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P141 GAS PIPELINE ELECTROMAGNETIC FIELD RESEARCHES 1 Summary There have been done plenty of theoretical experimental (lab and field) researches of main pipeline cathode current protection electromagnetic fields (P.C.C.P.E.F.) at Ukhta State Technical University. Thus underground pipeline system geophysical monitoring methods were scientifically proved and significantly improved by processed data obtained through the researches have been done. Using these methods the following essential tasks could be solved: plan and cut pipeline location; in time forced pipeline bends and various infringements reveal; dangerous (potentially) and most responsible main pipeline sites (located at water barrier highway and railway crossings) survey; mapping of