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StoneChlor-S Electrochlorination System

StoneChlor – S series Electro Chlorination Package is designed for industrial application that uses seawater for cooling has the potential for the formation of bio fouling from the various organisms lurching in the oceans. The purpose of on-site generation sodium hypochlorite solution from seawater is to economically and safety produce this powerful biocide and disinfecting agent for industrial plant using.
Seawater based electro chlorinator is generally applied for protecting industrial cooling water, circulating water from bio growth, and being widely applied for the reason of its economic operating cost, as the raw material directly drained from the seawater and only electricity as well.
StoneChlor – S systems are the standard and preferred electro chlorination unit for bio fouling control in power plants, cooling towers, liquefied natural gas (LNG) terminals and desalination facilities, as well as coastal installations using seawater for cooling or other process needs all over the world.

Component of Seawater Electrochlorination

  • Seawater Booster Pump
  • Auto Backwash Strainer
  • StoneChlor – S Electrolyzer Assembly
  • Transformer & Rectifier
  • Local Control Panel
  • Storage Tank
  • Air Blowers
  • Injection Pump
  • Acid Washing Package

Parts Options

Measure Unit

DIN Unit

Pipe Material


US Unit



PPE Electrolyzer


Multi Skids

CTE Electrolyzer

Single Skid


Local Control


Auto Backwash Strainer

Remote Control

Basket Strainer

Typical Seawater Electrochlorination 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 (Or cyclone degassing separator) 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.

Technical Benefit of Seawater Electrochlorination

Electrolyzer OEM

On Site Production

Working with the China major anode and specialty coating manufacturer, we have access to the leading industry electrolyzers with over 30 years’ service.

Producing sodium hypochlorite on site reduces the requirement for use of liquid chlorine solutions. The impracticality of shipping, storing and dosing large volumes of bulk hypochlorite on offshore sites means electro chlorination is the industry preferred method of bio-fouling control.


Self-cleaning & Acid washing

Element chlorine is a dangerous chemical, it is harmful to human body like respiratory tract and retina or even death. On site generation with MCT electro chlorination system could prevent operator directly touches the chlorine or other strong acid and alkali for protection.

By applying self-cleaning or acid washing technology for electrode to achieve long lifespan of the electrolyzers assembly.

Full Output Availability

Process Automation

By only supplying self-cleaning electrolyzer designs the packages do not require any scheduled downtime for cleaning. This provides the opportunity for clients to remove any duty/standby requirements for the electrolyzers and thus reducing footprint and cost effective.

Control of the complete technological process with a central PLC control system. Visualization of the entire process and logging of all key parameters of alarms. Any parts of the process of the system could also be adjusted by PLC.

Seawater Electrochlorination Application

  • Power Generation
  • Petrochemical
  • Desalination Plant
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