DHP 16 Axial Piston Pumps(High Pressure Pump For Industrial Reverse Osmosis)
The DHP 16 Axial Piston Pump is a High Pressure Pump For Industrial Reverse Osmosis developed by Wuxi Fenigal Science and Technology Co., Ltd. in collaboration with its OEM partner, Shenzhen CW Environment Technology. Specifically designed for conveying high-pressure, low-viscosity corrosive fluids in industrial reverse osmosis systems, it serves as a core power equipment for large-scale scenarios such as seawater desalination and industrial wastewater zero-liquid discharge.
As a key model in Fenigal’s DHP series, the DHP 16 inherits the technical genes of the series: "breakthrough in localization, high corrosion resistance, and low maintenance". Since Fenigal started the research and development of high-pressure plunger pumps in 1990, it has been committed to addressing the monopoly of foreign equipment. The launch of the DHP 16 further improves the product matrix of large-flow high-pressure plunger pumps. Based on the axial piston principle, the pump realizes high-pressure fluid conveyance through the reciprocating motion of plungers parallel to the drive shaft within plunger bores, which creates volume changes. Its core innovation lies in the adoption of "fluid self-lubrication technology"—using the conveyed liquid as the lubricating medium, it completely eliminates the lubricating oil tank of traditional plunger pumps, fundamentally preventing oil leakage from contaminating reverse osmosis media. This makes it particularly suitable for food and pharmaceutical membrane concentration processes with strict requirements on medium purity. Meanwhile, the DHP 16 is integrated with a flush check valve, which ensures one-way fluid flow when the pump is stopped, preventing medium backflow from damaging pump body seals and reverse osmosis membranes, thus guaranteeing system safety.
In terms of materials and performance, the key components of the DHP 16 are made of 2205 duplex stainless steel (SAF 2205 / EN 1.4462 / UNS 31803), providing excellent resistance to high salt and corrosion, and enabling long-term resistance to highly corrosive fluids such as seawater and desulfurization wastewater from coal-fired power plants. During operation, its pulsation amplitude is much smaller than that of centrifugal pumps, and the noise is controlled at ≤85 dB(A) through the optimized design of multiple plungers, making it suitable for workshop scenarios with high requirements for the operating environment. Its compact structure allows direct installation on motors or internal combustion engines without occupying additional large space, making it applicable to space-constrained scenarios such as coastal factories and island desalination stations.
In terms of application scenarios, as a High Pressure Pump For Industrial Reverse Osmosis, the DHP 16 is widely used in three core fields: (1) Large-scale seawater and brackish water desalination systems in coastal cities and islands, providing stable high-pressure power for municipal water supply;
(2) Industrial wastewater zero-liquid discharge treatment, such as desalination and salt concentration of chemical and printing and dyeing wastewater, realizing the recycling of water resources; (3) Membrane concentration of raw material liquids in the food and pharmaceutical industries, such as purification and concentration of dairy products and traditional Chinese medicine extracts, meeting high hygiene standards. Its technical level and product quality have reached the world’s advanced level, enabling stable adaptation to various medium and large-scale industrial reverse osmosis systems.
