FilmTec™ Seamaxx™

Summary

Product identification

DOW FILMTEC™ SEAMAXX™ Elements are premium spiral-wound seawater reverse osmosis (SWRO) elements, utilizing a polyamide thin-film composite membrane. They are designed for seawater systems operating at low- to medium-levels of salinity and temperature, as well as for brackish water with relatively high salinity.

Key features include:

• A 28-mil feed spacer for low differential pressure, low cleaning frequency, and high cleaning efficiency.
• iLEC™ Interlocking Endcaps to reduce system operating costs and the risk of O-ring leaks.
• An oxidative-free membrane manufacturing process for high membrane robustness and long-term stable performance.
• The widest pH range for cleanings (pH 1 – 13) for effective cleaning even with severe fouling.
• Automated, precision fabrication resulting in a greater number of shorter membrane leaves, reducing fouling while maximizing element efficiency.

Product Specifications of Standard Test, performed at 600 psi (4.1 MPa)

• DOW FILMTEC™ Element: SEAMAXX™
• Active Area: 440 ft² (41 m²)
• Feed Spacer Thickness: 28 mil
• Permeate Flow Rate: 9,050 GPD (34.2 m³/d)
• Stabilized Boron Rejection: 81.8%
• Stabilized Salt Rejection: 99.47%

Test conditions for the above values: 32,000 ppm NaCl, 600 psi (4.1 MPa), 77°F (25°C), pH 8 and 8% recovery.

• Permeate flows for individual elements may vary ± 15%.
• Minimum Salt Rejection is 99.25%.
• Specific boron stabilized rejection is based on 32,000 ppm NaCl, 5 ppm boron, 600 psi (4.1 MPa), 77°F (25°C), pH 8 and 8% recovery.

Expected Performance at Common Standard Test Conditions: 800 psi (5.5 MPa)

• DOW FILMTEC™ Element: SEAMAXX™
• Active Area: 440 ft² (41 m²)
• Feed Spacer Thickness: 28 mil
• Permeate Flow Rate: 17,000 GPD (64.4 m³/d)
• Stabilized Boron Rejection: 89%
• Stabilized Salt Rejection: 99.70%

The above values are normalized from the 600-psi specification standard test to the following conditions: 32,000 ppm NaCl, 800 psi (5.5 MPa), 77°F (25°C), pH 8 and 8% recovery.

• Permeate flows for individual elements may vary ± 15%.
• Minimum Salt Rejection is 99.58%.
• Specific boron stabilized rejection is based on 32,000 ppm NaCl, 5 ppm boron, 800 psi (5.5 MPa), 77°F (25°C), pH 8 and 8% recovery.

Mechanical / hydraulic

Element Dimensions

• A (Net Length when connected): 40.0 in (1,016 mm)

• B (Individual element length): 40.5 in (1,029 mm)

• C (Diameter): 7.9 in (201 mm)

• D (ID): 1.125 ID (29 ID)

• Element to fit nominal 8-inch (203-mm) I.D. pressure vessel.

Operating and Cleaning Limits

• Maximum Operating Pressure and Temperature:
  • 1,000 psig (69 bar) at T < 35°C
  • 900 psig (62 bar) at T = 35 – 45°C
• Maximum Element Pressure Drop: 15 psig (1.0 bar)
• pH Range, Continuous Operation: 2 – 11 (Maximum temperature for continuous operation above pH 10 is 95°F (35°C)).
• pH Range, Short-Term Cleaning (30 min.): 1 – 13
• Maximum Feed Silt Density Index (SDI): SDI 5
• Free Chlorine Tolerance: < 0.1 ppm

Additional Important Information

• Regulatory Note: These membranes may be subject to drinking water application restrictions in some countries; check application status before use and sale.
• Product Stewardship: Dow emphasizes assessing safety, health, and environmental information for its products.
• Customer Notice: Customers are encouraged to review manufacturing processes and applications. Permeate obtained from the first hour of operation should be discarded.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions present in the official PDF datasheet. For contractual data, always refer to the specific OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet