GB/T 24141.2-2022 English PDFUS$494.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 24141.2-2022: Rubber hoses and tubing for fuel circuits for internal combustion engines - Specification - Part 2: Gasoline fuels Status: Valid GB/T 24141.2: Historical versions
Basic dataStandard ID: GB/T 24141.2-2022 (GB/T24141.2-2022)Description (Translated English): Rubber hoses and tubing for fuel circuits for internal combustion engines - Specification - Part 2: Gasoline fuels Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G42 Word Count Estimation: 25,213 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 24141.2-2022: Rubber hoses and tubing for fuel circuits for internal combustion engines - Specification - Part 2: Gasoline fuels---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Rubber hoses and tubing for fuel circuits for internal combustion engines - Specification - Part 2.Gasoline fuels ICS 27.020; 83.140.40 CCSG42 National Standards of People's Republic of China Replacing GB/T 24141.2-2009 Rubber hoses and pure rubber hoses for internal combustion engine fuel lines Specification Part 2.Gasoline Fuel Specification-Part 2.Gasolinefuels (ISO 19013-2.2016, IDT) Published on 2022-03-09 2022-10-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Rubber hoses and pure rubber hoses for internal combustion engine fuel lines Specification Part 2.Gasoline Fuel Warning. Persons using this document should have practical experience in formal laboratory work. This document does not address all possible security issues, It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the conditions stipulated by relevant national regulations. 1 ScopeThis document specifies the requirements for rubber hoses and pure rubber hoses used in gasoline fuel lines for internal combustion engines. The applicable gasoline fuels include Fuels with oxidizing substances such as methanol and methyl tert-butyl ether and fuels that have been oxidized (acid gases). In addition, this document can be used as a class method, which should be used to enable original equipment manufacturers (OEMs) to select certain applications for which some tests are not covered by the main types specified. Tests to be "marked" (see example in Appendix G). In this case, rubber hoses and pure rubber hoses should not be accompanied by any indication GB/T 24141 marks in this document, but can record in detail the OEM's own identification marks displayed on its component drawings.2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. Note. GB/T 3512-2014 Vulcanized rubber or thermoplastic rubber hot air accelerated aging and heat resistance test (ISO 188.2011, IDT) assemblies-Hydrostatic testing) Note. GB/T 5563-2013 Hydrostatic test method for rubber and plastic hoses and hose assemblies (ISO 1402.2009, IDT) ISO 1629 Rubbersandlatices-Nomenclature Note. GB/T 5576-1997 Rubber and latex nomenclature (idtISO 1629.1995) Note. GB/T 1690-2010 Test method for liquid resistance of vulcanized or thermoplastic rubber (ISO 1817.2005, MOD) Note. GB/T 3672.1-2002 Tolerances for Rubber Products Part 1.Dimensional Tolerances (idtISO 3302-1.1996) ISO 4671 Rubber and plastic hoses and hose assemblies Method of measurement of hose dimensions and hose assembly lengths (Rubberandplas- ofhoseassemblies) Note. GB/T 9573-2013 Rubber and plastic hoses and hose assemblies—Hose dimensions and hose assembly length measurement methods (ISO 4671.2007, IDT) ISO 4926 Non-petroleum based fluids for hydraulic braking systems of road vehicles (Roadvehicles-Hydraulicbrakingsys- d) Low temperature flexural properties. When tested according to ISO 10619-2.2011 Method B, a hose or pure rubber hose is pre-filled Liquid C in ISO 1817, at 21°C±2°C for 72h±2h, then at -40°C±2°C for 72h±2h, The mandrel with a radius of 12 times the nominal inner diameter of the hose or 25 times the nominal inner diameter of the pure rubber hose is also subjected to low temperature treatment, and then still Under the low temperature of -40℃±2℃, bend the rubber hose or pure rubber hose, and check if there is no crack at 2 times magnification. At this time, the rubber is soft The tube or pure rubber tube shall meet the requirements of the burst pressure of test a). e) Internal cleanliness. When measured according to Appendix A, the insoluble impurities should not exceed 5g/m2, and the fuel soluble impurities should not exceed 5g/m2. 