STRAY CURRENT STING ON GAS DISTRIBUTION PIPING FOLLOWING START-UP OF A NEW LIGHT RAIL TRANSIT LINE

摘要

The light rail transit system in Minneapolis, Minnesota began revenue operation on June 28, 2004. The LRT system is state-of the art, with stray current being well controlled at the source. This paper is a follow on to Paper 03711 (Corrosion 2003) which described the precautions taken by the LRT and the testing facilities and other preparations made by the gas company prior to and during LRT construction. Initial data on pipe to soil potentials and pipeline current flow to evaluate stray current effects are presented. To date, no adverse reactions due to the operation of the LRT system are evident at points tested on the gas piping.