Danfoss APP S 674 Series, Инструкция по установке, эксплуатации и обслуживанию, Страница: 30 / 72

30
180R9270 / IOM APP S 674 - v01 / 03.2013
Data sheet APP S 674 pumps
12
521B1187 / DKCFN.PD.014.H2.02 / 03.2013
The figure below illustrates how to mount and
connect all pump sizes to an electric motor or
combustion engine. If alternative mounting is
required, please contact Danfoss High Pressure
Pumps for further information.
8. Installation
A C B D
E
A: Pump
B: Bell housing
C: Flexible coupling
D: Motor
E: Inlet/Outlet flange
8.1 Filtration
Proper filtration is crucial for the performance,
maintenance and warranty of your pump.
Protect your pump, the application in which it is
installed by always ensuring that all filtration
specifications are met, and by always changing
filter cartridges according to schedule.
Since water has very low viscosity, Danfoss
APP S 674 pumps have been designed with very
narrow clearances in order to control internal
leakage rates and improve pump performance.
To minimize wear on the pump, it is therefore
essential to filter inlet water properly:
The main filter must have a filtration efficiency
of 99.98% at 10 μm. We strongly recommend
that you always use precision depth filter
cartridges rated 10μm abs. β
10
≥ 5000.
Please note that we do not recommend bag
filters or string-wound filter cartridges , which
typically have only 50% filtration efficiency. This
means that out of 100,000 particles that enter
such filters, 50,000 particles pass right through
them; compare this to precision depth filters that
are 99.98% efficient, and only allow 20 of the
same 100,000 particles to pass through.
For more information on the importance of
proper filtration, including explanation of
filtration principles, definitions, and guidance on
how to select the right filter for your pump,
please consult our Filtration information and
specifications (Danfoss document number
521B1009).
8.2 Noise
Since the pump unit is mounted on a frame, the
overall noise level can only be determined for a
complete system. To minimize vibrations and
noise throughout the system, it is therefore
recommended to mount the pump unit correctly
on a frame with dampeners and to use flexible
hoses rather than metal pipes where possible.
The noise level is influenced by:
• Pump speed:
High rpm makes more fluid/structure-
borne pulsations/vibrations than low rpm
due to higher frequency.
• Discharge pressure:
High pressure makes more noise than low
pressure.
• Pump mounting:
Rigid mounting makes more noise than
flexible mounting due to structure-borne
vibrations.
• Connections to pump:
Pipes connected directly to the pump make
more noise than flexible hoses due to
structure-borne vibrations.
• Variable frequency drives (VFD):
Motors regulated by VFDs can increase
noise level if the VFD does not have the
right settings.
The curves on the following page indicate the
sound pressure level in dB(A) measured in a
reverberation room at a distance of 1 metre from
the motor/pump unit surface. The measurements
is according to EN ISO 3744: 2010 and the dB(A)
[L
PA
, 1m] values is calculated.