Corrosion Control & Pipeline Integrity Services
Detail Products & Service
Cathodic Protection System
Cathodic Protection (CP) system is an extremely cost effective means of reducing or eliminate corrosion. This system can prevent corrosion occurring in new structures and mitigate corrosion indefinitely on a retrofit of existing structures. With our comprehensive range of product and hands on experiences we can identify the most suitable CP system and provide solution for every specific condition.
Wilson Walton Indonesia provides turn key services from Designing, installation up to commissioning. In case of existing systems already exist we do maintaining, monitoring and upgrading the system. As part of monitoring, Close Interval Survey (CIS) and Direct Current Voltage Gradient (DCVG), and Current Requirement Test may required periodically. Our on hand experiences, expertise and latest technology and equipment will be available to serve our customers.
Cathodic Protection System (CP) is applicable to prevent external metal surface from corrosion threat. There are Impressed Current Cathodic Protection (ICCP) System which the current sources come from Transformer Rectifier and Sacrificial Cathodic Protection System where Low Potential Metal will be sacrificed to eliminate corrosion on the structure.
ICCP system will consist of some key equipment such as Transformer Rectifier, Anode Ground Bed, Cable, Junction Box, Test Points, and connection kit. Sacrificial Anodes commonly using Magnesium Anode for onshore buried structure, and using Aluminum Anode for Off Shore structure. System designing usually done by site survey and in engineering stage.
As part of services we do also CP upgrading and refurbishment or retrofit. This scope will help customer to increase current requirement due to additional structure protected, or because of existing system depletion.
After Cathodic Protection System is installed, regular Voltage reading must be done through Test Point connection. However, due to un uniform soil resistivity Close Interval Survey (CIS) is strongly recommended to be applied, to make sure all along the pipeline is cathodically protected. CIS will produce detail voltage report of every 1-1.5 m point along the line, so that any anomalies will be detectable before stimulate bigger problem in corrosion.
For majority aging pipeline CIS operation will be complementary continued by Direct Current Voltage Gradient (DCVG) application, especially in extremely low potential (below -800 mV). DCVG is applied for suspected coating damage along the pipeline low potentials reading. As recommended practices some bell hole may be necessary to make sure DCVG report correctly.