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APP high-pressure pump
The APP high-pressure pump is a range of oil-free axial piston pumps by Danfoss (Europe), purpose-built for seawater reverse osmosis (SWRO) systems onshore, offshore, and on marine vessels. Manufactured using highly durable duplex/super duplex stainless steel, these pumps deliver excellent corrosion resistance, long service life, and stable performance in harsh environments.
PRODUCT FEATURES
- Zero risk of lubricant contamination: The axial piston pump is completely oil-free and uses the pumped medium—water—as the lubricant, ensuring there is no risk of oil contamination.
- Easy maintenance: A simple design with few moving parts, all-stainless steel construction, and service intervals of up to 8,000 hours minimize maintenance efforts and downtime.
- Energy efficiency: The highly efficient axial piston design reduces power consumption, optimizing operating costs.
- Compact footprint: Small, space-saving footprint allows flexible integration into various system layouts.
- Durability: Built from corrosion-resistant materials including Duplex (EN1.4462/UNS S31803), Super Duplex (EN1.4410/UNS S32750), carbon-reinforced PEEK, and ceramics for long-term reliability in aggressive environments.
- Certified quality: Fully certified to ISO 9001, ISO 14001, IATF 16949, and ATEX standards. Positive Material Identification (PMI) report available upon request.
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SPECIFICATIONS
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Geometric displacement
4.07 – 888 cm3/rev (0.25 – 54.2 in3/rev)
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Max. outlet pressure
70 – 83 bar (1,015 – 1,200 psig)
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Min. outlet pressure
20 – 30 bar (290 – 435 psig)
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Inlet pressure continuous
0.5 – 5 barg (7.3 – 72.5 psig)
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Max. inlet pressure peak
10 bar (145 psig)
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Min. inlet operating pressure
2 – 3.5 bar (29 – 50 psig)
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Min. speed continuous
700 rpm
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Max. speed continuous
1,200 – 3,450 rpm
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Flow at 1,000 rpm
(max pressure)0.22 – 52 m3/h (0.97 – 228.9 gpm)
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Flow at 1,500 rpm
(max pressure)0,34 – 78 m3/h (1,49 – 343,4 gpm)
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Flow at 1.200 rpm
(max pressure)1,18 – 62 m3/h (5,2 – 272,9 gpm)
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Flow at 1,800 rpm
(max pressure)1,78 – 2,84 m3/h (7,8 – 12,5 gpm)
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Media temperature
2 – 50°C (36 – 122°F)
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Ambient temperature
0 – 50°C (32 – 122°F)
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Weight (dry)
5.2 – 196 kg (11.5 – 432 lb)
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Sound pressure level, LPA 1m
74 – 96 dB(A)
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Footprint with IEC motor
0.1 – 1.5 m2 (1.08 – 16.1 foot2)
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Max. speed at max. pressure
2.2 – 200 kW
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3,000 rpm at max. pressure
3 – 5 HP
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Torque at max. outlet pressure
5.8 – 617 Nm (4.2 – 455 lbf-ft)
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Modern RO systems for seawater and brackish water treatment demand high performance, reduced operational costs, and easy maintenance in challenging conditions. Danfoss developed the APP high-pressure pump line to meet these expectations.
1. Structure and working principle of the APP pump
To gain better insight into the operating mechanism of Danfoss’s APP high-pressure axial piston pumps, we recommend watching the following video. It provides a visual explanation of how the pump delivers stable high pressure and transfers energy from the motor to the pumping unit.
2. Technical specifications of APP pump models
The APP series includes a wide range of models to meet varying flow and pressure requirements. Below are the specifications for representative models:
APP 0.6 – 46:
| SPECIFICATION | VALUE | |
|---|---|---|
| Geometric displacement | 4.07 – 444 cm3/rev |
|
| Pressure | Max. outlet pressure continuous | 70 – 83 bar |
| Min. outlet pressure | 10 – 20 bar |
|
| Inlet pressure continuous | 0.5 – 5 barg |
|
| Max. inlet pressure peak | 5 – 10 bar |
|
| Speed continuous | Minimum | 700 rpm |
| Maximum | 1,200 – 3,450 rpm | |
| Flow (max. pressure) | At 1,000 rpm | 0.22 – 26.29 m3/h |
| At 1,500 rpm | 0.34 – 39.44 m3/h |
|
| At 1,200 rpm | 0.27 – 31.55 m3/h |
|
| At 1,800 rpm | 0.4 – 10.5 m3/h |
|
| Temperature | Media | 2 – 50°C |
| Ambient | 0 – 50°C |
|
| Weight (dry) | 5.2 – 105 kg |
|
| Sound pressure level, LPA 1m | 74 – 85.3 dB(A) | |
| Footprint with IEC motor | 0.1 – 1.1 m2 |
|
| Motor (at max. pressure) | Max. speed | 2.2 – 110 kW |
| 3,000 rpm | 3 – 15 HP | |
| Torque at max. outlet pressure | 5.8 – 617 Nm |
|
APP 53 – 92:
| SPECIFICATION | VALUE | |
|---|---|---|
| Geometric displacement | 617 – 888 cm3/rev |
|
| Pressure | Max. outlet pressure | 70 – 83 bar |
| Min. inlet operating pressure | 2 – 3.5 bar |
|
| Max. inlet operating pressure | 5 bar |
|
| Max. inlet pressure peak | 10 barg |
|
| Min. outlet pressure | 30 bar |
|
| Speed | Min. speed continuous | 700 rpm |
| Max. speed continuous | 1,500 – 1,780 rpm | |
| Flow (at max. pressure) | Min. fow | 24 – 36 m3/h |
| At 700 rpm | 24 – 36 m3/h |
|
| At 1,000 rpm | 35 – 52 m3/h |
|
| At 1,200 rpm | 42 – 62 m3/h |
|
| At 1,500 rpm | 53 – 78 m3/h |
|
| At 1,700 rpm | 88 m3/h |
|
| At 1,780 rpm | 92 m3/h |
|
| Efficiency | 1,000 rpm | 88 – 89% |
| 1,200 rpm | 89 – 90% | |
| 1,500 rpm | 88 – 89% | |
| 1,700 rpm | 88% | |
| 1,780 rpm | 87% | |
| Temperature | Media | 2 – 50°C |
| Ambient | 0 – 50°C |
|
| Weight | Dry | 196 kg |
| Operation | 204 kg |
|
| Sound pressure level | 84 – 96 dB(A) | |
| Footprint with IE3 motor | 1.49 – 1.50 m2 |
|
| Max.speed at max. pressure | 132 – 200 kW |
|
For detailed datasheets of each model, please refer to the Technical Documents section.
