Immediately after turning on the gas in a new system, what must be done to ensure no gas is escaping?

After turning on the gas in a new system, it is crucial to perform a check to ensure that no gas is escaping. This involves actively monitoring the connections and components of the gas system for any signs of leakage. A gas leak can pose a serious safety risk, including the potential for fire or explosion.

This checking process typically includes methods such as applying soapy water to the joints and fittings. Bubbles will form if there is a leak, indicating where gas is escaping. Therefore, performing this check is a critical step in confirming the integrity and safety of the gas system after it has been activated.

The other options, such as inspecting, locking, or recording, do not specifically address the immediate need to verify the absence of gas leaks right after activating the system. While inspecting might also be part of a comprehensive safety check, it does not convey the active and immediate nature of verifying for leaks. Locking refers to securing the system, and recording may involve documentation but does not relate directly to ensuring safety from gas leaks. Therefore, checking is the most appropriate and immediate action required.