LIDA TSA™ Anodes
Impressed Current Cathodic Protection for Offshore Platforms
Replacing depleted aluminum anodes on offshore structures is an extremely costly and potentially dangerous practice, particularly in water depths exceeding 200 feet. In an attempt to eliminate the high cost and safety hazards of deep water diving, required for aluminum anode replacement, many companies have experimented with impressed current systems. The mechanical design and durability of many early impressed current systems were clearly not suitable for the demanding offshore environment.
LIDA® now introduces the new patented Tensioned String Anode™ (TSA™) system that virtually eliminates the potential for mechanical failures that have plagued earlier impressed current systems. LIDA's TSA™ features a rubber coated heavy walled riser that serves as an armor for electrical conductors that pass through the splash zone. A tension cable with a working load rating of 36,000 pound provides the mechanical support for LIDAŽ Anode Assemblies from approximately the minus 50 foot level to the sea floor.
LIDA's® design makes installation safe and cost effective by limiting diving to the minus 50 foot level or less. The tension string is fixed to a member near the minus t0 foot level and then tethered to a segmented weight system on the sea bottom. A unique modular design facilitates the addition of multiple 5,000 pound plates, easily maneuvered with standard air tuggers.
The Tensioned String Anode is the reliable, safe and easy to install alternative to costly sacrificial anode retrofits.
LIDA TSA™ Anode Drawing
- Multiple LIDA® anodes and armored cable are assembled on a supporting rope.
- Spacers insure the anode is in complete contact with seawater.
- The LIDA TSA™ is connected from the platform to a dead weight on the sea floor.
- Fewer anodes required with higher current density.
- Current output is easily adjusted.
- Ease of installation reduces cost of cathodic protection system.
- Greater savings in deep water installations.
- A twenty year history of successful cathodic protection on platforms from 15 to 120 meters in depth.
|Steel Wire Rope|
|Diameter||22 mm (0.875 in)|
|Construction||3 X 19 Seale|
|Weight in Air||0.55 kg/ft (1.21 lbs/ft)|
|Elastic Limit||26,590 kg (58,500 lbs)|
|Minimum Breaking Load||35,455 kg (78,000 lbs)|
|0.2% Yield Strength||32,180 kg (68,600 lbs)|
|Anode - LIDA® 2.5/100 Tubular Anode|
|Current Output in Seawater||50 amps|
|Diameter||25 mm (0.984 in)|
|Wall Thickness||1.02 mm (0.040 in)|
|Length||100 mm (3.28 ft)|
|Weight||0.36 kg (0.80 lbs)|
|Composition||Mixed precious metal oxide|
|Composition||Titanium, Grade 1 per ASTM B265|
|Exane Rig Cable||4/0AWG|
|Insulation||Irradiated Cross-Linked Polyolefin|
|Maximum Current Output||560 Amps|
|Variclump||Modular 5,000 lb. plates|
|Maximum Depth||Minus 50 foot Level|