Addressing corrosion control and valve tuberculation in a water distribution system supplied by a silica-laden groundwater

作者：Myers O'Farrell Samantha; Duranceau Steven J

来源：Urban Water Journal, 2018, 15(1): 39-45.

DOI：10.1080/1573062X.2017.1364776

• Corrosion control
• operation and maintenance
• asset management

Metal corrosion and valve tuberculation within a water distribution system supplied by groundwater containing 52mg/L silica were studied using a corrosion test rack installed within a residence to determine the effectiveness of phosphate-based (PB) and silica-based (SB) corrosion inhibitor (CI). Results indicated that internal corrosion control based on the use of phosphate-based or silica-based CIs did not significantly decrease iron, lead, or copper corrosion rates, and in one case, caused a negative impact on copper corrosion rate. Evaluations of metal coupons using scanning electron microscopy, electron dispersive X-ray analysis, and X-ray photoelectron spectrophotometry confirmed these findings. Since CI failed to reduce corrosion rates, valve tuberculation within the water system could not be controlled. Consequently, a valve replacement plan was developed in place of an internal corrosion control method using CIs. An opinion of probable replacement cost for 200 tuberculated valves approximated $3.3 million expended over 20years.

• 出版日期2018