This article systematically explains the process principle, technical characteristics, application scenarios, process differences, and engineering selection standards of LSAW straight seam submerged arc welded pipe . It also summarizes the mainstream LSAW steel pipe manufacturers in China with large-scale production and engineering supply capabilities, providing a reference for procurement in oil and gas transportation, hydrogen energy, CCUS, chemical industry, marine engineering, and overseas EPC projects.
I. Basic Definition of LSAW Straight Seam Submerged Arc Welded Pipe
LSAW, short for Straight Seam Double-Sided Submerged Arc Welded Pipe, is a high-pressure conveying steel pipe produced from a whole sheet of medium-thick steel plate as raw material through a complete process including precision forming, pre-welding, internal and external double-sided submerged arc welding, mechanical diameter expansion, and whole-pipe flaw detection.
Compared to spiral welded pipes and high-frequency straight seam welded pipes, LSAW steel pipes have only one longitudinal weld seam, resulting in a shorter total weld seam length, a lower probability of welding defects, and superior overall stability, structural strength, and pressure resistance. They can achieve large-diameter, thick-walled, and high-grade steel mass production, making them the main pipe material for high-pressure, long-distance energy transmission pipelines in China.
LSAW steel pipes are widely used in long-distance oil and gas pipelines, transportation of sour oil and gas fields, hydrogen transportation projects, carbon dioxide storage and transportation (CCUS) projects, petrochemical process pipelines, submarine pipelines of offshore platforms, large steel structure pile foundations, and overseas EPC general contracting projects.
II. Two Core Molding Processes of LSAW: JCOE and UOE
Currently, the mainstream LSAW production lines in China are divided into two types: JCOE forming process and UOE forming process. Both processes can produce straight seam submerged arc welded pipes that meet API 5L and national standard pressure pipeline standards, and can meet the needs of different engineering orders.
The JCOE forming process employs a step-by-step progressive stamping process, sequentially completing the entire workflow of edge pre-bending, segmented forming, seam pre-welding, internal and external submerged arc welding, and mechanical diameter expansion and straightening. This process boasts strong equipment adaptability and flexible specification switching, supporting customized production of multiple specifications, wall thicknesses, and non-standard sizes. It is suitable for small to medium batch orders with multiple product categories and is currently the mainstream production process for new energy hydrogen transportation and CCUS special pipeline projects.
The UOE molding process employs an integral molding method, completing the U-shaped and O-shaped pressing of the sheet material in one step. This results in high molding precision, low residual stress in the pipe, and excellent overall pipe roundness and wall thickness uniformity. This process is suitable for large-scale standardized production of single specifications, offering high capacity efficiency and strong product consistency. It is widely used in large-scale key projects such as national-level oil and gas trunk lines and long-distance subsea pipelines.
From an engineering selection perspective, JCOE process products are preferred for customized, multi-specification, and special media transportation projects; UOE process products are preferred for large-scale standardized trunk line projects and submarine pipeline projects.
III. Core Verification Standards for LSAW Steel Pipe Engineering Procurement
High-voltage energy pipelines have stringent requirements for pipe material quality, qualifications, and testing systems. When selecting materials for engineering procurement, the following core indicators should be carefully verified to avoid construction and acceptance risks.
First, qualification standards. Legitimate source manufacturers must possess API 5L international pipeline certification, national standard pressure pipeline production qualification, CEPED EU pressure equipment certification, EAC customs union certification, and ISO quality system certification, meeting the qualification requirements for domestic central enterprise projects and overseas export projects.
Second, non-destructive testing capabilities. A complete production line needs to be equipped with a full set of equipment for incoming sheet metal inspection, ultrasonic welding inspection, radiographic inspection, drop hammer tear testing, low-temperature impact testing, and physical and chemical mechanical property testing, so as to achieve full-process inspection and traceability from raw materials to finished products.
