In large-scale water treatment, industrial liquid purification, and high-purity chemical filtration systems, filtration efficiency and operating cost are two core indicators. Traditional single-cartridge or small-diameter filter housings, when dealing with high flow rates (e.g., 50-500 m³/h), often face challenges such as large footprints, frequent cartridge changes, and high flow path resistance. The High Flow Multi-Cartridge Housing is a professional solution designed precisely to solve these contradictions. By integrating 3 to 9 high-flow cartridges into a single compact pressure vessel, it achieves filtration capacities of several hundred cubic meters per hour.
As a professional water treatment equipment manufacturer, Hangzhou Shuidun Technology's high flow multi-cartridge housings embody a high degree of integration across fluid dynamics optimization, hygienic design, operational convenience, and safety reliability.
I. Product Positioning: A Paradigm Shift from "Single-Cartridge Series" to "Multi-Cartridge Parallel"
The core design concept of the high flow multi-cartridge housing is: to install 3, 5, 7, or 9 high-flow cartridges in parallel within a single housing. The advantages brought by this "multi-cartridge parallel" structure are unmatched by traditional multiple single-cartridge housings connected in parallel:
Footprint reduction of over 60%: A 9-cartridge housing provides the same filtration area as nine single-cartridge housings but occupies only one-third of the footprint.
Significantly lower pressure drop: Multi-cartridge parallel configuration substantially increases the total flow cross-sectional area, reducing flow velocity. The initial pressure drop is typically controlled within 0.2-0.5 bar, saving energy consumption of upstream pumps.
Centralized maintenance: Opening one housing cover gives access to all cartridges, eliminating the need to service multiple scattered filter housings individually.
Such equipment is typically designed for applications requiring high continuous operation, such as large-scale RO pretreatment, cooling tower side-stream filtration, oilfield injection water, and food/beverage clarification.
II. Core Features: Six-Dimensional Engineering Design Ensuring Efficiency and Stability
1. Compact and Efficient Housing Internal Flow Design
The internal flow path design directly affects filtration performance. Professional manufacturers like Shuidun Technology conduct precise Computational Fluid Dynamics (CFD) simulations:
Radial inlet/outlet layout: Raw water enters from the tangential or radial inlet on the housing side wall, distributes uniformly through the annular space between the cartridges and the housing wall, then flows from outside to inside through the cartridges. The filtered water collects into the center tube of each cartridge and exits through the top outlet. This design ensures that each cartridge receives a substantially consistent flow rate, preventing cartridges near the inlet/outlet from clogging prematurely due to excessive flow.
Flow deflector plate (optional) : A perforated deflector plate or baffle is installed at the inlet to prevent high-velocity fluid from directly impacting the cartridge surface, which could cause media damage or localized overloading.
Minimized dead zones: The housing bottom is designed with a conical shape or drain channel to ensure complete drainage of internal liquid during shutdown, preventing microbial growth or crystallization blockage from residual liquid.
2. High-Quality Stainless Steel Material and Surface Finishing
Since the filtered media is often corrosive (e.g., seawater, acidic/alkaline solutions, high-temperature water), housing material and surface finishing are critical to durability:
Standard materials:
304 Stainless Steel (S30408) : Suitable for neutral or mildly corrosive liquids (e.g., drinking water, general industrial water).
316L Stainless Steel (S31603) : Due to its molybdenum addition, it offers excellent resistance to chloride ion pitting corrosion. It is the preferred choice for seawater, saline wastewater, or high-purity water for injection.
Internal surface finishing: Depending on the application grade, options include:
Mechanical polishing (180-240 grit) : Suitable for general industrial use, Ra ≤ 0.8 μm, easy to clean.
Electropolishing (EP) : Used for pharmaceutical and electronic-grade water, Ra ≤ 0.4 μm. Electropolishing removes the iron-rich surface layer, forming a dense chromium oxide passive film that is 3-5 times more corrosion-resistant than mechanical polishing and does not adhere to microorganisms.
