10172 Pipeline Process Corrosivity Measurement Using Mechanical Diaphragm Sensors

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Product Number: 51300-10172-SG

ISBN: 10172 2010 CP

Author: Nathan K. Brown and Fritz J. Friedersdorf

Publication Date: 2010

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Traditional corrosion monitoring techniques tend toward those which are suited for cumulative loss measurement (e.g. Electrical Resistance) or rapid corrosion rate measurement (e.g. Linear Polarization Resistance), but generally not both in the same package. Furthermore, electrochemical techniques can be confounded by variations in process conductivity and muhiphase flows. A newly developed process corrosivity sensor bridges the gap between traditional ER and LPR sensors by monitoring cumulative mass loss with sufficiently high resolution to penni! rapid corrosion rate assessment. The primary sensing element is mechanical in nature, not relying on process conductivity, and is suited to a wide range of processes, such as potable water, oil and gas, chemical, and electric power applications.

The corrosion sensing system operates on a diaphragm-based principle, where the diaphragm is a surrogate element that corrodes similarly to the pipeline. Small changes in diaphragm thickness can be detected by monitoring the diaphragm response to the applied pressure intrinsic to the pipeline process. This paper presents laboratory data obtained under representative environmental conditions of the Army field site at which the sensor will be demonstrated.

Keywords: corrosion sensing, optical sensors, pipeline corrosion, accumulated corrosion, corrosion rate