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Oil tank piping: how to hook up fill & vent & oil line piping on duplex or dual oil storage tanks: this document describes the typical piping arrangements for heating oil storage tanks: how the oil tank fill, vent, and supply piping are arranged when two oil storage tanks (or more) are installed at a building.
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Quick Guide to Fill and Vent Piping for Duplex Heating Oil Storage Tanks
At buildings where two heating oil storage tanks are installed, typically indoors, this Audel Oil Burner Guide sketch shows the proper arrangement of fill piping, vent piping, and oil line piping leaving the tanks.
We have seen an alternative arrangement that provides a fill line only to the first tank, with the second tank filled by a second pipe exiting the top of the first oil tank - not an arrangement we recommend as this forces the first oil tank to be fully pressurized at the oil delivery truck pressure during fill-up of the second tank.
The piping shown in this Audel sketch is better. [Click to enlarge any image]
Thanks to Arlene Puentes for technical editing, March 2010.
[Click to enlarge any image]
Our photograph of duplexed or a "pair" of oil storage tanks in a residential basement shows (left) [click to enlarge the photo) shows the most common oil fill, vent, and copper oil supply piping arrangement when two oil tanks are installed side by side at a building.
At installations that include a fire safety valve at the oil tank (useful for service in this case) we like to see an additional fire safety valve at each oil burner oil supply line since that's a spot where a fire is more likely to occur.
See FIRE SAFETY CONTROLS.
As Carson Dunlop Associates' sketch (left) demonstrates,
Thanks to reader D. B. Harlow for asking about how to make the proper connections to have two storage tanks, in parallel.
Continue reading at OIL FILL & VENT PIPING or select a topic from the More Reading links shown below.
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