LSAW Pipe

Why Choose Tianjin Baolai Steel Industry Group Co.,Ltd

Tianjin Baolai Steel Industry Group Co., Ltd is a comprehensive company, which focuses on steel pipes and other steel products. Established in 1991, Baolai is among the first few specialized companies that develop and manufacture ordinary and special-diameter steel pipes. We manufacture API, ASTM, BS, DIN, JIS, and EN standards pipes with a galvanizing facility. Our annual capacity is approximately 4800,000MT in various specifications and export 150,000MT to all over the world.

Rich Experience

We are the leading steel pipes manufacturer, having established since 1991 with more than 30 years of experience.

Wide Product Range

We develop and manufacture ordinary and special-diameter steel pipes, API, ASTM, BS, DIN, JIS, and EN standards pipes, having eight steel pipe production lines and five hot-dipped galvanizing production lines.

Professional Technical Team

A dedicated team is tasked to provide technical support to advise the proper usage of steel and assist customers in using the products to their best advantage.

Complete Qualifications

Our company has two integration management system evaluation certificates, China's top 500 manufacturing industries, ISO 45001, ISO 14001, and ISO 9001. Our products have API 5CT -0802, EN 10217 Directive 2014/68/EU, EN 10217 material according to DGRL 97/23/EC, Quality-Management-System, Quality-Assurance, LR 3, LR 2, LR 1, UL ASTM A852, UL ASTM A53/ ASTM, API 5L-0552 certifications.

LSAW steel pipe (Longitudinally Submerged Arc Welding abbreviated as LSAW) is a professional expression term for straight seam submerged arc welded steel pipe.LSAW pipes are widely used for transmission of oil and gas (both onshore and offshore), petrochemical, mining, coal chemical industry city, ocean engineering, infrastructure construction, gas, water, etc.

What Is LSAW Pipe?

Longitudinally Submerged Arc Welding pipe (abbreviated as LSAW pipe). The Longitudinally Submerged Arc Welding (LSAW) uses a single plate as raw material, presses (rolls) the steel plate into a tube blank in a mold or forming machine, and uses double-sided submerged arc welding to expand the diameter. The finished product has complete specifications, and the weld has good toughness, plasticity, uniformity and density. It has the advantages of large pipe diameter, thick pipe wall, high-pressure resistance, low-temperature resistance, corrosion resistance and other advantages.

When constructing high-strength, high-toughness, and high-quality long-distance oil and gas pipelines, most of the steel pipes required are large-diameter, thick-walled straight seam submerged arc welded pipes. According to API standards, among large oil and gas pipelines, longitudinal submerged arc welded pipes are the only specified pipe type when passing through Class I and Class II areas such as high altitude areas, seabed, and densely populated urban areas.

Features of LSAW Pipe

The steel pipe has longitudinal welds, and the internal and external welds are welded by submerged arc welding.

After the overall mechanical diameter expansion treatment, the internal stress of the steel pipe is small and evenly distributed, which can effectively prevent stress corrosion cracking, has high dimensional accuracy and facilitates on-site welding construction.

Adopting the weld first and then the weld process, the welding process is stable and the weld quality is high.

Welds are easy to implement with non-destructive testing during production and on-site non-destructive testing during use.

The range of product specifications is wide, and it can produce not only small-diameter and large wall thicknesses, but also large diameter and large wall thickness steel pipes.

The Comparison Between Lsaw Pipe and Ssaw Pipe

LSAW and SSAW are variations of SAW (submerged arc welded) pipe. The difference between them is the welding method. In longitudinal seam submerged arc welded pipe, the welding is longitudinal, which means that the steel (hot-rolled coil) is rolled into a pipe and the weld is then welded longitudinally. In the SSAW type, steel coils are spirally welded, like a spiral, so that the coil (strip) takes on the shape of a tube. SAW pipes are mainly used for oil and gas transportation. Seamless (non-welded) pipes, on the other hand, are primarily used in oil and gas exploration projects.

LSAW tubes ("submerged arc welded") are manufactured by cutting, bending and welding steel plates (JCOE process). The two main types of LSAW pipe are longitudinal (with single or double straight seam welds, DSAW) and spiral (called HSAW, SSAW or SAWL pipe).

Spiral steel pipes (SSAW pipes) and straight seam steel pipes are currently widely used in water supply pipelines, construction and other industries, but there are big differences between the two.

Different Pressure-Bearing Capabilities

The strength of spiral steel pipes is generally higher than that of straight seam steel pipes. The main production process is submerged arc welding. Spiral steel pipes can use billets of the same width to produce steel pipes of different diameters, or use narrower billets to produce steel pipes of larger diameters.

Different Specifications

The specifications of spiral steel pipes are generally above 219mm, and most of them are large diameter. The specifications of straight seam steel pipes are mostly small diameters, but some manufacturers also have many large diameters.

Different Prices

Spiral steel pipes are mostly settled through measuring tapes, and straight-seam steel pipe prices are mostly settled through weighing. However, the price of spiral steel pipes is about 300 yuan/ton cheaper than straight-seam steel pipes.

