GB/T 20735-2006 PDF EnglishUS$85.00 · In stock · Download in 9 seconds
GB/T 20735-2006: Pressure regulator of CNG vehicles Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 20735-2006: Pressure regulator of CNG vehicles---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/GBT20735-2006GB ICS 43.080 T 47 National Standard of the People’s Republic of China Pressure regulator of CNG vehicles Issued on: DECEMBER 29, 2006 Implemented on: JUNE 1, 2007 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 5 4 Requirements ... 6 5 Test methods ... 9 6 Inspection rules ... 14 7 Marks, packaging, transportation and storage ... 15 8 Exit-factory documents ... 16ForewordThis Standard was proposed by and shall be under the jurisdiction of the National Technical Committee for Standardization of Automobiles. Drafting organizations of this Standard. Chongqing Automobile Research Institute, and Chongqing Dinghui Automobile Fuel Gas System Co., Ltd. Main drafters of this Standard. Chen Wanying, Zhang Haihui, Liu Jun, and Wang Shu. Pressure regulator of CNG vehicles1 ScopeThis Standard specifies the model label, requirements, test methods, inspection rules, marks, packaging, transportation and storage of the pressure regulator of compressed natural gas (hereinafter referred to as CNG) vehicles. This Standard applies to the pressure regulators of CNG vehicles (hereinafter referred to as pressure regulators) whose nominal operating pressure is not more than 20MPa (the pressure described in this Standard refers to gage pressure), whose operating ambient temperature is within the range of -40°C ~ 120°C, and whose working medium meets the requirements specified in the GB 18047.2 Normative referencesThe provisions in the following documents become the provisions of this Standard through reference in this Standard. For 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 versions apply to this Standard. GB/T 528 Rubber, vulcanized or thermoplastic – Determination of tensile stress-strain properties (GB/T 528-1998, eqv ISO 37.1994) GB/T 3765 24° cone connectors – Specification GB/T 7762 Rubber, vulcanized or thermoplastic – Resistance to ozone cracking – Static strain test (GB/T 7762-2003, ISO 1431-1.1989 Rubber, vulcanized or thermoplastic – Resistance to ozone cracking – Part 1. Static and dynamic strain testing, MOD) GB 9969.1 General principles for preparation of instructions for use of industrial products GB/T 10125 Corrosion tests in artificial atmospheres – Salt spray tests (GB/T 10125-1997, eqv ISO 9227.1990) GB/T 17895 Natural gas vehicle and liquefied petroleum gas vehicle – Vocabulary GB 18047 Compressed natural gas as vehicle fuel GB/T 19240 Mounting requirements of special equipment for compressed natural gas vehicles CB/T 3764 Thickness series and quality requirements for metallic and chemical coatings QC/T 245 Technical specifications for isolated plant of compressed-natural- gas (CNG) automobile3 Terms and definitionsThe terms and definitions established in the GB/T 17895 and the following ones apply to this Standard. 3.1 First grade designed pressure P1 It refers to the maximum operating pressure of the first grade chamber of the pressure regulator. 3.2 Rated flow Q It refers to the maximum flow obtained by the pressure regulator when the ambient temperature is 20°C, the intake pressure of the pressure regulator is rated operating pressure, and the first grade pressure of the working chamber is P1. 3.3 Safety valve open pressure P2 It refers to the pressure when the pressure relief valve is initially open. The pressure value P2 equals to 1.3P1. 3.4 Safety valve emission pressure PRV It refers to the upper pressure limit when the pressure relief valve is totally open. The pressure value PRV equals to 2P1. The rated flow Q of the pressure regulator measured according to the test methods specified in the Article 5.6 shall not be less than the calibration value of the manufacturer. 4.2.5 Durability After being conducted with the durability test according to the provisions specified in the Article 5.7, the pressure regulators shall meet the requirements specified in the Articles 4.2.3 and 4.2.4. 4.2.6 Corrosion resistance After being conducted with the salt spray test according to the test methods specified in the Article 5.8.1, the pressure regulators shall meet the requirements specified in the Article 4.2.3.1. USE a 25× magnifier to check the brass pressure-bearing components whose zinc content is greater than 15% after conducting the test according to the test methods specified in the Article 5.8.2. There shall be no cracks on the components. 