Line Pipe

Line Pipe

A line pipe is a type of high-strength carbon steel pipeline utilized for transferring crude oil, petroleum products, natural gas, and water across the country. Bonded line pipelines are commonly used for interstate natural gas pipelines.


Crucial tests require to be performed on them due to the fact that pipelines are typically impacted by high pressures. During production, the line pipes are subjected to tempering, dimensional residential or commercial properties, strength and strength quality, and examination to ensure that they satisfy all requirements for the chemical, strength, toughness, and dimensional properties of steel. Adopting line Pipes in accordance with the defined conditions can make sure high safety and stability throughout the design life.

PRODUCT FEATURES

Types of Line Pipe

Line pipes can be categorized into different types. The following pipelines are classified according to the type of fluids and items transported.

- Water and Drain Line Pipe

These kinds of line pipes are typically utilized to carry water from treatment plants to buildings or houses. They form a network of underground pipes under cities and streets. Water pipes are normally buried numerous feet (one meter or more) underground. When metal pipes are used to carry drinking water, they are normally lined with plastic or cement inside to prevent rust. The exterior of the steel pipelines is also coated with asphalt products and wrapped with special tape to minimize corrosion due to exposure to particular soils.

- Oil Line Pipe

There are two types of oil pipeline: petroleum pipeline and product pipeline. While the former bring petroleum to refineries, the latter transports fine-tuned items such as gas, kerosene, jet fuel, and heating oil from refineries to the marketplace. Different grades of crude oil or various refined products are generally carried through the exact same pipeline in different batches. Blending in between batches is small and can be managed.

- Gas Line Pipe

Essentially all overland gas is transported by pipeline. The majority of other nations worldwide likewise use gas and have gas pipelines.

- Line Pipe for Carrying Other Fluids

Pipelines have been built to bring lots of other liquids. Liquid fertilizers, for example, are typically carried across countries by pipeline. Liquefied natural gas (LNG) transported by ships (tankers) also needs short pipelines to connect ships to the onshore tanks. On a smaller sized scale, many chemicals, food, and pharmaceutical plants utilize pipes to carry numerous liquids and gases within the plant.

Production Standards of Line Pipe

Line pipes are appropriate for a range of standards. According to consumer needs, production meets the line pipe of various standards. We are usually made according to metallurgical requirements that were developed by the American Petroleum Institute (API). API 5L Specifications cover seamless and welded line pipes suitable for use in conveying gas, water, oil, and other liquefied media. It is used in line pipe production worldwide. Pipelines are made in a wide variety, varying in size from 2 to 24 inches.

