What is the standard nomenclature in plumbing blueprints for hot water lines?

In plumbing blueprints, the standard nomenclature for hot water lines is represented by red lines. This color coding is widely accepted in plumbing and mechanical drawings to facilitate clear communication among contractors, engineers, and plumbers. The use of red for hot water lines allows anyone reviewing the plans to quickly identify and differentiate these pipes from others, such as those representing cold water, which are typically indicated by a different color, such as blue.

This color distinction is vital for proper installation, maintenance, and troubleshooting in plumbing systems, as it helps prevent costly mistakes and ensures that hot water is directed correctly throughout the system. Red lines on blueprints serve a practical purpose, ensuring clarity and efficiency in interpreting the plans.