What type of connectors shall be used to connect the vacuum pumps with their intake and outlet piping?

The correct answer is flexible connectors, which are essential for connecting vacuum pumps with their intake and outlet piping. Flexible connectors are designed to accommodate movement, vibration, and thermal expansion in the piping system, which is particularly important for vacuum systems that often operate under changing pressures and conditions.

Using flexible connectors helps to avoid stress on the piping and the vacuum pump, reducing the risk of leaks or mechanical failure. They also allow for easier installation and maintenance, as the flexibility can help in aligning the piping systems without rigid connections that might require precise alignment.

Other types of connectors, such as anti-vibration, dielectric, or insulated, serve specific roles in different contexts but do not provide the same level of adaptability and resilience required for the dynamic conditions present in vacuum systems.