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GB/T 28708-2012: Specification for size selection of seamless and welded steel pipe used in piping engineering 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 28708-2012: Specification for size selection of seamless and welded steel pipe used in piping engineering---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/GBT28708-2012 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.040.60 J 15 Specification for Size Selection of Seamless and Welded Steel Pipe Used in Piping Engineering ISSUED ON: SEPTEMBER 3, 2012 IMPLEMENTED ON: MARCH 1, 2013 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 Dimension Series and Theoretical Masses of Pipes... 4 Appendix A (informative) Descriptions of Pipe Schedule Number (Sch) ... 15ForewordThis Standard was drafted in accordance with the rules provided in GB/T 1.1-2009. This Standard was proposed by China Machinery Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee on Piping Fittings of Standardization Administration of China (SAC/TC 237). The drafting organizations of this Standard: SINOPEC Engineering Incorporation; Luoyang Petrochemical Engineering Corporation Ltd. of SINOPEC; China Machinery Productivity Promotion Center; MCC Capital Engineering & Research Incorporation Limited; East China Design Branch of China Petroleum Engineering and Construction Corporation; Guangdong Electric Power Design Institute. The main drafters of this Standard: Ke Songlin, Zhao Yong, Wang Jinfu, Li Junying, Shu Zonghan, Liu Jian, Huang Tao, Feng Feng. Specification for Size Selection of Seamless and Welded Steel Pipe Used in Piping Engineering1 ScopeThis Standard specifies the dimension series and theoretical masses of carbon steel, alloy steel, stainless steel seamless steel pipes and welded steel pipes for piping engineering. This Standard is applicable to the selection of steel pipes for liquid delivery in piping engineering.2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 3091 Welded Steel Pipe for Low Pressure Liquid Delivery GB/T 17395-2008 Dimensions, Shapes, Masses and Tolerances of Seamless Steel Tubes GB/T 21835-2008 Dimensions and Masses per Unit Length of Welded Steel Pipes3 Dimension Series and Theoretical Masses of Pipes3.1 Outer Diameter Series of Pipes The outer diameter of pipes is divided into Series I and Series II. Series I is a general-purpose series and a recommended series for selection; Series II is a non-universal series. The nominal dimensions and outer diameters of steel pipes are shown in Table 1.Appendix A(informative) Descriptions of Pipe Schedule Number (Sch) A.1 Definition of Pipe Schedule Number (Sch) Pipe schedule number, code name: Sch, is defined as follows: The ratio of the design pressure to the allowable stress of the pipe material at the design temperature is multiplied by 1,000, and rounded off, which is the code representing the pipe wall thickness series. A.2 Source of Pipe Schedule Number (Sch) Pipe schedule number (Sch) was firstly specified in the American standard ANSI/ASME B36.10《WELDED AND SEAMLESS WROUGHT STEEL PIPE》and has been used to this day. A.3 Correspondence between Pipe Schedule Number (Sch) and Steel Pipe Wall Thickness The calculation formula for the steel pipe wall thickness is as follows: Where, t---the wall thickness, expressed in (mm); P---the design pressure, expressed in (MPa); D---the outer diameter, expressed in (mm); S---the allowable stress of the material at design temperature, expressed in (MPa); 2.54---the corrosion allowance and thread depth, expressed in (mm); 1.75---2 (1 12.5%), 12.5% is the negative deviation of steel pipe wall thickness. Take Sch = P/S 1,000. The wall thickness value corresponding to the Sch number can be approximately obtained from the above Formula. For example, the wall thickness corresponding to Sch 40 is approximately equal to the calculated value of t = 0.040 D/1.75 + 2.54. A.4 Significance of Pipe Schedule Number (Sch) ---Pipe schedule number (Sch) does not indicate the specific wall thickness, but the wall ......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 28708-2012 be delivered?Answer: The full copy PDF of English version of GB/T 28708-2012 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 28708-2012_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 28708-2012_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. 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