SAMPLING SAVVY

摘要

Corrosion in boilers and steam turbines is among the most expensive causes of outages in utility and industrial power plants. Deposits and scale buildup reduce efficiency and capacity in many units. To control corrosion and impurity ingress, important cycle streams must be continuously or periodically sampled and analyzed. Deposits or chemical reactions in the sampling system and a nonrepresentative sample withdraw can lead to large sampling errors. In water chemistry and corrosion control audits, sampling problems were found in approximately 70 percent of the plants.