Use CasesInjection proportional to flow rate in a ballast water management system

Liquid Type
Process Type


Water treatment device manufacturer

Customer's Needs and Problems

We want to inject chemicals into seawater in the ship’s built-in ballast water management system.
Disinfectant (sodium hypochlorite) is injected proportional to flow rate and neutralizing reducing agent (sodium sulfite) is injected proportional to concentration.

  • A high level of reliability is required in order to strictly adhere to the discharge standards prescribed by treaties.
  • The treated volume fluctuates greatly, so we would like to have a large control range for the chemical injection amount.
  • After treatment, the water is discharged directly into the sea, so the water must be treated completely.
  • The space on the ship is limited, so we want the device to be compact.
  • To reduce the maintenance load, we want to make the piping sturdy and simple.

TACMINA's Solutions

We suggested that the customer use a Smoothflow Pump, and they agreed to this proposal.

  • Because of the continuous, constant flow with no pulsation, the amount to inject can be measured and controlled with a flow meter.
  • It is now possible to support a wide range of control at 1:60.
  • Mixing and treatment are performed inside a pipe without having to install a stirring tank, which makes the device compact.
  • Because there is no pulsation, the piping diameter can be reduced.
  • Because there are no piping vibrations, the system is sturdy. Also, accessories such as an air chamber are unnecessary, which has reduced the maintenance load.

Flow Diagram