Refrigeration pumps — NH₃ liquid overfeed, CO₂ and glycol circulation
Source specialist refrigeration pumps: hermetic and canned-motor pumps for ammonia liquid overfeed, high-pressure pumps for pumped CO₂ circulation and glycol/brine pumps for secondary refrigerant loops.
- Hermetic / canned-motor ammonia pumps — zero shaft leakage
- Pumped CO₂ liquid circulation for large transcritical plants
- Glycol and brine pumps for secondary loops and IQF tunnels
- Materials: stainless steel, no copper alloys for NH₃
- Witt, Hermetic, Teikoku, Cornell, Grundfos, KSB and more
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Refrigeration systems
Sizing & procurement
Refrigeration Pumps — frequently asked
Why hermetic pumps for ammonia?
Canned-motor and magnetic-drive hermetic pumps eliminate shaft seals — the main failure and leakage point on toxic and flammable refrigerants. They also survive liquid slugging and dry running better than sealed pumps.
What's the overfeed ratio for NH₃ pumps?
Typical liquid overfeed ratio is 3:1 to 4:1 for flooded coils — pump three to four times the evaporated mass so coils stay wetted, improving heat transfer 20–30% vs DX.
Do you supply pumps for pumped CO₂ systems?
Yes — high-pressure hermetic pumps rated for 40–60 bar liquid CO₂ circulation on medium/low temperature transcritical booster and cascade systems, from Witt, Hermetic and other specialists.
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