In a common gas system serving multiple buildings, where should shutoff valves be installed?

Shutoff valves are critical components in a gas system, particularly when serving multiple buildings. Installing shutoff valves at each building is vital for several reasons. First, it enhances safety; if a gas leak or emergency occurs in one building, the shutoff valve allows for a quick response by isolating that building from the gas supply without affecting the other buildings.

Moreover, having shutoff valves at each building supports maintenance and repairs. Technicians can perform work on the gas system within a specific building without needing to shut off the gas supply to the entire system, minimizing disruptions for other occupants.

This practice aligns with safety standards and best practices in gas system design, ensuring that each building can be managed independently and safely. While valves in the main supply line or at the gas meter serve important functions, they do not provide the specific localized control and isolation that installing valves at each building offers.