The high-pressure pump pressurizes pretreated feed water to membrane operating pressure (55–70 bar for SWRO, 10–17 bar for BWRO). The two dominant SWRO technologies are axial-piston (Danfoss APP) and multistage centrifugal (Grundfos BME, FEDCO MSS). A booster pump first lifts pretreated water to inlet pressure (3–5 bar NPSH). The HP pump then provides the bulk of the pressure rise. Discharge connects directly to the membrane array; control is by VFD or throttle valve. The HP pump is the single largest energy consumer in any RO plant. Its efficiency, materials (super-duplex SS for SWRO), and service life dominate total cost of ownership. Axial piston (90–92%) beats centrifugal (70–78%) at low flow (<100 m³/h). Above 250 m³/h, multistage centrifugal becomes more economical despite lower efficiency. Super-duplex 2507 stainless or titanium. Standard 316L fails in chloride service within 2–5 years. A Danfoss APP runs 50,000–80,000 hours between overhauls. Grundfos BME multistage typically 60,000+ hours when feed quality is well controlled. ForeverPure has supplied desalination, high-pressure pumps, and energy-recovery devices to commercial and industrial customers since 2003. Contact our engineers for sizing, quotes, or technical support.High-Pressure Pump (HP pump)
How It Works
Why It Matters
Related Products & Resources
Frequently Asked Questions
What's more efficient — piston or centrifugal HP pump?
What materials are required for SWRO HP pumps?
How long does an HP pump last?
Need Engineering Help?
