DR-2 CD™
Polarization monitor (reference electrode and current density sensor)

The DR-2 utilizes both zinc and silver / silver chloride reference electrodes for accuracy and longevity.

The Polatrak DR-2 CD combines the standard DR-2 dual element reference electrode with a 1 sq. meter current density monitor, thus providing a compact package which will give accurate polarization data from a single instrument. The instrument may be either hard wired to a surface location or read subsea with a SunStation readout.

The sintered Ag/AgCl reference electrode provides very accurate potential data to monitor polarization of the structure. The heavy-duty zinc electrode element provides a reliable, long-term data source alongside the more accurate, but volatile silver chloride. Polatrak systems give you the option to tie into communication lines, providing remote cathodic protection monitoring over the existing infrastructure. Deepwater machines all of our polymer components in-house, allowing us to provide extensive QA QC for all of our products.

Use of permanent monitoring systems has grown recently, based on increased integrity emphasis and the ease of data telemetry. The DR-2 CD represents the latest innovation in cathodic protection monitoring from the world's leading supplier of these systems.

Applications

New offshore structures

For new offshore platform jackets and drill rigs, as well SPAR, TLP, and FSU / FPSO structures etc., the DR-2CD as part of a cathodic protection monitoring system allows operators the reliability of a 20 year system life. Reference electrodes can be welded at any of the main critical areas and hard-wired to the surface, integrating with existing electrical systems.

Existing offshore structures

For existing structures, the DR-2CD must be attached by RetroClamp to critical areas where either a tubular member, riser, or flange is present. The RetroClamp can be installed by diver or ROV, and the rugged conductor cable from the DR-2CD can be routed up tot he surface with standard cable clamps. The splash zone will require an I-tube for protection, unless the cable can be routed up through an existing J-tube.

New and existing subsea equipment

For subsea equipment without a nearby topside area to route cable to, the DR-2CD must be connected to a SunStation readout monitor. The SunStation is powered by the lights from an ROV, and can be pre-installed topside or retrofitted via ROV.

DR-2 CD as impressed current CP controller

When combined with an impressed current cathodic protection (ICCP) system, the DR-2 CD can act as monitoring system and a controller for the levels of the transformer rectifiers powering the ICCP system.

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Key design points

Reduce the need for subsea inspection

Structures with permanent cathodic protection monitoring systems can be inspected subsea much less frequently, as they will have the ability to perform interval surveys with a simple voltmeter.

Pre-installed

The rugged design allows the DR-2 CD to be welded reliably to any new structure and wired to the surface at a minimal cost, prior to the structures deployment.

Reliable, rugged conductor cable

The double steel wire armored cable can be free routed on offshore structures with simple bands or cable clamps, thus saving cost of conduit or duct systems. Signal conductor for each of the reference electrodes, as well as the current density monitor are all contained in a single cable.

Dual Elements (Zn and Ag/AgCl)

The dual elements combine the high accuracy +/- 0.005 V of the Silver / Silver Chloride electrode with proven longevity of the Zinc electrode, making the instrument the most valuable reference cell available.

Current density monitor

The DR-2 CD combines the standard DR-2 with an integrated current density monitor (a large metal fin). The reference electrodes together with the current density monitor allow the operator to calculate data about the polarization of the structure - very important for asset integrity managers.