4021 RO Membrane Housing
Material: FRP
Operating Temp Range: 2°C ---59°C
Operating pH Range: 3 – 11
Cleaning pH Range: 2 – 12
Number of elements: 1-6
Product Overview
The 4021 RO Membrane Housing is a critical component for reverse osmosis (RO) water treatment systems, designed to protect and secure 4-inch diameter × 21-inch length RO membrane elements. Constructed with computer-controlled fiberglass (FRP) winding and ABS end caps, it balances high-pressure resistance (up to 300PSI) with lightweight durability, solving common pain points like leakage risks, compatibility issues, and maintenance delays.
Ideal for commercial and small industrial RO systems (e.g., 500-2000LPH), this housing ensures stable performance in harsh water conditions (acids, alkalis, high temperatures) while simplifying membrane replacement.
Key Features
✅ High-Pressure Safety (Prevent Leakage)
- 300PSI Working Pressure: Reinforced FRP winding structure withstands RO system pressure spikes, eliminating burst risks common with plastic housings.
- Double-Seal Design: EPDM O-rings + threaded end caps ensure 100% leak-proof operation, critical for pure water production.
✅ Universal Compatibility (Avoid Model Mismatch)
- Fits All 4" RO Membranes: Compatible with 4021/4040 membranes from brands like Dow, Hydranautics, Vontron, and Toray-no need to replace housings when switching membrane suppliers.
- Standard 1/2"NPT Ports: Matches most RO system piping, reducing adapter costs and installation errors.
✅ Quick Maintenance (Save Downtime)
- Tool-Free End Cap Removal: ABS end caps with hand-tightened bolts allow membrane replacement in 5 minutes (vs. 30+ minutes for metal housings).
- Smooth Internal Surface: Prevents membrane scuffing during installation, extending membrane lifespan by 20%.
✅ Long-Lasting Durability (Reduce Replacement Costs)
- FRP Material: Resists corrosion from chlorides, sulfates, and industrial chemicals-service life >15 years (3x longer than PVC housings).
- UV-Resistant Exterior: Withstands outdoor installation in hot/humid climates without cracking or fading.
Specifications of 4021 RO Membrane Housing
1) Housing material: FRP
2) End cap material: ABS
3) Maximum working pressure: 300PSI, 450PSI, 600PSI, 800PSI, 1000PSI
4) Working temperature: 2°C ---59°C
5) Water inlet: 1/2" internal thread
6) Water outlet: 1/2" internal thread
7) Model: 4021, 4040, 4080, 40120, 40160
Parameters:
| Model | 4021 RO Membrane Housing |
| Number of Membranes | 1 |
| Membrane Diameter (inch/mm) | 4 / 101.60 |
| Membrane Length (inch/mm) | 21 / 533.40 |
| Feed Connection (inch) | 1/2'' Female NPT |
| Permeate Connection (inch) | 1/2'' Female NPT |
| Concentrate Connection (inch) | 1/2'' Female NPT |
| Maximum Operating Pressure (psi/bar) | 300 / 21 |
| Minimum Operating Temperature (F° / C°) | 35 / 2 |
| Maximum Operating Temperature (F° / C°) | 150 / 66 |
Applications of membrane Housing
Restaurants/Hotels
Protects RO membranes in drinking water systems, ensuring consistent purity and reducing maintenance calls.
Small-scale RO Plants
Ideal for 500-2000LPH systems (e.g., bottled water, car washes) where space and cost are critical.
Electronics/Pharmaceuticals
Maintains stable pressure for high-purity water, avoiding membrane damage from pressure fluctuations.
Chemical Processing
Corrosion resistance ensures compatibility with aggressive pre-treatment chemicals (e.g., acids for pH adjustment).
Boat/Rig Water Systems
Lightweight design reduces vessel load, while FRP material resists saltwater corrosion.
FAQ
Will this housing fit my 4040 membrane?
A: No. 4021 is designed for 21-inch long membranes (e.g., 4021, 4021-FF). For 40-inch membranes, choose our 4040 RO Membrane Housing.
Can it handle 450PSI pressure for seawater RO?
A: Yes. We offer a 450PSI high-pressure version (model 4021-HP) for seawater and brackish water applications. Contact us for details.
How often should I replace the O-rings?
A: Replace EPDM O-rings every 12-18 months (or during membrane replacement) to maintain leak-proof performance. We include free O-ring kits with bulk orders.
Is installation difficult for DIY users?
A: No. The housing comes with a user manual and pre-assembled end caps. Simply align the membrane, hand-tighten the bolts, and connect the pipes-no special tools needed.
What's the warranty for this housing?
A: We provide a 5-year warranty against material defects and manufacturing errors, plus lifetime technical support for installation issues.
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