Benefits of LSAW Pipe

High Strength and Durability

One key advantage lies in their high strength and durability, attributed to the longitudinal welding process that forms a robust seam along the length of the pipe. This characteristic makes LSAW pipes well-suited for applications requiring resistance to external pressures and environmental stresses. Additionally, the manufacturing process allows for the production of pipes with large diameters, making them suitable for transporting substantial volumes of fluids and gases over long distances.

Size Flexibility

LSAW pipes are also recognized for their dimensional accuracy and uniformity, ensuring a reliable and consistent performance in various industrial settings. The versatility of these pipes is evident in their adaptability to different coating and lining materials, enhancing corrosion resistance and extending their service life.

Ease of Installation

Furthermore, the straight seam configuration of LSAW pipes simplifies the installation process, contributing to cost-effectiveness and efficiency in construction projects.

Application of LSAW Pipe

Energy Sector

One primary application lies in the transportation of liquids and gases, where the strength and durability of LSAW pipes are crucial for ensuring the safe and efficient movement of substances over long distances. These pipes are commonly employed in the oil and gas industry, serving as key components in the infrastructure for the transmission of crude oil, natural gas, and other hydrocarbons.

Water Industry

In addition to the energy sector, LSAW pipes play a vital role in the water industry, facilitating the conveyance of potable water, wastewater, and irrigation systems. Their resistance to corrosion and ability to withstand external pressures make them well-suited for underground and underwater applications.

Construction Industry

The construction industry also benefits from the use of LSAW pipes, especially in projects involving piling, structural support, and foundation works. The versatility of these pipes extends to various engineering applications, including the conveyance of chemicals and abrasive materials, further highlighting their adaptability across different industrial contexts.

How to Choose LSAW Pipe

Diameter

When selecting an LSAW pipe for your project, the diameter of the pipe must be taken into account as it determines vital factors such as flow rate, pressure, and fluid passage. To ensure optimal performance of the pipeline system, appropriate diameter selection is paramount. Choosing the appropriate thickness of a pipe's wall is paramount in ensuring its strength and durability. To guarantee that your pipe can withstand your project's pressure and stress, it is essential to make this selection with due diligence.

Production Standards

Opting for an LSAW (Longitudinal Submerged Arc Welded) pipe entails considering various factors including production standards.

For instance, adhering to intemational standards like API 5L or ASTM becomes crucial when selecting a qulity-assured product that aligns with your project's specifications ensuring.

Compliance and Dependabilit

The choice of LSAW pipe for a project can significantly impact costs and ultimately determine the feasibility of the endeavor. Selecting an affordable and suitable option for your specific demands becomes all the more significant under these circumstances. It is important to weigh critical aspects such as wall thicknesses, diameters, materials used during production as well as any related adjustments around them before settling on a specific option.

LSAW pipe manufacturing process

ASTM A106 Seamless Fire Protection Pipes

The LSAW large diameter steel pipe manufacturing process is explained in the steps below,

Plate Probe

This is used for manufacturing the large diameter LSAW joints right after it enters the production line which is the initial full-board ultrasonic testing.

Milling

The machine used for milling does this operation through two-edged milling plate to meet the requirements of the plate width and the sides parallel to the shape and degree.

Pre-Curved Side

This side is achieved by using a pre-bending machine on the pre-bending plate edge. The plate edge needs to meet curvature requirement.

Forming

After the pre-bending step, in the first half of the JCO molding machine, after stamped steel, it is pressed into a “J” shape while the on the other half of the same steel plate it is bent and pressed into a “C” shape, then the final opening forms an “O” shape.

Pre-welding

This is to make a welded pipe steel a straight seam after it has been formed and then use gas welding seam (MAG) for continuous welding.

Inside Weld

This is done with a tandem multi-wire submerged arc welding (about four wire) on the inner part of the straight seam welded steel pipe.

Outside Weld

Outside weld is the tandem multi-wire submerged arc welding on the outer part of the LSAW steel pipe welding.

Ultrasonic Testing

Outside and inside of the straight seam welded steel pipe and both sides of the base material are welded with 100% inspection.

X-ray Inspection

X-ray industrial TV inspection is carried out on the inside and outside using image processing system to make sure there is detection sensitivity.

Expansion

This is for accomplishing submerged arc welding and straight seam steel pipe length hole diameter so as to improve the steel tube’s size precision and improve the distribution of stress in the steel tube.

Hydraulic Test

This is carried out on the hydraulic test machine for steel after expanding by-root test for ensuring the steel pipe meets the standard requirements with the machine having an automatic recording and storage capabilities.

Chamfering

This involves the inspection carried out on the steel pipe at the end of the whole process.

Our Factory

We have a complete factory production, quality supervision and delivery.

Our Certificate

At present, the company has ISO9001, ISO14001, ISO45001, Evaluation certificate of the integration of industrialization and industrialization management system, China's Top 500 Manufacturing Private Enterprises certifications.

Ultimate FAQ Guide to Firefighting Steel Pipe

Q: What is LSAW Pipe?

