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The paper gives the results of acoustic emission (AE) evaluation during pneumatic testing of pressure vessels in air distribution station at Odesa Portside Plant. It is shown that application of AE testing and respective equipment allowed evaluation of technical condition of the tested objects, as well as taking into account the special features of testing performance, in order to improve the methodological approaches to generation and processing of data of complex structure AE diagnostics. [ABSTRACT FROM AUTHOR]

Application of acoustic emission testing method and technical diagnostics systems of EMA family in critical industrial facilities allowed not only quickly obtaining information on their technical condition, but also improving the methodological approaches to data processing, based on the derived data, as well as control equipment and its software. This paper presents the results of the conducted analysis of the problem of filtering and optimal parameters of AE data clustering and verifying the effectiveness of the selected clustering methods on samples and structure elements. 5 Ref., 17 Fig. [ABSTRACT FROM AUTHOR]

17G1S steel is widely used in pipelines. Change in the physical properties of this material with time depends on the conditions of gas pipeline operation and pipe environment. Material damage due to operating time by far not always leads to a change of such standard characteristics of the material as σt, σy, К1С and a number of others. At the same time, such material can be significantly damaged, but the traditional methods do not allow determining it. The objective of this work is to demonstrate the sensitivity of acoustic emission method to changes in 17G1S steel properties after 15 years of the main gas pipeline operation. Testing results show that the analyzed acoustic emission parameters change essentially under the impact of operating time, and they can be the characteristics for evaluation of the current state of the damaged material. [ABSTRACT FROM AUTHOR]

Copyright of Technical Diagnostics & Nondestructive Testing / Tekhnicheskaya Diagnostika I Nerazrushayushchiy Kontrol is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ensuring trouble-free operation of structures and constructions is an extremely important and urgent task. That is why scientists pay a lot of attention to development of new methods, equipment and procedural materials for their implementation in industry. Particular attention is given to the state of material of the structures and constructions for timely decision taking and avoiding accidents or emergencies. Investigation of changes of acoustic emission (AE) parameters at different stages of testing material samples is conducted. Development of approaches to analysis of the distribution of AE event parameters is presented in the work. Informative parameters the distributions of which need to be studied, were tentatively determined, proceeding from analysis of the data of numerous investigations of different materials. Developed algorithms and determined means for setting up analysis of distribution of AE event parameters were introduced into the working part and visual interface of EMA-3.92 program. It is established that changes of AE parameters have certain regularities which is demonstrated by the results of testing samples from 17GS steel, and they can be used for assessment of the state of materials, when performing AE control and monitoring. Ref. 15, Tabl. 1, Fig. 11. [ABSTRACT FROM AUTHOR]

The paper gives the results of application of AE method in the case of monitoring and control of ammonia storage facilities in ammonia reloading shop, individual lines and apparatuses in ammonia production shop, and well as objects of air distribution station in water treatment shop. It is shown that the results of AE monitoring can be used at qualitative assessment of the state of thermal insulation coating. Schemes of AE transducer mounting on the object of AE monitoring and location array configurations are given. Selective results of AE monitoring of these facilities for the current year are given. 8 Ref., 8 Tabl., 15 Fig. [ABSTRACT FROM AUTHOR]

The majority of existing structures contain welded joints. Questions of monitoring service characteristics of welded joints, using acoustic emission method are considered. Attention is given to a change in material properties of operating structures with welded elements after long-term service, taking into account the time and probable violation of service conditions. Examples of evaluation of the change in properties of welded structure materials by the data of acoustic emission, determination of their damage and residual service life, are given. 17 Ref., 5 Tabl., 24 Fig. [ABSTRACT FROM AUTHOR]

Copyright of Technical Diagnostics & Nondestructive Testing / Tekhnicheskaya Diagnostika I Nerazrushayushchiy Kontrol is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The paper present generalized results of application of continuous acoustic-emission monitoring systems after upgrading the equipment and respective software in high-temperature components of power generating equipment, and potentially hazardous facilities of chemical industry that will promote their reliable accident-free operation. 14 Ref., 14 Fig. [ABSTRACT FROM AUTHOR]

Conducted investigations were the base to formulate a hypothesis, which shows that acoustic emission is a mirror reflection, and, therefore, an acoustic certificate of material characteristics that change in operation, and, in particular, of their mechanical properties. Use of this hypothesis was verified in practice and allows prediction of breaking loading of the material without interrupting the object service and without the need to have prior knowledge of initial values of mechanical properties of the materials. In keeping with the presented hypothesis, AE reflects not the properties of the material proper, but their change, and it automatically adapts to such changes, irrespective of material type. Experiments, conducted with numerous materials, differing by their physical characteristics, including steels of different classes, aluminium alloys, concretes and composites, showed that limit breaking load of these materials by AE data is determined by the same algorithm with an error related just to the technical features of the measurement instruments. Accumulated experience allowed moving over to creation of an intelligent technology for assessment of structure material state in operation, and of AE systems based on it. Such systems have already become widely used at continuous monitoring of the state of the structure in production environment. 10 Ref., 8 Fig. [ABSTRACT FROM AUTHOR]

09G2S, 14KhGS steels and steel 20 are on the list of those the most widely applied for building structure fabrication. The majority of gas pipelines are also made exactly from these steels. Changing the properties of these materials under diverse operating conditions, taking into account the time and violation of operating conditions, is of considerable interest. Investigations show that the environment and operating conditions, as well as the product transported by the pipeline, have a quite significant role in the change of their properties over time. A technology based on acoustic emission, can help reveal the finest service properties of these materials. Investigations presented below are devoted to AE application for these purposes. 15 Ref., 5 Fig. [ABSTRACT FROM AUTHOR]

Copyright of Technical Diagnostics & Nondestructive Testing / Tekhnicheskaya Diagnostika I Nerazrushayushchiy Kontrol is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)