High temperature resistance of steel-lined PTFE pipeline

Steel-lined PTFE pipeline material is a polymer compound polymerized from tetrafluoroethylene, which has excellent chemical stability, corrosion resistance, strong sealing, high lubrication and non-stickiness, electrical insulation, good aging resistance and excellent temperature resistance. Temperature? -20 ~ 250℃ (-4 ~+482 F), allowing sudden cooling and heating, or alternating hot and cold operation.

Advantages of steel lined PTFE pipeline;

High temperature resistance-the working temperature reaches 250℃.

Low temperature resistance-good mechanical toughness; Even if the temperature drops to-196℃, the elongation of 5% can be maintained.

Corrosion resistance-inert to most chemicals and solvents, resistant to strong acid and alkali, water and various organic solvents.

Weather resistance-has the best aging life among plastics.

High lubrication-the lowest coefficient of friction among solid materials.

Non-stick-it is the smallest surface tension in solid materials and does not stick to anything.

Non-toxic-non-toxic to living things.

Test, inspection and application scope of steel-lined PTFE pipeline

After 1, the steel-lined PTFE pipes and fittings shall be subjected to a hydraulic test at 1.5 times the design pressure.

2. After hydrostatic test, test the integrity of PTFE lining at 100%, and test the leakage point with electric spark.

3. Scope of use? A. service temperature -20~200℃? B. service pressure ≤2.5Mpa? C. Allow negative pressure? DN≤250mm is -0.09Mpa, and dn > 250mm is -0.08Mpa? Can transport any concentration of strong acid, alkali, organic solvent, strong oxidant, toxic, volatile and flammable chemical media. ?

Selection requirements of steel pipes and flanges for steel-lined PTFE pipelines

1. Steel-lined PTFE pipes adopt national standard seamless steel pipes. Due to the process requirements, the effective diameter of the pipeline in the lining is smaller than the nominal diameter of the steel pipe. Designers and users determine the diameter of steel pipes after implementing the necessary effective flow standards.

2. Flanges can be forged according to national standards such as HG, GB, JB, ANSI, JIS, BS and DIN. , can also be determined by contract. Because of the processing technology of sealing surface, it is recommended to choose flat welding flange with plate and flat welding flange with neck. The sealing surfaces are all plane sealing types. In order to facilitate pipeline installation, users can provide flat welding ring movable flange.