Tank Stripping

Suction of Oil From Underground Storage Tanks

Vertical progressing cavity pumps also work in the opposite direction 

NEMO® progressing cavity pumps are designed so that they can also operate in the reverse direction and are also used for extracting oil from underground storage tanks.

When a major energy pipeline company looked to streamline their pumping system for their oil storage tanks, they called on NETZSCH to design and build customized vertical cavity sump pumps for lower maintenance and operational efficiencies.

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Suction of Oil From Underground Storage Tanks With NEMO® BT Immersible Pumps

Look behind the scenes

Along the customer’s pipeline are pumping stations needed to power the liquid fuels through the pipeline. At each pump station, there is a underground storage tank used as a collection point for excess oil from service work that is performed on main pipeline pumps. As the collection tanks fill to capacity, the customer needs to pump the liquid from the tank back into the pressurized pipeline.

Challenge accepted

This process had consisted of a two-pump system – with a cantilever pump used to lift the excess oil out of the tank and a high-pressure piston plunger injection pump to move the oil back into the pipeline system.


rpm operational speed

Excellently solved

NETZSCH progressing cavity pumps are tailor-made for this application, with dimensions to fit the customer’s existing underground tank. This pumps are also designed to operate in reverse, requiring the seal to be on the discharge side and the entire housing to be pressurized. The space-saving design of the entire pump disappears into the tank, providing for a very neat and clean installation. This also means that there is no additional effort needed to heat and isolate external equipment – a very important attribute in ambient operating temperatures down to -40 °C. No concerns or issues from field operators. With the success of this installation, the customer has changed their current specification regarding these sump pumps to include or recommend the use of the NETZSCH pump for this application.

NEMO® BT immersible pump

Medium: Oil
Throughput volume: 4.5 m³/h
Rotation speed: 232 rpm
Pressure: 50 bar
Viscosity: 100 cP
Temperature: -5 °C

NEMO® BT Immersible Pumps With Bracket or Flanges by NETZSCH Pumps & Systems