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[en] The long term-durability and the soundness of the plastic pipe have been sufficiently verified through use of the plastic pipe during the past several decades. Recently, as the pipe material have been constantly developed, the application of the plastic pipe is expanded to various industrial fields, such as an increase of a use pressure, the bigger diameter of the pipe, etc. In a nuclear power plant where a carbon steel pipe and a stainless steel pipe are mainly used as a safety class III buried pipe, safety in an operation is seriously threatened by abrasion, heat deterioration or the like, frequently generated in a metal pipe. Therefore, in order to provide an alternate to this problem there is a rising interest on using high-density polyethylene (HDPE) pipes which are known to provide much enhanced corrosion, abrasion and impact resistant properties. With polyethylene piping, one of the issue that is being looked into is the integrity of butt-fusion joint. At the present time the Referencing Code and Standard for the NDT technology of for butt fusion joint of the plastic pipe have not yet established. An optimum inspection parameters were determined according to the thickness of the HDPE pipe. It was also confirmed that most of the detection results of two techniques have matched with each other. In the PAUT, it is easy to distinguish signals with from the flaws made by the thin plate and the void. Also the resolving power of PAUT on the detection in the depth direction has been demonstrated to be satisfactory
[en] This study verifies the validation of microwave testing used in the efficient detection of cold fusion on the butt fusion joints of high density polyethylene(HDPE) pipes. The characteristics of HDPE materials, butt fusion joints, and cold fusion, as well as the principles of the microwave testing technique are all described in detail. The PE4710-based cold and sound fusion pipe specimens with diameters of 110mmare fabricated. After microwave technology testing for the specimens is conducted, destructive testing is performed and the test results are discussed
[en] Like the phase array based ultrasonic system, complicated electronics has been used for real time signal processing in the magnetostrictive long-range ultrasonic testing(LRUT) system. This study shows that the software approach including the phase compensation, noise filtering and waveform transformation takes advantage rather than the previous hardware approach. Furthermore, it is possible for the software approach to be able more flexible and efficient realtime signal processing. These results will contribute to a cost-effective LRUT system and analysis of the inspection data.
[en] Electrospinning was employed to prepare new multi-functional nanowebs. Cyclodextrin based inclusion complex (CD-IC) was used to disperse multiwalled carbon nanotubes (MWNT) within electrospun polyvinylidene fluoride nanofibrous membranes (PVdF-NFM). Subsequently, MWNT(CD-IC)/PVdF-NFM was loaded with gold (Au) particles. The morphology, structure and thermal properties of Au/MWNT(CD-IC)/PVdF-NFM were investigated by transmission electron microscopy, field emission scanning electron microscopy, FT-IR spectroscopy, x-ray diffraction spectroscopy and differential scanning calorimetry. The new Au/MWNT(CD-IC)/PVdF-NFM is electroactive and shows excellent electrocatalytic activity towards oxidation of ascorbic acid.
[en] In this study, a microwave reflection technique was used to detect an abnormal joint in a polyethylene pipe. The polyethylene pipe specimens were fabricated at different welding times; the outer diameter and length or the specimens were 350 mm and 245 mm, respectively. Experimental microwave equipment was organized to transmit and receive the microwave signals at the weld joint parts of polyethylene pipe specimens at frequencies ranging from 12.4 to 18 GHz. The abnormal joint of polyethylene pipe specimens could be fully separated at 13.1 GHz and a linear relationship between the width of bead at polyethylene pipe and microwave reflection signal was found. Consequently, non-contact evaluation of the weld joint part of polyethylene pipes can be possible using the proposed microwave reflection technique