3g/m2. f) Extractable wax. When measured according to Appendix A, the extractable wax should not exceed 2.5g/m2. g) Tear resistance (applicable only to pure rubber hose). When measured according to Appendix B, the minimum tear strength should be 4.5kN/m. h) Ozone resistance. when tested under the following conditions according to method 1 of ISO 7326.2006, 2 times magnification inspection, hose or pure There should be no cracks in the hose. Ozone partial pressure 50mPa±3mPa; Time 72h±2h; Temperature 40℃±2℃; Elongation 20%. i) Heat aging resistance. When aged in accordance with ISO 188 under one or more of the following time and temperature conditions, all structures shall comply with Requirements for test c) adhesive strength, test d) low temperature flexural performance, and test h) ozone resistance. 1) 1000h at 80℃; 2) 1000h at 100℃; 3) 1000h at 125℃; 4) 168h at 100℃; 5) 168h at 125℃; 6) 168h at 140℃. Note. The 1000h test temperature represents the long-term operating temperature, and the 168h test temperature represents the short-term peak operating temperature. j) Resistance to oil surface contamination. when tested in accordance with Annex C using No. 3 oil of ISO 1817, all structures shall comply with test c) Requirements for bond strength, test d) low temperature flexural properties and test h) ozone resistance. k) Resistance to surface contamination of non-petroleum hydraulic (brake/clutch) fluids. when tested in accordance with Appendix C using hydraulic fluids of ISO 4926 All structures shall meet the requirements of test c) adhesive strength, test d) low temperature flexural properties and test h) ozone resistance. l) Bending resistance (this requirement only applies to straight hoses and pure rubber hoses with a nominal inner diameter less than or equal to 16mm). when pressing When measuring according to ISO 10619-1, the maximum deformation coefficient (T/D) shall not be less than 0.7.Hose with a nominal inner diameter of 11mm and below The core type used for and pure rubber hoses is 140mm in diameter; the core type used for hoses and pure rubber hoses with a nominal inner diameter of 12mm to 16mm The diameter is 220mm. m) Vacuum resistance (this requirement only applies to straight hoses and pure rubber hoses). When the hose or pure rubber hose is in accordance with ISO 7233.2006 Method A Carry out the test, during 15s to 60s under 0.08MPa absolute pressure, a ball with a diameter of 0.8 times the nominal inner diameter of the hose should be Can pass through the whole hose or pure rubber. n) Fuel resistance performance. When tested according to SAEJ2260 methanol fuel resistance test method, use one or more of the following test fuels Test at 60℃±2℃ fuel temperature for 5000h, all structures should meet test c) bond strength, test d) low temperature flexure Performance, test h) ozone resistance, test l) bending resistance and test m) requirements for vacuum resistance. 1) A mixture of 85% volume fraction of liquid C (ISO 1817) and 15% volume fraction of methanol; 2) A mixture of 75% volume fraction of liquid C (ISO 1817) and 25% volume fraction of methanol; 3) A mixture of 50% volume fraction of liquid C (ISO 1817) and 50% volume fraction of methanol; 4) A mixture of 85% volume fraction of methanol and 15% volume fraction of liquid C (ISO 1817); 5) 100% volume fraction methanol; 6) Prepare the mixture in accordance with Appendix D and peroxidize it to a peroxide value of 90.After every 70h test, use the method given in D.5 Recheck the peroxide value of the test fuel. If the peroxide value