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RO Membrane Pressure Vessels (Stainless Steel)
High-pressure stainless steel membrane housings for 4040 and 8040 RO, NF, and UF elements. Sanitary 304/316L construction with mechanical or electropolished interior. Single-element and multi-element (1–7) configurations.
Element Sizes
4040 / 8040 / 4021 / 2540
Elements/Vessel
1 to 7
Working Pressure
1.6 / 2.5 / 4.0 / 6.4 MPa
Material
304 / 316L stainless steel
Overview
RO membrane pressure vessels (housings) must withstand operating pressures of 1.5–6.8 MPa (220–1,000 psi) while maintaining sanitary conditions and sealing integrity over a 10+ year service life. Standard FRP (fiberglass) housings are widely used but cannot be steam-sterilized, are chemically limited, and cannot be inspected internally. HENG RONG stainless steel housings solve all three limitations — making them the specification of choice for pharmaceutical, beverage, dairy, and semiconductor pure water applications.
Engineering Features
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Sanitary Interior
Mechanical polish Ra ≤ 0.8 μm standard; electropolish Ra ≤ 0.4 μm for pharmaceutical. Internal surface is smooth, crevice-free, and fully drainable — passes pharmaceutical design requirements.
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High-Pressure Rating
Available in 1.6, 2.5, 4.0, and 6.4 MPa (240–930 psi) pressure classes for seawater RO (SWRO) and high-rejection applications.
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Side-Port & End-Port
Side-port (with brine seal) for multi-element vessels — standard for most industrial RO trains. End-port for single-element laboratory and polishing applications.
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Steam Sterilizable (SIP)
316L housings with tri-clamp connections and sanitary brine seals rated for 135°C steam sterilization. Required for pharmaceutical and aseptic applications.
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Full Documentation
Material test reports (3.1 certs), weld records, pressure test (1.5× WP), surface finish measurement, and dimensional inspection — complete QC package standard.
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Compatible with Major Brands
Accepts Dow/DuPont FILMTEC, Toray, Hydranautics, Nitto, CSM, and other standard 4040/8040 elements with no modification.
Technical Specifications
Typical Applications
- 💊 Pharmaceutical Purified Water — USP PW and WFI systems requiring steam sterilizable, CIP-compatible housings.
- 🥤 Beverage & Dairy — RO concentration and demineralization in beverage, juice, and dairy processing.
- 💻 Semiconductor UPW — High-purity water for wafer fabrication. Electropolished to minimize extractables.
- 🌊 Seawater Desalination (SWRO) — High-pressure (4.0–6.4 MPa) housings for seawater and brackish water systems.
- 🍺 Brewing & Spirits — Controlled RO demineralization for consistent water profile and product quality.
- 🏭 Industrial Demineralization — Boiler makeup, cooling tower treatment, and process water systems.
Frequently Asked Questions
Why choose stainless steel over FRP housings?
SS housings can be steam-sterilized, inspected, and cleaned with strong chemicals. They outlast FRP by 2–3× in corrosive service. Required by many pharmaceutical and food safety standards that specify metal construction.
What brine seal do you recommend?
We supply EPDM brine seals as standard. Viton (FKM) for high-temperature or chemical-resistant applications. PTFE-encapsulated for pharmaceutical applications with aggressive CIP chemicals.
Can I run SWRO membranes in your housings?
Yes. Our 4.0 MPa (580 psi) and 6.4 MPa (930 psi) rated housings are suitable for SWRO at 55–70 bar operating pressure. Specify SWRO service when ordering.
How are the vessels pressure tested?
Each vessel is hydrostatically tested at 1.5× maximum working pressure before shipment. Test records and test pressure are documented in the QC package.
Lead time?
Standard 4040/8040, 1–7 element: 20–35 days. Large custom bore or SWRO-rated: 30–50 days.
Often Specified Together
Water Softeners
Cartridge Filter Housings
Stainless Steel Tanks
Need a Custom RO Membrane Pressure Vessels (Stainless Steel)?
Send us your water analysis and required capacity. Our engineers will respond with a sized proposal and budget within 24 hours.
📧 sales@szhrscl.com | 📱 +86 138 2871 5252