The condenser copper pipe 'before testing experience is introduced

Abstract: before detection of condenser copper pipe service experience to introduce information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Unit in the operation of the water quality deterioration because most of the steel tube rupture or perforation caused by circulating water into the steam leakage side, severe cases will cause massive scale, the boiler heating surface pavilion leakage caused bulge, yunfu power plant unit no. 1 in 1994 cold wall area of the bulge. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the condenser copper pipe 'before testing experience introduction for details. Unit in the operation of the water quality deterioration because most of the steel tube rupture or perforation caused by circulating water into the steam leakage side, severe cases will cause massive scale, the boiler heating surface pavilion leakage caused bulge, yunfu power plant unit no. 1 in 1994 cold wall area bulge spill at the root of the condenser copper pipe is leaking. The main cause of condenser copper pipe leakage has two aspects: one, is a new copper tube itself there are quality problems. Second, the circulating water quality. Good control of the newly installed copper tube quality is an important means of preventing early condenser leakage. 'To prevent power production major accident 20 key requirements to prevent large capacity boiler pressure parts involved in the context of the exposure, condenser copper pipe also explicitly required to full inspection before inspection. 1 copper pipe production process. 1 the pipe production process of the production process: copper billet & ndash; Extrusion & ndash; Rough & ndash; Straightening & ndash; Pure la & ndash; Cutting & ndash; Eddy current testing & ndash; Heat treatment & ndash; Ammonia smoked, mechanical performance test & ndash; The finished product packing. 1. 2 eddy current testing technology of eddy current detection technology has the following kinds: a) Test equipment - A Scanning eddy current flaw detector, mechanical transmission, through the coil. b） Detection frequency & phi; 25毫米× HSn70-1 mm 1 brass tube choose 24 KHZ frequency; φ 25毫米× BFe10-1 mm 1 - 1 white brass tube with 35 KHZ testing frequency. c) Standard sample size for & phi; 0. A standard set of 8 mm hole, each group of three circular uniform sampling. d） The transmission speed of 1. 5m/s。 e) End the delay time is 0. 2s。 f) Process standards GB5248 & ndash; 85 copper and copper alloy seamless tube eddy current flaw detection method. 1. 3 ammonia fume, the mechanical properties testing and eddy current testing results HSn70 - 1 brass tube ammonia fume test are qualified. Copper tube flaring, flattening, tensile test data in line with the GB8890 & ndash; 88 the copper alloy tubes for heat exchanger in the technical requirements. HSn70- 1 brass tube eddy current testing qualified rate between 60% ~ 70%, BFe10 - 1 - 1 cupronickel tube eddy current testing qualified rate is between 40% ~ 50%. The influencing factors on the quality of the product 2. 1 the timing of the eddy current testing process, the eddy current testing is arranged before heat treatment, there are good reasons why this arrangement, copper production yield is not high, if arranged in after heat treatment, is bound to increase the heat treatment equipment, working hours and cost, but the arrangement program is unfavorable for copper tube quality control, the stage of completion of the heat treatment after eddy current testing defects such as cracks, overheating of the copper pipe cannot be selected. Yunfu power plant unit 1 condenser copper pipe to replace, before the installation of eddy current testing found six copper pipe crack, the factory technical personnel analysis, explanation for copper tube produce very big internal stress in the process of drawing, heat treatment is designed to eliminate internal stress increase the elongation, but not as good as or improper heat treatment technology, heat treatment of micro cracks that itself has copper pipe under the action of internal stress may be craze. 2. 2 eddy current testing equipment with the development of the eddy current testing technology, the impedance plane graph analysis method commonly used eddy current testing instrument. Manufacturer of eddy current testing equipment is to use A minus Scanning analysis, eddy current on the screen, according to the detected defect signal for one dimensional and eddy current field of probe coil impedance is a vector, including the change of the resistance and reactance components, namely the amplitude and phase Angle is two-dimensional information two variation. When eddy current field after the defects in different depth from surface position, has the different modulus and phase produce eddy current signals, it is obvious that one dimensional display ills is harmless, Shallow and large area) Defects will produce large signal, so dangerous ( Deep and small area) Defects will produce small signal, so harmful defects because of its small area and targets.

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