drops below 80, replace with fresh test fuel. o) Burn-through resistance. When tested according to SAEJ2027, the hose or pure rubber hose shall withstand flame exposure for at least 60s without pressure loss. p) Circulating fuel penetration rate (only RP hose and pure rubber hose). measured according to SAEJ1737, at 60°C and 13.8kPa , the permeation rate for a mixture of 75% by volume liquid C (ISO 1817) and 25% by volume methanol should not exceed 60g/m2/24h. q) Resistance. When measured according to ISO 8031.2009 4.5~4.7, the resistance should not exceed 10MΩ. r) Copper corrosion and formation of crystalline salts. When tested in accordance with Appendix E, the dark rust on the copper strip shall not be greater than Grade 1 of ASTM D130. Nor should crystals form on the copper strip, lining material or the bottom of the test tube. s) Life cycle test (Type 1, Type 2 and Type 3 only). When tested according to Appendix F, the hose or pure rubber hose shall meet the test c) Adhesion requirements for combined strength, test d) low temperature flexural properties and test h) ozone resistance.7 Test frequencyType test and routine test are specified in Appendix H and Appendix I respectively. Type tests are the basis for manufacturers to demonstrate that their production methods and hose designs comply with all the requirements of this standard and are carried out every 5 years at most Once, or whenever there is a change in manufacturing methods or materials, the test should be performed. Routine testing shall be performed on each finished hose or hose assembly prior to dispatch. Production acceptance tests are those specified in Annex J, which are carried out by the manufacturer in order to control the quality of its manufacture. as specified in Appendix J Test frequency is for guidance only.8 flagsAll structures shall be consecutively marked with the following. a) Manufacturer's name or trademark, such as. xxxx; b) the document number; c) classification according to Chapter 4; d) inner diameter, in millimeters (mm); e) fuel, i.e. gasoline; f) year and quarter of manufacture; g) Code of construction material according to ISO 1629.Appendix A(normative) Cleanliness and Extractables Testing A.1 Overview This appendix specifies the presence of insoluble impurities ("dirt"), liquid C solubles, and waxes in hoses and pure rubber hoses in liquid fuel lines Quantitative determination of extracts. A.2 Principle A certain amount of ISO 1817 liquid C is injected into a sample of a hose or pure rubber hose, and it is parked at room temperature for 24h. Then pour the sample Empty, and flush the inner wall by the self-flow of liquid C. The entire solution was collected, insoluble material was filtered off, dried and weighed. Evaporate the remaining solution to dryness and calculate the liquid C solubles total content. The wax was dissolved from the residue with methanol and the resulting solution was evaporated to dryness and weighed. A.3 Apparatus and materials A.3.1 Glass filter funnel. A.3.2 Evaporating dish (two). A.3.3 Beaker, 250cm3. A.3.4 Fuel evaporator, equipped with extraction hood. A.3.5 Ventilation drying oven, which can be kept at 85℃±5℃. A.3.6 Balance, accurate to 0.1mg. A.3.7 Sintered glass filter, the porosity is P3. A.3.8 Liquid C, in accordance with ISO 1817. A.3.9 Methanol, the minimum purity is 99%. A.3.10 Metal plugs are used to close the ends of hoses and pure rubber hoses. A.4 Procedure Take a 300mm~500mm long hose or pure rubber hose and measure its inner diameter. Plug one end with a metal plug (A.3.10) and hang it vertically. hang. Fill the sample with liquid C (A.3.8) and close its upper end with another metal plug. To calculate the internal surface area in contact with liquid C, it is necessary to Take into account the area in contact with the plug. The sample was parked at 21°C±2°C for 24h±30min. Then, remove one of the metal plugs and pour the contents into the beaker (A.3.3). Then pull out another