GB/T 28708-2012 PDF English
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Specification for size selection of seamless and welded steel pipe used in piping engineering
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GB/T 28708-2012: PDF in English (GBT 28708-2012) GB/T 28708-2012
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 Contents
Foreword ... 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) ... 15
Foreword
This 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 Engineering
1 Scope
This 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 References
The 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 Pipes
3 Dimension Series and Theoretical Masses of Pipes
3.1 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 PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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