Cathodic Protection for Oil & Gas

ALUMINUM BRACELET ANODES

Aluminum bracelet anode is one of sacrificial anode’s type which can be used in cathodic protection system of submarine/offshore pipelines, riser & dog leg of platform, steel pile of jetty, any circular steel structure, etc. Jennings Anodes offers a range of half shell and segmented bracelet anodes that mostly can be installed in sea water or sea mud environment. The bracelet anode, consisting of multiple individual anode sections, is suitable for direct attachment around the circumference of protected structure by thermit-welding or bolted clamp.

Casted in low-iron, high-purity alloys, our indium-activated
aluminum anode is designed to meet the standard of ISO,
NACE, DNV.

This aluminium anode provides a stable performance in
seawater and electrolytes containing chloride ions as its
operating potential is kept between -1.05 to -1.10 volts.

* The open/closed circuit voltage is with respect to a Ag/AgCl reference electrode.

Our aluminum bracelet anode is widely used in sacrificial
anode cathodic protection (SACP) system. The number of
segments depends on the diameter of the structure it
encloses.

GALVO-STRING

The GALVO-STRING is a hanging anode retrofit solution that is installed without the need for diving. GALVO-STRING anodes are simply shackled together and lowered to a desired installation depth, and can be attached to a structure with either a weld-on or clampon bracket. This system is ideal for structures in water depths of 3 meter (10 feet) to 100 meters (330’). Also ideal for short life extensions of 3 to 5 year duration.

MGP-i

The MGP-i is IEV’s latest generation of self-cleaning and anti-impact single-ring product, which can be installed in a single deployment from above water, to both remove existing marine growth and permanently prevent their regrowth in the wave zone, where marine growth is most prolific and wave loading is most significant.

A HIGHLY COST-EFFECTIVE STRUCTURAL INTEGRITY MANAGEMENT AND LIFE EXTENSION SOLUTION

The MGP-i offers a simple, reliable and low cost solution for platform structural integrity management and life extension compared to alternative solutions, which require structural modifications. The employment of MGP-i reduces the dynamic and hydrodynamic loading on the platform, thereby increasing its structural capacity and Reserved Strength Ratio (RSR). The reduction of cyclic wave loading also improves the fatigue life of joints, hence extends the life of the platform.

Throughout the years, the MGP has undergone several improvements, to cater for various ocean conditions and structural configurations, resulting in increased product durability and cost savings. The most notable breakthrough, however, came through an esteemed client with a unique requirement. The MGP was required to operate under icy-ocean conditions during winter period. Hence, began a journey of extensive research and development, resulting in a new generation of product design with both anti-impact and self-cleaning features. After the success of this pilot project, IEV was awarded a full commercial project at the same site. Subsequently, it became an inspiration for the development and commercialisation of the MGP-i design in which “i” symbolises innovative, impact-resistant and improved technical specifications of the MGP.

MGP-i Vs ALTERNATIVE MARINE GROWTH CONTROL SOLUTIONS

Conventional methods of periodical cleaning of marine fouling by divers or ROVS are costly and risky compared to the employment of MGP-i. In addition, MGP-i offers a permanent marine growth prevention solution, in which a zero-growth profile is maintained by the products. Whilst adverse weather conditions disrupt underwater activities, they actually enhance the performance of the MGP-i.

Alternative anti fouling solutions such as the use of copper-nickel panels and anti-fouling paints are either too costly, environmentally unfriendly, time consuming or infeasible to apply in-situ, which requires a highly complex level of supervision to implement, compared to the MGP-i.

GALVOTEC

Lockheed-Galvotec Vertical Tension Anode Systems

Since 1997, Galvotec has been the exclusive distributor of Lockheed’s marine cathodic protection systems to the oil and gas industry. The Lockheed-Galvotec Vertical Tension Anode (VTA) system is the only proven cathodic protection system installed without the use of divers and their costly support vessels and equipment. This system has been successfully installed in water depths in excess of 120 meters from the surface and with ROV assistance to depths greater than 250 meters. Large savings in installation costs are realized and many systems with 20 year lives have been installed and met their design life requirements.

In the 1970’s Lockheed developed and patented the Vertical Tension Anode system as a cathodic protection retrofit technique for offshore platform jackets that are generating on-site power. The generators power the rectifiers that provide current to this anode system. The system incorporates a custom manufactured armored tension cable containing multiple anodes molded on and anchored on the sea floor via a concrete weight. This vertical anode string is tensioned off to a point above the water line therefore restricting its lateral movement to a small deflection envelope. Topside termination allows the individual anode power cables to be tied into the rectifier(s) to facilitate individual anode monitoring and control.

Lockheed-Galvotec Vertical Tension Anodes

The anodes are made of platinum that is welded to a niobium substrate developed by Lockheed. Each anode is custom manufactured in length and anode area so each anode discharges the same amount of current regardless of its location on the VTA string. This anode has been used to protect numerous ships and submarines of the US Navy as well as protecting the cooling water intakes of nuclear power plants and many offshore platform jackets. This proven technology is the only offshore impressed current retrofit system that has over 40 years of proven offshore platform experience. It is designed to withstand 100 year storms.