Electro-Chlorination Package in FPSO

 Electro-Chlorination Package in FPSO

Electro chlorination is the process of producing hypochlorite by passing electric current through salt water.

Electro chlorination is a process that involves using electricity to generate chlorine from saltwater. This chlorine can then be used for various applications, such as disinfection, water treatment, or corrosion control. In the context of a Floating Production, Storage, and Offloading (FPSO) vessel, electrochlorination can be used for seawater treatment and disinfection.

On an FPSO, seawater is often used for various purposes, such as cooling systems, firewater systems, ballast water treatment, and general utility water. Electrochlorination systems can be installed on FPSOs to treat seawater and produce chlorine on-site. The generated chlorine can be used to disinfect seawater to control marine growth and prevent biofouling in the vessel's systems.

The advantages of using electrochlorination on an FPSO include:

  1. On-site chlorine generation: Electrochlorination allows for the on-site production of chlorine from seawater, eliminating the need to transport and store chlorine gas or liquid bleach on the vessel.
  2. Continuous disinfection: Electrochlorination systems can provide a continuous supply of chlorine for disinfection purposes, ensuring that the water quality remains within acceptable limits.
  3. Environmentally friendly: Electrochlorination is a more environmentally friendly option compared to traditional chemical disinfection methods, as it does not involve the use of hazardous chemicals.
  4. Cost-effective: By generating chlorine on-site, FPSO operators can reduce costs associated with purchasing and transporting chlorine chemicals.

Overall, electrochlorination systems can be a practical and efficient solution for seawater treatment and disinfection on FPSOs, helping to maintain the integrity and efficiency of the vessel's systems.


Component of Seawater Electrochlorination

  • Seawater Booster Pump
  • Auto Backwash Strainer
  • OceanChlor-EX Electrolyzer Assembly
  • Transformer & Rectifier
  • Local Control Panel
  • Storage Tank
  • Air Blowers
  • Injection Pump

Process description

Bio fouling control is one of the main challenges in the upstream processes of the power station is to protect pipeline and process equipment against biological fouling. Restriction of cooling water flows, acceleration of corrosion and a reduction in the overall life of process equipment can all be controlled by the effective design of our electro chlorination package. Seawater Electro chlorination system packages play an effective role in optimizing flow assurance. Raw seawater is fed into the package inlet at the designed flow rate via a side stream from the main seawater process line.


Once controlled, the seawater is passed through the electrolyzer which are fed an electrical supply from the package rectifier. Depending on pressure available this seawater flow will be pressure controlled or boosted to provide the optimum operating pressure and flow rate (required for the chosen electrolyszer configuration). The rectifier is designed specifically for the requirements of the installed electrolyzers. It converts the AC platform input voltage into the required low voltage DC current and regulates this output to a selected and controlled level.

Electrolysis process takes place within the electrolyzer as per the following equation:

  • At the anode: 2 Cl - 2 e → Cl2
  • At the cathode: 2 Na+ 2 H2O + 2 e→ 2 NaOH + H2
  • Overall: 2 NaCl + 2 H2O → 2 NaOCl + 2 H2

Through the electrolysis process the package produces the required amount of sodium hypochlorite together with the by-product, hydrogen gas. The solution with hydrogen gas are fed into degassing tank and the hydrogen to vent to open atmosphere. The hydrogen free solution containing sodium hypochlorite is then dosed into the seawater circuit through dosing pumps or gravity.



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