Line pipe is a pipe used to transport liquids, gases or solid particles, and is widely used in the fields of petroleum, natural gas, chemical industry, water conservancy, etc. The following is its definition and function.
Line pipe is a steel pipe manufactured by welding or seamless process, usually in accordance with international or industry standards (such as API, ISO, etc.), used for long-distance transportation of oil, natural gas, water and other media.
Transport medium:
Used to transport fluids such as crude oil, natural gas, refined oil, water, etc.
It can also transport special media such as slurry and chemicals.
Long-distance transportation:
Connect production areas and consumption areas to achieve efficient allocation of resources.
Pressure and corrosion resistance:
Able to withstand high pressure and harsh environment to ensure safe transportation.
Economic and efficient:
Provide low-cost and efficient transportation methods to reduce dependence on roads and railways.
Environmental protection and safety:
Reduce the risk of leakage and pollution during transportation.
1. Oil and gas industry:
Crude oil transportation: transporting crude oil from oil fields to refineries or oil storage facilities.
Natural gas transportation: transporting natural gas from gas fields to urban gas networks or liquefied natural gas (LNG) facilities.
Product oil transportation: transporting gasoline, diesel and other finished oil to consumer markets.
2. Chemical industry:
Chemical transportation: transporting chemicals such as acids, alkalis, solvents.
Liquid gas transportation: transporting liquefied petroleum gas (LPG) or liquefied natural gas (LNG).
3. Water conservancy projects:
Tap water transportation: transporting water from water sources to urban water supply systems.
Sewage discharge: transporting industrial wastewater or domestic sewage to treatment facilities.
Irrigation system: used for agricultural irrigation, transporting irrigation water.
4. Mining and metallurgical industry:
Slurry transportation: transporting a mixture of ore and water (slurry) from mines to processing plants.
Tailings discharge: transporting tailings generated during mining to tailings ponds.
5. Energy and power industry:
Heat transmission: transport steam or hot water for heating or power generation.
Cooling water system: transport cooling water to power plants or other industrial facilities.
6. Marine engineering:
Submarine pipeline: used for the development of offshore oil and gas fields, transporting crude oil, natural gas or water.
Desalination: transport seawater to desalination facilities or discharge desalinated wastewater.
7. Urban infrastructure:
Gas pipeline: transport natural gas to residential areas or industrial users.
Heating pipeline: used for urban centralized heating systems.
Standard | Type of pipe | Class | Grade | C | Si | Mn | P | S | V | Nb | Ti |
max | max | max | max | max | max | max | max | ||||
API SPEC 5L | SMLS | PLS1 | L245 B L290 X42 L320 X46 L360 X52 L390 X56 L415 X60 L450 X65 L485 X70 L245N BN | 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.24 | 0.4 | 1.20 1.30 1.40 1.40 1.40 1.40 1.40 1.40 1.20 | 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.025 | 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.015 | ——— | ——— | 0.04 |
PLS2 | L290N X42N | 0.24 | 0.4 | 1.2 | 0.025 | 0.015 | 0.06 | 0.05 | 0.04 | ||
L320N X46N | 0.24 | 0.4 | 1.4 | 0.025 | 0.015 | 0.07 | 0.05 | 0.04 | |||
L360N X52N | 0.24 | 0.45 | 1.4 | 0.025 | 0.015 | 0.1 | 0.05 | 0.04 | |||
L390N X56N | 0.24 | 0.45 | 1.4 | 0.025 | 0.015 | 0.1 | 0.05 | 0.04 | |||
L415N X60N | 0.24 | 0.45 | 1.4 | 0.025 | 0.015 | 0.1 | 0.05 | 0.04 | |||
WELD | PLS1 | L245 B | 0.26 | - | 1.2 | - | 0.03 | 0.03 | - | - | |
L290 X42 | 0.26 | - | 1.3 | - | 0.03 | 0.03 | - | - | |||
L320 X46 | 0.26 | - | 1.4 | - | 0.03 | 0.03 | - | - | |||
L360 X52 | 0.26 | - | 1.4 | - | 0.03 | 0.03 | - | - | |||
L390 X56 | 0.26 | - | 1.4 | - | 0.03 | 0.03 | - | - | |||
L415 X60 | 0.26 | - | 1.4 | - | 0.03 | 0.03 | - | - | |||
L450 X65 | 0.26 | - | 1.45 | - | 0.03 | 0.03 | - | - | |||
L485 X70 | 0.26 | - | 1.65 | - | 0.03 | 0.03 | - | - | |||
PLS2 | L245M BM | 0.22 | 0.45 | 1.2 | 0.025 | 0.015 | 0.05 | 0.05 | 0.04 | ||
L290M X42M | 0.22 | 0.45 | 1.3 | 0.025 | 0.015 | 0.05 | 0.05 | 0.04 | |||
L320M X46M | 0.22 | 0.45 | 1.3 | 0.025 | 0.015 | 0.05 | 0.05 | 0.04 | |||
L360M X52M | 0.22 | 0.45 | 1.4 | 0.025 | 0.015 | - | - | - | |||
L390M X56M | 0.22 | 0.45 | 1.4 | 0.025 | 0.015 | - | - | - | |||
L415M X60M | 0.12 | 0.45 | 1.6 | 0.025 | 0.015 | - | - | - | |||
L450M X65M | 0.12 | 0.45 | 1.6 | 0.025 | 0.015 | - | - | - | |||
L485M X70M | 0.12 | 0.45 | 1.7 | 0.025 | 0.015 | - | - | - | |||
L555M X80M | 0.12 | 0.45 | 1.85 | 0.025 | 0.015 | - | - |
Standard | Class | Grade | Yield strength not less than (MPa) | Tensile strength (MPa) | Elongation(%) | Y.S/T.S | |
API SPEC 5L ISO 3183 | PLS1 | L245B | min | 245 | 415 | b | - |
L290X42 | min | 290 | 415 | b | - | ||
L320X46 | min | 320 | 435 | b | - | ||
L360X52 | min | 360 | 460 | b | - | ||
L390X56 | min | 390 | 490 | b | - | ||
L415X60 | min | 415 | 520 | b | - | ||
L450X60 | min | 450 | 535 | b | - | ||
L485X70 | min | 485 | 570 | b | - | ||
PLS2 | L245N BN | min | 245 | 415 | b | - | |
L245M BM | max | 450 | 760 | b | 0.93 | ||
L290NX42N | min | 290 | 415 | b | - | ||
L290MX42M | max | 495 | 760 | b | 0.93 | ||
L320NX46N | min | 320 | 435 | b | - | ||
L320MX46M | max | 525 | 760 | b | 0.93 | ||
L360NX52N | min | 360 | 460 | b | - | ||
L360MX52M | max | 530 | 760 | b | 0.93 | ||
L390NX56N | min | 390 | 490 | b | - | ||
L390MX56M | max | 545 | 760 | b | 0.93 | ||
L415NX60N | min | 415 | 520 | b | - | ||
L415MX60M | max | 565 | 760 | b | 0.93 | ||
L450MX65M | min | 450 | 535 | b | - | ||
max | 600 | 760 | b | 0.93 | |||
L485MX70M | min | 485 | 570 | b | - | ||
max | 635 | 760 | b | 0.93 | |||
L555MX80M | min | 555 | 625 | b | - | ||
max | 705 | 825 | b | 0.93 |