Chilled water pumps — primary, secondary and tertiary loop pumping
Source chilled water pumps for HVAC and process cooling: end-suction, inline, vertical multistage and split-case configurations with IE4/IE5 motors and VFD control. Grundfos, KSB, Wilo, Xylem, Armstrong, Sulzer and more.
- Flow 5–5,000 m³/h, head 10–100 m, up to 400 kW motor
- EN 733 / ISO 2858 hydraulic standards, cast iron or stainless
- IE4/IE5 motors, VFD-ready, EC or PM synchronous options
- Primary/secondary decoupled and variable-primary designs
- Complete pump skids with strainers, isolation and expansion
Sizing & procurement
Chilled Water Pumps — frequently asked
Primary/secondary vs variable-primary?
Variable-primary saves 20–30% pumping energy and reduces installed pump count, but requires modern chillers with low minimum flow and DP-controlled VFDs. Primary/secondary is safer for legacy chiller plants and mixed vintages.
How do I size a chilled water pump?
Flow (m³/h) = Q(kW) ÷ (1.163 × ΔT). Head = static + longest-run friction + coil/valve ΔP. Add 10% margin, pick pump at BEP with VFD headroom.
Cast iron or stainless steel?
Cast iron is standard for closed-loop chilled water. Stainless (bronze fitted or 316) for open loops, seawater, or aggressive glycol concentrations above 40%.
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