Pumps
Pumps move the water through everything else. Every filter, sterilizer, heat exchanger, and return line in a life support system depends on a pump delivering the right flow at the right pressure, continuously, for years.
Pumps in an aquatic life support system provide circulation, transfer and process flow, and are selected on the system head calculation at the specified flow; when the head calculation is wrong nothing downstream can compensate.
What pumps do in a life support system
Circulation pumps drive the main treatment loop, pulling from the habitat or sump and pushing water through filtration and back. Transfer pumps move water between vessels. Process pumps serve individual pieces of equipment, a fractionator feed, a backwash supply, a chemical injection skid.
Most systems run duty and standby pumps. When the duty pump fails in the middle of the night, the standby carries the animals until someone arrives.
Where they’re used
Aquarium and zoo exhibit systems. Recirculating aquaculture. Hatchery raceways. Water park and surf park circulation. Fountains and water features. Pond and lagoon circulation.
Why specification matters
Pump selection is a common source of aquatic-system performance problems. The failure is not always dramatic; it may appear as a system that never quite reaches its required turnover or operating point.
Total dynamic head is usually underestimated. Static lift is the easy part. What gets missed is friction loss through filter media, UV chambers, heat exchangers, and every fitting between the pump and the return. A pump specified against static head alone will underdeliver once the system is full and the filters start loading.
The operating point moves. A sand filter’s head loss climbs steadily between backwashes. A pump selected at the clean-filter operating point runs somewhere else entirely at the end of the cycle. The curve has to be read across the whole range, not at one point.
Materials are not interchangeable. Seawater, ozonated water, and elevated temperature each rule out materials that are fine elsewhere. Wetted components, seals, and elastomers all need checking against the actual water chemistry, not against a generic aquatic spec.
NPSH available has to exceed NPSH required, with margin. Cavitation destroys impellers, and in a flooded-suction arrangement with a long strainer run it is easier to get wrong than it looks.
Variable frequency drives change the calculation. VFDs offer real energy savings on systems with variable demand, but they interact with minimum flow requirements and with any equipment downstream that needs a stable flow rate to perform.
How SIVAT helps
We work from your drawings and equipment schedule rather than from a model number. We review the specified duty point against the system as drawn, flag where the head calculation looks light, confirm material compatibility with the water chemistry, and price pumps that meet the requirement.
Where a schedule specifies a pump that has been superseded or is on a long lead time, we say so during the bid, not during buyout.
Equipment these systems use
Where this equipment is used
- Zoos & AquariumsExhibit life support, quarantine and holding, across marine and freshwater habitats.
- Aquaculture & FisheriesRecirculating systems, hatcheries and research facilities, where water quality limits production.
- Water ParksRegulatory code-driven turnover, filtration and treatment for commercial aquatic attractions.
- Surf ParksLarge-volume circulation and filtration for wave lagoons, at a scale where equipment selection carries real cost.
Pricing pumps on a project?
Send us the plans, specifications, or equipment list. An experienced aquatic equipment specialist will review the project requirements, identify the system needs, and provide clear, competitive pricing.