Abstract
This paper will summarize a study completed by the National Research Council (NRC) of the National Academies Review of the Bureau of Reclamation’s Corrosion Prevention Standards for Ductile Iron Pipe. The NRC committee evaluated submitted data and case histories to determine if different corrosion control methods could meet the desired life of the Bureau of Reclamation’s criteria for a 50 year life. The response to the committee to two specific questions will be discussed. The two questions were “Question 1 Does polyethylene encasement with cathodic protection work on ductile iron pipe installed in highly corrosive soils? Question 2 – Will polyethylene encasement and cathodic protection reliability provide a minimum service life of 50 years?” This presentation will discuss the various corrosion control methods evaluated including a review of the corrosion performance of ductile iron pipe based on case histories and data and the resulting corrosion rates determined by the committee for the various corrosion protection methods. The results of the committee findings in response to the two questions will be summarized. The presentation will summarize other corrosion control considerations that were discussed (corrosion allowances, soil enhancements including controlled low-strength material (CLSM), anti-MIC polyethylene encasement, micro-perforated polyethylene encasement, and various pipeline monitoring and repair considerations).
