When the main wastewater system begins to escalate, underground facility contractors often temporarily divert fluid from one place to another as the project requires. Contractors and municipalities have found that the use of portable pumps is not only cost effective but also efficient in the construction of bypass systems, from the repair of sewer linings to the replacement of pressure mains or the maintenance of waste water treatment plants. Thompson Pumping's Gentry Baumline will discuss some of the key factors behind the successful implementation of the bypass project in this article. Figure 1. Two 16-inch and six 12-inch compressor-assisted dry suction pumps change the flow of purified water at a wastewater treatment plant in Kansas City. These pumps can deliver more than 60 million gallons of water a day. According to the news released by the American Society of Civil Engineers (ASCE), the 2005 U.S. infrastructure report ranked the country's infrastructure as Grade D. Since 2001, the ratings obtained by roads, water systems and other public projects in the United States have not been satisfactory. The American Society of Civil Engineers estimates that the government and the private sector will need to spend nearly 1.6 billion U.S. dollars over the next five years to improve these facilities. In addition, the U.S. Environmental Protection Agency (EPA) estimates that it needs to spend $ 390 billion to repair and replace existing wastewater systems in the next 20 years to meet current drinking water safety standards. Underground facility contractors often need to rely on a diversion project to temporarily divert fluids from one place to another in providing solutions. RELATED DEFINITIONS The temporary bypass system consists of a series of components that divert or purge fluids from existing pipelines during maintenance, upgrades, tests, and / or emergencies. Bypass systems have an open system - draw liquid from an open-air location and pump to another open-air location, closed system - draw liquid from a closed location and apply pressure to another enclosed location, or a hybrid system - Drains from an open system (such as a sewer manhole) and pumps to a closed system (such as a mains). Seemingly a simple concept, there are a few necessary steps to successfully complete a bypass system. A good at bypass engineering design, assessment and construction of any project must have. For any bypass system, the most critical issue is to evaluate the expected flow rate and calculate the correct size of the outlet. Additional points include determining pumping characteristics such as the location of suction pipes and drains, and the system's head pressure requirements. The impact on the environment is also a consideration and EPA has strict requirements on wastewater treatment and emissions. Depending on the pumping characteristics of the system, bypass engineers may choose to use a compressor-assisted dry suction system to prevent stringing of wastewater and waste water and to prevent them from being discharged to the ground, so that the system does not harm the environment. Figure 2. Nine pumps were installed in a sewage bypass project in Akron, Ohio, which lasted a month and a half. Equipment requirements also need to be identified, including pumps, suction systems, valves, monitoring equipment and pipe plugs. Based on these requirements, experts will develop engineering specifications and pumping requirements to determine the scope of the project. The bypass specialist must check the existing system to determine possible peak and average flow rates. The system may deal with domestic water - the flow rate is predictable; it may be a storm - from no flow to high flow; or mixed water - the flow rate fluctuates irregularly. The size of the pump is matched to the expected flow and the overall bypass system design, so it is also important to determine the initial source of fluid. Municipal water from residential areas typically has higher morning and evening flow rates on weekdays and smoother flows on weekends; commercial areas with restaurants are at higher flow rates after mealtime; flow rates in industrial areas are lower for longer periods; Dumping process water or large-scale cleaning will suddenly increase the flow. Ask what kind of medium is pumped? Media type, temperature, pH, viscosity and specific gravity. What is the environment or location of the system? What is the size and amount of solid particles? How far is the fluid being pumped to the building? Storage tank capacity? By-pass project when to start, how long? Does the pump run continuously for 24 hours a day? If so, does it need a 24-hour pump monitoring device? Engine noise is not a problem? Construction near residential areas, schools or hospitals it? Need automatic control? Is there equipment gathering place? Do I need a backup pump? Inlet Design Kinematic Bypass System can apply suction to an existing system at the point of inhalation. The specialist must determine the source and location of the suction. The type of building to be entered by the inlet pipeline determines the type, size and number of inlet lines and also determines whether the bypass system can be operated with the subsea control. There may be a permanent cock to meet the vacuum and flow requirements, as long as they are of the right size and type. The next step is to determine the total head (TDH) using static suction height, suction line length, static outlet height, and outlet line length. It is also important to estimate the total tank depth, Maximum water level, number and diameter of input lines, water storage tank. Export design points