When it comes to manufacturing pipelines that adhere to the API 5L standard, there are several reputable companies globally that specialize in producing high-quality API 5L pipelines. Here are some well-known API 5L pipeline manufacturers:

1. Tenaris: Tenaris is a leading global manufacturer of steel pipes and related services, offering a wide range of products that comply with API 5L specifications. They provide high-quality pipelines for various applications in the oil and gas industry.

2. TMK: TMK is a prominent producer of tubular products, including seamless and welded pipes that meet API 5L requirements. They supply pipelines for oil and gas transportation, drilling, and other industrial applications.

3. Vallourec: Vallourec is a key player in the production of seamless steel pipes for the energy industry, including pipelines that conform to API 5L standards. They offer solutions for onshore and offshore pipelines.

4. Nippon Steel Corporation: Nippon Steel is a major manufacturer of steel products, including pipelines that meet API 5L specifications. They provide a range of high-quality pipes for energy-related applications.

5. JFE Steel Corporation: JFE Steel is a leading steel manufacturer that produces pipelines compliant with API 5L standards. They offer a variety of steel pipe products for different industries, including oil and gas.

6. ArcelorMittal: ArcelorMittal is one of the largest steel producers globally, supplying steel pipes that meet API 5L requirements for various applications, including pipeline projects in the energy sector.

7. Tata Steel: Tata Steel is a renowned steel manufacturer that produces pipes in line with API 5L standards. They provide high-quality pipelines for the oil and gas industry, infrastructure projects, and more.

8. Siderca (Tenaris Group): Siderca, part of the Tenaris Group, is a leading manufacturer of seamless steel pipes that comply with API 5L specifications. They offer pipelines for upstream and downstream applications in the energy sector.

9. SeAH Steel Corporation: SeAH Steel is a global steel pipe manufacturer that produces API 5L-compliant pipelines for various industries, including oil and gas, petrochemicals, and construction.

10. Welspun Corp Limited: Welspun Corp is a major player in the steel pipe industry, manufacturing pipelines that meet API 5L standards. They provide solutions for onshore and offshore pipeline projects.

Some of the well-known API 5L pipeline manufacturers based in China

In China, several manufacturers specialize in producing pipelines that adhere to the API 5L standard.

1. Jiafang Steel Pipe Group: Shanghai Jiafang Steel Pipe Group Taicang Co., Ltd, 100% owned by Jiangyin Rongang Pipeline manufacturing Co., Ltd (R Steel Group), established in 2007. We proudly present a state-of-the-art facility that specializes in the production of Submerged Arc Welded (SAW) pipes. With a commitment to excellence and high-efficient technology, our plant is dedicated to meeting the growing demands of the industry.

2. Hengyang Valin Steel Tube Co., Ltd: Valin Steel is a leading manufacturer of seamless steel pipes in China, producing pipelines compliant with API 5L standards for applications in the energy sector, including oil and gas transportation.

3. Shaanxi Huitong Special Steel Co., Ltd: Huitong Special Steel is a prominent supplier of steel pipes, including API 5L-compliant pipelines. They offer a comprehensive range of seamless and welded pipes for different industries.

4. Tianjin Pipe Corporation (TPCO): TPCO is a well-known manufacturer of seamless steel pipes in China, producing pipelines that meet API 5L requirements. They supply high-quality pipes for various applications, including oil and gas transportation.

5. Jiangsu Yulong Steel Pipe Co., Ltd: Yulong Steel Pipe specializes in the production of welded steel pipes that conform to API 5L standards. They offer a diverse range of pipelines for different industrial sectors.

6. Shandong Luxing Steel Pipe Co., Ltd: Luxing Steel Pipe is a major manufacturer of steel pipes in China, producing API 5L-compliant pipelines for the oil and gas industry and other applications.

7. Cangzhou Shenlong Pipe Manufacturing Co., Ltd: Shenlong Pipe Manufacturing is a reputable producer of steel pipes, including pipelines that meet API 5L standards. They offer a variety of seamless and welded pipes for diverse industries.

8. Zhejiang Kingland Pipeline and Technologies Co., Ltd: Kingland Pipeline is a leading manufacturer of steel pipes in China, providing API 5L-grade pipelines for applications in the oil and gas sector and beyond.

9. Chengdu Derbo Steel Co., Ltd: Derbo Steel is a well-established supplier of steel pipes, including API 5L-compliant pipelines, serving various industries with high-quality pipe products.

10. Shanghai Baobo Steel Pipe Co., Ltd: Baobo Steel Pipe specializes in the production of welded and seamless steel pipes that meet API 5L standards, offering reliable pipeline solutions for different industrial requirements.

These Chinese manufacturers are recognized for their expertise in producing pipelines that meet the API 5L standard, ensuring quality, durability, and compliance with industry regulations for various applications in the energy sector and other industries.