3. Key advantages of the APP high-pressure pump
The APP high-pressure pump offers a range of outstanding features that enhance operational efficiency and reduce overall costs:
- Oil-free lubrication: Utilizes water as the lubricating medium, eliminating the risk of oil contamination in the process stream.
- Low maintenance costs: Simple design with few moving parts and full stainless-steel construction extend service life. Maintenance is easy and can be performed on-site, with service intervals reaching up to 8,000 hours.
- High energy efficiency: The axial piston design minimizes power consumption, resulting in significant operating cost savings.
- Compact and easy installation: Among the most compact and lightweight pumps on the market. It supports both horizontal and vertical mounting orientations. Thanks to extremely low pressure pulsation, no pulsation dampeners are needed. Compatible with electric motors or combustion engines using suitable couplings.
- High reliability: All wetted components are made from corrosion-resistant materials such as Duplex/Super Duplex stainless steel and Polyether Ether Ketone (PEEK), ensuring durability in harsh environments.
- Certified quality: Complies with international standards including ISO 9001, ISO 14001, IATF 16949, and ATEX. Positive Material Identification (PMI) reports are available upon request to verify material origin and compliance.
4. Certifications of the APP high-pressure pump
In addition to its optimized design, the APP pump affirms its quality through a comprehensive range of international certifications. These are critical to ensuring safety, durability, and compliance with RO system requirements:
- ISO 9001: Quality Management System certification ensuring strict manufacturing procedures.
- ISO 14001: Environmental Management System certification demonstrating commitment to minimizing environmental impact during production.
- IATF 16949: Automotive Quality Management System certification, emphasizing robust manufacturing and quality control processes.
- ATEX: Certification for safe operation in potentially explosive atmospheres—essential for specialized industrial environments.
- PMI (Positive Material Identification): Material verification reports available upon request to ensure compliance with technical specifications.
5. Applications of the APP high-pressure pump
Thanks to its flexible design and outstanding performance, the Danfoss APP pump is widely applied in various sectors:
- Containerized RO systems for hotels, resorts, and residential properties on islands or in coastal regions.
- Mobile water treatment systems used by humanitarian or military organizations.
- RO systems installed on ships and luxury yachts.
- Offshore oil and gas platforms requiring robust water treatment solutions.
- Municipal and regional water treatment plants.
6. ATS Water Technology – Authorized distributor of APP high-pressure pumps
ATS Water Technology Co., Ltd. is proud to be the official distributor of Danfoss APP pumps in Vietnam. We offer the full range of models from APP 0.6 to APP 92, including the highly corrosion-resistant APP Ceramic series to meet diverse customer demands.
When purchasing from ATS Water Technology, customers are guaranteed 100% genuine products with full documentation including Certificate of Origin (CO), Certificate of Quality (CQ), technical manuals, and international certifications such as ATEX, ISO, IATF 16949, and PMI.
We also provide expert consultation services in system design, technology selection, and technical support to help you choose the most suitable model for your specific RO system requirements.
With many years of experience in water treatment and a team of highly trained engineers, ATS Water Technology is your reliable partner for any project utilizing Danfoss APP high-pressure pumps in Vietnam. Contact us today for fast and professional assistance!
ATS WATER TECHNOLOGY CO., LTD
- Head office: 54/18 Bui Quang La, An Hoi Tay Ward, HCMC, Vietnam
- Branch office: 77 DHT10B, Dong Hung Thuan Ward, HCMC, Vietnam
- Consultation and support: (028) 6258 5368 – (028) 6291 9568
- Email: info@atswatertechnology.com
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- Quick contact: Zalo Official | Telegram | WhatsApp
TECHNICAL DOCUMENTS
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