Abstract
A new system for continuous monitoring of hydrogen content in line pipe steel has been developed using an electrochemical permeation method (nickel-plating method).This monitoring system consists of two cells made from acrylic resin for nickel-plating and for monitoring, pumping equipment for supply of electrolyte and electronic equipment (Yoshizawa type). The monitoring cell can be easily set at any position on the external surface of line pipe. After nickel plating, the monitoring cell is filled with 1 or 3N NaOH solution and then the electronic equipment is operated potentiostatically at 150mV vs. Hg/HgO. Passivation anodic current decreases gradually down to less than 0.4mA/m2 within one day. After such preparation, the hydrogen content can be monitored. The detection limit of the hydrogen content by this monitoring system is 0.01ppm.A field test for monitoring the hydrogen content in line pipe is performed with high reliability over three months.
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