|Mode Of Report||Hard Copy|
|Testing Service Level||With Certificates|
|Customer/Business Type||Customer Requirement|
|Test Interval||One Time Requirement|
High temperature pressure pipelines are extensively used in petrochemical plant and power station. The leakage and explosion accidents often take placed after a certain period of time because of media corrosion, cavitation erosion, welding defects cracking, stress corrosion cracking and materials deterioration. According to the statistic of large number of pipe leakage accidents, media corrosion and cavitation erosion is the main reasons lead to leakage and explosion accidents. The ratio is larger than 50% of the total accidents. In order to insure the safety operation of the pipes, it is necessary to search for some good NDT methods to assess wall thickness and then replace only critically damaged pipes. X-rays (or g-rays), ultrasonics, and infrared thermography are useful for such purposes. Due to infrared thermography test possess the advantages of being noncontact, fast, harmless, useful for either the reflective or transmissive method, and easy to deloy, it has the potential to test the pits and wall loss defects on-line for high temperature pressure pipes.
High temperature pressure pipelines are extensively used in petrochemical plant and power station. The pits or wall loss defects can be severely internally produced after a certain period of time due to media corrosion and cavitation erosion. These defects finally lead to leakage of the pipes. In order to search for a good non-destructive method for these defects, a big pipe testing installation was constructed. A serious of infrared thermography testing experiments were performed for 4 kinds of stainless steel and carbon steel pipes which are drilled different size holes on inner-surface. The testing results show that infrared thermography test is a very suitable method for non-destructive test of corrosion pits and wall loss defects of high temperature pressure pipes. The corrosion pits or wall loss defects that size are bigger than F10mmX40% wall thickness can be detected by infrared thermography test. The testing sensitivity satisfies the requirements of pipe safety operation.
Keywords: High temperature; Pressure pipe; Pipe, Infrared thermography test; Infrared test.