Water Pipelines Fatigue Causes Main Break A Cambridge, Mass., water-main break on June 4 was caused by thermal cycling of underground piping and fatigue in the decade-old water main, says Sam Corda, managing director of the city's Water Dept. The water main cracked at the bell, and an 18-in. triangular piece broke off; however, water pressure was restored within 24 hours, says the Cambridge Dept. of Public Works. Thermal cycling of underground piping caused by changes in water temperature can increase stresses in the metal and casting, Corda says.Dams San Francisco Public Utility OKs Big Dam Replacement Project The San
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