4.2.7 Ozone resistance After being conducted with the ozone resistance test according to the test methods specified in the Article 5.9, the non-metallic parts and components of pressure regulators in contact with the natural gas shall have no cracks. 4.2.8 Compatibility After the non-metallic parts and components of pressure regulators are conducted with the compatibility test according to the test methods specified in the Article 5.10, the volumetric change rate shall not be greater than 20%, and the mass decrease rate shall not be greater than 5%. 4.2.9 Vibration resistance After being conducted with 6-hour vibration test according to the test methods specified in the Article 5.11, the pressure regulators shall meet the requirements specified in the Article 4.2.3.1. 4.2.10 Dry heat resistance 5.3 Hydrostatic strength test REMOVE the pressure relief valve first. SEAL this location afterwards. BLOCK the outlet of the pressure regulator. APPLY 40MPa pressure at the inlet. KEEP this pressure for no less than 1min. CHECK the pressure regulator afterwards. The components conducted with this test shall not be used any longer. 5.4 Performance test for the pressure relief valve The test for the pressure relief valve of the pressure regulator can be conducted separately or on the pressure regulator. The inlet diameter of the gas source shall not be less than that of the pressure regulator. When the test is conducted on the pressure regulator, various levels of pressure relief mechanisms shall be removed from the pressure regulator, and the outlet of the pressure regulator shall be blocked as well. Furthermore, the specified test pressure shall be applied at the inlet afterwards. a) SET the inlet pressure of the pressure relief valve as 95% of P2. b) SET the inlet pressure of the pressure relief valve as 105% of P2. c) USE the input pressure at the inlet of the pressure relief valve PRV to totally open the pressure relief valve. CUT off the gas source to close the pressure relief valve and to complete one cycle. Each cycle shall last for 3s. REPEAT the above procedures 100 times. d) ADJUST the gas supply pressure to PRV. MEASURE the emission flow QRV of the pressure relief valve. 5.5 Gas leakage test 5.5.1 Gas tightness at room temperature The gas leakage test shall be conducted according to the Articles 5.5.1.1 and 5.5.1.2. 5.5.1.1 Bubble observation method a) CONNECT the sample inlet with the gas supply pipeline. b) BLOCK the sample outlet. c) IMMERSE the samples 100mm to 300mm below the surface of the water. contact with the natural gas for 20% according to the provisions specified in the GB/T 7762. PLACE the non-metallic parts and components in the ozone chamber with the ozone concentration of 50 × 10-8 ± 5 × 10-8 at 40 ± 2 °C for 120h. USE a 2× magnifier to check the surfaces of test pieces. 5.10 Compatibility test IMMERSE the non-metallic parts of pressure regulators in contact with the natural gas in the N-pentane or N-hexane at 23°C ± 2°C for 72h. PLACE the non-metallic parts and components in the air at 40°C for 48h. CHECK the volume change rate and mass change rate afterwards. 5.11 Vibration resistance test a) FIX the test samples on the vibration test stand in a reliable way; b) Respectively SET the frequency and amplitude as 17Hz and 1.5mm; c) Respectively CONDUCT 2-hour vibration along three mutually perpendicular directions; d) CHECK the gas tightness of test samples according to the methods specified in the Article 5.5. 5.12 Dry heat resistance test EXPOSE the non-metallic test parts and components of pressure regulators in contact with the natural gas in the air at 120°C ± 2°C for 168h. CHECK the variation in tensile strength and elongation according to the methods specified in the GB/T 528. 5.13 Temperature cycling test CONDUCT the temperature cycling test to the pressure regulators under the maximum operating pressure (the input gas pressure is 20MPa during the test). The temperature varies from the minimum operating temperature (-40°C) to the maximum operating temperature (120°C), and then... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 20735-2006 be delivered?Answer: The full copy PDF of English version of GB/T 20735-2006 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 20735-2006_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 20735-2006_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 20735-2006 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of GB/T 20735-2006?A step-by-step guide to download PDF of GB/T 20735-2006_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 20735-2006". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