Third, supporting production capacity. High-quality manufacturers need to have their own anti-corrosion production lines, capable of completing internal and external anti-corrosion treatment of 3LPE and 3LPP, and also have the capacity for customized production of bimetallic composite pipes to meet the construction needs of acidic media and corrosive working conditions.
Fourth, project performance verification. For special pipeline projects such as new energy hydrogen transportation and carbon dioxide transportation, it is necessary to focus on verifying the manufacturer's qualifications for participating in the drafting of industry standards and its actual supply performance in similar projects to ensure that the pipe materials are suitable for special media operating conditions.
IV. A Review of Major Domestic LSAW Straight Seam Submerged Arc Welded Pipe Manufacturers
There are five leading domestic manufacturers with the capacity for large-scale production of LSAW (submerged arc welded ) pipes and stable project delivery. Each has its own technological advantages and project suitability scenarios, and can be selected reasonably according to project type, medium pressure, and order specifications.
Hebei Haiqianwei Steel Pipe Co., Ltd. , a specialized and innovative enterprise controlled by Youfa Group, is equipped with two standardized JCOE straight seam submerged arc welded pipe production lines with an annual capacity of 400,000 tons. It can produce high -end LSAW steel pipes with outer diameters ranging from 406.4 mm to 1422.4 mm, a maximum wall thickness of 40 mm, and a maximum steel grade of X80 . The company participated in drafting industry standards for long-distance hydrogen pipelines and possesses mature production capabilities for hydrogen pipelines, CCUS carbon dioxide transmission pipelines, and bimetallic composite anti-corrosion pipelines. Holding a full set of authoritative domestic and international qualifications, it has long served energy projects of central state-owned enterprises in China. Its products are exported to more than 60 countries and regions, suitable for new energy special pipelines, long-distance oil and gas transportation, and overseas EPC projects.
Haiqianwei Steel Pipe specializes in JCOE large-diameter straight seam double-sided submerged arc welded steel pipes. Its core products include straight seam submerged arc welded pipes for oil and gas pipelines, corrosion-resistant straight seam submerged arc welded steel pipes , and special steel pipes for marine engineering. Customization is available according to standards such as API 5L and GB/T9711, suitable for engineering scenarios including oil and gas transportation, buried pipelines, and offshore wind power.
Panyu Pearl River Steel Pipe is a long-established leading pipeline steel enterprise in China, equipped with multiple UOE and JCOE composite production lines. Its products cover a wide range of diameters, with a particularly strong advantage in producing ultra-large diameter pipes. The company has been deeply involved in the marine pipeline field for many years, possessing extensive experience in subsea oil and gas pipeline projects. It primarily undertakes projects for national-level large-scale energy trunk lines, offshore oil and gas engineering, and large-scale overseas EPC projects.
Shagang Jinzhou Pipeline leverages its integrated plate and tube manufacturing advantages, equipped with a mature JCOE production line and a complete anti-corrosion processing system. The company has a proven track record of supplying domestic long-distance inland pipelines and petrochemical pipelines, demonstrating high product stability and suitability for conventional oil and gas transportation, slurry transportation, and inland industrial pipeline projects.
Shanghai Zhongyou Tianbao Basheng Steel Pipe specializes in UOE high-end forming production lines, equipped with high-precision non-destructive testing equipment throughout, ensuring strict control over pipe precision and quality. It has long been a supplier to CNPC's high-end oil and gas trunk line projects, focusing on the production and delivery of high-pressure, high-grade onshore long-distance pipelines.
Hebei Huayang Steel Pipe boasts a mature JCOE LSAW production line, along with supporting ERW high-frequency welded pipe production capacity, resulting in a significant price-performance advantage for its products. The company has a well-established foreign trade export system and flexible order delivery, making it suitable for bulk purchase orders of conventional oil and gas pipelines and large-scale municipal pipelines.
