National Pump Company Highlights Low NPSH Impeller Options for Cooling Tower Applications at AHR Expo 2026

National Pump Company (NPC) will be highlighting its expanding lineup of low NPSH impellers for HVAC, cooling tower, and industrial cooling applications at the AHR Expo 2026. At booth C6547, the company will showcase a model pump and discuss system-level solutions developed in collaboration with Patterson Pump Company, focusing on reducing sump depth, simplifying installations, and improving lifecycle performance in demanding cooling tower environments.

Low NPSH impeller performance remains a big design challenge in cooling tower and condenser water systems, particularly where space constraints, shallow basins, or retrofit conditions limit available suction head. NPC's vertical turbine pumps are designed to address these conditions by combining application-specific hydraulic selection with materials and configurations that match water quality, system demand, and long-term operating requirements.

What's New and Highlighted at AHR Expo 2026

NPC continues to expand its low NPSH impeller portfolio, giving engineers more flexibility to balance NPSHA requirements with efficiency and overall system performance.

Recent low NPSH impeller releases (2024–2025):

• L8HC-S
• M14XXHC-S
• M12HC-S
• H14XHC-S

These newer designs build on NPC's installed base and are intended for cooling tower applications where reduced sump depth and improved suction performance can lower civil costs and simplify system layouts.

Legacy low NPSH first-stage impeller models:

• K20HC-S
• H24MC-S

These models remain widely used in installed cooling tower systems and continue to support a broad range of frame sizes and operating conditions.

Impellers in development (2027):

• KK10LS
• DH16FS

These future designs expand NPC’s roadmap for low NPSH solutions, targeting additional configurations and operating ranges as cooling system requirements continue to evolve.

Designed for Flexibility in Cooling Tower and HVAC Systems

NPC's low NPSH approach allows users to pair a low NPSH first-stage impeller with standard or high-efficiency impellers in downstream stages. This configuration helps meet suction requirements while maintaining overall hydraulic efficiency and reducing lifecycle costs.

Across its HVAC, cooling, and data center portfolio, NPC also offers vertical turbine pumps covering 6 to 30 inch bowls, flows up to 20,000 gpm, heads to 1,200 psig, and motor sizes up to 2,500 hp. Options include standard and thrust-balanced hydraulics, along with multiple low NPSH impeller configurations to address challenging system layouts.

All NPC pumps are engineered and manufactured under an ISO 9001-certified quality management system at the company's Glendale, Arizona facility and are tested in accordance with Hydraulic Institute standards.