1. Technical challenges of hot water pumping
Pumping hot water requires attention to three variables that do not exist (or are negligible) in cold water pumping: vapor pressure increases with temperature, reducing available NPSH and increasing cavitation risk; thermal expansion of components requires adequate clearances; and sealing materials (mechanical seal elastomers) have temperature limits that define the sealing configuration.
2. Typical hot water pump applications
The main hot water pump applications in industry include:
- Boiler recirculation — feed and return water in steam generation plants. Typical temperature: 80-180°C.
- Cooling towers — hot circuit circulation between heat exchangers and tower. Typical temperature: 30-60°C.
- Industrial HVAC — air conditioning for large buildings, hospitals, data centers. Closed chilled/hot water circuit. Temperature: 5-80°C.
- Condensate return — returning condensate to boiler. Temperature up to 100°C, low pressure.
3. How to select the hot water pump
Correct selection requires attention to NPSH: with water at 90°C, vapor pressure is ~0.7 bar, significantly reducing available NPSH compared to cold water. The pump must be positioned below reservoir level and the suction must have minimum length and adequate diameter to minimize losses.
Send FB Bombas: flow (m³/h), pressure (bar), operating and maximum temperature, fluid type (pure water, treated water, water with inhibitors), desired material and available NPSH. Our engineering selects the ideal FBCN model and sealing configuration.