Dean Romig please check in

[Southpaw]

It is hard to say individually where a leak happens in a residence that is why the pressures are supposed to be so low. It takes a lot of gas in a confined area to build up cause an explosion. Most of the time even if there is major break in a line the pressure is so low at 2 psi that the gas dissipates before it becomes bad enough to blow up or cause a fire and you smell it easily.

Natural gas can also have a lot of moisture in it but it takes a long long time to rust out the pipe. Most of the time where I have seen issues is around the joints and fittings that is generally first failure point. Sometimes the pipe compound they put there will get old, brittle and crack and a sustained pressure spike would fail at those points badly.

Thank goodness hopefully no one was killed or injured. I got a feeling before service is restored your going to get a lot of info. One thing I would do is go and shut off all the valves you have in the house past the main shut off at the meter and to the furnaces. When they say you can turn on it on again test every joint you can in between with spray bottle that has some water and liquid soap in it like your making bubbles with your kids and grand kids and look for bubbles emerging. As you get past each section then and its okay then open valves and test next parts past that. It could be leaking and you not even smell it, but this test will show the leaks. Though have a feeling they are going to make that gas pretty stinky as a precaution for people and detectors to pick up the smell if there are leaks.

Another bad spot are the flexible lines that have all those ridges and those are used at connections generally to furnaces and appliances. They can look totally fine but moisture can collect there and rust those out in the interior of flexible pipe so definitely spray those down with soapy water. I do once a year. They say your supposed to replace those lines about every 7 to 10 years, but no one does until they have a problem.

You'll probably be fine but at least the soapy water test will give you peace of mind.