A direct and alternating current voltage gradient survey is a method to find out the defects in the coating of the pipeline. Consultech’s DCVG/ACVG survey ensures the identification of the defects and addressing them. The first line of cathodic protection includes a coating of resin and epoxy, due to soil conditions this coating is subjected to defects, these defects promote accelerated corrosion, accelerated corrosion promotes loss, and therefore DCVG/ACVG survey.
Direct Currents Voltage Gradient Survey
A direct current (DC) signal is applied to the pipeline in a DCVG in order to measure the voltage gradient in the soil above the pipeline. Voltage gradients are measured when current is picked up or discharged at sites where pipeline coating holidays occur, as measured between two calibrated reference electrodes placed at a distance from one another.
Alternating Current Voltage Gradient Survey
Similar to a DCVG survey, alternating current voltage gradient (ACVG) surveys produce a voltage gradient at the location of a coating holiday by applying an alternating current signal to the pipeline.
In comparison to alternative techniques, ACVG and DCVG surveys are reported to be more accurate in the detection of coating holidays. Only the DCVG survey is capable of providing a rough estimate of the size of pipeline coating holidays.
Consultech’s AMPP (NACE) certified engineers ensure an expert detailed report of the direct and alternating current voltage gradient survey.
Outside Corrosion
Corrosion may occur on damp surfaces outside as well as within an object. External tank bottoms on ring wall foundations are susceptible to corrosion from ground contact. To safeguard the tank bottom in these applications, impressed current CP systems are the standard engineering design approach. When maintained properly, impressed current systems often have longer design lives than galvanic systems and do not require the replacement of sacrificial galvanic anodes beneath tanks.
There are several configurations for external tank bottom CP systems, just like there are for internal tank CP systems. Using linear anodes in concentric rings is one such method. The major benefit of the linear system is that everything under the tank is factory constructed and tested before installation and the only installation effort is to place the anode assemblies by the design drawings and installation instructions. In addition to guaranteeing the best system dependability, this makes for an incredibly simple installation with low installation costs.
Benefits of using Consultech:
- Experience with various kinds of cathodic protection systems spanning over 58 years
- Cathodic protection system testing, installation, and upkeep experience for all kinds of structures globally.
- NACE corrosion engineers and professionals with high levels of training
- Team members with prior client-side CP project expertise.
- Having experience leading corrosion divisions of big utilities and pipeline industries and multimillion-dollar CP projects.
- Compared to certain regularly used CP systems, Consultech’s several unique cathodic protection technologies are more affordable and have longer lifetimes.
Your corrosion issues are CONSULTECH’s primary concern. In addition to project management and comprehensive turnkey solutions, we are prepared to help with your requirements for corrosion engineering and field service, including design, production, installation, commissioning, and continuing maintenance. Additionally, we provide a huge selection of unique corrosion protection materials.
Contact our team of corrosion specialists for additional information, to ask a question, or to request a price. Within 24 hours, we’ll give you a call or reply to your email. Call +91 9824077820 for assistance and email consultech_cp@yahoo.com right away.
