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Odd Noises from Standard 275 Gallon Oil Tank

Rob Amaral

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I've been around fuel oil storage tanks all my life (had one as a kid in our house). At the start of an inspection yesterday, I heard moaning noises from a 275 gallon fuel oil tank (standard type, drained off the end, had a vent-alarm and standard gauge that indicated it was almost full).

-The burner for the boiler was not running.

-Nobody was doing anything with the tank or heating system.

All I could think of was perhaps a temperature differential was going on and back-venting was going on that involved the vent-alarm.. (Like blowing on a whistle on the wrong end..)

Any thoughts.. ?

Tank was 1955 vintage.. 12 G steel.. nothing unusual..

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