Product Overview

1000
Efficiency
50 passages (2 f/s)
50 20 10
40
20
0
60
80
100
Efficiency (%)
Efficiency
50 passages (4 f/s)
Micro
particle
(∆m)
0
5
16 35 63
105 150 250 210 500
Separated quantity
Initial quantity
.
100%
(
)
WORKING ZONE
CARTRIDGE FILTER
SPECIAL FILTER
Y-STRAINERS
DIRTCAL
WORKING ZONE
DIRTMAG
Particle separation capacity — dirt separator efciency
Separation efciency
The capacity for separating the dirt in the medium circulating in the
closed circuits of the hydronic systems depends on three factors:
1. It increases as the size and mass of the dirt particle increases.
Thelarger and heavier dirt particles drop before the lighter ones.
2. It increases as the fluid velocity decreases. When the velocity
decreases, there is a low-velocity-zone inside the dirt separator and
the dirt 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 continuous separation, until the
dirt particles are completely removed.
The special design of the internal mesh element in the Caleffi DIRTCAL
®
and DIRTMAG
®
dirt separator, is able to completely separate the dirt
particles in the circuit down to a minimum particle size of 5 μm (0.2
mil), including 100% ferrous impurities. The adjacent graph illustrates
how these separators quickly remove nearly all the dirt particles. 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.
1.4
1.8
0.060
0.040
0.20
0.27
0.53
0.47
2.00
2.33
2.67
0.23
0.30
0.40
0.17
0.33
0.67
1.67
3.33
3.00
0.60
1.00
1.33
0.13
0.10
0.053
0.033
0.067
0.047
G (l/
s
)
(gpm)
2.2
4.4 8.8
22.0
2.6 3.0 3.5
3.96
5.3
6.15
7.045
7.9
11.0 13.2 15.4 17.6 19.8
0.5
1
2
5
10
0.1
0.2
9
8
7
6
4
3
1.6
1.2
0.8
0.6
0.7
0.9
0.4
0.3
0.18
0.12
0.16
0.14
∆ P (kPa)
0.25
0.35
0.45
2.5
3.5
4.5
0.83
1.17
1.50
0.083
0.12
0.15
1.1 1.3 1.5
1.7
1.98
0.88
0.20
0.26
0.073
1.5
1.3
1.2
1.0
0.9
0.58
0.41
0.23
0.17
0.12
0.09
0.10
0.13
0.06
0.04
0.026
0.017
0.023
0.020
(PSI)
0.036
0.05
0.07
0.36
0.51
0.65
0.71
0.16
0.029
0.016
∆p (ft. of water)
139
278 556
1388
167 194 222 250 333 389 444 500 694 833 972
1111 1250
69 83 97
111 125
56
DIRTCAL
®
/
DIRTMAG
®
curve
3/4”– Cv =19
Y-strainer curve
3/4” - Cv=8.2
Comparison of head losses:
dirt separator to Y-strainers
Y-strainers entrap dirt within a basket made of stainless steel or brass
mesh, selected for the size of the largest particle. Particles smaller
than the mesh size may pass through. On most Y-strainers, the basket
must be removed periodically to clear the trapped debris. As the debris
collects in the basket, flow is impeded resulting in increasing pressure
drop and therefore higher head loss. The dirt separation function in the
DIRTCAL
®
and DIRTMAG
®
utilizes the low-velocity-zone principle. The
flow velocity of fluid flowing into the dirt separation chamber is greatly
reduced causing the entrained dirt particles to drop due to their density.
The internal element provides surfaces that assist in separating dirt particles
and guide them downward to ultimately settle to the bottom of the
separator. The dirt separator only creates about 25% of the pressure
drop of a comparable sized, clean basket Y-strainer, depending on
mesh size and amount of filtered debris. These head losses are not
affected by the amount of dirt collected.