PRODUCTS AND SERVICES
Drakos Polemis consists of the following
operational sectors:
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Rural - Agriculture
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Construction
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Marine - Small Crafts
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SME Industries
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Pisciculture
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Chemical Industry
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Food Industry
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Building Technical Projects
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Hydraulic Technical Projects
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Water Resource Management
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Environmental Projects
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Energy
Pumps and Devices for the Environment
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Wastewater Pumps (submersible and dry version)
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Aeration Systems - Filters - Separators (Centrifugal
and Mechanical)
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Portable Biological Stations
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Small Hydropower Stations
Applications: For circulating clean, non-corrosive
fluids. Heating and air-conditioning. Water supply. Circulating
installations.
Hydraulic: Data Capacity up to 300 m3 / h. Total
head up to 90 m. Temperature up to 140o C. Pressure up to
10 bar.
Design features: Single stage centrifugal pump of
IN LINE type in compact design. Motor and pump are close coupled.
IL type. Motor with special shaft-end and flange to fit the
pump. Mounting V1. IL - N type. Standard motor with mounting
V1. Suction and discharge flanges being of the same diameter
and arranged opposite to each other can be directly mounted
in the pipe line. Flanges according to DIN 2532. Back pull
out design allows easy access to rotating elements for routine
maintenance without disturbing pipe- work. Simple installation.
No alignment problems. All pumps fitted with self - adjusting
mechanical seals, of design proven to eliminate gland leakages.
Capability of horizontal and vertical installation (see also
page 5). Vertical installation only possible with motor above
pump. The pump is usually supported by the piping but it can
also be supported by a special bracket on request.
Applications For fire service applications to E.L.O.T. Standards.
For clean or turbid liquids, free from large solids. For pumping
water, petrol, benzene, oil, brine, alkaline solution and mild
acids. For circulation, irrigation and drainage purposes. For
water supply and booster stations. For industrial and agricultural
applications and in public services.
Hydraulic data Capacities to 1700 m3 / h.
Temperature -20o to 140o C.
Max working pressure up to 12 bar.
Design Features: Single-stage, end-suction volute
design with vertically arranged radial discharge branch. Single
entry, closed impeller. Heavy-duty grease lubricated-for-life
ball bearings in sturdily constructed housing flanged to pump
casing. Axial thrust is balanced by means of back seal rings
and balance holes. Maintenance is very easy the impeller, shaft
and other rotating parts being removeable without having to
disconnect the suction or delivery pipework. In fact the use
of an extension coupling enables the pumps to be dismantled
without moving either the driver or the pump casing. Maximum
interchangeability of components. Identical parts can be used
with various sizes of pumps, which greatly simplifies and reduces
stock of spare parts.
Applications: For clean or turbid liquids, free from
large solids. For pumping water, petrol, benzene, oil, brine,
alkaline solutions and mild acids. For circulation, irrigation
and drainage purposes. For water supply and booster stations.
For industrial and agricultural applications and in public services.
Hydraulic data: Capacity up to 2000 m3 / h.
Temperature up to 110o C.
Design Features: Single stage end suction volute design
with vertically arranged radial discharge branch. After a specific
requirement, volute design with horizontally arranged branch
is possible. Single entry, closed impeller. Heavy duty grease
lubricated ball bearings in sturdily constructed housing flanged
to pump casing. Maintenance is very much easier, the impeller
shaft and other rotating parts being removeable without having
to disconnect the suction or delivery pipe work. In fact the
use of one extension coupling enables a pump to be dismantled
without moving either the driver or the pump casing.
Applications: Pumping clear to slightly dirty and
corrosive liquids: medium duty services for: · Chemical and
process industries · Oil, petroleum products · Industrial chemicals
· Circulation, booster systems · Fire fighting · Environmental
engineering
Hydraulic data: Capacities to: 500 m3 /hr Heads to:
160 m
Temperature to: 200 deg C
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Driver arrangements options
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Applications: For clean or turbid liquids, free from
large solids. For pumping water, petrol, benzene, oil, brine,
alkaline solution and mild acids. For circulation, irrigation
and drainage purposes. For water supply and booster stations.
For Industrial and Agricultural applications and in public services.
Hydraulic data: Capacity up to 300 m3 / h.
Temperature up to 140o C.
Design features: Single stage centrifugal pump in
compact design. Back pull-out design allows easy access to rotating
elements for routine maintenance without disturbing pipework.