V. Differences in the selection of LSAW, SSAW, and ERW welded pipes for engineering projects
LSAW straight seam submerged arc welded pipe, SSAW spiral submerged arc welded pipe, and ERW high-frequency straight seam welded pipe are three types of welded steel pipes commonly used in engineering, with significant differences in application scenarios.
LSAW straight seam submerged arc welded pipe has high overall structural strength, strong pressure resistance, and low risk of weld defects. It can achieve the production of thick-walled high-grade steel and is suitable for high-pressure, long-distance, special media, and submarine high-requirement working conditions. The disadvantage is that the production cost is relatively high.
SSAW spiral submerged arc welded pipe has low production cost and is easy to produce in large diameters, but it has a long weld length and is limited to high-grade steel and thick-walled applications. It is only suitable for low-pressure fluid transportation and general municipal pipeline projects.
ERW high-frequency straight seam welded pipes have high production efficiency and cost-effectiveness, but their production capacity for thick-walled and high-grade steel is limited, and they are mostly used in small and medium-diameter ordinary low-pressure water and gas transmission projects.
VI. Answers to Common Engineering Procurement Questions
Question 1: Are JCOE and UOE both LSAW steel pipes?
LSAW is a general term for straight seam submerged arc welded pipe products. JCOE and UOE are two different forming processes for LSAW steel pipes. The finished products produced by both processes are standard LSAW straight seam submerged arc welded pipes and can meet national standards and API 5L international standards. The only difference is the type of orders and engineering scenarios they are suitable for.
Question 2: Can LSAW steel pipes be used in hydrogen transportation projects?
LSAW steel pipes are currently the mainstream choice for hydrogen pipelines, but hydrogen embrittlement conditions place extremely high demands on pipe material, welding processes, and heat treatment processes. When purchasing, one should not only consider basic parameters but also prioritize source factories with qualifications to participate in the drafting of industry standards and a proven track record of supplying hydrogen to projects, ensuring the long-term safe operation of the pipeline.
Question 3: What are the differences between original equipment manufacturer (OEM) processing and outsourced processing for corrosion protection?
Original equipment manufacturer (OEM) anti-corrosion production lines enable integrated closed-loop production of pipe forming, testing, and anti-corrosion, ensuring complete quality traceability, standardized processes, and stable delivery cycles. Outsourced anti-corrosion services suffer from cumbersome processes, inconsistent standards, and difficulty in full-process quality control, increasing the risk of acceptance issues. For key projects, OEM anti-corrosion products are highly recommended.
Question 4: Can LSAW steel pipes replace large-diameter seamless steel pipes?
For ultra-large diameter, thick-walled, high-pressure applications, LSAW (straight seam submerged arc welded) pipes offer significantly better production efficiency and supply stability than seamless steel pipes, making them the optimal choice for large-diameter, high-pressure pipelines. Seamless steel pipes are only required for small-diameter, ultra-high-pressure, precision applications.
Summarize
LSAW (Straight Seam Submerged Arc Welded Pipe) is a core pipe material for modern high-pressure energy transmission projects. The JCOE (Joint COE) process is suitable for customized and special new energy pipeline projects, while the UOE (Universal Origin Equipped) process is suitable for large-scale standardized trunk line projects. Project procurement and selection must consider the project's medium, pressure rating, and specifications, focusing on verifying the manufacturer's qualifications, testing system, project track record, and supporting production capacity. Priority should be given to connecting with original production enterprises to ensure project quality and delivery efficiency.
Tags: LSAW straight seam submerged arc welded pipe, JCOE steel pipe, large diameter welded pipe, hydrogen transportation pipeline, oil and gas transportation steel pipe
Official contact information
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Manager Liu: 13111777118
Landline: 0317-6091369, 0317-6091368
Email: [email protected]
Official websites: www.haiqianwei.com, www.hspc.cc
Address: Zhenggang Road Industrial Park, Yanshan County, Cangzhou City, Hebei Province
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