5
1
CONSTRUCTIONAL-DIMENSIONAL
TECHNICAL CHARACTERISTICS
1.1 - CONSTRUCTION
OF THE ELLPREX BOILERS
The
ELLPREX boilers are of horizontal type
(oval till the ELL 970 and cylindrical from ELL
1100) with flame reversion in the
combustion chamber and with third pass in the
smoke pipes.
The construction completely satisfies the
requirements of the EN 303 - part 1.
The sheet metal parts of the pressure vessel
are manufactured of certified carbon steel, type
S235JRG2, according to EN 10025, with melting
certificate 3.1.B, according EN 10024; where
as the pipes are of steel ST 37.0 according to
DIN 1626.
The welders and the WPS (Welding Procedures
Specifications) have been approved accordin to
EN 287 and EN 288 by TÜV (DE).
These boilers have been also approved by -
ISCIR (RO).
Up to the model ELL 630 the furnace is linked
to the rear tube plate.
For the larger models (ELL 760 to ELL 3500)
the furnace is free to dilatate (it is supported
only by the double welding seam (inner and
outer) to the front tube plate.
For models with ELL 4000 to ELL 7000 the
furnace is linked to the rear tube plate.
The boilers are equipped with a reversible hinged
door, which can be opened, for this reason, from
L.H. or R.H. side.
The outer shell is insulated with a glass wool
matress, thick 80 mm, protected by a textile
in mineral fiber.
For models from ELL 4500 to ELL 7000 the
outer shell is insulated with a felt lamellar
matress, thick 50 mm, protected by an alumi-
fig. 1
1.2 - WORKING PRINCIPLE
The ELLPREX boilers are provided with a blind
furnace in which the burner makes a central
flame, the combustion gases come back to the
front door and then they enter the upper or
peripheral tube bundle, according to the boiler
model, to be collected on the rear smoke
chamber, and from here to the chimney.
During the operation of the burner within the
output range of the boiler, the combustion
chamber is always under positive pressure.
For the value of this pressure see tables on
pages 6 to 10, under the column “Smoke side
pressure losses”.
The chimney has to be calculated in such a
way that at its base there is no positive
pressure.
num sheet.
The upper part of the outer shell is equipped
with uplift hook(s).
Note:The ELLPREX boilers are to be equipped
with ON/OFF burner; alternatively they can
be equipped with a two stage or modulating
burner, provided the minimum reachable
heat input is not lower than the figure shown
on the data plate for the fuel used on site.
The boilers are provided with two 1/2" bulb
holders with inner diameter of 15 mm (for 3
bulbs each), suitable to locate the thermostats
and thermometer bulbs.
The casing side panels are provided with ho-
les for the cables of the electrical supply, of
the pumps, of the burner and any other au-
xiliary equipment.
To Next Page
Loading...
Need help?
General