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Pipes are cylindrical hollow structures used for transporting fluids, gases, and sometimes solids, across a wide range of industries, including oil and gas, construction, water treatment, chemical processing, and power generation. Typically manufactured from materials such as steel, stainless steel, copper, plastic, or composite materials, pipes are designed to withstand varying levels of pressure, temperature, and environmental conditions. The choice of pipe material and specification depends on the application, with factors like corrosion resistance, strength, and flexibility being critical considerations.




Steel pipes, for instance, are commonly used in high-pressure applications like gas pipelines and structural frameworks due to their durability and strength. Stainless steel pipes offer superior resistance to corrosion and are preferred in industries handling corrosive fluids, such as chemical processing plants. Plastic pipes, including PVC and HDPE, are popular for low-pressure applications such as water distribution and drainage systems due to their lightweight and cost-effectiveness.




Pipes come in various sizes and schedules, which refer to the thickness and diameter of the pipe, affecting its flow capacity and pressure rating. Seamless pipes, made without a weld seam, are often used in applications requiring high strength and reliability, whereas welded pipes are suitable for more general-purpose uses. Pipes play a critical role in infrastructure, enabling the efficient and safe transportation of materials over long distances and within industrial facilities, contributing to the operational efficiency and safety of systems they are integrated into.




Pipe Sizes:
1) Nominal Pipe Size (NPS) or Diameter Nominal (DN): Standardized system used to specify the diameter of pipes.
★ NPS: In inches, typically ranging from 1/8" to 48".
★ DN: Metric system, usually expressed in millimeters.

2) Wall Thickness: Defined by the pipe schedule (SCH).
★ Common schedules: SCH 10, 20, 40, 80, 160, and XXS (extra extra strong).
★ The higher the schedule number, the thicker the pipe.

3) Standard Pipe Length:
★ Single Random Length (SRL): Typically 5-7 meters.
★ Double Random Length (DRL): Usually 11-13 meters.
★Custom lengths: Available for specific applications.




Grade Material Diameter Range (mm) Wall Thickness (mm) Standards Tensile Strength (MPa) Yield Strength (MPa) Applications
ASTM A106 Gr. B Carbon Steel 21.3 - 457.2 2.77 - 22.2 ASTM A106, ASME B36.10M 415 240 High-temperature service, boilers, piping
ASTM A333 Gr. 6 Low-Temperature CS 10.3 - 914.4 1.24 - 25.4 ASTM A333 415 240 Low-temperature pipelines, cryogenic systems
ASTM A312 TP304 Stainless Steel 304 6 - 762 0.5 - 40 ASTM A312, ASME B36.19M 515 205 Chemical processing, food industries
ASTM A312 TP316 Stainless Steel 316 6 - 762 0.5 - 40 ASTM A312, ASME B36.19M 515 205 Corrosive environments, oil and gas
API 5L Gr. B Carbon Steel 21.3 - 1219 2.11 - 32.0 API 5L 414 241 Oil and gas pipelines, transportation of fluids
ASTM A53 Gr. B Carbon Steel 10.3 - 660.4 1.8 - 22.2 ASTM A53, ASME B36.10M 415 240 Water distribution, structural applications
ASTM A335 P11 Alloy Steel 12.7 - 762 1.65 - 100 ASTM A335 415 - 585 205 High-pressure, high-temperature applications
ASTM A335 P22 Alloy Steel 12.7 - 762 1.65 - 100 ASTM A335 415 - 585 205 Power plants, pressure vessels, steam services
API 5CT J55 Carbon Steel 60.3 - 508 4.24 - 16.13 API 5CT 517 379 Oil well casing, drilling, tubular goods
API 5L X42 High-Strength CS 21.3 - 1219 2.11 - 32.0 API 5L 414 290 Oil and gas pipelines, long-distance transport
DIN 2391 ST35 Carbon Steel 4 - 120 0.5 - 12.5 DIN 2391 470 355 Automotive, hydraulic piping
ASTM A179 Low-Carbon Steel 10.3 - 114.3 1.2 - 8 ASTM A179 380 200 Heat exchangers, condensers
ASTM A192 Carbon Steel 10.3 - 114.3 1.0 - 15.0 ASTM A192 325 180 Boiler tubes, high-pressure heat exchangers
ASTM A213 T22 Alloy Steel 12.7 - 88.9 1.2 - 12.7 ASTM A213 585 415 Boiler tubing, power generation, heat exchangers