... rate of 0.36 mm/yr. Abstract A 2018 field investigation on an NPS 6, approximately 4 km long, liquid pipeline, identified a rectifier as the likely source of the elevated DC and AC current densities, which resulted in AC corrosion anomalies detected during in-line inspections (ILI). The findings...

... of the elevated AC current densities and quantify the associated corrosion risk. The mitigation strategy employed to address this risk is provided. AC Corrosion AC Interference AC Mitigation Cathodic Protection CP Ground Bed Rectifier Interference Unfiltered Rectifier Corrosion Investigation Pipeline...

... to provide protective currents, but others require a power source in order to make the anodes corrode. These systems use rectifiers and rectifiers can breakdown. A well maintained rectifier provides uninterrupted cathodic protection, reduces repair costs and labor/technician time. This paper discusses...

... their needs. Additional factors that must be taken into consideration depending on need include security offerings, multiple pipe-to-soils, multiple rectifier monitoring capabilities and A/C signal interference detection. Today there are wireless data radios on the market that address and streamline...

...Metering Abstract Rectifier safety has recently become an industry concern for cathodic protection technicians and personnel who are responsible for rectifier operation, maintenance and repair. While rectifiers are manufactured according to national electrical codes and standards and inspected...

... shown in Figure 4 . First, the ratio of utility voltage to rectifier output voltage holds reasonably steady at about 2.50, showing that the output does track the input. The calculated resistance (Rectifier Output Volts / Rectifier Output Current) is in the neighborhood of 9 ohms. While there is some...

... employing distilled water and sterile syringes were used to extract samples and inoculate the vials. All tests resulted negative for MIC. A CP system consisting of 25 vertical graphite anodes and low resistivity coke backfill anode bed, and a 100V X 100A rectifier were installed at the position marked...

... to these risks with respect to the new CP criteria, a new hand-held instrument that enables the simultaneous measurement of DC and AC current densities in the field was developed. The risk of rectifier failure due to lightning surge and the aging of ground beds is also increasing. An on-line surveillance system...

... protection bridges photovoltaics rebar reinforced concrete rectifier remote monitoring voltage potential INTRODUCTION Reinforcing steel in concrete is considered the major cause of deterioration on reinforced concrete bridges located in marine environments. Millions of dollars are spent every year...

... was performed on steel reinforced concrete specimens placed in simulated salt water tanks. For the field evaluation, ten prestressed concrete piles of a bridge structure with an existing rectifier powered cathodic protection system were used. In both cases, intermittent cathodic protection was provided...

... days to stabilize and the CP current density had to be increased 1900 percent! ( Table 1 , Lines 10-22) CONCLUSION Laboratory tests using mild steel cathodes in a highly corrosive saline electrolyte indicate that the CP current supplied by common single-phase rectifiers may increase the current...

... by most cathodic protection field personnel. This study was an attempt to verify the existence of positive spiking in DC ripple, and possible results. During the project one hundred cathodic protection (CP)rectifiers were observed and oscilloscope waveforms recorded in Tyler, TX. in Bishop, TX stainless...

...Above ground flat bottomed storage tanks anodes cathodic protection dual reference cells leak detection membranes mixed metal oxide anodes permanent reference electrodes rectifier tank to reference potentials tank membrane INTRODUCTION It is the policy of Koch Industries, Inc. to manage...