Corrosion coupon monitoring!
Corrosion coupon monitoring
As one of the most basic methods of corrosion monitoring, corrosion coupon monitoring has the characteristics of simple operation and high data reliability, and can be used as an important basis for equipment and pipeline material selection. At present, there are two main methods of corrosion coupon technology used in Shengli Refinery. One is to use the device to shut down for maintenance, hang corrosion coupons in key corrosion parts inside the device, wait for a production cycle, and then take them out when the device is shut down for maintenance again, measure the corrosion weight loss of the coupons, and calculate the corrosion rate. This method is called On-site corrosion coupon monitoring. The monitoring period of this method is based on the operation period of the device, which is usually 2 to 3 years. The second method is to use coupon probe technology (Figures 1 and 2)
During the operation of the device, key corrosion areas are monitored, and the monitoring period is usually one to two months. The corrosion coupon monitoring operation cycle is relatively long, and the measured data is the average corrosion rate of the device over a period of time, which cannot reflect the corrosion rate of the equipment at a certain point, so it cannot be used for real-time online analysis. The corrosion coupon monitoring data is mainly used for equipment material selection and monitoring the application effect of process anti-corrosion measures. It can also be used as the basis for comparison of other corrosion monitoring data.
