射孔套管应力集中系数有限元分析

建立了射孔套管的有限元力学模型，对不同孔径、孔密及相位角的射孔套管在外挤压力作用下的孔眼应力集中系数进行了有限元分析。旨在讨论非线性材料弹塑性范围内多孔情况下，对孔眼的应力集中系数及对管体抗挤强度的影响，为射孔套管应力集中及强度影响提供了详尽的数据，并给出了优化射孔方案。     

对国产300MW汽轮机组采用中压缸启动技术的探讨

针对早期的东方汽轮机厂制造的 30 0MW机组的结构和运行特点 ,综合分析了影响其采用中压缸启动方式的主要因素和采用中压缸启动方式的优点 ,并对中压缸启动方式的参数和操作要领进行了简要的说明。     

薄壁黄铜天线套管成型的试验研究

介绍了开发研制薄壁黄铜小直径天线套管的拉伸工艺及理论，并对拉伸断裂的塑性变形理论进行了分析探讨，进而对游动芯头拉伸与应用，提出工艺改进和提高管材表面质量的措施。     

制造误差,丝扣联接对油井套管强度影响的有限元分析

对油井套管来说，应考虑制造误差对强度产生的影响以及套管与套管之间的丝扣联接部分的强度问题。本文利用有限元法对存在制造误差的油井套管进行了应力分析，并对套管与套管之间的丝扣联接部分进行了应力分析，编制了数值计算软件，指出了应力提高系数、屈服过程，为套管设计提供了依据。     

浅析电流互感器二次接线存在的问题

文章分析了二次绕组带有抽头的套管电流互感器(CT)，其二次端子接线错误对CT变比的影响。指出在实际工作当中应当正确理解“CT二次线圈严禁开路”所指含义，灵活应用，以保证保护装置可靠动作。     

长庆油田渗氮套管的耐腐蚀性能研究

针对长庆油田油井套管腐蚀问题,采用并评价了真空渗氮工艺.该工艺处理套管表面形成氮化层,在不降低原有机械性能的前提下提高了表面耐磨、抗蚀能力.经室内、现场试验发现,渗氮管在长庆油井腐蚀情况下的耐腐蚀性能优良.此外,还就渗氮层在不同弯曲、拉应力条件下的微观表面变化对使用性能的影响进行了研究,确定了渗氮套管下井条件.并于2003年首次在2口井得以应用.该工艺为低产低渗透油田的防腐蚀研究提供了新思路.     

蒸发器母液循环泵、过料泵泵壳泄漏分析及对策

介绍我公司氧化铝厂KESTNER蒸发器母液循环泵、过料泵泵壳的泄漏情况 ,分析泄漏原因 ,提出相应的改进措施     

数值仿真技术在石油套管制造中应用的展望

介绍了数值仿真技术在石油套管制造中的应用。通过石油套管制造过程的模拟仿真，可以在设计阶段发现潜在的问题，降低原材料成本，优化产品制造工艺，缩短产品研制周期，加快产品投向市场的步伐，增加产品的质量和可靠性。为石油套管制造工艺由经验制订向理论制订的转变奠定坚实的基础，提高石油套管产品的技术含量，增强国际竞争能力。     

Characterisation and quantification of defects in rotors and casings of steam turbines

The loading situation of components in modern fossil-fired power plants is characterised by higher cyclic service in comparison to older plants. This leads in combination with larger units to increased stresses in the relevant components. To evaluate the risk of failure due to natural defects, life time approaches have been developed on the basis of advanced methods of fracture mechanics. The assessment of natural defects using fracture mechanics is, however, based on the following preconditions: ? knowledge and data on the behaviour of such defects in terms of damage mechanism taking into account crack initiation and crack propagation under loading situations comparable to those in service,

? data on the real size and geometry of defects,

? data on the exact location of the defects.

To create such a database an extensive joint research programme was started in the early eighties by German turbine manufacturers, steel makers and research institutes. The paper provides an overview of the results of these efforts. Special emphasis is placed on describing the improvements in ultrasonic testing techniques. The results of feature tests are reported. They have been performed to obtain information and data on the behaviour of natural defects under creep, creep fatigue and fatigue load. Subsequent metallographic investigations determine the real size and location of the defects but also the relevant damage mechanisms. Comparison of metallographic data and NDT data prove the reliability of ultrasonic testing. Thus an improved rating of the permissible ultrasonic indications in turbines and castings was obtained.     

汽轮机高中压外缸水压试验浅析

在汽轮机的制造过程中,为了确保产品(如高中压外缸)能安全运行,通常需要使用水压试验的方法对主要承压产品进行检测。水压试验的要求高于产品设计要求,其结果将作为承压产品是否合格的重要依据。