Why pipelines may need drainage protection
Where pipelines run across or alongside rail-transit or high-voltage infrastructure, AC stray current may create an AC-corrosion risk. A drainage system must release interference current without disrupting cathodic-protection current.
Place drainage and acquisition in one system discussion
An intelligent coupler can combine a drainage module with monitoring, acquisition and transmission. The monitoring relationship may include AC/DC drainage current, interference voltage before and after drainage, protection potential, impedance and temperature.
The equipment, conditions and project requirements should be checked for each application rather than treated as a universal specification.
Conditions to prepare
Provide the relationship between the pipeline and interference source, the existing cathodic-protection system, drainage bed, installation space, power, communication and data items required for upload. The equipment, accessories and construction boundary can then be reviewed.
Key points
- Drainage and cathodic-protection current need to remain coordinated
- AC/DC current and interference voltage can be monitored
- Communication, power and installation must be confirmed by project