1 Scope
This standard specifies the dimension, appearance, mass, performance requirements, test method, inspection rules, coating, marking and quality certificate of submerged arc-welded steel pipe for common fluid service pipeline (including longitudinally submerged arc welding (LSAW) steel pipe and spirally submerged arc welding (SSAW) steel pipe, hereinafter referred to as "steel pipe").
This standard is applicable to steel pipes used for conveying pipeline for such common fluids as water, sewage, air and heating steam and steel pipes used for conveying pipeline for other fluids with similar requirements.
Note: Steel pipe delivery is carried out by either theoretical mass or actual mass (weighing), which shall be indicated in the Order Contract (see 4.6.2 for details).
2 Normative References
The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223 Chemical Analysis of Iron, Steel and Alloy
GB/T 241 Metal Materials - Tube - Hydrostatic Pressure Test
GB/T 700 Carbon Structural Steels
GB/T 2651 Tensile Test Method on Welded Joints
GB/T 3323 Radiographic Examination of Fusion Welded Joints in Metallic Materials
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method)
GB/T 9445 Non-destructive Testing - Qualification and Certification of NDT Personnel
GB/T 23901.1 Non-destructive Testing - Image Quality of Radiographs - Part 1: Image Quality Indicators (Wire Type) - Determination of Image Quality Value (GB/T 23901.1-2009, ISO 19232-1: 2004, IDT)
SY/T 6475 Dimensions and Masses per Unit Length of Steel Pipe for Petroleum and natural Gas
ISO 10893-6 Non-destructive Testing of Steel Tubes - Part 6: Radiographic Testing of the Weld Seam of Welded Steel Tubes for the Detection of Imperfections
ISO 10893-7 Non-destructive Testing of Steel Tubes - Part 7: Digital Radiographic Testing of the Weld Seam of Welded Steel Tubes for the detection of Imperfections
ISO 10893-8 Non-destructive Testing of Steel Tubes - Part 8: Automated Ultrasonic Testing of Seamless and Welded Steel Tubes for the Detection of Laminar Imperfections
ISO 10893-11 Non-destructive Testing of Steel Tubes - Part 11: Automated Ultrasonic Testing of the Weld Seam of Welded Steel Tubes for the Detection of Longitudinal and/or Transverse Imperfections
3 Symbol
For the purposes of this standard, the following symbols apply.
D——the nominal outer diameter of steel pipe, mm;
t——the nominal wall thickness of steel pipe, mm;
M——the mass per unit length of steel pipe, kg/m;
p——the hydrostatic test pressure, MPa;
S——the hydrostatic test hoop stress, MPa;
H——the weld reinforcement, mm;
L——the length of single steel pipe, mm.
Foreword i
1 Scope
2 Normative References
3 Symbol
4 Dimension, Appearance and Mass
4.1 Outer Diameter and Wall Thickness
4.2 Length
4.3 Ovality
4.4 Straightness
4.5 Pipe End
4.6 Mass
5 Technical Requirements
5.1 Manufacturing Method
5.2 Steel Grade
5.3 Chemical Component
5.4 Mechanical Performance
5.5 Hydrostatic Test
5.6 Non-destructive Testing
5.7 Appearance Quality
5.8 Other Surface Defect and Imperfection
5.9 Treatment of Imperfection and Defect
5.10 Regrinding and Repair Requirements
6 Inspection and Test Method
6.1 Chemical Component
6.2 Tensile Test
6.3 Hydrostatic Test
6.4 Non-destructive Testing
7 Inspection Rules
7.1 Surface and Dimensional Inspection
7.2 Chemical Composition of Base Material
7.3 Tensile Test of Welded Joints
7.4 Non-destructive Testing
8 Coating, Marking and Quality Certificate
8.1 Coating
8.2 Marking
8.3 Quality Certificate
Appendix A (Informative) X-ray Inspection
