PRESSURE Pipe

Pressure Pipe

A pressure pipe is a type of underground pipeline that is used to transport steam, water, oil, gas, and air in a municipal distribution network. It is a vital conduit that transports steam, water, oil, gas, and air to smaller pipes that connect to homes and businesses. For example, pressure pipes transport safe drinking water from a city’s water treatment plant to communities in need, making them a critical component of a nation’s utility infrastructure. The Pressure Pipes carry a large volume of water under pressure to neighborhoods that rely on water mains to deliver safe drinking water from the city’s water treatment facility.

Pressure Pipes come in a variety of sizes and shapes. They range from large-diameter main lines that serve entire towns to smaller branch lines that serve a single street or group of buildings to small diameter pipes located within individual buildings. Pressure Pipes come in a variety of sizes, from massive mains with a diameter of up to 3.65 meters to small 12.7 mm pipes used to supply individual outlets within a building.

Pressure Pipes can deteriorate due to a variety of factors such as tuberculation, faulty joints, insufficient hydraulic capacity, and corrosion. Pressure Pipes have been identified as a critical issue in developed countries’ aging utility infrastructures. Although pressure steel pipes are more expensive than other types of ordinary pipes, they are the strongest and most durable. They can withstand high pressure, are available in more convenient (longer) lengths than most other pipes, and thus cost less to install/transport. Additionally, they are easily welded.

PRESSURE PIPE PRODUCT FEATURES

Dimensions and Sizes of PRESSURE Pipe

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

PRESSURE PIPE COATING

Coatings on both the external and internal surfaces extend the life of steel pressure pipes.

- External Coating of Pressure Pipes

Pressure Pipe Property

Typical Values

Density grade

HDPE (High density Polyethene)

Thickness, mm

> 2,2  (DN 400 – 450)

> 2,5  (DN 500 – 750)

> 3,0  (DN 800 – 1200)

Increased thickness + 0,7

Bond strenght at +20 ⁰C, N/cm

> 120

Impact resistance, J/mm

> 5

Identation at +23 ⁰C, mm

< 0,2

Breaking elongation, %

> 400

Specific resistance, Ωm2

> 108

Thermal ageing, %

< 35

Light ageing, %

< 35

Cathodic disbonding, 30 days, mm

< 5

Ambient temperature, ⁰C

– 40 to +80

- Internal Cement Mortal Lining of Pressure Pipes

Pressure Pipe Property

Typical Values

Thickness, mm

8 ± 2  (DN 400 – 600)

10 ± 3  (DN 650 – 900)

12 ± 2   (DN 950 – 1200)

Flexural tensile strength, N/mm2

> 5

Compressive strength, N/mm2

> 50

- Zinc Coating of Pressure Pipes

The zinc coating of pressure pipe has been used since 1742, offering long-lasting, maintenance-free corrosion protection at a low cost for decades. Although hot-dip galvanizing has been applied to preserve steel for decades, the galvanizing process continues to advance with new technology and inventive chemistries. The three primary processes in the hot-dip galvanizing process are surface preparation, galvanizing, and post-treatment, each of which will be covered in depth. The technique is naturally straight, which is a unique benefit over alternative corrosion prevention approaches.

When iron or steel is immersed in molten zinc, it forms a corrosion-resistant, multi-layered coating of zinc-iron alloy and zinc metal, which is resistant to corrosion. The steel is submerged in the zinc, and during this time, a metallurgical reaction takes place between the iron present in the steel and the liquid zinc. The coating develops perpendicular to all surfaces because of the diffusion process, which results in an even thickness over the whole component.

production standard of pressure Pipe

Features of Pressure Pipe Coating

- Thickness Requirements for Pressure Pipe 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

TYPES OF Pressure Pipe Coating

- Fusion Bonded Epoxy (FBE) Coating

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

- Three Layers Polyethylene (3PE) Coating

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

- Three Layers Polypropylene (3PP) Coating

A base layer of epoxy powder, an intermediate layer of binder, and an outer layer of polypropylene (PP) jacket make up the three-layer polypropylene anticorrosive coating (3PP). The 3PP takes all of the benefits of the 3PE and improves its operating temperature performance significantly. 3PP coating is primarily used as an anticorrosive pipeline layer for conveying high-temperature mediums and as an anticorrosive pipeline layer in desert areas with high surface temperatures and long periods of sunshine.

- Epoxy Coal Pitch Anticorrosion Coating

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

- Silicone Anticorrosion Coating

Steel sleeve, silicone anticorrosion layer, hard silicon calcium tile insulation layer, galvanized iron wire reinforcement layer, aluminum silicate fiber cloth waterproof layer, titanium aluminum alloy, and silicone coating surfaces The silicone anticorrosion layer is made up of silicone resin, ceramic powder, talcum powder, mica powder, aluminum oxide powder, and titanate coating curing. Its silicone anticorrosion layer can withstand temperatures up to 600°C, making it suitable for transporting a 550°C high-temperature medium insulation pipeline. It also has anti-corrosion, heat preservation, waterproofing, and external protection capabilities.

- Internal Coating

It is primarily classified into two types based on 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,” and the other is used to reduce friction between the pipeline transmission medium and the pipeline pipe’s outer wall, referred to as “external resistance reduction coating.” The drag-reducing inner coating can increase the fluidity of the conveying medium, allowing pressure stations to be removed and pipeline investment to be reduced. The other is to prevent the conveying medium from corroding the steel pipe’s inner wall, which necessitates an anti-corrosion layer known as “internal anti-corrosion coating.” Corrosion-resistant inner coatings can improve pipeline safety and lifespan. In water delivery and other chemical environments, inner coatings with varying properties are available.

show various kind of galvanized pipes
Galvanized Pipe
Pipe Coating
Boiler Tube
pipe-fittings
Pipe Fittings
Scroll to Top

Get A Quote Now

Fill in the form below and our team will be happy to assist you