Quote:
If using a propane tank, the tank valve IS the "outside" shutoff valve.
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Not necessarily. It depends on the distance between the wall where the penetration occurs and the tank itself. If it is more than 5 feet, a valve is required at the point of penetration.
On commercial installations, a valve at the point of penetration is required, regardless of the distance.
It is good practice, generally speaking, to place a valve at the point of penetration. This allows you to keep the tank a fair distance from the house (or stucture).
This is along the lines of putting flashback arrestors on surface mix torches - not totally required, but not a bad idea either.
Also, NG is permitted up to 10 PSI with a special permit, check with your local NG distributor.