What is required to be provided in an emergency for gas supply to buildings?

The requirement for an exterior shutoff valve in an emergency gas supply situation is crucial for ensuring safety and quick response in the event of a gas leak or emergency. An exterior shutoff valve allows for immediate access to shut off the gas supply from outside the building without the need to enter. This is particularly important during emergencies when conditions inside might be hazardous or when there's a risk of fire or explosion.

Having an exterior shutoff valve can significantly reduce the response time in situations where gas is leaking, thus preventing further escalation of the emergency. This makes it a fundamental requirement in the design and installation of gas supplies to buildings, ensuring that first responders and building occupants can quickly take necessary safety measures.

While pressure relief valves, automated gas detection systems, and gas leak alarms are important safety features that help monitor and manage gas systems, they serve different functions in the prevention and detection of gas issues rather than directly allowing for the immediate shutdown of gas supply in emergencies.