Bypass Pumping is the process of pumping storm water or sanitary wastewater from point A to point B. In most cases, this is from one manhole to another; the purpose of it is to pump flow away from the area that we are working. Bypassing is required when we are performing a CIPP install to keep the line nearly dry as we invert, cure, and cut ends.
A pump is setup next to or within the upstream manhole, bypass hose or HDPE pipe is laid on the ground level to the extent required, and then the flow is discharged downstream.
An emergency bypass would be required when a line collapses. Pumps and bypass hoses are setup onsite to divert flow from the affected line to reduce the chances of surcharging a manhole or backing up wastewater into houses that tie into the damaged pipeline.
During the curing process the liner blocks flow from continuing downstream in that section of pipe. A bypass is setup in this case to handle live flow during the time that the pipe is out of service.
Industrial facilities may need to divert flow to perform necessary repairs. A bypass is setup to safely divert flow in this situation.