Datasheet summary
NF NF7
Engineering summary from PDF text extraction for NF NF7. Verify every value with the OEM datasheet.
Summary
Product identification
The MICRODYN NF7 series consists of Nanofiltration (NF) elements designed for water purification. These elements feature selective rejection, allowing monovalent ions to pass while rejecting divalent and polyvalent ions. They are available in standard 4-inch and 8-inch spiral-wound designs.
Membrane Characteristics
- Membrane Chemistry: Thin-Film Composite Polyamide
- Construction: Spiral-Wound Membrane Element with Fiberglass Outerwrap (Tape outerwrap also available)
- Stabilized MgSO₄ Rejection: > 97%
- Stabilized NaCl Rejection: 45 – 55%
- All models on this sheet have diamond shaped feed spacers.
Element Specifications
| Model | Permeate Flow - m³/day (GPD) | Membrane Area - m² (ft²) |
|---|---|---|
| 4040-NF7 | 9.5 (2,500) | 7.9 (85) |
| 8040-NF7-400 | 47.3 (12,500) | 37.2 (400) |
Test conditions for permeate flow: 2,000 ppm MgSO₄, 4.8 bar (70 psi), 25°C (77°F), 15% recovery, pH 8.0, 30 minutes operation. Flow rates will be no more than 15% below the values shown.
Physical Dimensions
| Model | Dim. A – mm (inches) | Dim. B – mm (inches) | Dim. C – mm (inches) | Permeate Tube | Outerwrap Type | Element Weight – kg (lb) |
|---|---|---|---|---|---|---|
| 4040-NF7 | 1,016 (40.0) | 99 (3.9) | 19.1 (0.75) | Male | Tape | 4 (9) |
| 8040-NF7-400 | 1,016 (40.0) | 201 (7.9) | 28.6 (1.125) | Female | Fiberglass | 17 (37) |
- Diameters for Dimension “C” are as follows: For Female elements, “C” is the Inner Diameter. For Male elements, “C” is the Outer Diameter.
- Male elements have a protruding permeate tube. Dimension “D” (not shown in table but referenced as in diagram) is 1.05 in (26.7 mm).
- Shipping weight is dependent on packaging material and quantity shipped.
Operating limits
- Maximum Operating Pressure:
- Tape Outerwrap Models: 21 bar (300 psi)
- Fiberglass Outerwrap Models: 41 bar (600 psi)
- Maximum Operating Temperature: 45°C (113°F)
- Cleaning pH Range: 1.0 – 12.0
- Chlorine Tolerance: < 0.1 ppm (Pretreatment is recommended for free chlorine removal to prevent damage to membranes.)
- Maximum Pressure Drop: 1 bar (15 psi) per element; 4 bar (60 psi) per housing
- Maximum SDI₁₅: 5.0
- Maximum Turbidity: 1 NTU
Important Information
- Start-up: MANN+HUMMEL Water & Fluid Solutions recommends flushing elements for 30 minutes at low pressure and discarding permeate during the flush prior to operation.
- Cleaning: Elements must be cleaned periodically to ensure proper operation and to prevent membrane damage.
- Storage: Elements must be stored appropriately to ensure proper operation and to prevent membrane damage.
Customizable Specialty Elements
MANN+HUMMEL Water & Fluid Solutions offers a full range of membranes and element designs for challenging water and process applications, including low-fouling RO, submerged UF, continuous high temperature, ultra-high pressure, and unique sanitary designs.
Disclaimer: This summary is generated from an 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)
Curated from selected public technical reference material for discovery and preliminary comparison. This summary is not a substitute for a current certified manufacturer datasheet. Verify revisions and design limits before use.