The electric barrel pump

Principle of the barrel pump

A barrel pump is avertical centrifugal pump. At the lower end of adrive shaft(e.g. made of stainless steel or Hastelloy) aimpellerrotates at typical speeds of10,000–12,500 min⁻¹. In everyday use, these pumps are alsocalled stick pumps, submersible tube pumpsorcontainer pumps. genannt.

A barrel pump unit consists of:

• adrive(electric or pneumatic) and
• aapplication-specific submersible tube/pump unit..

Depending on the medium and temperature, differentmaterial variantsare available.Outside of Ex-zonessubmersible tubes can usually be connected without tools to various motors via ahandwheel. werkzeuglos mit verschiedenen Motoren koppelbar.

Materials & temperature ranges (guidelines)

• Polypropylene (PP):up to50 °C
• PVDF:up to90 °C
• Aluminium:up to90 °C
• Stainless steel:up to90 °C(withECTFErotor) or up to120 °C(withStainless steel- rotor)

Construction of the drum pump

1. Motor– Electric (e.g. 230 V/115 V/24 V) orcompressed air(typically up to 6 bar).
2. Handwheel/tension coupling– quick connection motor ↔︎ immersion tube.
3. Adapter– fordrum/container attachment.
4. Hose connection– at thepressure connection.
5. Discharge unit– e.g.fuel nozzleor valve.
6. Discharge hose– in various designs/conductivities.
7. Pump unit/immersion tube– outer tube, inner tube,drive shaft(stainless steel/Hastelloy),rotor/impeller.
8. Pump base– inlet area with distance to the bottom of the drum.

Kinematics & bearing:

The shaft is connected at the top via apump couplingto the motor and is supported at the bottom(chemical-resistantPTFE-or conductivecarbon bearingdepending on material/application). The impeller conveysaxiallybetween the inner and outer tube towards thepressure connectionImportant operating notes:.

rotor must be completely covered

• ; typically about2 cm sein; typ. ca. 2 cmDistance to the bottom of the barrel.
• Barrel pumps generate heat due to the process.Heatand arenot designed for continuous operation. ausgelegt.
• Avoid dry running (risk of bearing/seal damage). vermeiden (Gefahr von Lager-/Dichtungsschäden).
• InEx zonesonly use suitable,conductive components(hoses/connections/earthing); thread connections (e.g.1 ¼″) must be executed accordingly.

Typical immersion tube lengths & selection

• Standard lengths:approx.700, 1000, 1200, 1500, 1800 mm.
• 200-l-barrel:usually1000 mmimmersion tube.
• 1000-l-IBC:usually1200 mmimmersion tube.
• Special lengths:possible depending on the supplier. Forplastic immersion tubes > 2000 mmstability, temperatureandintended usemust be checked separately. gesondert zu prüfen.

Important:The immersion tube isnot a"empty suction tube", but aprecise pumping unitwith internal components.Shorteningorextendingby hose is structurallynot permitted..

Advantages of barrel pumps (overview)

• Modular: Motor and pump station combinable
• Wide range of mediausing suitable materials
• Quick commissioning, easy maintenance
• Clean conveyancewith suitable discharge unit/hoses
• Optionsfor hazardous areas and food applications

Design – required information

In order to select the appropriate drum pump, the following information should be available:

• Description of the application
• Medium(liquid to be conveyed) andconcentration(for chemicals/mixtures)
• Viscosityanddensity/specific weight
• Media temperature
• Solid content/particlesin the medium?
• Required flow rateandtotal lift/pipe length
• Container size/height(e.g. 200 l, IBC)
• Operating duration(h/day, duty cycle)
• Hazardous protection zones, hygiene or regulatory requirements (e.g. food)