A sewer mandrel is a specialized tool used primarily for inspecting flexible pipes, particularly in sewer systems. It is commonly utilized in a process known as pigging.
Purpose and Function
The main purpose of a sewer mandrel is to test pipes for deflection or out of roundness. Flexible pipes, especially those installed using trenchless methods, can sometimes deform under the weight of soil or traffic. A mandrel inspection helps identify these issues, ensuring the pipe maintains its intended shape and flow capacity.
The mandrel is pushed or pulled through each pipe segment. As it travels, it checks the internal diameter and shape of the pipe. If the pipe is significantly deflected or deformed, the mandrel will encounter resistance or stop.
How it Works
According to the provided reference, a mandrel is a tool made with metal rods and fingers that will stop itself when it encounters an issue or blockage. This simple mechanical design allows it to act as a go/no-go gauge for the pipe's internal dimensions. If the pipe is within acceptable limits, the mandrel passes through smoothly. If it encounters a point where the pipe has deflected inward beyond a certain threshold, the mandrel's fingers or rods will catch, indicating a problem location that requires further investigation or repair.
Key features of a sewer mandrel:
- Used for testing pipe deflection and out of roundness.
- Pushed or pulled through the pipe.
- Consists of metal rods and fingers.
- Designed to stop when encountering an issue or blockage.
- Part of the pigging process in pipe inspection.
Identifying these deflections early is crucial for preventing future issues like blockages, structural failure, or reduced flow efficiency in the sewer system.