metal plug, and put the hose or pure glue The tube hangs vertically above the beaker. With the aid of a filter funnel (A.3.1), rinse the inside of the hose or pure rubber tube with liquid C 5 times, each time 20cm3. Filter the entire contents of the beaker with a pre-weighed sintered glass filter (A.3.7) and rinse the beaker with a small amount of cleaning liquid C. The filtrate was collected in a previously weighed evaporating dish (A.3.2). Dry the filter in a drying oven (A.3.5) at 85°C ± 5°C until the mass constant. Calculate the total mass of insoluble matter. Place the evaporating dish and its contents on the fuel vaporizer (A.3.4) under the extraction hood to evaporate the liquid to dryness. Dry at 85°C ± 5°C Dry the residue in a drying oven until the mass reaches a constant value. Calculate the total mass of solubles extracted by Liquid C. Keep the dried residue in the evaporating dish under the extraction hood at 21℃±5℃ for 16h, then dissolve the residue at the same temperature In 30cm3 of methanol (A.3.9). The solution was filtered through a sintered glass filter into a second pre-weighed evaporating dish. use Rinse the first evaporating dish with 10 cm3 of clean methanol and filter as before, rinse and filter one more time. Place the second evaporating dish containing the filtrate on the fuel evaporator under the extraction hood to evaporate all the methanol. at 85℃±5℃ Dry the remainder in a drying cabinet until the mass reaches a constant value. Calculate the mass of methanol-dissolved waxy extract per unit of internal surface area, expressed in grams per square meter (g/m2).Appendix D(normative) Preparation of Peroxidation Test Fuel D.1 Overview This appendix specifies methods for preparing peroxidized ("acidic") gasoline test solutions for the determination of their resistance to elastomers, plastics and metals Materials and the effects of each component. This appendix applies to the use of tert-butyl hydroperoxide (70% aqueous solution), soluble copper ions (0.01mg/dm3) and containing 80% by volume ISO 1817 Liquid C, 15% by volume methanol and 5% by volume 2-methylpropan-2-ol (tert-butyl alcohol) Base fuel is prepared as a solution with a peroxide value of 90.Other base fuels and peroxide values may be used when required by engineering drawings or specifications. However, be aware that some base fuels may cause aqueous phase separation of the hydrogen peroxide-containing solution. This appendix also describes the determination of the peroxide value of the test fuels. D.2 Reagents D.2.1 tert-butyl hydroperoxide, 70% aqueous solution, density ρ=0.935g/cm3. D.2.2 Copper ion concentrate, with appropriate hydrocarbons as solvent, copper naphthenate solution with copper content of 6%~12% by mass fraction. D.2.3 2,2,4-trimethylpentane (iso-octane). Warning. Low flash point. D.2.4 Toluene. Warning. Low flash point. D.2.5 Methanol. Warning. Low flash point. D.2.6 2-Methylpropan-2-ol (tert-butyl alcohol). Warning. Low flash point. D.3 Instruments D.3.1 Polyethylene bottle, capacity 1000cm3, wide mouth with screw cap. D.3.2 Glass volumetric flask, capacity 1000cm3. D.3.3 Graduated pipette, capacity 10cm3. D.3.4 Graduated glass graduated cylinder, capacity 100cm3 and 1000cm3. D.4 Procedure WARNING. This procedure must be performed in a fume hood and protective goggles and disposable plastic gloves must be worn. D.4.1 Preparation of test liquid D.4.1.1 Base fuel mixture Liquid C of ISO 1817 was prepared by mixing equal volumes of 2,2,4-trimethylpentane (D.2.3) and toluene (D.2.4). stored in dark inside a glass bottle. Mix ISO 1817 liquid C, methanol (D.2.5) and 2-methylpropan-2-ol (D.2.6) in a volume ratio of 80.15.5 to prepare a basic fuel. Store in dark glass bottles. D.4.1.2 Copper ion stock solution (1mg/dm3) Add an appropriate volume of copper ion concentrate (D.2.2) into the base fuel to make 1000cm3 with a mass concentration of 1.140mg/cm3 Copper ion solution (Cu-1). Store in dark glass bottles. 