External surface finishing: Typically matte blasting or brushed finish, which is aesthetically pleasing and resistant to minor scratches. For outdoor or humid environments, pickling and passivation or epoxy coating can be selected.
3. Reliable Sealing and Closure Mechanism
Multi-cartridge housings operate under pressure (typically design pressure 6-16 bar). Sealing and closure are at the core of safety:
Cover closure methods:
Eye bolt quick-open type (common for 3-5 cartridges) : Multiple eye bolts evenly compress the cover, offering relatively quick operation.
Clamp quick-open type (high-end or larger cartridge counts) : Uses a single large opening clamp, requiring only loosening one nut or handle to open. Cover opening time is reduced to 1-2 minutes, significantly improving cartridge change efficiency.
Multi-bolt flange type: Used for very high pressures (>20 bar) or hazardous media, offering the highest safety but being more time-consuming to operate.
Cartridge sealing: Each cartridge forms a reliable seal with the socket in the housing base plate through double O-rings (NBR/EPDM/Viton) . This "push-in & twist" seal design ensures raw water cannot bypass the cartridge (short-circuiting).
Cover seal: Uses a radial or axial O-ring. Material is selected based on media temperature: EPDM (-30~120°C, hot water resistant), NBR (-30~100°C, oil resistant), Viton (-20~200°C, resistant to strong acids/solvents).
4. Flexible Compatibility with Various High-Flow Cartridges
One of the greatest advantages of high flow multi-cartridge housings is compatibility. They can accommodate mainstream high-flow cartridges from brands such as 3M High Flow, Pall Ultipleat, Parker, or Chinese national standards. Common cartridge lengths include:
20 inches (single-open / double-open)
40 inches (most common, largest filtration area)
60 inches
The socket base plate is replaceable or customizable to match the seal dimensions of different cartridge brands (e.g., 56mm, 62mm diameter). This standardized interface design prevents users from being locked into a single cartridge brand, facilitating annual bidding to reduce costs.
5. Comprehensive Auxiliary Ports and Safety Accessories
A professionally designed filter housing is not merely a container; it is a system component integrating multiple functional ports:
Vent valve: Located at the highest point of the cover, used to evacuate air before startup to prevent water hammer damage to cartridges.
Drain valve / drain port: Located at the lowest point of the housing, used to empty residual liquid during shutdown or to discharge cleaning wastewater.
Pressure gauge ports: Typically 1/4" or 1/2" NPT female threaded ports on both inlet and outlet, used to install pressure gauges or pressure transmitters to monitor differential pressure (ΔP) . When ΔP reaches a set value (e.g., 2.0 bar), it indicates the need for cartridge replacement.
Sampling valve port: Small-bore sampling valves can be installed on the inlet, outlet, or filtrate side for periodic water quality testing.
Pressure relief valve / rupture disc (optional) : In closed-loop systems or those where abnormal pressure rise is possible, safety devices are recommended to prevent overpressure accidents.
6. Surface Finishing and Hygienic Standards
For the food, beverage, and pharmaceutical industries, compliance with hygienic standards is a mandatory requirement:
Dead-leg free design: All liquid-contact welds must be ground and polished flush with the parent material (no pits) , with internal corner radii (R-angle) greater than 6mm to prevent material retention or bacterial harborage.
Welding standards: Use Tungsten Inert Gas (TIG) welding. Internal welds, whether automatic or manual, must undergo pickling and passivation to remove heat-tint discoloration in the heat-affected zone.
Certifications: Can provide surface roughness test reports, material certificates (3.1B EN10204) , and even perform blue spot tests to verify passive film integrity. Meets GMP or FDA indirect contact requirements.
