Abstract
The fuel and energy complex (FEC) is a basis for the development for all the branches of the Russian economy. An unified gas supply system, as the network of trunk pipelines and gas distribution networks, is an important link of FEC. Gas pipeline transportation takes the first place with respect to other means of transport because of the remoteness of gas consumers from gas fields, since only pipeline can provide a uniform and continues supply of significant quantities of gas at minimum economic cost. The optimal mode of operation of the main gas pipeline is to maximize the use of their delivery with minimum energy consumption for gas compression and transportation of natural gas through the pipeline. To carry out a regular transportation of gas at specified volume, according to the system of gas main transport, normalization and planning of regimes and plans of switching on gas transfer units is realized, and with that the possibility is forseen of providing necessary reserve of units. The purpose of this paper is to study various plans of redundancy - on the example of stationary type units - from the point of view of theory of reliability of equipment maintenance. On the base of this study it is established that the active redundancy is the most reliable, but redundancy is the most reliable, but redundancy with reduction ratio is the least one. With little operating time the gain of reliability increases considerably with the rise of redundancy multipleness. The gain of reliability, according to the probability, according to as greater as the failure rate of non redundant system is smaller. That is, for increasing the reliability it is necessary to increase redundancy multipleness. But with the rise of the operating time, beginning wing with 5000 hours, the redun - dancy multipleness does not influence the rise of reliability in that case it is necessary to make higher demands of preventive maintenance of Gas Transfer Units.
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