PRESSURE Pipe
Pressure Pipe
A pressure pipe is a type of underground pipeline used to transport liquids and gases under high pressure. Common applications for pressure pipes include steam and water lines, gas mains, and oil lines. Pressure pipe is typically made from steel, and is joined together using specialized techniques and fittings. To ensure the safety of the pipeline, pressure pipes are regularly inspected and tested for leaks and corrosion. By understanding pressure pipe systems, engineers can safely transport liquids and gases underground without fear of leaks or bursting pipes.
Why choose tuspipe?
Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.
With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.
TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality, the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.
Dimensions and Sizes of Pressure Pipe
| DN | O. D. | W. T. | |||||||||||||||
| 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 strength 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
Zinc coatings on pressure pipes are galvanized to protect the steel pipe from corrosion. The galvanized coating is applied in a hot-dip process where the steel is dipped in a molten zinc bath. The zinc bonded to the surface of the pipe and provides a protective barrier against corrosion. galvanized pressure pipes are often used in applications where the pipe will be exposed to corrosive environments. The galvanized coating provides maintenance and protection for the pipe at a much lower cost than other methods of corrosion protection. Galvanized pressure pipes have a long history of successful use in a variety of industries and are an excellent choice for corrosion protection in pressurized applications.
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 | 2.7 | ||
| 250＜DN≤500 | 2.2 | 2.9 | ||
| 500＜DN≤850 | 2.5 | 3.2 | ||
| DN≥800 | 3 | 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
Fusion bonded epoxy, or FBE, is a type of coating that offers excellent pressure pipe adhesion and resistance to corrosion, media, temperature, and stress. Because it can operate over a wide temperature range, it is suitable for most soil environments and directional drilling through clay soils. In addition, FBE coatings offer good cathodic peel resistance and aging resistance, making them an ideal choice for a variety of applications.
- Three Layers Polyethylene (3PE) Coating
The three-layer polyethylene (3PE) anticorrosive coating system is a highly effective solution for the protection of pipelines. It combines the advantages of epoxy powder FBE and two-layer PE coating, providing superior mechanical properties and resistance to temperatures of up to 50°C or 70°C. 3PE has a high resistance to water penetration and is primarily used to protect FBE from mechanical damage. The three-layer system provides an excellent balance of properties that make it an ideal solution for a wide range of pipeline applications.
- Three Layers Polypropylene (3PP) Coating
3PP coating is a three-layer polypropylene anticorrosive coating that consists of a base layer of epoxy powder, an intermediate layer of binder, and an outer layer of polypropylene (PP) jacket. The 3PP coating takes all of the benefits of the 3PE coating and improves its operating temperature performance significantly. 3PP coatings are 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. The improved operating temperature performance of the 3PP coating makes it an ideal choice for use in pipeline applications where elevated temperatures are a concern.
- Epoxy Coal Pitch Anticorrosion Coating
Epoxy coal pitch anticorrosion coating is a type of coating often used to protect pipes from corrosion. The coating is made up of epoxy resin, coal tar asphalt, and filler, which are reinforced with glass cloth to form a protective layer. This type of coating is typically applied to the exterior surfaces of pipes, and it can help to extend the lifespan of the pipe by protecting it from corrosion. In addition, epoxy coal pitch anti-corrosion coatings can also improve the appearance of the pipe by providing a smooth, finished surface.
- Silicone Anticorrosion Coating
Silicone Anticorrosion Coating is a kind of anticorrosive paint that is made up of silicone resin, ceramic powder, talcum powder, mica powder, aluminum oxide powder and titanate coating curing. It has good adhesion to a substrate, flexibility and heat resistance (up to 600°C in service), making it an ideal coating for steel sleeve protection in hot environments such as power plants. The hard silicon calcium tile insulation layer provides excellent high temperature resistance (up to 1260°C), while the galvanized iron wire reinforcement layer gives the composite pipe mechanical strength and durability. Finally, the aluminum silicate fiber cloth waterproof layer and titanium aluminum alloy outer surface provide superior corrosion protection, making this an ideal product for use in aggressive environments.
- Internal Coating
Internal coating for pipelines is applied for the purpose of reducing fluid drag and corrosion. steel pipeline is coated with a layer of material on the inner wall which provides resistance to the flow of fluid or gas. This helps to reduce the friction between the fluid and the steel surface, thus decreasing the overall drag on the pipeline. In addition, internal coating can also help to protect the steel from chemical attack and reduce the risk of leaks. As a result, internal coating is an important factor in ensuring the safe and efficient operation of pipelines.
