180R9264 | AQ115586503043en-000903 | 21
© Danfoss | 2023.03
Operating guide
Installation, Operation and Maintenance APP 11-13
2. Benefits
1. Introduction
• Zero risk of lubricant contamination:
- Oil lubricants are replaced with the
pumped medium, water, so there is no
contamination risk from the pump.
•
Low maintenance costs:
- Efficient design and all-stainless steel
construction ensure exceptionally long
life. When Danfoss specifications are
met, service intervals of 8,000 hours can
be expected. Service is easy, and can be
carried out on-site due to the simple
design and few parts.
•
Low energy costs:
- The highly efficient axial piston design
provides the lowest energy
consumption of any comparable pump
on the market.
•
Easy installation:
- The most compact and lightest design
available.
- The pump can be installed vertically
and horizontally.
- No pulsation dampeners necessary due
to extremely low pressure pulsation.
- Powered directly by electric motors or
combustion engines (with special
coupling).
- All pumps except APP (W) 5.1 - 10.2 are
supplied with an integrated flushing
valve that allows the fluid to flow
from inlet to the outlet, when the pump
is not running.
•
High reliability:
- All parts are made of high corrosion
resistant materials e.g. Duplex
(EN1.4462/ UNS S31803) and
Super Duplex (EN1.4410/UNS S32750)
stainless steel and carbon reinforced
PEEK.
•
Certified quality:
- Pumps available as ATEX certified.
- For other certifications, please see data
sheets for APP S (all super duplex) and
APP S 674 (API).
- Positive Material Identification (PMI)
report available on request.
- IATF 16949, ISO 9001, ISO 14001.
3.
Application examples
Danfoss APP pumps are built into a broad range
of RO desalination plants around the world:
•
Containerized solutions for hotels, resorts
and residences on islands and in coastal
regions
•
Mobile systems for humanitarian and
military organizations
•
Onboard systems for ships and yachts
•
Offshore platforms for the oil and gas
industry
•
Municipal and regional waterworks
This data sheet is valid for APP pumps both non
ATEX and ATEX certified. ATEX certified pumps
are indicated by Ex in the type designation -
example APP 0.6 Ex.
The Danfoss range of APP high-pressure pumps
is designed according to EN 809 for use in RO
applications with low viscosity and corrosive
fluids such as:
•
Sea water
•
Brackish water
•
Waste water (APP W)
Danfoss APP pumps are positive displacement
pumps with axial pistons that move a fixed
amount of water in each cycle. Flow is propor-
tional to the number of input shaft revolutions
(rpm). Unlike centrifugal pumps, they produce
the same flow at a given speed no matter what
the discharge pressure.
Below sectional drawing is an example of an
APP pump. The sectional drawing for the specific
pump sizes are to be found in the pump
instruction.
1:
Shaft sealing
2:
Port flange
3:
Bleeding plug
4:
Retainer plate
5:
Piston/shoe
6:
Valve plate
7:
Swash plate
8:
Cylinder barrel
9:
Springs
10:
Port plate
11:
Flushing valve
(not available on
APP 5.1-10.2)
12: Housing
13:
Tail stock screws
14:
Drain plug
Data sheet