The technical parameters of the DHP 16 high-pressure plunger pump cover key indicators such as geometric displacement, flow rate, pressure, rotation speed, power, and temperature adaptability, which are the core basis for system selection and equipment matching. The specific parameters are shown in the table below:
| Technical Parameter Item | Value/Specification |
|---|
| Product Model | DHP 16 |
| Geometric Displacement | 188 cm³/rev |
| Flow Rate at Rated Speed (1500 rpm) | 15.8 m³/h |
| Minimum Outlet Pressure | 20 Bar (Contact the manufacturer for adjustment if needed) |
| Maximum Continuous Outlet Pressure | 80 Bar |
| Minimum Inlet Pressure | 2 Bar |
| Maximum Continuous Inlet Pressure | 5 Bar |
| Maximum Continuous Rotation Speed | 1500 rpm |
| Minimum Continuous Rotation Speed | 700 rpm |
| Noise Level (per EN ISO 3744-2010) | ≤85 dB(A) (Measured at maximum pressure and rotation speed of the entire pump unit) |
| Power at 1500 rpm and 80 Bar | 45 kW |
| Medium Temperature | 2～50℃ (Depends on NaCl concentration) |
| Ambient Temperature | 0～50℃ |
| Equipment Weight | 78 kg |
| Integrated Function | Flush Check Valve (Standard) |
As a fixed-displacement axial piston pump, the flow rate of the DHP 16 has a strictly proportional relationship with the input shaft rotation speed (the flow rate/rotation speed ratio is fixed). The flow rate required by the system can be flexibly matched by adjusting the motor rotation speed. If the actual flow rate required by the system is known, the corresponding motor rotation speed can be calculated using the following formula:
Selected Motor Rotation Speed (r/min) = (Required Flow Rate (m³/h) × Rated Rotation Speed (1500 r/min)) / Rated Flow Rate (15.8 m³/h)
The figure below shows the flow rate-rotation speed curve of the DHP 16 at 80 Bar pressure, which allows for an intuitive view of the actual flow rate corresponding to different rotation speeds (e.g., approximately 7.4 m³/h at 700 rpm and the rated 15.8 m³/h at 1500 rpm), providing a visual reference for system rotation speed matching and flow rate adjustment:
As a High Pressure Pump For Industrial Reverse Osmosis, the DHP 16 must be installed and operated in strict accordance with specifications to ensure stable system operation and extend the pump’s service life. The core points are as follows:
Filtration Requirements: Since reverse osmosis media (such as seawater and high-salt wastewater) may contain tiny particles, a depth filter with an accuracy of 10 μm (absolute accuracy) must be installed at the inlet of the DHP 16. It is required to have a filtration efficiency of 99.98% for particles larger than 10 μm (β10>5000). The precision clearance between the plunger and plunger sleeve inside the pump is extremely small (to control internal leakage and improve efficiency); if particles enter, they will cause rapid wear of components and even lead to pump body failure. The use of bag filters with only 90% efficiency is prohibited; spiral-wound filter elements are recommended.
Pressure Control: A low-pressure control switch (set to 1 Bar) must be installed at the inlet to automatically shut down the pump when the pressure is lower than 1 Bar, preventing cavitation from damaging the plunger. A high-pressure control switch (set to 70 Bar) must be installed between the outlet and the reverse osmosis membrane to shut down the pump when the pressure exceeds the limit. At the same time, a safety valve (refer to the specifications in Chapter 10 of the document) must be installed to avoid damage to the membrane element due to instantaneous pressure after the pump starts.
Pre-Startup Preparation: Before startup, thoroughly flush the pipelines and system to remove welding slag and debris; discharge the air from the pump and system through the pump body exhaust valve to prevent cavitation; confirm that the pump rotation direction is consistent with the arrow on the pump body. Starting the pump with the outlet valve closed is prohibited (as it may cause frequent operation of the safety valve or pipeline burst).
The figure below shows the standard connection method between the DHP series high-pressure pump and the motor. When installing the DHP 16, ensure that the coupling clearance is at least 3-5 mm and that there is no axial/radial load on the pump shaft to avoid bearing wear or seal leakage caused by misalignment:
The power consumption of the DHP 16 changes with the operating pressure. The power values at different typical pressures are shown in the table below, which can be directly used for system motor selection (e.g., matching a 45 kW motor can meet the rated operation requirements at 80 Bar and avoid motor overload):
| Pump Model | Rated Flow Rate (L/min) | Rated Flow Rate (m³/h) | Power at 60 Bar | Power at 70 Bar | Power at 80 Bar | Rated Rotation Speed (rpm) |
|---|
| DHP 16 | 263 | 15.8 | 37 kW | 45 kW | 45 kW | 1500 |
The outline dimensions of the DHP 16 (especially the inlet and outlet interface dimensions) and the installation dimensions of the complete equipment (including the frequency conversion motor) are the key basis for pipeline connection, on-site layout, and foundation design. The details are as follows:
Interface Dimensions: Both the inlet and outlet of the DHP 16 feature M52×1.5 threads with a depth of 21 mm. High-pressure pipe fittings of the corresponding specifications (refer to the "High-Pressure Hose Connector" specifications in Chapter 11 of the document) must be matched to ensure the sealing performance of the interface and prevent high-pressure fluid leakage.
