Bypass pumping is a key element in the successful installation of most pipeline rehabilitation technologies. The existing sewage flow is temporarily re-routed until the project is completed. A variety of pump types and system configurations can accommodate most any flow volume and configuration. With most small diameter pipelines, particularly on short sections of sewer, plugging should be adequate but must be monitored on a regular basis to prevent backup of sewage into adjacent homes.
It is important to design the bypass system to accommodate the specific flow conditions encountered. The pump system suction lift capability must be matched to the depth of the sewer, which must be matched to the size and length of the discharge piping system. Also, emergency or stand-by capacity should be designed into the system in the event of a pump failure during operation of the system. Many cities require 50% additional capacity in the event of a pump failure and in critical areas 100% has been required.
In commercial and industrial applications, it may be necessary to bypass flow from each individual service connection, since flow interruption may not be an option. Individual cleanouts or sewage pick-up points are identified, and a small pump is set-up directing the flow to the mainline pumps.
Bypass Pumping is a critical element in the successful installation of most trenchless pipeline rehabilitation technologies. Typically, bypass pumping will occur due to new construction, lift station rehabilitation, lift station malfunctioning, broken gravity line, force main rupture, tie-ins, pipeline rehabilitation or a combination of factors.
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