Source: Bulgartransgas EAD - DVGW

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Maintenance of Gas Networks Reliability of gas supply is the property of the gas supply system to deliver the required natural gas volume to the consumers uninterrupted, under the contract terms, in compliance with pre-set working parameters and within a certain time frame. The gas supply reliability rate is: determined in the concept project; underlying the working projects, the procurement of materials and equipment, the implementation and control of construction works and commissioning; maintained in the course of the system operation and restoration during implementation of restoration-repair works. Bulgartransgaz <strong>EAD</strong> and Overgas Inc. subsidiaries use SCADA system. SCADA serves to monitor the network pressure and flows, the natural gas composition and specific burning heat, the condition of the stop and control valves, the parameters of the devices. The data transfer is made through optic cable lines, telephone lines, satellite and radio connectivity. SCADA uses logic modeling programs, electronic equipment and standardization of computing networks.
Maintenance of Gas Networks Operation of the gas network is run in compliance with the gas companies’ procedures and instructions which are part of the Quality Management System under BSS (Bulgarian State Standard) ISO 9000-2008, BSS EN 12007-1,4 and other standards of TC-234-Gas Supply - CEN. Practices based on the <strong>DVGW</strong> documents and experience are also applied. The gas companies generate, maintain and store the operation documentation in the format and volume in compliance with the statutory requirements during the complete operational period of the energy sites. Part of the documentation is stored electronically. The documentation contains the following minimum volume of: acts of approval and commissioning; executive documentation of the gas pipelines and facilities; underground cadastre in the area of the gas pipe line; technical passports of the gas pipelines valves and facilities (files including description of the check-ups and repairs made); operational log of the dispatch center; action plan in case of emergency and emergency-restoration works; procedure of leak detection.
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Source: Bulgartransgas EAD - DVGW

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