Dimensions and Sizes of Line Pipe

Line Pipe11

NPS

O. D.

Nominal Wall Thickness

DN

Inch

mm

SCH5S

SCH10S

SCH10

SCH20

SCH30

SCH40

SCH60

SCH80

SCH100

SCH120

SCH140

SCH160

STD

XS

XXS

50

2″

60.3

1.65

2.77

3.91

5.54

8.74

3.91

5.54

11.07

65

2-1/2″

73

2.11

3.05

5.16

7.01

9.53

5.16

7.01

14.02

80

3″

88.9

2.11

3.05

5.49

7.62

11.13

5.49

7.52

15.24

90

3-1/2″

101.6

2.11

3.05

5.74

8.08

5.74

8.08

100

4″

114.3

2.11

3.05

6.02

8.58

11.13

13.49

6.02

8.56

17.12

125

5″

141.3

2.77

3.4

6.55

9.53

12.7

15.88

6.55

9.53

18.05

150

6″

168.3

2.77

3.4

7.11

10.97

14.27

18.26

7.11

10.97

21.95

200

8″

219.1

2.77

3.76

6.35

7.04

8.18

10.31

12.7

15.09

18.26

20.62

23.01

8.18

12.7

22.23

250

10″

273.1

3.4

4.19

6.35

7.8

9.27

12.7

15.09

18.26

21.44

25.4

28.58

9.27

12.7

25.4

300

12″

323.9

3.96

4.57

6.35

8.38

10.31

14.27

17.48

21.44

25.4

28.58

33.32

9.53

12.7

25.4

350

14″

355.5

3.96

4.78

6.35

7.92

9.53

11.13

15.09

19.05

23.83

27.79

31.75

35.71

9.53

12.7

400

16″

406.4

4.19

4.78

6.35

7.92

9.53

12.7

16.66

21.44

26.19

30.96

36.53

40.49

9.53

12.7

450

18″

457.2

4.19

4.78

6.35

7.92

11.13

14.27

19.05

23.83

39.36

34.93

39.67

45.24

500

20″

508

4.78

5.54

6.35

9.53

12.7

15.09

20.62

26.19

32.54

38.1

44.45

50.01

550

22″

558.8

4.78

5.54

6.35

9.53

12.7

22.23

28.58

34.93

41.28

47.63

53.98

600

24″

609.6

5.54

6.35

6.35

9.53

14.27

17.48

24.61

30.96

38.89

46.02

52.37

59.54

If the sizes you are looking for are not in the chart above, please feel free to let us know. We will make efforts to meet your needs.

Lengths of Line Pipe

Reduced variety of girth welds reduces not only construction time, but also the risk of integrity loss caused by girth weld leakage during the operation. While a long line pipe reduces the variety of girth welds available, the length of the line pipe is limited by the factory’s production line, and it is simple to transport and manage at the construction site. While TUSPIPE can provide you with line pipes ranging in length from 5.8 to 18 meters to raise the work efficiency and reduce the risk.

Chemical composition of line pipe

- API 5L PSL-1 Chemical Component

Steel Grade

Mass fraction, based on melting and product analysis %

C

Mn

P

S

V

Nb

Ti

max.

max.

min.

max.

max.

max.

max.

max.

L175 or A25

0.21

0.60

0.030

0.030

L175P or A25P

0.21

0.60

0.045

0.080

0.030

L210 or GR. A

0.22

0.90

0.030

0.030

L245 or GR. B

0.26

1.20

0.030

0.030

L290 or X42

0.26

1.30

0.030

0.030

L320 or X46

0.26

1.40

0.030

0.030

L360 or X52

0.26

1.40

0.030

0.030

L390 or X56

0.26

1.40

0.030

0.030

L415 or X60

0.26

1.40

0.030

0.030

L450 or X65

0.26

1.45

0.030

0.030

L485 or X70

0.26

1.65

0.030

0.030

- API 5L PSL-2 Chemical Component

Steel Grade

Mass fraction, based on melting and product analysis %

CEC(%) max

C

Si

Mn

P

S

V

Nb

Ti

Other

CEIIW

CEPcm

L245M or BM

0.22

0.45

1.20

0.025

0.015

0.05

0.05

0.04

0.43

0.25

L290M or X42M

0.22

0.45

1.30

0.025

0.015

0.05

0.05

0.04

0.43

0.25

L320M or X46M

0.22

0.45

1.30

0.025

0.015

0.05

0.05

0.04

0.43

0.25

L360M or X52M

0.22

0.45

1.40

0.025

0.015

0.43

0.25

L390M or X56M

0.22

0.45

1.40

0.025

0.015

0.43

0.25

L415M or X60M

0.12

0.45

1.60

0.025

0.015

0.43

0.25

L450M or X65M

0.12

0.45

1.60

0.025

0.015

0.43

0.25

L485M or X70M

0.12

0.45

1.70

0.025

0.015

0.43

0.25

L555M or X80M

0.12

0.45

1.85

0.025

0.015

0.43

0.25

L625M or X90M

0.10

0.55

2.10

0.020

0.010

0.25

L690M or X100M

0.10

0.55

2.10

0.020

0.010

0.25

L830M or X120M

0.10

0.55

2.10

0.020

0.010

0.25

Line Pipe Coatings

- Fusion Bonded Epoxy (FBE) Coating

FBE has excellent adhesion to the pipeline surface, good corrosion resistance to chemical media, good temperature resistance, excellent corrosion resistance, cathodic peel resistance, aging resistance, and resistance to soil stress, among other properties. It operates over a wide temperature range (standard FBE operates between -30°C and 100°C), making it suitable for most soil environments and directional drilling through clay soils.

