PTFE Lined Tee Product Details
1. General Introduction
The PTFE lined tee is a high - performance pipe fitting designed to meet the needs of complex industrial pipeline systems. It is widely used in industries where corrosion resistance and chemical stability are crucial, such as chemical engineering, petrochemical, pharmaceutical, and food processing.
2. Structure and Materials
2.1 Structure
- The tee consists of a main body and branch pipes, forming a "T" shape. The connection between the main body and branch pipes is smooth to ensure the smooth flow of media.
- The inner surface of the tee is lined with polytetrafluoroethylene (PTFE), while the outer shell is usually made of carbon steel, stainless steel or other metal materials, combining the advantages of metal strength and PTFE's excellent corrosion resistance.
2.2 Materials
- Lining Material: High - quality PTFE is used as the lining material. PTFE has outstanding chemical stability, being resistant to almost all chemicals except molten alkali metals, fluorine - containing media such as trifluorochloride and uranium hexafluoride, and perfluorokerosene. It can maintain stable performance within a wide temperature range from - 200°C to 260°C.
- Outer Shell Material:
- Carbon Steel: Offers high strength and good mechanical properties, suitable for general - purpose applications. It can be used in environments where the medium does not have strong corrosive effects on carbon steel, and the PTFE lining provides protection against the internal medium.
- Stainless Steel: Such as 304 or 316 stainless steel, is chosen when higher corrosion resistance and better mechanical properties are required, especially in harsh chemical environments or applications with strict hygiene requirements.
3. Technical Specifications
3.1 Size Range
- Nominal diameters usually range from DN15 (1/2") to DN600 (24"), which can meet the connection needs of pipelines of different sizes in various industrial systems. For special project requirements, custom - sized products can also be provided.
3.2 Pressure - Temperature Ratings
- Operating Pressure: Generally, it can withstand pressures from - 0.1MPa (negative pressure, suitable for vacuum systems) to 2.5MPa. Different manufacturing processes and material combinations may result in different pressure - bearing capacities.
- Operating Temperature: As mentioned above, the service temperature range is from - 200°C to 260°C. Under positive pressure conditions, it can operate stably at temperatures up to 260°C, and under negative pressure, the upper - limit temperature is usually around 200°C.
3.3 Lining Thickness
- The thickness of the PTFE lining is usually between 3mm - 6mm. A thicker lining can provide better corrosion resistance and wear resistance, but it may also affect the flow cross - section of the pipeline to a certain extent. The specific thickness is determined according to the application requirements, operating pressure, and temperature conditions.
4. Manufacturing Process
4.1 PTFE Lining Process
- Powder Molding Process: PTFE powder is filled into the mold of the tee's inner cavity. Under a certain pressure and temperature, the powder is sintered and molded to form a continuous and uniform lining layer. This process is suitable for applications with relatively low operating pressures ( - 0.07~2.5Mpa), and the temperature limit is 170°C under positive pressure and 130°C under negative pressure.
- Isostatic Molding Process (High - Pressure Molding): In this process, PTFE is subjected to high - pressure isostatic pressing (usually 30MPA). The formed lining has higher density and better performance. It can be used in operating conditions of - 0.098~2.5Mpa, with a temperature limit of 220°C under positive pressure and 200°C under negative pressure, and can also be used in extreme vacuum conditions.
4.2 Assembly Process
- After the PTFE lining is completed, the outer metal shell is welded and assembled. The flanges at both ends of the tee are usually made of the same material as the outer shell and are welded or bolt - connected according to relevant standards to ensure the tightness and strength of the connection.
5. Application Scenarios
- Chemical Industry: Used in the transportation of various strong acids (such as sulfuric acid, nitric acid, hydrochloric acid), strong alkalis (such as sodium hydroxide, potassium hydroxide), and organic solvents, which can effectively prevent pipeline corrosion and ensure the normal operation of the production process.
- Pharmaceutical Industry: Since PTFE is non - toxic and has good chemical stability, it can be used in the pipeline systems for pharmaceutical production, ensuring the purity and quality of drugs during transportation.
- Food Processing Industry: It can be used in the pipelines for transporting food - grade liquids or gases, as PTFE does not release harmful substances and will not contaminate food products.
6. Installation and Maintenance
6.1 Installation
- During installation, ensure that the axes of the connected pipelines are aligned with the tee to avoid stress concentration. Flange connections should be tightened evenly according to the specified torque to ensure a good seal.
- Do not damage the PTFE lining during the installation process, such as avoiding excessive impact or scratching.
6.2 Maintenance
- Regularly inspect the appearance of the tee for any signs of leakage, damage to the outer shell, or abnormal deformation.
- If the medium contains solid particles or impurities, it is necessary to install filters upstream to prevent abrasion of the PTFE lining.
- In the case of long - term shutdown, the tee should be cleaned and dried to prevent corrosion caused by residual media.
){kind=link}