Calculating the pressure loss of the filter housing / filter element
MRFD1
en(us)
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MoWa MRFD1 4113517a en-us 2016-08-10.docx
2016-08-10
Calculating the pressure loss of the filter housing / filter element
The total pressure of the filters at a specific flow rate is comprised of the
housing
p
∆
and the filter element
p
∆
. The pressure loss of the housing can be
determined using the following pressure loss curve. The pressure loss of the
elements is calculated on the basis of the R factors.
Housing
p
∆
: Pressure loss curve, housing
D
iff
er
en
tial
p
re
ssu
re
(b
ar
)
Flow rate (l/min)
The upper housing curve holds for mineral oil with a density of 0.86 kg/dm³ and
a kinematics viscosity of 30 mm²/s. The lower housing curve holds for water at
20°C. For turbulent flow, the differential pressure will change proportionally to
the density; for laminar flow, it will change proportionally to the density and
viscosity. The flow velocity should not exceed 3 m/s at the filter inlet for oil and 4
m/s for water.
Filter element-
p
∆
: pressure loss calculation, filter element
The following calculation is based on clean filter elements:
1000
)
(
min)
/
(
)
/
²
(
)
(
×
×
×
×
=
∆
inch
L
n
l
Q
s
mm
V
R
bar
p
R
= R Factor
V = viscosity (mm²/s)
Q = flow rate (l/min)
N = Numbers of elements
L = element length (inch)
