Sanitary or Sewer Bypass
NCS Fluid Handling Systems provides a wide variety of essential services to both Industrial applications and municipal.
When municipalities plan on upgrading existing sanitary system lines one thing to remember is you can’t just turn off the flow while working on rehabilitating an existing sewer system but it can be diverted. Over the years this situation has create a huge challenge for these projects. How does the municipality continue to deliver services, or prevent closing roads and disrupting nearby communities and businesses while the contractor is performing rehab or replacement work?
Sanitary systems still need to be used.
When the decision is made to perform sewer rehabilitation it is typically to replace aging or insufficient pipelines. The solutions are that that the waste products must be diverted and a temporary system needs to be put in place. NCS Fluid Systems designers accomplish this by deploying pumps and temporary bypass piping and valves upstream from the sewer pipes that will be replaced and re-enter the sanitary system downstream of where the work is being performed. The size of the system is calculated based on peak flow which varies depending on the number of homes and businesses along this section of a line, the amount of waste material moved can exceed thousands of liters per minute.
NCS Fluid System designers have years of system design and experience and sizing the line is a critical step, since the amount of waste material required to be bypassed varies from time to time throughout the day the temporary system must accommodate this changing flow. Typically, the peak is calculated using flow meters and peak flow is usually early in the morning, and again in the evening when residents return home. This design calculation of peaks is crucial to the project success. If the flow is not calculated correctly and the system is undersized the pumps or piping may not be able to keep up and sewage spill may be the result, which leads to many problems for everyone.
Pump selection may also vary
NCS Fluid System designer and installation crews consider project specific situations such as the depth of the sewer system or distance of bypass, this quite often determines the size and type of pump(s) and ancillary valves, pipe and other equipment needed. For instance, when a sewer line is buried deeper than 7.5 Meters or approximately 25 feet, the designers may select a submersible pump to handle the added head pressure. Where as for systems not as deep a Above ground centrifugal pump with a suction hose lowered into the manhole may be selected.
Flow calculations are only a part of the overall operational considerations that NCS Fluid Systems designer review:
- Are there municipal noise ordinances?
- Road access, NCS offer engineered road crossing to accommodate traffic flow.
- 24-hour system monitoring by skilled technicians
- Equipment placement - Is signage and traffic control required,
- Environmentally sensitive areas may require seamless piping systems such as HDPE piping to be assembled reducing possibility of leaks.
In the market, today a sewer system upgrade project may be an open cut replacement or a trenchless lining technology rehabilitation but the one thing that won’t changes with any rehabilitation is the need for a properly designed bypass system the incorporates the right type, size of pumps and piping. doesn’t change with either of these methods is the need for the proper pumps and equipment.