Brochure

Separation efficiency
The capacity for separating the impurities in
the medium circulating in the closed circuits
of the systems basically depends on three
parameters:
1) It increases as the size and mass of the
particle increase. The larger and heavier
particles drop before the lighter ones.
2) It increases as the speed decreases. If the
speed decreases, there is a calm zone
inside the dirt separator and the particles
separate more easily.
3)
It increases as the number of recirculations
increases.
The medium in the circuit, flowing through
the dirt separator a number of times
during operation, is subjected to a
progressive action of separation, until
the impurities are completely removed.
The special design of the internal element in
the Caleffi DIRTCAL dirt separator, is able to
completely separate the impurities in the
circuit down to a minimum particle size
of 5 µm (0.2 mil).
The adjacent graph illustrates how DIRTCAL
quickly separates nearly all the impurities.
After only 50 recirculations, approximately
one day of operation, up to 100% is
effectively removed from the circuit for
particles of diameter greater than 100 µm
(3.9 mil) and on average up to 80% taking
account of the smallest particles. The
continual passing of the medium during
normal operation of the system gradually
leads to complete dirt removal.
Reduced head losses
A normal Y strainer performs its function via
a metal mesh selected for the size of the
largest particle. The medium therefore has a
consequent initial loss of head that increases
as the degree of clogging increases.
Whereas, the dirt separator carries out its
action by the particles striking the internal
element and subsequently dropping into the
collection chamber. The consequent head
losses are greatly reduced and are not
affected by the amount of impurities
collected.
(kPa)
1" 1 1/4" 1 1/2" 2” 2 1/2” 3” 4” 3/4" 5” 6” 2”
0. 1
0. 05
0.09
0.08
0.07
0.06
0.035
0.04
0.045
0.12
0.14
0.16
0.18
0.25
0.3
0.35
0. 2
1
0
.1 0
0.2 0
0.5
0.9
0.8
0.7
0.6
0.12
0.14
0.16
0.18
0.25
0.3
0.35
0.4
0.45
1.2
1.4
1.6
1.8
2.5
3
2 . 0
1
0. 5
0.9
0.8
0.7
0.6
0.45
0.4
0.09
0.08
0.07
0.06
0.025
0.03
0. 0 2
( ft of water )∆P ( ft of water )
100
2
10
5
20 50
1000
200 500
0. 1
0. 05
0.09
0.08
0.07
0.06
0.035
0.04
0.045
0.12
0.14
0.16
0.18
0.25
0.3
0.35
0. 2
1
0. 5
0.9
0.8
0.7
0.6
0.45
0.4
0.025
0.03
0. 0 2
6 7 8 9
12 14 16 18 25 3
0
35 4
0
45 6
0
70 80 90
120 140 160 180 250 400
45
0
300
35
0
600
7
00
8
00
9
00
3
3.5
4
4.5 2.5
BRASS BODY
STEEL BODY
G (l/s) (gpm)
2
0,5
10
1 5
0,6 0,7 0,8 0,9 1,2 1,4 1,6 1,8 2,5
3
3,5
4
4,5
6 7 8 9
12 14 16 18 25 40 45
20
30 35
50
60 70
0,25 0,40 0,45
0,20
0,30 0,35
Hydraulic characteristics
The maximum fluid velocity recommended at the unit connections is
~
4 f/s. The following table shows the maximum flow rates to comply with
this condition.
BRASS BODY STEEL BODY
BRASS BODY STEEL BODY
Size
gpm
l/s
3/4”
6
0.4
1”
9.3
0.6
1 1/4”
15.3
1.0
1 1/2”
23.9
1.5
2”
36
2.28
2”
37
2.35
2 1/2”
62
3.9
3”
94
5.9
4”
148
9.3
5”
259
16.3
6”
376
23.7
Size
Cv
3/4”
18.8
1”
32.6
1 1/4”
56.6
1 1/2”
73.3
2”
81
2”
88
2 1/2”
176
3”
211
4”
328
5”
520
6”
842
1000
Efficiency
50 passages (1.6 f/s)
50 20 10
40
20
0
60
80
100
Efficiency (%)
Efficiency
50 passages (3.2 f/s)
Micro
particle
(µm)
0 5
16 35 63
105 150 250 210 500
Separated quantity
Initial quantity
.
100%
(
)
DIRDIRTCALTCAL
®
WORKING ZONE
CARTRIDGE FILTER
SPECIAL FILTER
Y-STRAINERS
Particle separation capacity - Dirt separator efficiency