Application Background Printer Friendly Version
Pipeline cathodic protection has been known about and applied to metal structures since last century. The principle of cathodic protection is simple. Corrosion is reduced by two methods
The first method is to connect the metal of the structure to a more easily corroded metal, called a sacrificial anode such that the sacrificial anode corrodes faster than the metal of the structure. Small vessels have these to protect propellers from corrosion and water heaters have these to minimise corrosion in water heater tanks.
The second method is to apply opposing current (this is called an impressed current system) forcing the local anodes to be polarized to the potential of the local cathodes therefore stifling corrosion cells.
Pipelines are generally protected by impressed current systems and there are many expert cathodic protection companies worldwide advising pipeline operators on cathodic protection.
Many oil and gas pipelines traverse very remote regions and there is a need to make sure the cathodic protection systems remain in operation to maintain pipeline integrity.
These systems typically have rectifier stations at various points along the pipeline which take primary alternating current power, perhaps from a local power supply of a local generator, and rectify it to provide a low voltage and high current to apply to an anode buried in the ground.
Through this method the pipeline is protected from corrosion, however there is a need to monitor the performance of these systems as follows
The rectifier station may have a small RTU with a Modbus interface to allow it to be controlled and monitored by a central SCADA system, and this would be common in high population areas where there is plenty of power and communications structure. The rectifier station may also have a simpler system of analog and digital inputs on the rectifier status, perhaps also local power generator status and fuel status and other local parameters.
For the rectifier station a Neon Remote Terminal or Module can monitor Modbus channels and / or individual analog and digital inputs and outputs. There may be a need to make adjustments to the applied voltage/ current and these can be enabled to be remotely managed.
This system would typically be housed in a metal structure, with termination strips and a solar panel and battery and a solar recharge system to the power supply is independent from the rectifier station power supply.
Telemetry would be needed to provide the rectifier station status and possible control from the pipeline operations centre. This could be cell phone based or satellite modem based, more likely satellite modem based as the pipeline is likely to traverse very remote areas.
Perhaps the rectifier station would need to communicate with the central Neon Server every 15 minutes to communicate readings to be displayed on a Central Neon Server and also report out status to a central pipeline SCADA or other management system.
The other measurement points along the pipeline also need to be measured, and this is a very simple occasional measurement of a very low voltage level of the pipeline structure when compared to earth.
For the measurement station points a very small Neon Remote module could be used, with a small lithium battery pack, or a very small solar panel strip supply for convenience, as the power requirements are low
Telemetry would be needed to provide the occasional voltage readings from the measurement points, but quite infrequently, perhaps read the voltage hourly, store it locally, and then and transmit the data to the central neon server daily, to minimise the power consumption and satellite airtime charges.
|Options for Neon Telemetry - NRT / RTU / Field Units||Unidata Part Number||Description|
|Cellular RTU 3G||2013F-AB03||Neon Metering Module 3G with Antenna and Li Battery|
|Cellular RTU 4G||2013F-AB04||Neon Metering Module 4G with Antenna and Li Battery|
|Cellular RTU 3G - Industrial||2016F-AB03||Neon Remote Terminal 3G with Antenna and Li Battery|
|Cellular RTU 4G - Industrial||2016F-AB04||Neon Remote Terminal 4G with Antenna and Li Battery|
|Low Earth Orbit Satellite Globalstar||2015E-AB0||Neon Remote Terminal - Satellite Globalstar Modem with Antenna and three Li Batteries|
|Ethernet||2017E-0B0-1 or 3||NRT Ethernet with single or triple Ethernet Ports|
with three Li Batteries
|Equatorial Orbit Satellite - Inmarsat||2018E-AB0-1 or 3||NRT Ethernet with single or triple Ethernet Ports|
with three Li Batteries
|LCD Display||2500E||NRT LCD Display|
|NRT Field Termination Strip||2103F||2015E,2016F,2017E, and 2018E NRT FTS|
|NRT Firmware Option||2303A-8M||8M Extended Memory Option|
|NRT Firmware Option||2303A-8M-CAM||8M Extended Memory & Serial Camera Option|
|NRT Firmware Option||2303A-CAM||Serial Camera Option|
|Options for Neon Application Software - Customer Server||Unidata Part Number||Description|
|Neon Application Software||2302A||Neon Server Software Licence Incl 5 NAL |
|Neon Application Software||2302A-10||Additional 10 NRT Access Licences|
|Neon Application Software||2302A-20||Additional 20 NRT Access Licences|
|Neon Application Software||2302A-50||Additional 50 NRT Access Licences|
|Options for Neon Application Software - Unidata Server||Unidata Part Number||Description|
|Neon Application Software||2301A||Neon Data Initial Subscription Setup Fee|
|Neon Hosting Service||2301A-01||Neon Data Service Fee for 1-50 NRTs|
|Neon Hosting Service||2301A-02||Neon Data Service Fee for 51-100 NRTs|
|Neon Hosting Service||2301A-10||Neon Data Service Fee Metering|
|Options for Conventional Dataloggers / Field Units||Unidata Part Number||Description|
|Standards Starlogger||6004D-11||Red Logger 512K with Alkaline Battery|
|Display Starlogger||6004D-21||Blue Logger 512K with LCD and Alkaline Battery|
|Prologger||7001D-11||Green Logger 1M with LCD and Alkaline Battery|
|Starlogger Field Termination Strip||6103E||6004D FTS|
|Prologger Field Termination Strip||7100E||7001D FTS|
|Starlog V4 Management Software||6308A-AUE||Starlog V4 Full Licence Key|