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 |