Pumps & Rotating Equipment
Liquid-transfer and dosing equipment, with mechanical components for rotating machinery. Select by duty and fluid conditions before selecting a size or model.
Centrifugal pumps
Centrifugal pumps move liquid by transferring energy from a rotating impeller to the fluid. Their performance is described by a pump curve linking flow and head, with efficiency and suction requirements varying across the operating range.
Process transfer, cooling-water circulation, pipeline boosting and water injection are common duties. Fluid properties and the system resistance determine the operating point.
End-suction, between-bearings and vertical arrangements address different installations. Compare duty point, available NPSH, wetted materials, seals and driver requirements.
Positive displacement pumps
Positive displacement pumps move a defined volume of fluid through repeated mechanical cycles. Reciprocating and rotary designs are used where pressure, viscosity or controlled delivery make the pumping mechanism important to the duty.
Typical applications include viscous-liquid transfer, lubrication systems and high-pressure process services. Fluid cleanliness and solids affect the suitable internal clearances and materials.
Gear, screw, plunger and progressing-cavity pumps have different operating characteristics. Selection includes flow variation, pulsation, drive speed and the system's pressure-protection arrangement.
Metering and dosing pumps
Metering pumps deliver controlled quantities of a liquid into another process stream. A dosing system combines the pump with suitable valves, controls and materials to achieve the required delivery range for a particular chemical.
Chemical injection, corrosion control and water treatment commonly use dosing pumps. The chemical concentration and required dosage establish the minimum and maximum delivery rates.
Diaphragm and plunger arrangements, manual adjustment and electronic control are common options. Check discharge pressure, turndown, wetted materials and dosing accuracy requirements.
Submersible and vertical pumps
Submersible pumps operate with the pumping assembly immersed in liquid. Vertical pumps use a vertical shaft or installation arrangement to suit deeper intakes, sumps and restricted footprints; these terms describe overlapping but different design features.
Water intakes, drainage, cooling-water systems and tank or sump duties use these arrangements. Installation depth and the properties of entrained solids influence selection.
Compare setting length, pump diameter, mounting, motor location and cable arrangements. Fluid level variation and the required suction conditions should be included in the design basis.
Seals, couplings and bearings
Seals control leakage, couplings transmit torque between shafts, and bearings support rotating elements. These components perform different functions but must work together within the machine's alignment, loading and lubrication arrangement.
Pumps, compressors, turbines and industrial drives use these parts during new assembly and maintenance. Replacements usually depend on exact machine and component identification.
Dimensions alone may not establish interchangeability. Material, speed, load, seal configuration and the manufacturer's part revision help distinguish otherwise similar components.
Vacuum pumps and ejectors
Vacuum pumps remove gas from an enclosed system to create or maintain a pressure below atmospheric pressure. Ejectors achieve gas entrainment using a motive fluid, while mechanical vacuum pumps use rotating or reciprocating components.
Process evacuation, degassing, vacuum distillation and condenser duties require different suction pressures and gas-handling capacities. Condensable vapors can change the required arrangement.
Liquid-ring, dry mechanical and ejector systems differ in utility use and fluid compatibility. Compare gas load, suction conditions, contamination and discharge treatment requirements.