Anti-corrosion with polytetrafluoroethylene

Lined steel pipe is made by using ordinary carbon steel pipe as the base material and lining it with thermoplastic plastic with excellent chemical stability. It is formed through cold drawing composite or rotational molding. It not only has the mechanical properties of steel pipe but also the corrosion resistance, scale inhibition and low microbial growth characteristics of plastic pipe. It is an ideal pipe for transporting media such as acid, alkali, salt and corrosive gas. The inner lining is made of food-grade polypropylene and can be used in the food, pharmaceutical and drinking water industries.

Common lined plastic steel pipes include:

Steel-lined polypropylene pipe (PP)
Steel-lined polyolefin pipe (PO)
Steel-lined polyethylene pipe (PE)
Steel-lined polytetrafluoroethylene tube (PTFE)

Characteristics of lined steel pipes
1. One It has excellent physical properties
2. It has excellent corrosion resistance
3. The mechanical strength is the same as that of steel pipes
4. Hygienic, non-toxic, does not accumulate scale, does not breed microorganisms, and ensures the quality of the fluid
5. Resistant to chemical corrosion, soil and Marine biological corrosion, and cathodic disbondment
6. The installation process is mature, convenient and fast
7. It has good weather resistance and is suitable for harsh environments such as deserts and saline-alkali areas
8. The pipe wall is smooth, which improves the conveying efficiency and has a long service life

Application fields of lined plastic steel pipes
1. Chemical industry: Process pipes and discharge pipes for transporting corrosive gases, liquids, and solid powders in the manufacturing of acids, alkalis, salts, fertilizers, pesticides, chemicals, rubber and plastics, and other industries.
2. Power engineering: Process water return water transportation, water treatment, waste residue, and fly ash transportation.
3. Smelting industry: Transportation of corrosive media in metal smelting.
4. Mining industry: Discharge of mineral powder, pulp, slag and tailings, backfilling, ventilation, gas drainage and shotcrete, etc.
5. Pharmaceutical industry: Conveying various corrosive media, sewage and wastewater.
6. Oil and gas fields: Oily wastewater, gas field wastewater, oil and gas mixtures, oil production and gathering and transportation process pipelines.
7. Agricultural sprinkler irrigation: deep well pipes, filter pipes, underground channel delivery pipes, drainage pipes, irrigation water supply pipes.
8. Municipal industry: Urban building water supply, drinking water, fire protection water, heat network return water, gas and natural gas transmission, underground drainage of expressways and irrigation of green belts, etc

Application conditions of lined plastic steel pipes
one Vacuum value (i.e. Negative pressure) DN25-DN80:≤90kPa
DN100-DN150:≤70KPa
≥DN200:≤55KPa
2 Positive pressure DN25-DN80:≤6.4MPa
DN100-6:6.4 MPa or less
Acuity DN200:2.5 MPa or less

The operating temperature of folded lined plastic steel pipes
1. The working temperature of the medium for steel-lined polypropylene pipe (PP) is -15℃ to 110℃
2. The working temperature of the medium for steel-lined polyethylene pipes (PE) is -15℃ to 70℃
3. The working temperature of the medium for steel-lined polyolefin pipes (PO) : -20℃ to 90℃
4. The working temperature of the medium for steel-lined polytetrafluoroethylene (PTFE) tubes: -20℃ to 180℃

Lined plastic steel pipe is a composite steel pipe made by combining various modified blend polymers with steel pipes through a special process. It not only retains the strength of steel pipes and traditional connection methods, but also, through different modifications of plastic materials, fully exploits the characteristics of plastic materials such as corrosion resistance, anti-aging, high wear resistance, rust-free, non-toxic, and smooth inner walls. The modified corrosion-resistant lined plastic steel pipe is an alternative product to industrial pipelines in industries such as petroleum, chemical engineering, power, coal, shipping, and ports.