A pig is most likely used in which type of sewer?

A pig is most likely used in which type of sewer?

• A. House or building sewer
• B. Storm sewer
• C. Gravity sewer
• D. Force Main

Answer: (D)

A pig (pipeline inspection gauge) is used in a sewer system that is under positive pressure, so it can be pushed through the pipe by the pumping system. In a force main, sewage is pumped and kept under pressure, which lets a pig be advanced to clean the line, push out blockages, or aid during tests and maintenance. Gravity-based systems like house or building sewers and storm sewers rely on slope and flow rather than sustained pressure, so there isn’t a reliable way to propel a pig through those pipes. That’s why the force main is the type of sewer where a pig is most typically used.

A pig (pipeline inspection gauge) is used in a sewer system that is under positive pressure, so it can be pushed through the pipe by the pumping system. In a force main, sewage is pumped and kept under pressure, which lets a pig be advanced to clean the line, push out blockages, or aid during tests and maintenance. Gravity-based systems like house or building sewers and storm sewers rely on slope and flow rather than sustained pressure, so there isn’t a reliable way to propel a pig through those pipes. That’s why the force main is the type of sewer where a pig is most typically used.