The Danfoss APP 78/1500 (code 180B7808) is an axial piston high-pressure pump for large seawater reverse osmosis trains. It is oil-free and water-lubricated — the pumped water itself lubricates the bearings, so there is no oil circuit to maintain and no path for oil to reach the process. All wetted parts are Duplex and Super Duplex stainless steel.
Documentation & Drawings
Technical Specifications
| Identification | |
| Code number | 180B7808 |
| Pump size | APP 78/1500 |
| Series | APP 53 – 92 |
| Type | Axial piston, oil-free, water-lubricated |
| Displacement & Flow | |
| Geometric displacement | 888 cm³/rev (54.2 in³/rev) |
| Minimum flow | 36 m³/h (158 gpm) |
| Flow at 700 rpm, max. pressure | 36 m³/h (158 gpm) |
| Flow at 1000 rpm, max. pressure | 52 m³/h (228 gpm) |
| Flow at 1200 rpm, max. pressure | 62 m³/h (275 gpm) |
| Flow at 1500 rpm, max. pressure | 78 m³/h (345 gpm) |
| Efficiency | |
| Typical efficiency at 1000 rpm, max. pressure | 89% |
| Typical efficiency at 1200 rpm, max. pressure | 90% |
| Typical efficiency at 1500 rpm, max. pressure | 89% |
| Pressure | |
| Max. outlet pressure (MAWP) | 83 barg (1,200 psig) |
| Min. outlet pressure | 30 barg (435 psig) |
| Min. inlet operating pressure | 2 barg (29 psig) |
| Max. inlet operating pressure | 5 barg (73 psig) |
| Max. inlet pressure, peak | 10 barg (145 psig) |
| Speed | |
| Min. speed, continuous | 700 rpm |
| Max. speed, continuous | 1,500 rpm |
| Operating Conditions | |
| Media temperature | 2–50 °C (36–122 °F) |
| Ambient temperature | 0–50 °C (32–122 °F) |
| Sound pressure level at 1 m | 84–93 dB(A) |
| Mechanical | |
| Weight (dry) | 196 kg (432 lb) |
| Weight (in operation with water) | 204 kg (450 lb) |
| Footprint with IEC motor | 1.50 m² (16.1 foot²) |
| Body material | Duplex / Super Duplex stainless steel |
| Typical Motor | |
| Motor size at max. speed, max. pressure | 160 kW (250 HP) |
| Identification | |
| Manufacturer | Danfoss High Pressure Pumps |
| Data sheet reference | Danfoss AI167386503010en-001302, §4.1 |
Videos
How an axial piston pump works — APP pump working animation
Why are axial piston pumps ideal for SWRO?
Videos courtesy of Danfoss High Pressure Pumps.
Case Studies
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Why an Axial Piston Pump
Flow from a positive-displacement axial piston pump is set by displacement and shaft speed rather than by system pressure, so output stays stable as membranes foul and feed pressure rises. A centrifugal pump's output falls away as head increases; this one does not.
- Oil-free — lubricated by the pumped water, so no oil changes and no contamination path to the permeate.
- No high-pressure mechanical seal — a common wear point on other pump types is simply absent.
- Duplex / Super Duplex throughout the wetted path for chloride resistance.
- Field serviceable — Danfoss supplies purpose-designed tool kits and service parts, which we stock.
Danfoss publishes measured efficiency for this range: 89% at 1000 rpm, 90% at 1200 rpm, 89% at 1500 rpm, at maximum pressure after the system has been commissioned and run in.
Frequently Asked Questions
What flow will the APP 78/1500 give me?
Does it come with a motor?
What inlet pressure does it need?
What filtration does it need?
How is it shipped?
Specifications reproduced from Danfoss data sheet AI167386503010en-001302, §4.1. APP® is a registered trademark of Danfoss A/S. Danfoss reserves the right to alter specifications without notice; confirm critical values against the current data sheet before purchase.
