Accurate, frequent wall thickness measurements enable determination of corrosion / erosion trends with unparalleled accuracy and confidence, at the desk of all involved in making decisions about facility integrity and management – at facility and / or corporate locations.
much higher quality wall thickness measurements, by eliminating the multiple sources of error associated with manual inspection – variability from one measurement to the next in time of measurement location, of equipment used, of operator expertise
frequent wall thickness measurements – the measurement frequency of any individual sensor can be reprogrammed at any time from the desk
With a measurement frequency at the default of twice per day the corrosion / erosion rate can be determined quickly, within several days, and accurately, within 0.1 mm/yr (4 mpy). With a higher measurement frequency the rate can be determined within tighter bounds or over a shorter period of time - to a degree unparalleled with any other corrosion or erosion monitoring solution.
This example of measurements at one location over a number of months confirms that there is no metal loss – no corrosion or erosion. Examples where this is of value include
If at a remote location, such as a crude overhead line, an indication that expensive access does not have to be arranged for manual inspection before the next turnaround
If at a location where the risk of corrosion was uncertain, an indication that, for example, there is scope to increase feed TAN levels
This example of measurements from a single sensor location over a number of months confirms metal loss is at a consistent rate, and enables forecasting of wall thickness - for example, can / can't we operate until planned turnaround? - if process conditions, inhibition strategy and feedback are kept unchanged.
This example shows no metal loss from August to December, followed by the onset of corrosion, illustrating the value of knowing when that happened - the change can be correlated with changes in potential corrosion drivers, such as process conditions, inhibition strategy and feedstock.
A continuous picture of the rate gives valuable feedback on the impact of operating decision on the plant - here, of the impact of changes in crude blend and corrections to inhibitor use in response.