Sound Attenuation Pumping
Sewer Bypass and Sound Attenuation
It appears that our recent post on sound attenuation and Echo Barrier caused some confusion to some in the pumping market and sewer bypass market.
To clear up this confusion the sound attenuation package we selected on that project in the lower mainland was the Echo Barrier product and was sourced as a result of the sound attenuated pump rented not being able to achieve the mandated decibel requirements. Echo Barrier was the best option and overachieved the requirements. However, to clear matters up this particular project was a WellPoint dewatering project in an urban setting in the lower mainland and not a sewer bypass.
While the Echo Barrier product is always available to NCS and the market as an option for low sound, privacy fencing and light control NCS Fluid Handling Systems has also been very successful in urban settings achieving the mandated lower decibel requirements using Selwood super silent pumps. As on our last four projects in Vancouver, (two in) Victoria and Richmond, British Columbia NCS Fluid Handling Systems has successfully incorporated these industries specified Super Silent S150 pumps into our engineered bypass plans and operated successfully exceeding the decibel requirements and without any noise complaints. With new pumps arriving this month into the Port of Vancouver NCS has been able to advance book these new units on several upcoming projects in 2019 in British Columbia as well as new sites in south Saskatchewan, Winnipeg, Manitoba and one in Fort McMurray, Alberta.
With the in-house ability to professionally engineer and design sewer bypass plans NCS Fluid Handling Systems can immediately serve municipalities on planned upgrades or emergency response to existing sanitary system lines.
City services must remain open and operational, so the flow can't simply be turned off. If the project is to rehabilitate an existing sewer line the flow needs to be diverted and the residents in the area need to have continued services. This means efforts also are made to minimize overall impact such as; not closing off roads, minimize disruption to nearby communities and businesses, reduce the overall sound levels and negative impact of operational equipment in these residential areas and community safety while the contractor is performing rehab or replacement work.
When the decision is made to perform sewer rehabilitation, it is typically to replace aging or insufficient pipelines. The solutions require that the waste products be diverted, and a temporary system is put in place. NCS Fluid Handling Systems designers accomplish this by deploying sound attenuated pumps to temporarily bypass piping and valves upstream from the sewer pipes that will be replaced and then to re-enter the sanitation 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 the section of a line. The amount of waste material moved can exceed thousands of liters per minute!
NCS Fluid Handling Systems engineers and designers have years of systems design and experience, which is needed when properly sizing the lines and pumps. 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.
NCS Fluid Handling System engineers, project managers and installation crews consider project specific situations such as the residential impact, depth of the sewer system or distance of bypass, as 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 metres or approximately 25 feet, the designers may select a submersible pump to handle the added head pressure. In contrast, for systems not as deep, an 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 designers review. Other considerations include:
Are there municipal noise ordinances?
Road access - NCS Fluid Handling Systems offers engineered road crossing to accommodate traffic flow and 24-hour system monitoring by specially trained technicians in system setup and operation.
In today's market, a sewer system upgrade project may be an open cut replacement or a trenchless lining technology rehabilitation, but the one thing that won’t change with any rehabilitation is the need for a properly designed bypass system that incorporates the proper pumps, piping, and support equipment.
Learn more about how NCS Fluid Handling Systems' complete sewage bypass services and equipment can be perfectly adapted to your project or contact us for a sewer bypass service quote.