Industrial Pump Types and Their Applications

Two Families Define Every Industrial Pump Type

Every industrial pump type belongs to one of two families. A centrifugal pump adds velocity with a rotating impeller and lets the casing convert that velocity into pressure; at a fixed speed it delivers whatever flow the system allows, suiting clean, thin liquids that need continuous flow. A positive displacement pump displaces nearly the same volume each revolution regardless of discharge pressure, so flow follows speed while pressure rises to match the system — hence the relief valve and the PD dominance on viscous media. The crossover sits at roughly 150 cSt, above which a gear, screw or lobe pump is the better tool.

Centrifugal Pump Types: End-Suction, Inline, Multistage and Self-Priming

The centrifugal family covers most water, cooling, transfer and boosting duties in a plant. End-suction and inline pumps handle general water and process service, multistage designs stack impellers for boiler-feed heads, self-priming variants lift liquid from below the pump, and solids-handling types move wastewater. Qingdao Green Power's IS/ISW series is published at 1.5–1600 m³/h, heads of 2–125 m and power to 250 kW for water and low-viscosity liquids up to 80°C. Its verified centrifugal range covers the common sub-types:

See how positive displacement compares with centrifugal pumps before committing to a family — the operating principle decides curve behaviour, priming, pulsation and viscosity limit.

Positive Displacement Pump Types: Gear, Screw and Lobe

Positive displacement pump types earn their place wherever liquid is too viscous, too shear-sensitive or too thick for an impeller. The main rotating designs are:

• Gear pumps use meshing teeth to trap and carry liquid and suit clean oils, fuels and moderate viscosities at higher pressures.
• Screw pumps move liquid along one or more screw rotors. The G-type single screw (progressive cavity) pump handles high-viscosity, shear-sensitive and abrasive media such as sludge and slurry — Qingdao Green Power publishes it at 0.1–150 m³/h and 0.6–2.4 MPa — while the 3GB triple screw type serves low-viscosity oil at high temperature, up to 350°C. Screw pumps must never run dry: the rubber stator is destroyed within seconds. See the industrial screw pump range for heavy duties.
• Rotary lobe pumps use two synchronised, non-contacting rotors that trap liquid between the lobes and the casing; low shear and gentle handling make them the first choice for food, hygienic and polymer products. See the rotary lobe vs gear pump comparison.

Special-Duty Types: Chemical, Thermal Oil and Vacuum Pumps

Beyond the general families, several industrial pump types answer specific process problems. Chemical pumps solve corrosion: Qingdao Green Power offers IH stainless (SS304/SS316L) machines for dilute acids and mild chemicals and IHF fluoroplastic-lined pumps for strong acids and alkalis, spanning 3.5–400 m³/h at heads of 4.5–125 m. Thermal oil circulation pumps move heat transfer fluid from -20°C to 350°C — the RY series runs 1–500 m³/h at 1–12.5 bar with air-cooled housings, no external cooling water. Vacuum pumps create the vacuum used in filtration, distillation and degassing: the 2BV liquid ring type reaches 0.097 MPa absolute at 0.45–8.33 m³/min and tolerates wet, condensable vapours.

How to Match an Industrial Pump Type to Your Application

Start from the liquid and the duty, not from a catalogue. The deciding checks are stable across every manufacturer:

• Viscosity: below about 150 cSt consider centrifugal; above it move to gear, screw or lobe types — see viscous fluid pump selection.
• Flow and head: define the whole operating range; centrifugal types suit steady high flow, PD types suit metered flow and pressure.
• Liquid chemistry: match wetted materials and seals to corrosion and temperature before anything else.
• Solids and shear: open impellers pass solids, screw pumps handle slurries, lobe pumps protect shear-sensitive products.
• Suction and layout: check NPSH, priming for elevated tanks, and footprint for inline versus base-mounted machines.

A full industrial pump selection then weighs efficiency, life-cycle cost and serviceability; the industrial pump guide explains the sizing inputs in depth.

Frequently Asked Questions