Rather than directly from the elevated tank set line?
It would be done oil oxidation, don't do that!
You said the row tubing is the overflow tube or tubes? Oil and gas separator are system hot oil inside, no matter which is not desirable. Overflow is leads to the low trough, hot oil into the tank is low low trough deterioration of oil product.
Oil drain? Confused? Pipeline generally have high notch on the overflow pipe, oil return auxiliary exhaust pipe, oil filling pipe, vent pipe, tube, individual and export the exhaust pipe, tube which is it you??? Ha ha
