GB/T 3091-2008 English PDF (GBT3091-2008)

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GB/T 3091-2008: Welded steel pipes for low pressure liquid delivery
GB/T 3091-2008
GB
ICS 77.140.75
H 48
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing GB/T 3091-2001
Welded Steel Pipes
for Low Pressure Liquid Delivery
(ISO 559.1991, NEQ)
ISSUED ON. MAY 13, 2008
IMPLEMENTED ON. NOVEMBER 01, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Content of ordering ... 8 
4 Dimension, appearance and weight ... 8 
5 Technical requirements ... 11 
6 Test methods ... 17 
7 Test rules ... 19 
8 Packing, marking and quality certificate ... 19 
Appendix A ... 20 
Appendix B ... 21 
Appendix C ... 23 
Foreword 
This standard is not equivalent to ISO 559.1991 “Steel Tubes for Water and Sewage”
(English edition).
This standard will replace GB/T 3091-2001 “Welded Steel Pipe for Low Pressure Liquid
Delivery”. There have been some significant changes in this standard over GB/T
3091-2001 in the following technical aspects.
— Add spiral seam submerged arc welding steel tube and relevant contents;
— Adjust external diameter and wall thickness series;
— It is stricter to the permissible variation of external diameter of steel tube whose
external diameter is larger than 508mm;
— It is stricter to the permissible variation of steel tube's wall thickness;
— Add permissible variation of weight;
— Add Q195 steel grade;
— It is stricter to the tensile test;
— It is stricter to the flattening test requirement;
— Add requirement of face guided bend test for submerged arc welding steel tube;
— Adjust hydraulic test value of steel tube;
— Clearly define the provisions about galvanizing coat.
Appendix A of this standard is informative; appendix B and appendix C are normative.
This standard was proposed by China Iron and Steel Association.
This standard is under the jurisdiction of National Technical Committee of Standardization
for Steel.
This standard was drafted by. Jinxi Steel Pipe Co., Ltd., Panyu Chu Kong Steel Pipe Co.,
Ltd., Jinghua Innovation Group Co., Ltd., and Zhejiang Kingland Pipeline Co., Ltd.
Chief drafting staffs of this standard. Qi Huijuan, Zhu Xingwei, Zhao Fuliang, Wang Lishu,
Shen Ganrong, Huang Kejian, and Yang Weifang.
The previous editions of the standard replaced by this standard are.
— GB/T 3091-1982, GB/T 3091-1993, GB/T 3091-2001.
Welded Steel Pipes
for Low Pressure Liquid Delivery
1 Scope 
This standard specifies the dimension, appearance, weight, technical requirements, test
method, test rules, packing, marking, and quality certificate of welded steel pipes for low
pressure liquid delivery.
This standard is applicable to welded steel pipes for delivering low pressure liquid such as
water, air, heating steam, and gasses.
This standard comprises longitudinal-seam high-frequency electrical resistance welded
(ERW) steel pipes, longitudinal-seam submerged arc we2ded (SAWL) steel pipe, and
spiral-seam submerged arc welded (SAWH) steel pipe. And it denotes the different
requirements to each of them respectively. Those without marks are simultaneously
applicable to longitudinal-seam high-frequency electrical resistance welded steel pipe,
longitudinal-seam submerged arc welded steel pipe, and spiral seam submerged arc
welded steel pipe.
2 Normative references 
The following documents contain provisions which, through reference in this standard,
constitute provisions of this standard. For dated reference, subsequent amendments to
(excluding corrigenda contents), or revisions of, any of these publications do not apply.
However, parties to agreements based on this standard are encouraged to investigate the
possibility of applying the most recent editions of the documents. For undated references,
the latest edition of the normative document referred to applies.
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 Methods for Chemical Analysis of Iron, Steel and Alloy; The reduced
molybdosilicate spectrophotometric method for the determination of acid-soluble
silicon content
GB/T 223.10 Methods for Chemical Analysis of Iron, Steel and Alloy; The Cupferron
Separation-chrome Azurol S Photometric Method for the Determination of Aluminium
Content
GB/T 223.11 Methods for Chemical Analysis of Iron, Steel and Alloy; he
Ammonium Persulfate Oxidation Volumetric Method for the Determination of
Chromium Content
GB/T 223.12 Methods for Chemical Analysis of Iron, Steel and All The Sodium
Carbonate Separation-diphenyl Carbazide Photometric Method for the Determination
of Chromium Contentoy;
GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy; The N-benzoy-
N-phenylhydroxylamine Extraction Photometric 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 Methods for Chemical Analysis of Iron, Steel and Alloy; The
Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content
GB/T 223.24 Methods for Chemical Analysis of Iron, Steel and Alloy; The Extraction
Seperation-The Dimethylglyoxine Spectrophotometric Method for the Determination of
Nickel Content
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 Analysis of Iron, Steel and Alloy; The Neutral
Titration Method for the Determination of Nitrogen Content after Distillation Separation
GB/T 223.37 Methods for Chemical Analysis of Iron, Steel and Alloy; The
Indophenal Blue Photometric Methods for the Determination of Nitrogen Content after
Distillation Separation
GB/T223.40 Iron Steel and Alloy-Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometri Method
GB/T223.53 Methods for Chemical Analysis of Iron, Steel and Alloy; The Flame Atomic
Absorption Spectrophotometric Method for the Determination of Nitrogen Content
GB/T 223.54 Methods for Chemical Analysis of Iron, Steel and Alloy; The Flame Atomic
Absorption Spectrophotornetric Method for the Determination of Nickel Content
GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy; The Sodium
Arsenite-Sodium Nitrite Titrimetric Method for the Determination of Manganese
Content
GB/T 223.59 Methods for Chemical Analysis of Iron, Steel and Alloy; The Reduced
Molybdoantimonyl Phosphoric Acid Phosphoric Method for the Determination of
Phosphorus Content
GB/T 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy; The Perchloric
Acid Dehydration Gravimetric Method for the Determination of Silicon Content
GB/T 223.61 Methods for Chemical Analysis of Iron, Steel and Alloy; The Ammonium
Phosphomolybdate Volumetric Method ...