R hot water centrifugal pump

Single-stage (and two-stage) cantilever centrifugal hot-water circulation pump designed for high-temperature, high-pressure hot water services (no solids). Engineered for continuous circulation duties in heavy industry — metallurgy, power stations, chemical plants, plastics, rubber, textiles, paper and wood processing, and building heating systems.

Key features

• Rated fluid: clean hot water (no solid particles). Maximum operating temperature up to 250 °C.
• Inlet / outlet orientation: axial horizontal suction inlet; vertical upward discharge.
• Construction: pump casing, impeller, shaft, cooling chamber, suspension/bracket, sealing components and sealing rings assembled with bolted connections.
• Drive: directly driven by an electric motor via elastic coupling; rotation is clockwise when viewed from the drive end.
• Impeller: statically balanced; fixed on shaft with impeller nut and shaft sleeve; some impellers include back blades to help balance axial thrust.
• Bearings: shaft supported on the suspension by a pair of single-row thrust radial ball bearings plus a single-row radial ball bearing (or single-row cylindrical roller bearing) to carry radial and axial loads.
• Sealing options: gland packing or high-temperature mechanical seals; floating ring seal is available for heavy-duty applications. Seal assemblies and suspensions include dedicated cooling chambers.
• Cooling: floating ring and suspension cooling chambers accept external cooling water flow; recommended external cooling water volume 0.3–0.6 m3/h.

Performance and limits

• Designed for hot water circulation duties with temperatures up to 250 °C.
• Inlet pressure ratings vary by configuration; some variants are rated up to 5.0 MPa while typical allowable inlet pressure is up to 3.0 MPa — confirm required pressure class when specifying.
• Not suitable for fluids containing abrasive or large solid particles.

Materials and pressure classes

• Materials for main components are provided by pressure class: Class I: QT500-7; Class II: ZG230-450; Class III: ZG3Cr13. Select material class based on fluid temperature, pressure and corrosion/erosion conditions.

Model coding (example)

• Example: 100R-37A
  • 100 = inlet diameter (mm)
  • R = hot-water circulation pump type
  • 37 = pump design-point head (m)
  • A = impeller outer-diameter variant

Ordering guidance

• When enquiring or ordering, provide: required flow (m3/h), required head (m), operating temperature, maximum inlet pressure, required material class, seal type (gland or mechanical), motor speed (rpm) and flange/inlet size. This ensures correct configuration (single-stage vs two-stage, bearing selection, seal and cooling arrangements).

Applications

• Ideal for circulating and transporting high-temperature hot water in industrial heating loops, heat exchangers and process circulation systems in metallurgy, power generation, chemical processing and large HVAC/industrial heating installations.