RELIABILITY OF THERMAL NETWORKS: THEORY AND PRACTICE

According to research, the total number of accidents on thermal networks which is related to exceeding the normative operation period has increased in the last two years. Obsolete networks lead to signifi cant heat losses. Energy effi ciency of heat supply can be increased with improvement of the reliability of thermal networks. When the federal law No. FZ-190 «On heat supply» was introduced, diagrams of heat supply of settlements began to be developed again. Calculation of heat supply reliability became an obligatory requirement. Methods of calculation of thermal networks reliability are provided in most detail in [1, 2]. The [2] technique suggests calculating reliability in the ZuluThermo software complex. The main basic parameter for calculation is the average failure rate. This value is theoretically the result of statistical investigations, and on practice uses the average value. Absence or lack of statistical information leads to a change in the actual reliability index, bringing it closer to the target value. A technique for collection and processing of failure statistics is suggested in [1]. However, for a number of reasons, there are certain diffi culties of receiving reliable basic data. Besides, as practice shows, data processing and assessment of the results also causes diffi culties. The results of the critical analysis of the listed techniques has shown that in order to receive calculations which are true it is necessary to have an up-to-date database on failures. What is new is that the principles of gathering the failure statistics and infl uence of real basic data on the actual reliability value are studied. It is revealed that formation of a database on failures in thermal networks will have a positive impact on promoting the reliability theory among specialists of the heat supplying organizations and operators, will minimize possible deviations of calculated reliability values, will allow to predict the development of heat supply systems in general and to prevent possible cascade damages of the vital power supply systems.

1. Ionin A. A. Reliability of systems of thermal networks. – M.: Stroyizdat, 1989. – 265 pages.

2. Sennova E. V., Kiryukhin S. N., Shimanskaya A. O. Metodologiya and an algorithm of calculation of indicators of reliability of heat supply of consumers and reservation of thermal networks when developing schemes of heat supply the Heat Supply News Magazine, http://www. ntsn.ru/

3. http://www.rosteplo.ru/soc/blog/ohtpersonal/2049.html

4. Bogatkin V. I., Vankov Yu. V., Mazayev N. I. Basic provisions of creation of the scheme of heat supply города. // Power industry of Tatarstan. No. 1, 2014, page 6 – 9.

5. The federal law of July 27, 2010 No. 190-FZ «About heat supply».

6. Calculation of reliability of system of heat supply of https://www. politerm.com/zuluthermo/help/reliability.htm

7. Gorbunova T. G., Vankov Yu. V., Ziganshin Sh. G. Infl uence of reliability of thermal networks on a funktsionirvoaniye of engineering systems // News teplosnabzheniya. 2012. – No. 10 (October). – page 30 – 35.

8. Vankov Yu. V., Gorbunova T. G., Bogatkin V. I., Ucharov U. B. Ensuring reliability of thermal networks at design of new objects, reconstruction and architectural supervision // Power industry of Tatarstan. – 2011. – No. 4 (24). – page 52 – 55.

9. Methodical recommendations about development of schemes of heat supply (are approved by the joint order of the Ministry of Energy of the Russian Federation and the Ministry of Regional Development of the Russian Federation from 12/29/2012 No. 565/667).

10. Dmitriyev A. Use of indicators of reliability in management of the system of city heat supply // Municipal government. 1999. – No. 12. – Page 73 – 77.