Final answer:
Lapped flanges should be accessible for inspection and are typically utilized in low-pressure applications where frequent disassembly may be required for maintenance and inspection.
Step-by-step explanation:
The question pertains to the use and placement of lapped flanges in piping systems. Lapped flanges, which are components used to connect pipes in a system, should be installed in places where they are accessible for inspection. This is crucial for ensuring the safety and integrity of the piping system.
They are generally used in applications where the fluid conveyed in the pipe system is not at high pressure, as lapped flanges are not designed for high-pressure sealing. They provide ease of disassembly for inspection and cleaning purposes without the need for cutting the piping system.