Why is it important to know the difference between pressure and non-pressure systems?

Understanding the difference between pressure and non-pressure systems is crucial for applying the appropriate building codes and standards during installation and repair. Pressure systems, such as potable water supply lines, operate under specific pressure levels and require certain materials, fittings, and installation techniques to ensure they can safely handle this pressure without leaking or failing. In contrast, non-pressure systems, like drainage or waste water systems, work under different principles and design considerations since they primarily rely on gravity rather than internal pressure to function.

By adhering to the correct codes and standards that correspond to each system type, plumbers ensure safety, compliance with local regulations, and longevity of the plumbing system. Proper knowledge of these systems helps prevent potential failures, which can lead to expensive repairs, health hazards from leaks or contamination, and issues with building inspections or codes compliance.