Corrosion Below: Sewer Structures

摘要: When a sewer system fails, the cause is often not pipe but manhole, junction or other special-purpose structure. Most of these structures are concrete, either cast in place precast. There two major causes internal corrosion sanitary sewer. One conventional acid attack caused by low pH industrial waste discharged directly into system; goes several terms: sulfide corrosion, hydrogen attack. In general, any structure configuration that results significant hydraulic energy loss will accelerate and may also induce serious downstream pipe. Many factors increase amount produced sewage H 2 S escaping from wastewater. Coatings, liners proper design all help to protect structures. Modifying concrete mix usually involves increasing alkalinity, since rate inversely related alkalinity. Coating performance sensitive application weather conditions.