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Posted by HeatPro on September 25, 2011 at 23:02:43:
In Reply to: Tank replaced inside my basement posted by Mitch on September 25, 2011 at 22:27:32:
Strange comments, as underground tanks pull from the top tube whether single or double tube. His comments indicate that he doesn't have experience.
An inside tank is less likely to have condensation and sludge build-up than an outside or in-ground tank, so the extra inches are no more necessary than that of the old installation. An accumulation of sludge over the 'extra tubing' collected over time means that the tube can't be pulled or pushed over the sludge level while there is oil in the tank. The settlement height is mostly there to avoid water collection getting to the burner, as oil floats on top of settled water. As it is set up, there's no easy way to drain collected bottom water.
To write it more clearly, the bottom valve would be better used to drain bottom water, and the single tube would be better to come off the top to allow the tube end to dip near the bottom of the tank.