Product Overview

Steel DISCALDIRT
®
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Construction details
The DISCALDIRT
®
air and dirt separator is designed to be maintained
and cleaned without removing it from systempiping.
The automatic air vent, located at the top of the device, has a long chamber for
float movement (2). This prevents any impurities in the water from reaching
the seal seat. The corrosion resistant stainless steel pinned linkage and
PP float can be accessed by removing the upper cover (1). The stainless
steel float guide pin (4) prevents the float from jamming against the inside
housing, sticking due to accumulating residue in the flowing fluids, in non-vertical
installations or from boiler or chiller residue buildup.
Unscrew the top part of the casing (3) to clean the entire air ventingsystem.
The air venting system in the brass DISCALDIRT
®
and steel DISCALDIRT
®
air and dirt separators features a pinned float.
Steel DISCALDIRT
®
air and dirt separators with flanged and threaded
connections have an integral side drain port with shutoff valve, code
538402 FD (5), which has two functions:
1. Air removal while filling the system during system commissioning.
2. Debris removal that float within the air separator.
The drain valve (code NA39753 - 1 inch or code NA59600 - 2 inch) installed
on the drain pipe at the base of the steel DISCALDIRT
®
air and dirt separator (8)
can be used to remove any debris that has settled at the bottom of the
separator, even while the system is in operation. To inspect the internal
element of brass DISCALDIRT
®
air and dirt separators, unscrew the large
dirt separation chamber (6) with a 26 mm hexagon wrench. The internal
element can be removed for cleaning. Additionally, the brass air and dirt
separators have a lever operated shut-off drain valve code 538402 FD, and
¾" garden hose attachment with plug (7), to drain accumulated debris as
needed.
Draining off dirt and ferrous impurities
The dirt separator collection chamber has a drain valve. Using the handle
provided it is possible to drain off the accumulated dirt particles even
with the system in operation.
Brass DISCALDIRT
®
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Steel DISCALDIRT
®
Particle separation rating – dirt separator efciency
1000
Efficiency
50 passages (0.5 m/s)
50 20 10
40
20
0
60
80
100
Efficiency (%)
Efficiency
50 passages (1 m/s)
Particle
dimensions
(µm)
0 5
16 35 63
105 150 250 210 500
WORKING ZONE
CARTRIDGE FILTERS
SPECIAL STRAINERS
Y-STRAINERS
Separated quantity
Initial quantity
.
100%
(
)
Tests in a specialized laboratory
TNO - Science and Industry (NL)
®
Separation efciency
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 DISCALDIRT
®
air
and dirt separators, are able to completely separate the impurities in the
circuit down to a minimum particle size of 5 μm (0.2 mil).
The particle separation — dirt separator efficiency graph (left) illustrates
how DISCALDIRT
®
quickly separates nearly all the impurities. After only
50 circulations, approximately one day of operation, up to 100% is effec-
tively 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.