III. Technical Specification Selection Reference
| Parameter | Typical Range | Description |
|---|---|---|
| Number of Cartridges | 3, 5, 7, 9 | More cartridges (e.g., 12, 15) are customizable, but housing diameter and cover weight must be considered |
| Cartridge Length | 20", 40", 60" | 40" offers the best cost-effectiveness, balancing filtration area and pressure drop |
| Housing Material | SS304, SS316L, CS (carbon steel rubber-lined) | Select based on media corrosivity; rubber-lined carbon steel is suitable for strong acids/alkalis at lower cost |
| Design Pressure | 6bar, 10bar, 16bar (150psi, 300psi) | 10bar (150psi) covers most water treatment scenarios |
| Design Temperature | 0-80°C (standard seals) / up to 150°C (Viton seals) | High temperatures require Viton or metal seals |
| Inlet/Outlet Connections | Flanges (HG/T20592, ANSI, DIN), Tri-clamp | Large sizes typically use DN80-DN200 flanges; hygienic versions use Tri-clamp |
| Surface Finishing | Mechanical Polish, Electropolish (EP) | Electropolishing offers superior corrosion resistance and easier cleaning |
| Reference Flow Rate | 3-cartridge (40"): ~30 m³/h; 9-cartridge (40"): ~90 m³/h | Actual flow depends on water quality, viscosity, and cartridge micron rating |
IV. Installation and Operation Key Points
Base support: High flow housings are heavy when full and must be installed on a level, solid concrete foundation or steel frame, secured with anchor bolts.
Piping stress: It is recommended to install flexible joints or natural compensation loops on inlet/outlet piping to prevent thermal expansion/contraction stresses from acting directly on the housing flanges, which could cause seal leakage or housing deformation.
Initial flushing: After installing new cartridges, the vent valve must be opened first, and water introduced slowly to evacuate all air from the housing before closing the vent valve. Then flush at a low flow rate for 5-10 minutes to wash away residual fines from the cartridge manufacturing process before switching to normal operation.
Pressure drop monitoring: It is recommended to record inlet/outlet pressures and differential pressure at least once a week. When ΔP reaches 1.5-2.0 bar, stop immediately and replace cartridges to avoid cartridge collapse or housing overpressure damage due to excessively high ΔP.
V. Maintenance and Care
Regular seal inspection: Each time the cover is opened for cartridge change, inspect the cover O-ring and cartridge socket O-rings for scratches, deformation, or hardening. It is recommended to replace sealing rings annually, or immediately upon discovering a leak.
Internal housing cleaning: Use a soft cloth and mild detergent to wipe the inner wall during cartridge changes, removing oil or deposits. Never use wire brushes or hard tools, as they will scratch the polished surface.
Bolt lubrication: For eye bolts or clamp bolts, regularly apply anti-seize compound (e.g., molybdenum disulfide grease) to prevent thread rusting and seizing in high-temperature or humid environments.
VI. Summary: The Reliable Core of High-Flow Filtration Systems
A high flow multi-cartridge housing is far from a simple "steel can." It is a process filtration core device integrating fluid dynamics optimization, material corrosion engineering, precision sealing technology, and ergonomic operational design. By scientifically arranging 3 to 9 high-flow cartridges in parallel within a single pressure vessel, it delivers an industrial-grade filtration solution characterized by high flow rate, low pressure drop, small footprint, and easy maintenance.
For water treatment engineering companies, plant operations departments, or equipment integrators, choosing a well-designed, reliably fabricated, and fully ported high flow multi-cartridge housing (such as those offered by Shuidun Technology) means:
Enhanced system stability: Uniform flow distribution extends cartridge life and reduces unplanned shutdowns.
Lower operating costs: Reduced pressure drop saves pump energy; standardized cartridge interfaces allow more flexible sourcing options.
Compliance and safety: Meets pressure vessel design standards (e.g., GB150, ASME VIII) and incorporates necessary safety accessories to protect personnel and equipment.
When your process requires treating hundreds or even thousands of tons of water/liquid per hour, and you seek the lowest total cost of operation, the High Flow Multi-Cartridge Housing will be the undisputed "core hub" of your filtration system.
