Danfoss APP 46 Installation, Operation And Maintenance Manual page 21

Operating guide
1. Introduction
2. Bene ts
3. Application examples
© Danfoss | 2023.03
Installation, Operation and Maintenance APP 21-46 pumps
This data sheet is valid for APP pumps both non
ATEX and ATEX certi ed. ATEX certi ed 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
uids such as:
• Sea water
• Brackish water
• Waste water (APP W)
1: Shaft sealing
2: Port ange
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
• 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:
- E cient design and all-stainless steel
construction ensure exceptionally long
life. When Danfoss speci cations 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 e cient 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.
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
Danfoss APP pumps are positive displacement
pumps with axial pistons that move a xed
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 ow 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 speci c
pump sizes are to be found in the pump
instruction.
- 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 ushing
valve that allows the uid to ow
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.
• Certi ed quality:
- Pumps available as ATEX certi ed.
- For other certi cations, please see data
sheets for APP S (all super duplex) and
APP S 674 (API).
- Positive Material Identi cation (PMI)
report available on request.
- IATF 16949, ISO 9001, ISO 14001.
• Mobile systems for humanitarian and
military organizations
• Onboard systems for ships and yachts
• O shore platforms for the oil and gas
industry
• Municipal and regional waterworks
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