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Airtrol and Expansion Tank Maintenance

What should I be doing maintenance wise with an old steel expansion tank with a B&G Airtrol fitting on the bottom of it and a boiler drain also on the bottom of it. I have not tried opening the drain yet, but the tank sounds empty when tapping on it.
I am going to be draining the system down to do work on the wet side. Should I have the shut off valve to the expansion tank in open or closed position when refilling and then open it when the system is pressurised? Do I need to be concerned with making any adjustments to the airtrol fitting?
Any input on proper procedure will be greatly appreciated.
I am going to be draining the system down to do work on the wet side. Should I have the shut off valve to the expansion tank in open or closed position when refilling and then open it when the system is pressurised? Do I need to be concerned with making any adjustments to the airtrol fitting?
Any input on proper procedure will be greatly appreciated.
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Comments
the system for repairs, may as well drain the tank too. So leave all the valves open.
In my 30+ years I have NEVER been able to tell how full a tank-is by tapping on it.
Drain-it, and you`ll know,,, those B&G Airtrol fittings are great though. no adjustment necessary, except for the initial fill.
BTW- If you`re going to do that I would also run some Rhomar system cleaner through everything too,, can`t hurt. :-)
I can tap out a standard expansion tank to make sure the bladder is not busted or out of air but those old ones are much harder to tap out.