Define "downstream" in the context of gas supply systems.

The term "downstream" in the context of gas supply systems refers specifically to the portion of the gas supply system that occurs after the control valves and regulators. This is the section where the gas has already been regulated and is ready to be delivered to the appliances that utilize it.

When gas is supplied through a system, it generally begins at the main supply line, where it is under high pressure. The control valves and regulators serve to manage this pressure, ensuring that the gas is at the appropriate levels for safe use. Once the gas has passed through these mechanisms, it is considered to be "downstream."

Understanding this distinction is important for safety and operational efficiency in gas supply systems, as it helps technicians and professionals to identify where certain components are located and how they interact within the overall system.