Search Results for current

...INTRODUCTION The purpose of this procedure is to investigate the possibility of basic direct current (DC) stray current interference on underground or submerged structures. Complex dynamic interference problems such as those encountered in transit system operations are not included...

.... INTRODUCTION The primary causal factor for what is highlighted above and any similar behavior resides in our current economic model, driven by greed and its inherent linearity, as it is based on the concept of producing-using-disposing and repeating the process again and again. The process is often supported...

...Rectifiers are used more than any other source of impressed-current power. Areas discussed include rectifier types, rectifier selection, specification requirements, and typical installation details. Various types of impressed-current anodes and components that make up an impressed-current system...

...The major emphasis of the preceding chapters has been on corrosion and the use of corrosion-control methods to combat it successfully. The stray currents associated with pipeline corrosion problems are, as the designation implies, direct currents flowing in the earth from a source other than...

...INTRODUCTION The purpose of this procedure is to measure direct current (DC) in an electrical circuit related to cathodic protection (CP). DC measurements may be made by an ammeter or a clamp-on ammeter or calculated by measuring a millivolt drop across a shunt or known resistance. In CP, current...

... is to first determine if the cause of low CP levels can be eliminated and, if not, what additional current is required, in addition to how and where it can be applied. The CP technician must have a good understanding of the criteria as well as the special conditions and precautionary notes that apply...

...INTRODUCTION Stray alternating current (AC) on structures is a safety concern, and at high AC current densities, corrosion can also be a concern. Any person coming in contact with a structure that may have a hazardous AC voltage must be aware of these hazards and the safety precautions that need...