testing natural gas header line
 

with compressed air or nitro what is typical pressure to hold and for and for how long...thanks

Air is what is used to test most gas lines. Nitrogen doesn't come into play until you have very large lines. Code minimum here is 15psig for 15 minutes, but yours may vary. Check with your local authority having jurisdiction.

inside house line...3lbs for 15.min....outside service line 90lbs for 10 min... here in my area of pa..ben sr

wow.... Manitoba is 15-20 lbs for 15 min

Code minimum is 15/15 across Canada, as I'm sure you are aware. It seems that every inspector in BC wants 30psig. We test the service line to the meter at 100psig for 10min., but that's for a working pressure of 60 or 80 psig, depending on area.