Fluorine-lined Pipelines
Fiidltekii Steel-Lined Fluoroplastic Pipeline
Steellined fluoroplastic pipeline is a composite pipeline that integrates the strength of metal substrates and the corrosion resistance of fluoroplastics. It is widely used in chemical, petroleum, pharmaceutical, metallurgical, environmental protection and other industries. It can safely transport various corrosive media such as strong acids, strong alkalis, strong oxidants and organic solvents, effectively solving the industry pain points of traditional steel pipelines being prone to corrosion and plastic pipelines lacking sufficient strength. The substrates of this product include two major categories: carbon steel and stainless steel. The lined fluoroplastics include three mainstream materials: Polytetrafluoroethylene (PTFE), Perfluoroalkoxy Alkane (PFA) and Fluorinated Ethylene Propylene (FEP). The whole production process complies with domestic and international standards to ensure stable product performance and reliable quality.
I. Fiildtekii Core Composition of the Product
(I) Substrate Selection
Carbon steel substrate;
Stainless steel substrate (304, 316L);
Other customized materials.
(II) Lined Fluoroplastic Selection
PTFE (Polytetrafluoroethylene);
PFA (Perfluoroalkoxy Alkane);
FEP (Fluorinated Ethylene Propylene).
II. Fiildtekii Core Production Process
The core of steellined fluoroplastic pipeline production is to achieve tight bonding between the metal substrate and the fluoroplastic lining, eliminating defects such as delamination, bubbles and pinholes. The whole process is divided into four links: substrate pretreatment, lining forming, curing and shaping, and port treatment. Different fluoroplastic materials are adapted to different forming processes. The specific process is as follows:
(I) Pretreatment of Substrate and Fluoroplastic
The quality of substrate treatment directly determines the adhesion between the lining and the substrate. Fiildtekii sequentially adopts oil removal, rust removal, sandblasting and other treatment methods, and polishes the flange nozzles, ports and other parts to make them smooth, so that the substrate meets the lining conditions.
For different fluoroplastics, drying, preheating and other treatment methods are carried out.
(II) Lining Forming Process
According to the characteristics of fluoroplastic materials, corresponding forming processes are adopted to ensure uniform lining thickness and tight bonding with the substrate. Key parameters such as heating temperature, pressure and time are strictly controlled to avoid material degradation or poor bonding:
1. PTFE lining process: Tight lining method, loose lining method, spraying method, isostatic pressing method and high-pressure tight lining method can be selected.
2. PFA lining process: Welding method, molding method, isostatic pressing method and spraying method can be selected.
3. FEP lining process: Welding method, molding method, isostatic pressing method and spraying method can be selected.
(III) Curing, Shaping and Port Treatment
After the lining is formed, the curing temperature and time are controlled according to the material characteristics to ensure that the fluoroplastic is fully melted and shaped, forming a firm bond with the substrate and avoiding shrinkage and delamination in later use. After curing, the pipeline port is trimmed and polished, and the fluoroplastic lining is flanged to cover the flange sealing surface, which is fixed with a special mold to enhance the port tightness and prevent medium leakage from the port. At the same time, the exposed metal parts are painted with anti-corrosion coating to improve the overall anti-corrosion performance of the substrate.
III. Strict Quality Control System
Adhering to the principle of "full-process control and zero-defect delivery", a multi-link quality inspection mechanism is established from the entry of raw materials to the delivery of finished products to ensure that each batch of products meets the use requirements. Finally, each batch of products undergoes water pressure test, air tightness test and electric spark test to ensure that each batch of products complies with domestic and international standards.
IV. Product Advantages and Application Scenarios
This steellined fluoroplastic pipeline combines the high strength and pressure resistance of carbon steel/stainless steel with the excellent corrosion resistance of fluoroplastics, and also has the advantages of high temperature resistance, aging resistance, no leakage and easy installation. The substrate and lining materials can be flexibly selected according to the working conditions: the combination of carbon steel + FEP is suitable for conventional medium and low temperature anticorrosion scenarios with high cost performance; the combination of stainless steel + PTFE/PFA is suitable for highpurity, hightemperature and strongcorrosion scenarios, and is applicable to industries such as medicine, electronics and chlor-alkali chemical industry; PTFE-lined pipelines are suitable for the transportation of high-temperature and strong-corrosion media, and PFA-lined pipelines are suitable for complex pipe fittings and high-precision sealing requirements.
The product is produced in full compliance with domestic&international standards, with controllable quality and long service life. It can effectively reduce pipeline maintenance costs, eliminate safety accidents and environmental pollution caused by leakage of corrosive media, and is an ideal choice for the transportation of industrial corrosive media.