Complete Equipment Dimensions: When the DHP 16 is equipped with an independent fan motor (frequency conversion motor), the installation dimensions corresponding to motors of different powers are shown in the table below (Unit: mm), which can be used for on-site space planning and equipment fixing design:
| Pump Model | A | B | H | K | P | AD | HD | C | D | L | G | IEC Motor |
|---|
| DHP 16 | 318 | 305 | 200 | 19 | 400 | 305 | 505 | 342 | 234 | 760 | 1336 | 37 kW -4P |
| DHP 16 | 356 | 286 | 225 | 19 | 450 | 325 | 550 | 342 | 234 | 785 | 1136 | 45 kW -4P |
| DHP 16 | 356 | 311 | 225 | 19 | 450 | 325 | 550 | 342 | 275 | 865 | 1482 | 55 kW -4P |
| DHP 16 | 406 | 349 | 250 | 24 | 550 | 380 | 630 | 342 | 275 | 945 | 1521 | 75 kW -4P |
The figure below is the outline structure diagram of the DHP 16, marking the positions of key components such as the inlet, outlet, installation interface, exhaust hole, and temperature sensor interface, which facilitates on-site installation positioning and pipeline connection:
Although the DHP 16 adopts a self-lubricating design (no lubricating oil required), proper maintenance can significantly extend its service life (designed for over 8000 hours of operation). The core maintenance points are as follows:
Daily Maintenance: During operation, real-time monitoring of noise and vibration is required. If abnormalities occur (such as a sudden increase in noise or intensified vibration), the pump must be shut down immediately for inspection to check for plunger wear, seal aging, or insufficient inlet pressure. In high-salt environments (such as seawater desalination), the pump cavity must be flushed with fresh water after each shutdown to discharge concentrated brine and prevent salt crystallization from damaging the plunger and seals—during flushing, the pump can be started briefly to ensure complete discharge of residual brine in the pump cavity.
Shutdown Maintenance: For short-term shutdowns (≤3 days), no flushing is required; the pump only needs to be kept filled with the medium. For medium-term shutdowns (3～15 days), thorough flushing with fresh water is necessary. For long-term shutdowns (>15 days), flushing with fresh water containing a bactericide is required to prevent microbial growth from causing component corrosion. After flushing, the pump inlet and outlet must be sealed to prevent impurities from entering.
Regular Inspection: A comprehensive disassembly and inspection is recommended after 8000 hours of operation. Worn parts (such as seal plates, plunger sleeves, and springs) should be replaced, and the tightness of the check valve should be checked to ensure no internal leakage. The wear of the inlet and outlet interface threads should also be inspected, and the sealing gasket should be replaced in a timely manner to avoid high-pressure leakage.
Fenigal provides comprehensive warranty and maintenance services for the DHP 16, covering the full-life-cycle usage needs of the equipment. The specific details are shown in the table below:
| Service Type | Service Content | Remarks |
|---|
| Free Warranty | 1-year free maintenance from the date of ex-factory (excluding damage caused by human error or improper use); 8000-hour maintenance-free warranty (not exceeding 18 months from the production date) | It is required to meet the conditions of "specified filtration accuracy (10 μm), pressure (≤80 Bar), and rotation speed (≤1500 rpm)" |
| Fault Handling | Axial piston pump fault detection, on-site maintenance (such as seal replacement and pressure switch debugging), and factory repair (such as plunger repair and pump cavity cleaning) | A response will be provided within 24 hours after receiving a fault report, prioritizing the resolution of shutdown issues in industrial reverse osmosis systems to reduce production losses |
| Spare Parts and Customization Services | Provision of original spare parts (such as M52 interface check valves, 2205 stainless steel plungers, and seal plates); customization of corrosion-resistant components according to customers' special medium requirements | Spare parts are made of the same materials as the original to ensure full compatibility with the DHP 16, and no re-commissioning is required after replacement |
| Maintenance for Similar Pumps | Provision of maintenance services for axial piston high-pressure pumps of other domestic and international brands | Covering common high-pressure pump models in the industrial reverse osmosis field, reducing the maintenance cost and management difficulty of customers' multi-brand equipment |
For maintenance or warranty inquiries, please contact Wuxi Fenigal Science and Technology: