A139 LSAW Structural Pipes

A139 longitudinal welded pipes come in five grades: GRA, GRB, GRC, GRD, and GRE. These welded pipes are primarily produced using the high-frequency straight seam welding method and are mainly used for transporting liquids, gases, or steam. As a professional manufacturer of A139 electric resistance welded pipes, GNEE Group can provide you with A139 high-frequency welded straight seam pipes, A139 spiral welded pipes, and A139 carbon steel structural pipes. Our A139 welded pipes have been exported to over 8,000 companies worldwide. If you need A139 welded pipes, please feel free to contact us for inquiries.

A139 Welded Tubes Specification

Size	4" to 26"
Schedules	20, 30, 40, Standard (STD), Extra Heavy (XH), 80, 100, 120, 140, 160, XXH & heavier
Grades	ASTM A139 Grade A, ASTM A139 Grade B, ASTM A139 Grade C, ASTM A139 Grade D, ASTM A139 Grade E
Type	ERW / Welded / LSAW/ SSAW
Length	Single Random, Double Random & Required Length, Custom Size – 12 Meter lengths
End	Plain End, Beveled End, Treaded
End Protection	Plastic Caps
Applications	Oil Refineries, Petrochemicals, Power Generation (Nuclear/Thermal), Steel, Sugar, Boiler Equipments, Pressure Vessels and General Engineering Purposes
Paymeny Terms	L/C, T/T
Terms of Trade	FOB, CFR, CIF, DDP, EXW

 

 

A139 Welded Steel Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A139 LSAW Pipe Test

• Inspection of Geometric Dimensions of A139 Steel Pipes

1. Wall Thickness Inspection of Steel Pipes: Use a micrometer and an ultrasonic thickness gauge. Measure at no fewer than 8 points on both ends and record the results.

2. Outer Diameter and Ovality Inspection of Steel Pipes: Use a calliper, vernier calliper, and ring gauge to measure the maximum and minimum points.

3. Length Inspection of Steel Pipes: Use a steel tape measure for manual or automatic length measurement.

4. Straightness Inspection of Steel Pipes: Use a straight edge, a 1-metre spirit level, a feeler gauge, and a fine line to measure the deflection per metre and the total length.

5. Bevel Angle and Root Face Inspection of Steel Pipe Ends: Use an angle gauge and a calliper gauge.

• Inspection of the Internal and External Surfaces of Steel Pipes

1. Manual Visual Inspection: Performed under specific lighting conditions, following standards and leveraging experience, identification, and rotating the steel pipe.

2. Non-Destructive Testing (NDT):

a. Ultrasonic Testing (UT):
- Sensitive to surface and internal crack defects in homogeneous materials of various compositions.

b.Eddy Current Testing (ET) (Electromagnetic Induction):
- Mainly sensitive to point-like (pinhole) defects.

c. Magnetic Particle Testing (MT) and Magnetic Flux Leakage Testing:
- Magnetic testing suitable for detecting surface and near-surface defects in ferromagnetic materials.

d. Electromagnetic Ultrasonic Testing:
- Does not require a coupling medium, can be applied for high temperature and high-speed testing on rough steel pipe surfaces.

e. Penetrant Testing:
- Uses fluorescence and dye to detect surface defects on steel pipes.

• Chemical Composition Analysis

1. Infrared C-S Analyser: Analyses C and S elements in ferroalloys, steelmaking raw materials, and steel.

2. Direct Reading Spectrometer: Analyses elements such as C, Si, Mn, P, S, Cr, Mo, Ni, Cu, Al, W, V, Ti, B, Nb, As, Sn, Sb, Pb, and Bi in solid samples.

3. N-O Analyser: Analyses gas content, specifically N and O.

• Inspection of Mechanical

1. Tensile Test: Measures stress and deformation to determine material strength (YS, TS) and plasticity indices (A, Z). Longitudinal, transverse samples, pipe sections, arc-shaped, and circular samples (diameter: 10mm, 12.5mm) are used. Different sizes and thicknesses of samples are tested with specified gauge lengths. Note: Elongation after fracture of the specimen is related to the specimen size (GB/T 1760).

2. Impact Test: CVN, notched C-type, V-type, and J-value (Joules per square centimetre). Standard sample size: 10×10×55 mm, non-standard sample size: 5×10×55 mm.

3. Hardness Test: Measures various hardness types such as Brinell hardness (HB), Rockwell hardness (HRC), Vickers hardness (HV), etc.

4. Hydrostatic Test: Determines test pressure, stabilisation time, where \( p = \frac{2S\delta}{D} \).

• Technological Properties

1. Flattening Test: Conducted on circular and C-shaped samples (when S/D > 0.15), where \( H = \frac{{(1+2)S}}{{\alpha + \frac{S}{D}}} \) and \( L \) ranges from 40 to 100 mm. The unit length deformation coefficient is between 0.07 and 0.08.

2. Ring Tensile Test: Conducted with a length (L) of 15mm, with no cracks considered as qualified.

3. Expansion and Flaring Test: The top cone angle is set to 30°, 40°, or 60°.

4. Bending Test: Can substitute for flattening test (for large-diameter pipes).

• Non-Destructive Testing (NDT)

1. Surface Defect Inspection of Weld Seams: Examining the surface of weld seams for defects such as cracks, incomplete penetration, and lack of fusion to ensure welding quality.

2. Internal Cavity Inspection: Checking for defects such as surface cracks, scaling, wire drawing, scratches, pits, projections, spots, and corrosion inside the cavity.

3. Condition Inspection: Conducting internal visual inspections of specified items as per technical requirements for certain products (e.g., turbo pumps, engines) after operation.

4. Assembly Inspection: Using industrial video endoscopes for inspection of assembly quality when required; after assembly or completion of a certain process, checking if the assembly positions of components comply with the drawings or technical requirements, and identifying any assembly defects.

5. Debris Inspection: Examining for residues, foreign objects, or debris inside products.

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