Datasheet summary
Dairy DK2540C30
Engineering summary from PDF text extraction for Dairy DK2540C30. Verify every value with the OEM datasheet.
Summary
Product identification
The Dairy DK Series consists of D-Series family proprietary thin-film nanofiltration membrane elements, characterized by an approximate molecular weight cut-off of 150-300 Dalton for uncharged organic molecules. Divalent and multivalent anions are preferentially rejected, while monovalent ion rejection depends on feed concentration and composition.
The DK membrane has a minimum rejection of 98% on 2,000 ppm MgSO₄ at 25°C (77°F) and 110psi operating pressure.
These elements are typically used in food-related processes requiring stringent sanitary procedures, including lactose desalting, deacidification, and demineralization of whey or UF permeate. They feature a Durasan* Cage patented outer wrap, a selection of feed spacers, and polysulfone parts.
The Dairy DK elements comply with:
- FDA Regulations relevant sections of 21CFR
- EU Framework 1935/2004/EC
- Halal and Kosher certifications
Membrane type: D-Series, Thin Film Membrane (TFM*)
| Model | Spacer mil (mm) | Active Area ft² (m²) | Part Number |
|---|---|---|---|
| Dairy DK3838C30 | 30 (0.76) | 75 (7.0) | 1227618 |
| Dairy DK3838C50 | 50 (1.27) | 60 (5.6) | 3161358 |
| Dairy DK3840C30 | 30 (0.76) | 77 (7.2) | 1206940 |
| Dairy DK3840C50 | 50 (1.27) | 58 (5.4) | 1206942 |
| Dairy DK8038C30 | 30 (0.76) | 372 (34.6) | 1226591 |
| Dairy DK8038C50 | 50 (1.27) | 282 (26.2) | 1206977 |
| Dairy DK8038C65 | 65 (1.65) | 220 (20.4) | 1269441 |
| Dairy DK8040C30 | 30 (0.76) | 374 (34.7) | 1229937 |
Operating limits
- Typical Operating Pressure: 70-400psi (483-2,757kPa)
- Typical Operating Flux: 5-20 GFD (8–34 LMH)
- Maximum Operating Pressure: 600psi (4,137kPa)
- Maximum Permeate Pressure: 60 psi (413 kPa) (Permeate pressure should never exceed concentrate pressure.)
- Maximum Temperature: 122°F (50°C)
- pH Range: 3.0-9.0
- Recommended Pressure Drop over an element: 12psi (83kPa)
- Maximum Pressure Drop over an element: 15psi (103kPa)
- Maximum Pressure Drop per housing: 60psi (414kPa)
- Chlorine Tolerance: 500ppm-hours (dechlorination recommended)
Product water
- Clean Water Flux (CWF): 14 GFD (24 LMH) @ 110psi. CWF is the rate of water permeability through the membrane after cleaning (CIP) at reproducible temperature and pressure. CWF can vary ±25%.
Mechanical / Hydraulic
Element dimensions are referenced by figures (Figure 1 for 8040, Figure 2 for all others) which are not included in this extract.
| Model | A inches (cm) | B inches (cm) | C inches (cm) | Boxed Weight lbs (kg) |
|---|---|---|---|---|
| Dairy DK3838C | 38.00 (96.5) | 0.833 (2.12) | 3.79 (9.6) | 9 (5) |
| Dairy DK3840C | 38.75 (98.4) | 0.833 (2.12) | 3.79 (9.6) | 9 (5) |
| Dairy DK8038C | 38.00 (96.5) | 1.125 (2.86) | 7.91 (20.1) | 35 (16) |
| Dairy DK8040C | 40.00 (101.6) | 1.125 (2.86) | 7.91 (20.1) | 35 (16) |
Cleaning Parameters
Limits for Nanofiltration Membranes during Clean-In-Place (CIP):
| Temperature | pH Minimum | pH Maximum |
|---|---|---|
| 50°C (122°F) | 2.0 | 11.0 |
| 50°C (122°F) | 2.0 | 10.5 |
| 45°C (113°F) | 2.0 | 11.0 |
| 35°C (95°F) | 1.5 | 11.5 |
| 25°C (77°F) | 1.0 | 11.5 |
Note: CIP at pH 11 and 50°C is acceptable for heavily fouled systems. For optimum membrane element lifetime, pH 10.5 at 50°C (122°F) is recommended for daily CIP protocol.
Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the original PDF. 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.