A: LSAW (Longitudinally Submerged Arc Welded) Pipe is made by using a method in which a sheet of steel is rolled into a cylindrical shape and then welded longitudinally using submerged arc welding.

Q: What are the advantages of using LSAW Pipe?

A: Without unwind process, the base material indentation, scratch less.

The wrong side of the slit, the diameter perimeter of easy control and excellent welding quality.

Elimination of the pipe expansion substantially no residual stress after stress.

Because it is a straight line weld, the weld is short, so a small probability of occurrence of defects.

After expanding, pipe geometry accuracy is improved greatly facilitates the site welding.

A straight line weld, less impact on the quality of anti-corrosion coating material.

Q: What is the usage of LSAW Pipe?

A: The basic metal and welding metal have been tested according to the specification of the pipe API SPEC 5L, DIN, EN, ASTM, GOST standard and other standards. Also, LSAW pipe can be welded with flanges, lifting eyes and other parts depending on client’ requirements. LSAW pipe are used for conveying fluids like oil, gas and water transportation as well as used for seashore projects and ground constructions. These products are manufactured in China and are exported to other countries like United States of America, Canada, India, Pakistan, Africa, etc.

Q: What are the different types of LSAW pipes?

A: The two main types of LSAW pipes are longitudinal and spiral. Longitudinal pipes have a straight seam, while spiral pipes have a helical seam.

Q: What is the weight of LSAW pipes?

A: The weight of LSAW pipes depends on the diameter and thickness, but can range from a few hundred to several thousand kilograms.

Q: How are LSAW pipes tested for quality assurance?

A: LSAW pipes are tested for quality through various methods, including ultrasonic testing, radiographic testing, and hydrostatic testing.

Q: What are the limitations of LSAW pipes?

A: LSAW pipes can be more expensive than other types of pipes, and may not be suitable for all applications due to their size and weight.

Q: How are LSAW pipes transported?

A: LSAW pipes are often transported by truck or rail, and may be shipped over long distances by sea.

Q: What is the lifespan of LSAW pipes?

A: The lifespan of LSAW pipes depends on several factors, including the quality of the materials used, the condition of the environment, and the maintenance practices of the user.

Q: Can LSAW pipes be used underground?

A: Yes, LSAW pipes can be used underground, but proper care must be taken to ensure that they are protected from corrosion.

Q: Do LSAW pipes require any special handling during installation?

A: Yes, LSAW pipes require special care during installation to prevent damage to the surface and seams.

Q: Can LSAW pipes be recycled?

A: Yes, LSAW pipes are made of steel and can be recycled. LSAW pipes made from recycled materials, contributing to the market's sustainability efforts.

Q: Can LSAW pipes be customized to fit specific requirements?

A: Yes, LSAW pipes can be customized to fit specific requirements, such as diameter, thickness, and length. LSAW pipes can be tailored to meet specific requirements, making them an ideal choice.

Q: What are the benefits of using LSAW pipes in the oil and gas industry?

A: LSAW pipes offer high strength and durability, making them ideal for use in the oil and gas industry where the pipes must withstand high pressure and harsh environmental conditions.

Q: How are LSAW pipes made?

A: LSAW pipes are made by rolling a sheet of steel into a cylindrical shape and welding it longitudinally using submerged arc welding.

Q: Can LSAW pipes be used in the construction industry?

A: Yes, LSAW pipes can be used in the construction industry for applications such as bridges, buildings, and tunnels.

Q: What are the advantages of using LSAW pipes in the construction industry?

A: LSAW pipes offer high strength, durability, and resistance to corrosion, making them ideal for use in the construction industry. LSAW pipes are employed in construction projects, especially for piling welded steel pipe and foundation works. Their strength and durability make them suitable for supporting structures in various applications.

Q: What is the difference between LSAW and SSAW pipes?

A: The main difference between LSAW and SSAW (Spirally Submerged Arc Welded) pipes is the seam, with LSAW pipes having a straight seam and SSAW pipes having a helical seam.

The difference is SSAW pipes are welded in the helix or spiral position while LSAW pipes are welded in the longitudinal direction. Manufacturing process of SSAW pipe is by rolling and welding a steel strip in a way that the pivotal direction is oblique to the axis or pipe center, making the weld seam in a spiral line.

Q: What are the common uses of LSAW pipes?

A: LSAW pipes are commonly used in the oil and gas industry, transportation of water and sewage, construction, and other industrial applications.

Oil and Gas Industry: LSAW pipes are extensively used for the transportation of oil and natural gas, both onshore and offshore. Their large diameter capability and strength make them a preferred choice for energy infrastructure projects.

Water Supply Systems: Municipal water supply systems often utilize LSAW pipes for their reliability and efficiency in transporting large volumes of water over considerable distances.

Q: What is the diameter of LSAW steel pipe?

A: 16inch to 60inch

LSAW pipes are produced by molding steel sheets to a cylinder and joining the ends together by welding in a straight line. The LSAW pipe diameter range is normally from 16inch to 60inch (406mm to 1500mm).