10inch 20inch H2S Resistant LSAW Steel Line Pipes API 5L X46N PLS2 NACE TM 0284 With 3LPE Coated
API 5L X46 PSL2 H2S Resistant LSAW (Longitudinal Submerged Arc Welded) Steel Pipe is a high-grade line pipe specially engineered for sour oil and gas field service. Manufactured in strict accordance with API 5L 45th edition standard, this pipe features strict low-sulfur and low-phosphorus chemical composition, excellent hydrogen-induced cracking (HIC) resistance and sulfide stress cracking (SSC) resistance, fully adapting to harsh corrosive working environments containing hydrogen sulfide
Pipe external surface is equipped with premium 3LPE (3-Layer Polyethylene) anti-corrosion coating, which provides superior long-term anti-corrosion performance against soil corrosion, seawater erosion and atmospheric oxidation,which is widely used for onshore and offshore oil & gas transmission pipelines.
PIPE MANUFACTURING PROCESS (LSAW)
The pipe shall be manufactured from plates by cold forming usingUOE or JCOE processand
shall have one longitudinal seam made by the automatic Submerged Arc Welding process.
longitudinal weld seam shall include at least one pass made on the inside and at least one pass made
on the outside.
Complete Technical Parameters
1. Basic Standard & Grade
Executive Standard: API 5L 45th Edition
Steel Grade: X46
Specification Level: PSL2
Service Type: Sour Service (H2S Resistant)
Manufacturing Process: LSAW (Longitudinal Submerged Arc Welding)
Anti-corrosion Type: External 3LPE Coating
2 Mechanical Properties
Item | Standard Value | Test Requirement |
|---|---|---|
Minimum Yield Strength | 317MPa (46ksi) | Meet API 5L X46 standard |
Tensile Strength | 434-655MPa | Uniform and stable performance |
Elongation | ≥ 18% | Qualified for pipeline bending and deformation resistance |
Charpy V-Notch Impact Energy | ≥ 27J (-10 ℃) | Mandatory full-temperature impact test for PSL2 |
Anti-cracking Performance | HIC & SSC Resistant | Pass sour service professional testing |
3 Chemical Composition (Max, %)
C | Si | Mn | P | S | Ni | Cr |
|---|---|---|---|---|---|---|
0.26 | 0.40 | 1.40 | 0.020 | 0.003 | 0.30 | 0.30 |
TESTS
1. Tests for Plates:
The steel plate to be used for pipe manufacturing shall be ultrasonically inspected to meet
minimum required coverage of plate width to identify non-visual defects, mechanical damage
and laminar defects in the pipe body.
2 Pipe Tests
During production three (3) types of tests are to be performed in accordance with API Spec 5L.
A. Non-destructive Testing
The BIDDER/SUPPLIER shall carry out the following tests on each finished pipe and record
the results in the pipe report for approval by MOGE inspection team.
A.1 Visual inspection
A.2 Hydrostatic tests
A.3 Ultrasonic test methods
A.3.1 Ultrasonic inspection for longitudinal imperfections in seam welds
The full length of the weld seams of SAW pipe shall be ultrasonically inspected for
detection of longitudinal and transverse imperfections in accordance with ISO 9765:1990
acceptance level L2, the inspected methods as per API 5L.
A.3.2 Laminar imperfections in the pipe body and on the strip/plate edges
The pipe or stripe/plate body shall be ultrasonically inspected for the detection of laminar imperfections in accordance with API 5L and Non-destructive inspection of the weld seam at the pipe ends as per API Spec 5L.
A.4 Acceptance tests and inspection
The following tests and inspections shall be carried out:
(a) Pipe dimensions
(B) Dimensional tolerance
B. Destructive Testing
The appointed inspector of the MOGE/ MOGE inspection team reserves the right to select the pipe to be tested from the entire lot. A lot consist of the number of pipes as defined in the API
Spec 5L.9
The test pipes shall be tested and inspected as defined in the API Spec 5L.
B .1 Tensile tests - Base material (plates)
Tensile properties shall be determined from two specimens removed from the base material in
transverse direction per heat and one piece every lot. Yield strength, tensile strength and elongation shall be tested.
B .2 Tensile tests - Welding seam
Weld tensile strength of one specimen shall be taken transverse to the welding seam and shall be tested per heat and one piece every lot.
B .3 Guided - Bend test - Welding seam
The test specimen shall be taken from the seam weld in a length of pipe from each lot of fifty
(50) lengths or less of each combination of specified outside diameter, specified wall thickness
and grade.
B .4 Charpy impact test for base material and welding seam
Three notch impact specimens shall be taken from the base material and the same number from the welding seams.
B .5 Chemical analysis
A ladle analysis per steel charge and check analysis are to be performed on one (1) pipe out
each steel charge.
B .6 Including hardness test as per API 5L.
C. Retesting of Mechanical Properties
Retesting shall be performed for each mechanical test failure in accordance with the section 10.2.12 of API Spec 5L.
HIC Test:
HIC test shall be carried out before production of pipes (Raw Material) in a medium complying with NACE TM 0284 in accordance with the requirements specified in section H.4.3 of Annex H, API Spec 5L.
The test procedure shall be covered by an inspection and test plan approved by MOGE. The inspection and test plan shall be cross referred to the procedure test documents and applicable standards.
The test for resistance to HIC shall meet the following acceptance criteria, with each ratio being
the maximum permissible average for three sections per test specimen when tested in solution A.
