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首页> 外文会议>International Conference on Computer Technology in Welding and Manufacturing >NUMERICAL SUBSTANTIATION OF MAXIMUM PRESSURE IN PNEUMATIC-AQUARIUM METHOD OF TESTING THE TIGHTNESS OF HEAT EXCHANGE TUBES AND THEIR WELDED JOINTS OF THE PGV-1000M STEAM GENERATOR
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NUMERICAL SUBSTANTIATION OF MAXIMUM PRESSURE IN PNEUMATIC-AQUARIUM METHOD OF TESTING THE TIGHTNESS OF HEAT EXCHANGE TUBES AND THEIR WELDED JOINTS OF THE PGV-1000M STEAM GENERATOR

机译：用于测试热交换管的紧密性的气动水族箱方法中最大压力的数值实质及其PGV-1000M蒸汽发生器焊接接头

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摘要

State-of-the-art detection of air-tightness failure (leakages) in heat-exchange tubes and welded joints, by which they are welded to the tube plate (a header body) of steam generators of big power plants, is urgent task of state-of-the-art nuclear power engineering, in which high-power steam generators are used with respectively high number of heat-exchange tubes. For example, PGV-1000M generator contains 11 ths tubes and, respectively, 22 ths welded joints. Pneumatic-aquarium method for detecting leakages by means of air pressure in the steam generator body and registration of air bubbles in the header filled with water up to a respective level is sufficiently efficient method, whereby by means of the test air pressure increase, efficiency of the method significantly increases. However, risk of failure of welded joints, by which welded tubes are attached to the header body, also increases. These are slit-type connections with a weld located in the apex of a slit. Test pressure in contrast to the working pressure opens such slits thus, naturally, enabling efficient detection of defects (leakages) in a welded joint. However, this causes risk of integrity violation of, in general, rather serviceable joints. Numerical study carried out on order of NAEC of Ukraine allowed establishing upper limit of the test pressure on the basis of state-of-the-art approaches of destruction mechanics allowing for residual weld stresses and variation of geometric sizes of welds because of operation wear.
机译：通用通讯管中的气密故障（泄漏）的最先进的检测，其焊接到大电厂蒸汽发生器的管板（带状物）焊接到管板（漏极机构）是紧迫的任务最先进的核电工程，其中高功率蒸汽发生器分别具有大量的热交换管。例如，PGV-1000M发生器分别包含11个THS管，分别为22个焊接接头。气动水族箱方法，用于通过蒸汽发生器体内的空气压力检测泄漏的方法，以及填充水的空气气泡的登记到相应的水平是足够有效的方法，由此通过试验空气压力增加，效率该方法显着增加。然而，焊接接头失效的风险，焊接管通过该焊接管连接到集管体内，也增加。这些是与位于狭缝顶点中的焊缝的狭缝型连接。与工作压力形成对比的测试压力因此，自然地打开这种狭缝，从而能够有效地检测焊接接头中的缺陷（泄漏）。然而，这导致诚信违反的风险，一般是一种相当维护的关节。根据乌克兰的NAEC顺序进行数值研究，允许在最先进的破坏力学方法的基础上建立测试压力的上限，允许由于操作磨损而允许焊接的残余焊接应力和几何尺寸的变化。

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