Materials and components of parts must comply with EDS-A
18、-0101. 12. CODING SYSTEM This specification shall be indicated in technical drawings and other specifications as follows. “EDS-M-7220“ 13. DEVIATION Deviations from this specification or additional requirement shall be agreed. These shall be indicated in relevant part drawings or specification and r
19、ecorded in test certificates, reports and the like.EDS-M-7220 THE REQUIREMENT OF LOWER PRESSURE LPG HOSES PAGE: 4/4 ISSUED DATE: 2003. 07. 03 REVISED DATE : . . VERSION: 1 GM DAEWOO Auto & Technology 14. RELATED STANDARDS EDS-A-0101 Automotive restricted hazardous substances for parts EDS-T-7403 Det
20、ermination of hardness of elastomeric components EDS-T-7405 Determination of ozone resistance of elastomer EDS-T-7408 Determination of tensile stress-strain properties EDS-T-7418 Resistance of elastomers to liquid and grease EDS-T-7419 Fuel resistance of elastomers EDS-T-7421 Accelerated aging test for elastomers EDS-T-7424 Determination of compression set