(a) Crack Sensitivity ratio (CSR)≤ 2%
(B) Crack Length ratio (CLR)≤ 15%
(c) Crack Thickness ratio (CTR)≤5%
Dimensional Tolerances
1. Dimensional Tolerances for outside Diameter of the pipe
Specified outside Diameter (D), mm(in) > 168.3(6.625) to 610 (24.000)
The outside diameter of the pipe body + 0.75%, - 0.25%
Out of Roundness - at pipe end +/-1%
Wall thickness +10 %, - 5 % of wall thickness
2. Tolerances for Bulges, Dents and Flat Areas
Deviations from the original contour of the pipe shall not exceed the limits given in the paragraph 9.10.5 of API Spec 5L.
3. Tolerances on Length
12 m ± 0.2 m with a minimum average of 12.0 m, No Pipes shall be shorter than 11.8 m. No Jointer shall be allowed for any line pipe.
4. Tolerances of Straightness
The tolerances of straightness shall comply with the paragraph 9.11.3.4 of API Spec 5L
3PE Quality Index on Buried Steel Pipeline
| DIN 30670; 2012-04 Polyethylene Coating formed by pipe | ||||
Coating | DN(mm) | FBE powder | Adhesive (µm) | Coating minimum thickness(mm) | |
250 | ≥ 60 | ≥ 140 | 3.5mm ± 0.5mm | ||
FBE Powder | Category | Performance Index | |||
Particle size (%) | Oversize powder(150 µm) ≤3.0 | ||||
Volatile (%) | ≤ 0.6 | ||||
Gel time (200 °C) (s) | ≥ 12 | ||||
Curing time (200 °C) (min) | ≤ 3 | ||||
Fusion-bonded | Adhesion (grade) | ≤ 2 | |||
Cathodic Disbondment (23°C/28d , 60°C/2d) | ≤ 7 | ||||
Adhesive | Density (g/cm3) | 0.92-0.95 | |||
Melt flowrate 190°C, 2.16kg (g/10min) | ≥ 0.7 | ||||
Vicat softening temperature (°C) | ≥ 90 | ||||
Glass transition temperature (°C) | ≤ -50 | ||||
Polyethylene | Density (g/cm3) | 0.94-0.96 | |||
Melt flowrate 190°C, 2.16kg (g/10min) | ≥ 0.15 | ||||
Carbon black (%) | ≥ 2.0 | ||||
Heat Aging | ΔMFR + 35% | ||||
Polyethylene | Elongation at Break (%) | ≥ 400 | |||
Indentation | S (Type S) | 23°C | ≤ 0.2 | ||
70°C | ≤ 0.4 | ||||
Unit coating resistance (23°C+ 2°C) | ≥ 108 m2 | ||||
UV aging resistance | ΔMFR + 35% | ||||
Anticorrosive | Peel strength | 23°C | (Type N) | (Type S) | |
100 | 150 | ||||
N 50°C, S 70°C | 20 | 30 | |||
Cathodic disbondment (mm) | (23°C/28d or 60°C/2d) ≤ 7mm | ||||
(23°C+ 2°C) Impact resistance (J/mm) | ≥ 5 | ≥ 7 | |||
Low-temp impact strength (-20°C+ 2°C) (J/mm) | (-20°C +2°C) ≥ 5 | (-40°C +2°C) ≥ 7 | |||
FAQ
Q1: What is the difference between API 5L X46 PSL2 and PSL1 pipes?
A1: PSL2 is a higher product specification level than PSL1. It requires stricter chemical component control (lower sulfur and phosphorus content), mandatory full-temperature impact test, more rigorous nondestructive testing and dimensional tolerance standards. PSL2 pipes have better toughness, corrosion resistance and operational safety, which is essential for sour service and high-pressure oil & gas transmission projects, while PSL1 is only suitable for conventional low-risk working conditions.
Q2: What does H2S resistant/sour service mean for this pipe?
A2: This pipe is specially designed for pipeline systems containing hydrogen sulfide gas. Through ultra-low impurity chemical formula and professional heat treatment process, it can effectively resist hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC), avoiding pipeline leakage and rupture failures caused by H2S corrosion, and is suitable for sour oil and gas field development and transmission projects.
Q3: What are the advantages of 3LPE anti-corrosion coating?
A3: 3LPE is the most mainstream high-grade anti-corrosion process for oil and gas pipelines. The three-layer composite structure has ultra-high bonding force and insulation performance, effectively isolating soil, moisture and corrosive media. It features wear resistance, impact resistance, anti-aging and long service life, which can greatly reduce pipeline maintenance costs and extend the overall service life of the pipeline system.
Q4: Do you support fixed specifications for export to Myanmar?
A4: Yes. We have stable inventory and production capacity for 10-inch and 20-inch API 5L X46 PSL2 H2S resistant LSAW pipes, which are the most commonly used specifications for Myanmar oil and gas pipeline projects. We support FOB, CIF and other trade terms, provide standard export wooden pallet packaging and complete customs clearance documents, and have mature logistics channels for Myanmar.
Q5: What quality certificates can you provide?
A5: We can provide API 5L certification, factory material test certificate (MTC), HIC/SSC anti-sulfur corrosion test report, 3LPE coating inspection report, mechanical property test report and full set of export certification documents to meet Myanmar local customs clearance and project bidding acceptance requirements.
Q6: Can you customize wall thickness, length and coating parameters?
A6: Yes. On the basis of standard 10-inch and 20-inch specifications, we can customize pipe wall thickness, single pipe length, coating thickness and other parameters according to customer project requirements, and provide personalized processing and anti-corrosion solutions.
