Linear Polarization Resistance (LPR)

General Info

Linear Polarization Resistance (LPR) is a technique that provides near real-time corrosion measurements. Modern LPR technologies, which often incorporate additional electrochemical techniques (e.g., Harmonic Distortion Analysis or Electrochemical Noise) within a single instrument, can provide accurate monitoring not only in traditionally LPR-applicable systems like cooling water but also in more challenging environments such as sour water, lean amine, and even condensing overhead (OVHD). These modern LPR systems allow for measurement intervals as short as minutes, making it well-suited for online process-corrosion correlation.

Installation

• The retractable system is the most popular solution for installing LPR probes in refining environments. The recommended mounting system consists of a 1-inch access nozzle with a flange connection (see Figure 1). Threaded probe mounting, often using a 1" NPT nozzle, is not always recommended, as vibrations from process pipes or equipment can loosen the threaded connection.

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