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Hydraulics of corrosive gas pockets in force mains
Author(s) -
Walski Thomas M.,
Barnhart Tad S.,
Driscoll John M.,
Yencha Richard M.
Publication year - 1994
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/wer.66.6.2
Subject(s) - buoyancy , hydraulics , mains electricity , corrosion , hydrogen sulfide , sewage , environmental science , waste management , environmental engineering , petroleum engineering , engineering , mechanics , materials science , metallurgy , electrical engineering , voltage , aerospace engineering , sulfur , physics
Hydrogen sulfide corrosion can occur in sewage force mains in places where the sewage does not continuously contact the top of the pipe. This situation can occur because air is drawn into the pipe when the hydraulic grade line is below the pipe, or a gas pocket cannot be dragged down a downward slope because of the buoyancy of the pocket. This paper presents and verifies methods for predicting when each of these situations can occur and applies the results to an existing force main.