Danfoss iSave 40, Руководство по эксплуатации, Страница: 18 / 101

Operation guide | iSave 40
18
180R9239 | AQ299555093252en-001601 | iSave 40 | 09.2022
5.17 Explanation of P&ID setup
• The pressure switch (3) must stop the
iSave (11) and the high-pressure pump
(4) at pressures lower than the minimum
inlet pressure or higher than the
allowable maximum pressure.
• The non-return valve (18) prevents the
high-pressure flow from the membrane
to flow back through the HP pump and
into the low pressure piping. This may
occur when the high-pressure pump
stops.
• The pressure relief valve (6) protects the
entire system against pressure overload
and relieves the water if the pressure
exceeds the maximum set pressure.
If the high pressure pump is a positive
displacement pump, the pump can build
up a very high pressure that will exceed
the mechanical strength of the mem-
brane housing, pipes and other
accessories.
• The valve (8) bleeds the air out of the
system. The valve must be placed at the
highest point in the system.
• The pressure relief valve (19) protects
the low pressure pipes against pressure
overload and relieves the water if the
pressure exceeds the maximum
allowable pressure.
• Inlet filters assure proper water quality.
High quality water extends the service
life of the whole system.
• It is important with selection of a
proper filter housing to ensure good
cartridge end sealing. If there is a high
risk of water by-pass it is recommended
to use a second stage filter solution.
• The pressure switch (13) must stop the
iSave when the pressure is lower than
the minimum inlet pressure or higher
than the maximum pressure.
See “Start and stop” procedure, “Membrane
cleaning” procedure and “iSave overload
protection” instructions in appendices 10.2, 10.3.
and 10.6.
5.16 Preferred system design and P&ID
*
second stage filter,
see box below
Media filter
M
Permeate
iSave
F
F
1
F
Flowmeter
VFD
M
HP in
HP out
VFD
Fresh water
permeate flush
Full flow
cleaning
6
17
8
9
16
15
13 14
10
11
12
19
Filter
3 micron
nominel
Filter
10 micron
absolut
Drain
2
4
18
5
LP in
20
F
*
*
Second stage filter: If recommended housing design and cartridges are not used, a second stage filter is required
PI PI
PI
PI
PI
PS
PS
7
3
PS
PI
CIP
27
28
Filter
5 micron
nominel