Which connection can be used with slip-on and threaded flanges, provided the pipe is appropriately drilled?

Flanged connections are specifically designed to connect piping systems in a way that allows for easy assembly and disassembly. When using slip-on and threaded flanges, the pipe must indeed be drilled to accommodate the flange's bolt holes, ensuring a proper fit and secure fastening. Flanged connections create a strong mechanical bond between the components, providing a reliable seal that minimizes the risk of leaks.

In contrast, welding connections are used for permanently joining pieces of pipe or fittings without the need for flanges, while orifice connections are used for measuring flow and typically involve specific fittings that support flow measurements. Joint connections could refer to multiple types of pipe connections but do not pertain directly to flanged formats utilized with slip-on and threaded flanges. Therefore, flanged connections represent the appropriate method for joining systems with these types of flanges, making them the correct choice in this context.