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Controlled Deposition of Protective Calcite Coatings in Water Mains
Author(s) -
McCauley Roberf F.
Publication year - 1960
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1960.tb00621.x
Subject(s) - calcite , deposition (geology) , coating , mains electricity , materials science , mineralogy , geology , composite material , engineering , electrical engineering , sediment , geomorphology , voltage
In two articles published recently, the author described a process that he developed for the controlled deposition of protective calcite deposits in water distribution lines. In these articles, the results of a series of experiments with this coating process were related to the hydraulic and chemical principles that govern the deposition rate and crystalline structure of the calcite coatings. Until recently, experimental work on this process has been with 3/4‐in. black‐iron nipples and with thin, flat, 1 X 3‐in. cast‐iron plates. Theoretical computations indicated that the procedures and techniques developed from small‐scale laboratory studies were equally applicable to water distribution mains. To determine the validity of this hypothesis, full‐scale field tests were undertaken with a 6‐in. cast‐iron water line extending from one of the campus wells at Michigan State University to a reservoir approximately 1,200 ft away. To date, six field trials have been made with the 6‐in. line under carefully controlled conditions. All trials have been remarkably successful in coating a 2‐ft section of 6‐in. pipe which was set on the end of the 1,200‐ft line as it discharged into the reservoir.