Which High-Pressure Pump Is Used for RO Plants in India?
SEW VANGUARD Series triplex plunger pumps are used as high-pressure feed pumps for reverse osmosis (RO) systems and water treatment plants across India. These pumps generate 10–200 bar feed pressure required to push water through RO membranes, handling flows from 10 to 500 LPH. API 674-compliant construction ensures reliability in continuous water treatment duty.
India's water treatment sector — municipal water plants, industrial effluent treatment, pharmaceutical purified water systems, food-grade water processing — relies on triplex plunger pumps for consistent high pressure with minimal pulsation.
Why Triplex Plunger Pumps for RO High-Pressure Feed
RO membranes require steady, precise feed pressure. Pressure fluctuation damages membranes and reduces separation efficiency. Triplex plunger pumps deliver this because:
- Three cylinders firing at 120° phase offset produce low pulsation (pulsation index <5%)
- Positive displacement design maintains pressure regardless of viscosity changes
- Ceramic-lined plungers and hardened valve seats handle mineral-laden feedwater without wear
- Flow rate adjustable via stroke length or VFD-controlled motor speed
VANGUARD Series: RO & Water Treatment Models
Water Treatment Applications
- Industrial RO systems: Boiler feed water, cooling tower makeup water, process water
- Municipal water treatment: Desalination pre-treatment, brackish water RO
- Pharmaceutical purified water: USP-grade PW systems requiring low pulsation
- Effluent treatment plants (ETP): Zero liquid discharge (ZLD) high-pressure feed to RO stage
- Food & beverage: FSSAI-compliant water treatment for food-grade water supply
RO Pump vs. Centrifugal Pump: Comparison
India-Specific Compliance
- API 674 positive displacement pump standard compliance
- SS 316L or Duplex Stainless Steel wetted parts (corrosion-resistant for RO service)
- PTFE-lined valve seats for chlorinated water compatibility
- Suitable for IS 14489 (water treatment equipment) applications
Frequently Asked Questions
What pressure does an RO high-pressure pump need to generate?
Depends on feed water TDS and membrane type. Brackish water RO: 10–25 bar. Seawater RO: 55–80 bar. Industrial high-rejection RO (ZLD): 60–120 bar. VANGUARD Series covers all ranges.
Do triplex pumps need a pulsation dampener for RO service?
Recommended for sensitive membrane systems. VANGUARD Series has low inherent pulsation (three-cylinder design). Adding a bladder-type dampener reduces pulsation to <1% — protects RO membranes and flow meters.
Can VANGUARD pumps handle seawater or high-TDS feed water?
Yes, with Duplex SS (2205) wetted components and PTFE valve seats. Specify feed water TDS and chloride content at order stage. SEW offers seawater-grade configurations.
What cities does SEW supply water treatment pumps to?
SEW supplies VANGUARD Series pumps to water treatment projects across Nashik, Pune, Mumbai, Ahmedabad, Hyderabad, Bangalore, Chennai, and Delhi NCR. Spare kits and service available nationally.
Request a Quote from SEW — Contact us with your RO system capacity, feed water TDS, and required pressure. We respond within 24 hours.
