Whenever the word "rating" is used regarding Ductile iron pipe (DI pipe), a 100-psi surge allowance and a safety factor of 2.0 are consistently included for all wall classes. This leads to conservative yet versatile designs for the long-term performance of utility pipelines of all kinds in various or changing conditions. Hence the basic universal rating for DI pipe is 350-psi which equates to a minimum of 900-psi of hydrostatic pressure containment within the pipeline.
The water industry in the United States has experienced many challenges throughout the years. The good news is that these challenges have been met head-on by experienced, dedicated professionals who continue to provide their customers with clean, safe drinking water even though the bar of excellence continues to rise. One measure depicting the priority of these challenges is the State of the Water Industry Survey, conducted annually by the American Water Works Association. “AWWA’s State of the Water Industry (SOTWI) Survey is designed to identify water sector challenges and investigate possible underlying causes and drivers. In November 2022, when the survey closed, 4,123 water professionals had shared their opinions by responding to the survey—our highest number of responses yet!”(1)
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