24-hour characteristic of interaction on pipelines of stray currents leaking from tram tractions

Methods described in the literature have been presented for determination o f the corrosion hazard caused by stray currents. 24-h characteristics have been presented of interaction with pipelines of randomly changing stray cur rents leaking out of tram tractions. Results have been obtained by applying the correlation method of investigating stray currents, in which the asymm etry coefficient value of pipeline potential changes in relation to the sta tionary potential was used as the electrolytic corrosion hazard criterion. The presented characteristics were obtained on the basis of short-term meas urement results lasting 30 min, performed consecutively one after each othe r during 24 h. The presented results can be used for long-term prognosis of the electrolytic corrosion hazard to pipelines on the basis of short-term measurements. (C) 1999 Elsevier Science Ltd. All rights reserved.