100cm3Cu-1 was added to 1040cm3 base fuel to make a copper ion solution (Cu-2) with a mass concentration of 0.1mg/cm3. Store in dark glass bottles. Add 10cm3Cu-2 to 990cm3 base fuel to make a copper ion stock solution with a mass concentration of 1.0mg/dm3 (CSS). Store in dark glass bottles. D.4.1.3 Preparation of peroxidation test fuel Use the mixture specified in Table D.1 to make a test fuel with a peroxide value of 90.Store in a dark place in a polyethylene bottle, storage not exceeding four weeks. Immediately after mixing and before subsequent use, use the titration test method described in D.5 to check the peroxide value. Use 1000cm3 volumetric flask (D.3.2) to hold 500cm3 base fuel oil, add tert-butyl hydroperoxide solution (D.2.1) and copper ion reserve Solution (CSS) (D.4.1.2), then make up to 1000cm3 with base fuel oil, shake well to dissolve hydrogen peroxide in the ethanol phase of base fuel oil water in solution. D.5 Peroxidation Test Determination of Peroxidation Value of Fuel Oil by Titration D.5.1 General This clause specifies a titration method for the determination of the peroxide value of oxidized ("acidified") test fuel oils prepared by the procedure specified in D.4. This method can be used to determine the peroxide value of a peroxidation test fuel during immersion or cycle testing. However, the following precautions should be followed matter. a) Most tests involving elastomers will result in yellowing of the test liquid due to extraction of additives from the rubber. This should be determined be taken into account when titrating the endpoint; b) Additives extracted from the tested material may release free iodine from the iodide solution. Therefore, a peroxide-free Hydrogen base fuel is subjected to repeated immersion or cycle tests as blank tests. D.5.2 Reagents Unless otherwise stated, use only approved analytical grade reagents and distilled water or water of equivalent purity. D.5.2.1 Potassium iodide, 100g/dm3 solution. Stored in a dark reagent bottle, if a blank titration is performed, the peroxide value of this solution is 2 or greater than 2, it is discarded. D.5.2.2 Sodium thiosulfate, standard titration solution, c(Na2S2O3)=0.1mol/dm3. D.5.2.3 Acetic acid/propan-2-ol mixture, mix 100cm3 glacial acetic acid with 1150mL propan-2-ol and store in a glass bottle. D.5.3 Instruments D.5.3.1 Erlenmeyer flask (Erlenmeyer flask), capacity 250cm3, with frosted glass neck. D.5.3.2 Condenser, Alin or Liebig water-cooled, with a frosted glass connector for connection with the conical flask (D.5.3.1). D.5.3.3 Glass graduated cylinder with a capacity of 100cm3. D.5.3.4 A hot plate or other heating tool is suitable for heating a conical flask equipped with a condenser for refluxing reagents. D.5.3.5 Glass burette, capacity 10cm3. D.5.4 Procedure D.5.4.1 Add 25cm3 of acetic acid/propan-2-ol mixture (D.5.2.3) to a 250cm3 conical flask (D.5.3.1). D.5.4.2 Add 10cm3 potassium iodide solution (D.5.2.1) to the conical flask. D.5.4.3 Use a pipette (D.3.3) to accurately transfer 2cm3 of the peroxide test liquid prepared in accordance with D.4.1.3 into a conical flask. D.5.4.4 Install the condenser (D.5.3.2) on the conical flask, and reflux gently on the hot plate for 5min to release free iodine. D.5.4.5 Cool the conical flask in a cold water bath, and rinse the condenser with 5cm3 of water. D.5.4.6 Remove the condenser and titrate the solution in the conical flask with sodium thiosulfate solution until the yellow color just disappears. Record the sulphur consumed Substitute volume V1 of sodium sulfate solution. D.5.4.7 Repeat the steps of D.5.4.1~D.5.4.6 for blank determination, but omit the peroxidation test fuel (D.5.4.3), record the consumed fuel ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 24141.2-2022_English be delivered?Answer: Upon your order, we will start to translate GB/T 24141.2-2022_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. 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