What is the purpose of a piping legend?

The purpose of a piping legend is to clarify pipe types and sizes represented on the drawing. In engineering and construction documents, a piping legend serves as a key reference that lists the different types of pipes used in the drawings along with their corresponding sizes, materials, and any relevant specifications. This allows anyone reading the drawings—such as engineers, contractors, or plumbers—to easily identify and understand the various components of the piping system.

Correctly interpreting a piping legend is crucial for ensuring that installation and maintenance are conducted accurately and according to the design parameters. The detailed information provided helps prevent confusion and errors during the construction process, ensuring that the plumbing and piping systems function as intended.