MRFD7
Calculating the pressure differential of the filter housing / filter element
Calculating the pressure differential of the filter housing / filter
element
The total pressure of the filters at a specific flow rate is comprised of the housing
and the filter element . The pressure loss of the housing can be determined using
the following pressure loss curve. The pressure loss of the filter elements is
computed on the basis of the R factors.
Housing
: Pressure loss curve, housing
p
Differential pressure (bar)
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-
: pressure loss calculation, filter element
p
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-Faktors
V = viscosity (mm²/s)
Q = flow rate (l/min)
N = Numbers of elements
L = Length of element (inch)
HYDAC FILTER SYSTEMS GMBH
en
Page 14 / 36
BeWa MRFD7 3551097 us 2010-05-18.doc
2010-05-18
