Corrosion Coupon, Injection & Sampling Quill

Injection/sampling systems are an invaluable component to corrosion control systems implemented in a variety of industries. Sampling aids in the detection and measurement of key reactants or products in a corrosion process, such as corroded metal ions and oxygen. Sampling also allows the measurement of the pH level and the concentration of inhibitors present in the system.

Sampling can be used in any environment to measure general corrosion, and the effects of corrosion control measures can normally be quickly detected. The aim of inhibitor Injection is to form a stable adherent film on the internal surface of a pipeline or vessel, which acts as a barrier to aggressive products in the flow line.

The function of the inhibitor can be to slow down the anodic or cathodic reaction, or to generate a film which increases the electrolytic resistance of the circuit. The liquid inhibitor can be added either as a batch or a continuous injection.


The following information is needed to design an optimum injection system:

System Parameters

  • Pipe/vessel diameter
  • Access fitting type
  • Line pressure
  • Fluid viscosity
  • Fluid density
  • Mass or volumetric flow rate
  • Working temperature

Inhibitor Parameters

  • Viscosity
  • Density
  • Temperature
  • Anticipated injection pressure
  • Mass or volumetric flow rat