- Three Layers Polyethylene (3PE) Coating

Three-layer polyethylene (3PE) anticorrosive coating combines the advantages of epoxy powder FBE and two-layer PE coating to overcome the disadvantages of each anticorrosive process. The primary anticorrosive agent is FBE. PE is primarily used to protect FBE from mechanical damage and has a high resistance to water penetration. The three-layer polyethylene coating system provides superior mechanical properties that match the coating material’s properties, and the coating can withstand temperatures of up to 50°C (low density and medium density polyethylene) or 70°C (high-density polyethylene).

- Three Layers Polypropylene (3PP) Coating

The three-layer polypropylene anticorrosive coating (3PP) consists of a base layer of epoxy powder, an intermediate layer of binder, and an outer layer of polypropylene (PP) jacket. The 3PP incorporates all the advantages of 3PE and significantly improves its operating temperature performance. 3PP coating is primarily used as an anticorrosive pipeline layer for conveying medium with a high temperature and as a pipeline anticorrosive layer in desert areas with a high surface temperature and a prolonged period of sunshine.

- Epoxy Coal Pitch Anticorrosion Coating

Epoxy Coal Pitch Anticorrosion Coating made of epoxy resin, coal tar asphalt, and filler is reinforced with glass cloth on the surface of the pipeline pipe to form an anti-corrosion layer, which is frequently used to protect the exterior wall of the pipes from corrosion.

- Silicone Anticorrosion Coating

Silicone anticorrosion layer, hard silicon calcium tile insulation layer, galvanized iron wire reinforcement layer, aluminum silicate fiber cloth waterproof layer, steel sleeve, and titanium aluminum alloy and silicone coating surfaces. Silicone resin, ceramic powder, talcum powder, mica powder, aluminum oxide powder, and titanate coating curing are used to create the silicone anticorrosion layer. With anti-corrosion, heat preservation, waterproofing, and external protection capabilities, its silicone anticorrosion layer can withstand temperatures up to 600°C, making it suitable for transporting 550°C high-temperature medium insulation pipeline.

- Internal Coating

It is primarily classified into two types according to the transmission medium: one is used to reduce friction between the pipeline transmission medium and the pipeline pipe’s inner wall, referred to as “internal resistance reduction coating.” The drag-reducing inner coating can increase the fluidity of the conveying medium, allowing for the elimination of pressure stations and a decrease in pipeline investment. The other is to prevent the conveying medium from corroding the inner wall of the steel pipe, which requires a layer of anti-corrosion coating referred to as “internal anti-corrosion coating.” Inner coatings that are resistant to corrosion can increase pipeline safety and extend the life of the pipeline. Inner coatings with varying properties are available for use in water delivery and other chemical environments.

Features of Line Pipe Coating

- Thickness Requirements for Pipeline Anti-corrosion Coating

Nominal Diameter

Epoxy Coating/μm

Adhesive Coating/μm

Min. Thickness of PE Coating

Common (mm)

Enhanced (mm)

DN≤100

≥120

≥170

1.8

2.5

100<DN≤250

2.0

2.7

250<DN≤500

2.2

2.9

500<DN≤850

2.5

3.2

DN≥800

3.0

3.7

- Performance Index of Fused Epoxy Coating

No.

Item

Performance Indicators

1

Adhesion, Classification

≤2

2

Cathode Racking (65℃,48h)/mm

Racking Distance ≤8

3

Cathode Racking (65℃,30d)/mm

Racking Distance ≤15

4

Anti-bending (-20℃,2.5°)

No Crack

- Performance Index of Two-Layer Structure Adhesive

No.

Item

Performance Indicators

1

Density (g/cm²)

0.920 – 0.950

2

Melt Flow Rate (190℃,2.16kg)(g/10min)

≥0.7

3

Vicat Softening (℃)

≥90

4

Brittle Temperature (℃)

≤-50

5

Oxidation Induction Time (200℃)

≥10

6

Moisture Content %

≤0.1

7

Tensile Strength Mpa

≥17

8

Elongation after Fracture %

≥600

- Performance Index of Two-Layer Structure Adhesive

No.

Item

Performance Indicators

1

Tensile Strength

Axial Direction, Mpa

≥20

Circumferential Direction, Mpa

≥20

Deviation, %

≤15

2

Elongation after Fracture, %

≥600

3

Indentation Hardness (mm)

23℃

≤0.2

50℃ or 70℃

≤0.3

4

Endurably Environmental Stress Cracking (F50),h

≥1000

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