Testing, inspection and use of PTFE equipment
1, pipe and pipe fittings are 1.5 times the design pressure after the water pressure test.
2, where the liner liner is involved in the water pressure test. Conduct the integrity test, PTFE Board Lining Process Equipment the leakage point test method using EDM test
3, the use of range
A. Use temperature -20 ~ 200 ℃
B. Use pressure ≤ 2.5Mpa
C. Allow negative pressure DN ≤ 250mm to -0.09Mpa, DN> 250mm to -0.08Mpa
D. Can transport any concentration of strong acid, alkali, organic solvents, strong oxidants, toxic, volatile, flammable chemical media.
As the PTFE material is expensive, the strength is lower than the steel, it is generally made of lining, outside the metal shell protection and enhancement, constitute a whole. In this way, the lining layer can be corrosion resistance, high and low temperature resistance, the shell can withstand pressure, have sufficient strength and stiffness, PTFE Board Lining Process Equipment can reduce the overall cost. PTFE lining anti-corrosion products in addition to chemical, petrochemical, oil refining, pharmaceutical, metallurgical and other fields have been widely used in the electrical and electronic aspects are often used. At present, these products are lining pipes, pipe fittings, towers, kettle, containers, pumps and valves. Polytetrafluoroethylene (PTFE) with its excellent resistance to high and low temperature performance and chemical stability, good electrical insulation properties, non-adhesive, weather resistance, flame resistance and good self-lubricating, has been in the chemical, , Textile, electrical and electronic, medical, mechanical and other fields have been widely used.
In the fluorine plastic polytetrafluoroethylene (PTFE) the largest consumption, the most widely used, is an important species in fluorine plastic. PTFE has excellent resistance to high and low temperature performance and chemical stability, good electrical insulation properties, non-sticky, weather resistance, PTFE Board Lining Process Equipment flame resistance and good self-lubricating, "plastic king" reputation. The material was first developed for national defense and cutting-edge technology needs, and then gradually extended to civilian use, its use involves many aspects of aerospace and civilian, is currently in its application areas has become an indispensable material.
Performance characteristics of PTFE
PTFE is a polymer made from tetrafluoroethylene monomer, which is a transparent or opaque wax similar to PE with a density of 2.2 g / cm3 and a water absorption of less than 0.01%. Its chemical structure is similar to PE, except that all of the hydrogen atoms in the polyethylene are replaced by fluorine atoms. PTFE Board Lining Process Equipment Since the CF bond is high and the performance is stable, it is excellent in chemical resistance and can withstand all strong acids (including aqua regia) other than molten alkali metal, fluorinated medium and sodium hydroxide higher than 300 ° C, As well as the role of strong oxidants, reducing agents and various organic solvents; PTFE atoms in the F atom symmetry, CF bond in the two elements covalently bonded, there is no free electrons in the molecule, so that the whole molecule was neutral, so it has Excellent dielectric properties, PTFE Board Lining Process Equipment and its electrical insulation from the environment and frequency. Its volume resistance is greater than 1017 mm, dielectric loss is small, high breakdown voltage, PTFE Board Lining Process Equipment good arc resistance, can work in the 250 ℃ electrical environment for a long time; because PTFE molecular structure without hydrogen bonds, structural symmetry, so it (The general crystallinity of 55% to 75%, sometimes up to 94%), so that PTFE heat resistance is excellent, the melting temperature of 324 ℃, decomposition temperature of 415 ℃, the maximum temperature of 250 ℃, The brittle temperature was -190 ° C and the heat distortion temperature (0.46 MPa) was 120 ° C.