BW30-440i

Summary

Product identification

The DOW™ FILMTEC™ BW30-440i element is a high-productivity reverse osmosis element combining high active membrane area with the high rejection BW30 membrane. It includes iLEC™ interlocking endcaps.

• Membrane Type: Polyamide Thin-Film Composite
• Features:
  • Produces 10% more water compared to the DOW FILMTEC BW30-400 element at the same operating pressure and high rejection, enabling lower capital expense for new systems, or increased water production in an existing system.
  • Includes iLEC™ interlocking endcaps, which reduce system operating costs and the risk of o-ring leaks that can cause poor water quality.
  • Designed using an industry standard 1.125 inch ID permeate tube for interchangeability with other brackish water elements.

Product Specifications

Standard Conditions: Permeate flow and salt rejection based on 2,000 ppm NaCl, 225 psi (15.5 bar), 77°F (25°C), pH 8 and 15% recovery. Flow rates for individual elements may vary but will be no more than 15% below the value shown. Active area guaranteed +/-3%.

Mechanical / hydraulic

Dimensions – inches (mm)

• A (Net length connected): 40.0 (1,016)
• B (Individual element length): 40.5 (1,029)
• C (Outer diameter): 7.9 (201)
• D (Permeate tube ID): 1.125 (29)

Element to fit nominal 8.0-inch (203 mm) I.D. pressure vessel.

Operating limits

• Maximum Operating Temperature: 113°F (45°C) (Note: Maximum temperature for continuous operation above pH 10 is 95°F (35°C))
• Maximum Operating Pressure: 600 psig (41 bar)
• Maximum Pressure Drop: 15 psig (1.0 bar)
• pH Range, Continuous Operation: 2 - 11
• pH Range, Short-Term Cleaning (30 min.): 1 - 13
• Maximum Feed Flow: 85 gpm (19 m³/hr)
• Maximum Feed Silt Density Index: SDI 5
• Free Chlorine Tolerance: <0.1 ppm (Note: Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Dow recommends removing residual free chlorine by pretreatment prior to membrane exposure.)
• Maximum pressure drop across an entire pressure vessel (housing): 50 psi (3.4 bar)

General Information

• Keep elements moist at all times after initial wetting.
• Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning or other sequences to prevent possible membrane damage.
• During start-up, a gradual change from a standstill to operating state is recommended: Feed pressure should be increased gradually over a 30-60 second time frame. Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds. Permeate obtained from first hour of operation should be discarded.
• To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution.
• Avoid static permeate-side backpressure at all times.

Regulatory Note

These membranes may be subject to drinking water application restrictions in some countries: please check the application status before use and sale. The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet