Dozór Techniczny (Technical Supervision) 2018/04

  • Failure of the refrigeration system part II. Qualification of the event. Leak or explosion?
    The first part of the article (Technical Inspection No. 3/2018) describes the procedure used in determining the causes of failure in a fruit cooler, which consisted of a sudden unsealing of the ammonia refrigeration plant. An entire list of welding incompatibilities was detected. A separate issue in the described case was the resolution of the dispute over whether the event should be classified as a leak or an explosion. This issue is discussed in more detail in the second part. The decision of the insurer about the possible payment of compensation often depends on the answer to this question.
  • German experts are alarming: every seventh lift is dangerous. And in Poland?
    At the end of May, the German Association for Technical Inspection informed that after the inspections of lifts operated in Germany carried out in 2017, it turned out that one-seventh of cranes had serious drawbacks. Therefore, the inspectors ordered the suspension of the operation of almost 2,000 cranes throughout the country. Can we face a similar problem in Poland as in our western neighbor?
  • Problems in welding penetration at the distance of metals and ceramics using a device to connect the robot with the motion sensor welding trainer
    In order to perform welding of conductive ceramic, titanium alloys in a room filled with argon or remelting under water, the robot should be connected with the trenazer motion sensor and the boundaries of the weld pool should be applied using computer image processing to the film frames of the robot camera. To enable reprocessing of the remelting by means of a robot, based on the physics of melting the metal, the welding algorithms for smelting the pierce with methods 111, 131, 135, 136, 138 and 141 were discussed.
  • Non-destructive testing of historic buildings
    Historic and historical objects play an important role in the development of civilization. Numerous items are collected in museums and by private collectors, and the value of these items is constantly growing. Non-destructive testing has been successfully applied to these objects for many years. The goal of non-destructive historic buildings (NDT) is to provide knowledge about the technical condition of facilities, which facilitates decision-making about maintenance activities, defining the time and place of creating the object and sometimes its author, detection of falsification, type of artistic materials used, trade routes, historic value. Knowledge gained as a result of NDT is usually used to determine the type and scope of maintenance works leading to the slowing down of the degradation process. The most commonly used are visual, radiographic, ultrasound, infrared thermographic and X-ray fluorescence methods.

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