GB/T 3091-2015 English PDF (GBT3091-2015)

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GB/T 3091-2015: Welded steel pipes for low pressure liquid delivery
GB/T 3091-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Replacing GB/T 3091-2008
Welded Steel Pipes for Low Pressure Liquid
Delivery
(ISO 559.1991, Steel Tubes for Water and Sewage, NEQ)
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
1 Scope ... 5 
2 Normative References ... 5 
3 Order Content ... 9 
4 Dimension, Shape and Weight ... 9 
4.1 Diameter and Wall-thickness ... 9 
4.2 Length ... 11 
4.3 Bending ... 11 
4.4 Out-of-roundness ... 12 
4.5 Pipe End ... 12 
4.6 Weight ... 13 
5 Technical Requirements ... 14 
5.1 Designations and Chemical Compositions of Steels ... 14 
5.2 Manufacturing Process ... 14 
5.3 Delivery State ... 14 
5.4 Mechanical Property ... 15 
5.5 Technical Property ... 16 
5.6 Hydraulic Test ... 17 
5.7 Surface Quality ... 17 
5.8 Steel Pipe Butting ... 19 
5.9 Galvanized Zinc Coating ... 19 
5.10 Other Requirements ... 20 
6 Test Method ... 20 
7 Inspection Rules ... 22 
7.1 Inspection and Acceptance ... 22 
7.2 Group-batch Rules ... 22 
7.3 Sampling Quantity ... 22 
7.4 Re-inspection and Judgment Rules ... 22 
8 Packing, Marking and Quality Certificate ... 22 
8.1 Marking on Steel Pipes ... 22 
8.2 Packing and Quality Certificate of Steel Pipes ... 22 
Appendix A ... 23 
Appendix B... 24 
Appendix C ... 27 
Foreword
This Standard is drafted in accordance with the rules specified in GB/T 1.1-2009.
This Standard replaces GB/T 3091-2008 Welded Steel Pipes for Low Pressure Liquid
Delivery. The main technical differences between this Standard and GB/T 3091-2008
are as follows.
— Revise the outer-diameter, wall-thickness and way of delivery of steel pipe
219.1mm or below;
— Revise the requirements on out-of-roundness of steel pipes;
— Revise the requirements on ends of steel pipes;
— Adjust part of steel designations;
— Revise delivery state of steel pipe;
— Add the requirements on zinc coating weight of galvanized steel pipe;
— Revise the rules on group-batch of steel pipes.
This Standard was redrafted by reference to ISO 559.1991 Steel Tubes for Water and
Sewage; it is not equivalent to ISO 559.1991.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of the National Technical Committee 183
on Iron and Steel of Standardization Administration of China (SAC/TC 183).
Drafting organizations of this Standard. Tianjin YouFa Steel Pipe Group Co., Ltd.,
Panyu Chu Kong Steel Pipe Co., Ltd., Zhejiang Kingland Pipeline and Technologies
Co., Ltd., Tianjin Juncheng Steel Pipe and Technologies Co., Ltd., Tianjin Lida Steel
Pipe Group Co., Ltd., Jinghua Innovation Group Co., Ltd., Handan Zhengda Steel Pipe
Co., Ltd., Baoji Petroleum Steel Pipe Co., Ltd. AND China Metallurgical Information
and Standardization Research Institute.
Chief drafting staffs of this Standard. Yin Jiuxiang, Chen Guangling, Wang Lishu, Shen
Ganrong, Guo Jianjun, Yu Fuqiang, Wen Chaojiang, Jiang Haidong, Wang Hui, Dong
Li, Zhao Fuliang, Zhang Songming, Yang Weifang, Wang Yaping and Hou Jie.
The previous editions replaced by this Standard are as follows.
— GB/T 3091-1982, GB/T 3091-1993, GB/T 3091-2001, GB/T 3091-2008;
— GB/T 3092-1982, GB/T 3092-1993;
Welded Steel Pipes for Low Pressure Liquid Delivery
1 Scope
This Standard specifies dimension, shape, weight, technical requirements, test
methods, inspection rules, packing, marking and quality certificate of welded steel
pipes for low pressure liquid delivery.
This Standard is applicable to electric-welding longitudinal-seam steel pipe,
submerged arc-welding longitudinal-seam (SAWL) steel pipe and submerged arc-
welding helical-seam (SAWH) steel pipe for low pressure liquid delivery of water, air,
heating steam, fuel gas, etc.; and it makes the marking to their respective different
requirements; non-marking requirements are applicable to high-frequency electric-
welding longitudinal-seam steel pipe, submerged arc-welding longitudinal-seam steel
pipe and submerged arc-welding helical-seam steel pipe.
2 Normative References
The following documents are essential for the application of this Standard. For dated
references, only the edition cited applies. For the undated references, the latest
editions of the normative documents (including all the amendments) are applicable to
this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel
Products
GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Diantipyrylmethane Phosphomolybdate Gravimetric Method
for the Determination of Phosphorus Content
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and
Total Silicon Content - Reduced Molybdosilicate
Spectrophotometric Method
GB/T 223.9 Iron Steel and Alloy - Determination of Aluminium Content -
Chrom Azurol S Photometric Method
GB/T 223.11 Iron Steel and Alloy - Determination of Chromium Content -
Visual Titration or Potentiometric Titration Method
GB/T 223.12 Methods for Chemical Analysis of Iron, Steel And Alloy - The
Sodium Carbonate Separation-diphenyl Carbazide
Photometric Method For The Determination Of Chromium
Content
GB/T 223.14 Methods for Chemical Analysis of Iron, Steel And Alloy - The
Ammonium Ferrous Sulfate Titration Method for the
Determination of Vanadium Content
GB/T 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Chromotropic Acid Photometric Method for the Determination
of Titanium Content
GB/T 223.18 Methods for Chemical Analysis of Iron, Steel And Alloy - The
Sodium Thiosulfate Separation Iodimetric Method for the
Determination of Copper Content
GB/T 223.19 Methods for Chemical Analysis of Iron Steel And Alloy - The
Neocuproine-chloroform Extraction Photometric Method for
the Determination of Copper Content
GB/T 223.23 Iron Steel and Alloy - Determination of Nickel Content - The
Dimethylglyoxime Spectrophotometric Method
GB/T 223.24 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Extraction Separation - The Dimethylglyoxime
Spectrophotometric Method for the Determination of Nickel
Content
GB/T 223.26 Iron Steel and Alloy - Determination of Molybdenum Content
- The Thiocyanate Spectrophotometric Method
GB/T 223.32 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Hypophosphite Reduction-iodimetric Method for the
Determination of Arsenic Content
GB/T 223.36 Methods for Chemical Ana...