Why Choose Nanofiltech NAFIL-C Regular Dust Filter Cartridge in Shipyards?
Created on 09.16
In the shipbuilding industry—especially during fiberglass/composite hull manufacturing and repair—there is a significant generation of fine, lightweight dust that is difficult to settle. Processes such as cutting, grinding, polishing, drilling, and slotting release fiber fragments and fine dust particles into the air. These dusts not only pose health risks to workers and affect visibility, but they can also enter equipment and electrical control cavities, leading to potential hazards and increased maintenance costs. Therefore, an efficient dust collection system with a stable low-pressure drop is critical to the ventilation and dust removal process in shipyards.
Why Nanofiltech NAFIL-C Regular, Not "Other Solutions"?
Compared to "Deep Filtration" Materials (Common Cellulose/Synthetic Fibers):
1. Glass fiber dust has "barbed/short fiber" properties, which can easily embed deep into the filtration media, leading to "irreversible clogging" and a rapid increase in pressure drop.
2. The Nanofiltech NAFIL-C utilizes nanofiber membranes for surface filtration: Fine dust is captured on the surface layer of the fibers, which can be easily removed during pulse cleaning. This keeps the base material clean, resulting in slower pressure drop increases, lower energy consumption, and longer service life.
Compared to Bag Filters or Wet Scrubbers:
1. Bag filter systems, at the same airflow volume, are bulkier, requiring more time for bag replacement and offline maintenance. They still face the issue of "deep penetration" for fine fiber dust.
2. Wet scrubbers are effective for water-soluble or easily captured dust but are not optimal for the mixed glass fiber and resin dust common in shipyards. Additionally, they introduce issues like wastewater treatment and corrosion.
3. The Nanofiltech NAFIL-C filter is compact, with quick installation and excellent sealing, making it suitable for various shipyard workstations, including grinding booths, local collection units, and Compared to "End HEPA Filters":
1. End HEPA filters are often used at the final polishing or rework stations for fine dust control. However, simply adding a HEPA filter does not replace the need for efficient upstream dust collection.
2. Using Nanofiltech NAFIL-C as the main filtration stage achieves low-pressure drop and high-efficiency surface filtration, which significantly reduces the load and replacement frequency of downstream HEPA filters, resulting in a lower overall operational expenditure (OPEX) for the system.
Why Does Nanofiltech NAFIL-C Fit Shipyard "Grinding and Repair" Ventilation and Air Change Needs?
Shipyard workstations typically employ local exhaust ventilation (LEV) strategies, with grinding hoods, arm-style air suction arms, and negative pressure slots at grinding tables, supplemented by room air changes (ACH). For these "continuous, fine, widespread dust generation" operations, the filtration system must meet the following criteria:
l Stable Low Pressure Drop: The surface filtration mechanism of Nanofiltech NAFIL-C reduces deep dust adhesion, and after pulse cleaning, the pressure drop recovers more significantly, maintaining stable airflow.
l Repeatable Cleaning and Easy Maintenance: Pulse jet cleaning quickly removes dust from the filter surface, allowing the cartridge to be reused multiple times; modular replacement shortens downtime.
Adaptable to Different Air Change Strategies:
l For closed or semi-closed grinding rooms, a specific number of air changes (e.g., medium air change rate) is combined with local source capture for overall control.
l In open segmented workshops, local collection and workstation airflow are relied upon to ensure a balance between face velocity and suction at capture points.
Nanofiltech NAFIL-C provides various specifications and airflow ratings to match local airflow or room air change designs.
Summary: In shipyard environments with "long-term, continuous grinding + high fine dust content," Nanofiltech NAFIL-C’s surface filtration + pulse regenerable combination maintains stable airflow, reduces energy consumption, and extends filter life far more effectively than deep filtration materials, wet scrubbers, or simply adding end HEPA filters.
Filtration Performance and Standards: Evaluating "Right Parameters" for the "Right Conditions":
l MERV (ASHRAE 52.2): Industrial dust filtration is typically evaluated using MERV ratings for their efficiency against different particle sizes. The higher the MERV number, the better the filtration of finer particles.
l Nanofiltech NAFIL-C’s nanofiber membrane ensures that fine dust stays on the surface layer, achieving a balance between high efficiency and low pressure drop without sacrificing airflow.
l Filtration Precision: Standard factory precision is 3–5 μm; custom solutions can be provided in the range of 0.1–10 μm, especially for applications with high levels of polishing fine dust or stringent cleanroom requirements in downstream operations (e.g., precision equipment or pre-spraying areas).
In Shipyard Workstations: Matching "Air Changes/Airflow" with Nanofiltech NAFIL-C Selection:
The process typically uses airflow Q, face velocity v, and air-to-cloth ratio (A/C) to match the number and model of filter cartridges.
Practical Approach (Example):
1. First, determine the local capture airflow (Q) for the workstation (e.g., a grinding table with 2,000–2,400 m³/h).
2. Select an appropriate filter cartridge specification that matches the rated airflow and ensures a reasonable A/C ratio (for fiberglass dust, it is recommended to choose a more conservative A/C to delay pressure drop increase).
3. Set up pulse cleaning (ideally differential or zoned cleaning) to reduce airflow fluctuations.
4. Allow for maintenance windows to facilitate quick installation and sealing, reducing secondary dust generation.
Examples of Common Specifications for Understanding (not the only selection):
l 325×220×660 mm (S≈13 m², rated airflow 696–2400 m³/h): Suitable for individual workstations or small grinding rooms.
l 325×220×900 mm (S≈18 m², rated airflow 949–3273 m³/h): Suitable for medium airflow workstations or combined dual workstations.
l 325×220×1200 mm (S≈24 m², rated airflow 1265–4363 m³/h): Suitable for high-load continuous grinding or multiple parallel dust collection units.
Tip: If the dust contains high amounts of adhesive resin, consider PTFE coating or nanofiber solutions to improve surface release; if the dust has a high moisture content, pre-separation (e.g., spark arrestor/inertial separation) can help reduce the burden on the main filtration stage.
Structural and Material Details: The "Last Mile" to Long-Term Stability
l Filter Media: Options include polyester fiber, polyester-coated (PTFE), wood pulp fiber, or nanofiber. For fiberglass dust, prioritize nanofiber or PTFE coatings for optimal cleaning and clog resistance.
l End Caps: Galvanized steel or fingerprint-resistant steel; Mesh Guard: Galvanized diamond mesh; Separator Lines: Hot-melt glue; Sealing Glue: Polyurethane.
l Applicable Temperature: ≤135°C, covering most shipyard grinding, polishing, and cutting dust conditions.
l Installation & Maintenance: Quick installation structure with excellent sealing to reduce downtime and secondary dust risks.
Final Conclusion
In the "cutting, grinding, polishing" continuous dust-generating operations in shipbuilding, the Nanofiltech NAFIL-C Regular Dust Filter Cartridge provides a combination of nanofiber surface filtration and pulse regenerable cleaning to achieve high dust collection efficiency, stable low-pressure drop, and easy maintenance—making it a far more practical and reliable solution than deep filtration materials, wet scrubbers, or simply relying on end HEPA filters.
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Factory Ⅰ：No.7, No.4885 of Pingshan Rd., Pinghu, Jiaxing ,Zhejiang, China
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HQ: Room 907, Tower A, No. 999 Jinzhong Road, Changning, Shanghai, China
Factory Ⅰ：No.7, No.4885 of Pingshan Rd., Pinghu, Jiaxing ,Zhejiang, China
Factory Ⅱ: A06, Tuolingtou Industrial Zone, Yangquan, Shanxi, China
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