Galvanic-Corrosion Failure of a Malleable Iron Latch in a Valve for an Automatic Sprinkler System
One of three valves in a dry automatic sprinkler system tripped accidentally, thus activating the sprinklers. Maintenance records showed that the three valves had been in service less than two years. The valve consisted of a cast copper alloy clapper plate that was held closed by a pivoted malleable iron latch. The latch and top surface of the clapper plate were usually in a sanitary-water environment (stabilized, chlorinated well water with a pH of 7.3) under stagnant conditions. Process make-up water that had been clarified, filtered, softened, and chlorinated and had a pH of 9.8 was occasionally used in...
Galvanic-Corrosion Failure of a Malleable Iron Latch in a Valve for an Automatic Sprinkler System, ASM Failure Analysis Case Histories: Buildings, Bridges, and Infrastructure, ASM International, 2019, https://doi.org/10.31399/asm.fach.bldgs.c0046505
Download citation file:
Understanding the Basics Collection
8-Volume Digital Library Exclusive
The Understanding the Basics Collection provides comprehensive coverage of critical topics in metallurgy. These introductory guides present critical information on key topics related to materials processing, performance, and evaluation.