Abstract
Hydrostatic testing is an important method for the quality control of storage tanks in industry. After the tanks have been manufactured or repaired, a hydrostatic test is generally carried out with freshwater. Due to lackof freshwater, seawater may be used as an alternative. However, seawater can cause damage to storage tanks. In view of this, the corrosion behavior of welded carbon steel in seawater was investigated in this study. The results showed that the weld metal (WM) is more active and susceptible to corrosion than the base metal (BM). The Linear Polarization Resistance (LPR) and immersion test results showed that the WM has a higher corrosion rate than the BM. In the immersion test, all corrosion rates were less than 3 mpy. Based on the results of the corrosion tests, the hydrostatic test of a storage tank was conducted in a real plant with seawater, and the result was acceptable.
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