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Underground gas storage in Slovakia has a 25 years history. The first phase of building, the object for underground reservoir Láb began in 1977. The underground reservoir is separated into five independent parts, phases of building. All parts are concentrated in central control area. The oldest part of equipment for underground reservoir needs overhaul and maintenance today. The maintenance process uncovers a lot of problems that were created through building process. The great problems are uncovered in the area of pipeline system diagnostics. In the past, maintenance operators faced difficult decisions, to choose the best method or combination of methods to evaluate pipeline condition.