Simple installation. No alignment problems. All pumps fitted
with self adjusting mechanical seals, of design proven to eliminate
gland leakage. Possibility of horizontal and vertical installation
(see also page 4). Vertical installation only possible with
motor above pump. Standard motor, motorstool flangeDIN 42948.
Direction of rotation: Clockwise looking from the
motor end.
Applications: For circulating clean, non-corrosive
fluids. Heating and air-conditioning. Water supply. Circulating
installations.
Hydraulic Data: Capacity up to 300 m3 / h.
Temperature up to 140o C.
Design features: Single stage centrifugal pump of
IN LINE type in compact design. Motor and pump are close coupled.
IL type. Motor with special shaft-end and flange to fit the
pump. Mounting V1. IL - N type. Standard motor with mounting
V1. Suction and discharge flanges being of the same diameter
and arranged opposite to each other can be directly mounted
in the pipe line. Flanges according to DIN 2532. Back pull out
design allows easy access to rotating elements for routine maintenance
without disturbing pipe- work. Simple installation. No alignment
problems. All pumps fitted with self - adjusting mechanical
seals, of design proven to eliminate gland leakages. Capability
of horizontal and vertical installation (see also page 5). Vertical
installation only possible with motor above pump. The pump is
usually supported by the piping but it can also be supported
by a special bracket on request.
Applications: In waterworks, irrigation and sprinkler
installations. As a recirculating pump for cooling and heating
water and also as a fire-fighting, boiler feed or pressure boosting
pump. The MS type pumps are used for handling clean or only
lightly contaminated media, for oils up to 150 mm2 /sec (cst)
and for non- aggressive liquids.
Hydraulic Data: Capacity up to 550 m3 /h.
Total head up to 300 m. T
emperature -20o C to 140o C.
Max casing pressure 30 bar (suction pressure + shut-of head).
Design features: The pump casing consists of a number
of sectional stages, held together by large - diameter tie bolts.
All impellers are balanced. Axial thrust is compensated for
by balance holes in each impeller. The pump shaft is protected
against wear by sleeves through the stuffing box. The pump features
bronze wearing rings on both sides of the impellers. All wear
parts such as impellers and shaft sleeves are easily replaceable
and the glands are readily accessible. The by-pass arrangement
relieves the pressure on the delivery side stuffing box and
provides a perfect water seal in the suction stuffing box, even
at maximum suction lift. Sealing with gland packing or meckanical
seal. Branches: PN 16 DIN 2533 PN 40 DIN 2535
Max. permissible no of stages
Applications: In waterworks, in irrigation and sprinkler
installations. As a recirculating pump for cooling and heating
water, and also as a fire fighting, boiler feed or pressure
boosting pump. The pumps are used for handling clean or only
lightly contaminated media, for oils up to 150mm2 /sec (cst)
and for non- aggressive liquids.
Hydraulic data: Capacity up to 100 m2 /h
Max casing pressure (suction pressure + closed valve head)
40 bar.
Temperature -20o C to 140o C.
Maximum number of stages and motor size:
Design: The pump casing consists of a number of sectional
stages, held together by large diameter tie bolts. All impellers
are balanced. Axial thrust is compensated for by balance holes
in each impeller. The pump shaft is protected against wear by
sleeves through the stuffing box. It is supported in amply dimensioned,
externally housed, heavy duty bearings. All wearing parts such
as impellers, diffusers, diffuser plates, and shaft sleeves
are easily renewable and the glands are readily accessible.
The by-pass arrangement relieves the pressure in the delivery
stuffing box and provides a perfect water seal in the suction
stuffing box, even at maximum suction lift. Sealing with packing
or mechanical seal.
Pressure Boosters (BS, BL/BCL, BV)
INTRODUCTION TO AQUAPRESS
In most cities due to the rapid increase of population and
high-rise buildings, the water mains, which were designed and
constructed decades ago, are not suitable for today's needs.
Low pressure in the mains causes inadequate water supply to
many consumers, even though there may be sufficient water to
meet the demand. The best solution for such cases is pressure
booster. On the other hand, fire extinguishing systems constitute
an important safety element for the protection of multi- storey
buildings such as hotels, hospitals and offices or crowded places
such as movie theatres, clubs, etc. In such cases the necessary
water pressure, as specified by the Fire Authorities can be
obtained by means of a fire pump system which resembles pressure
booster in the basic operational principles but differs in the
automation used. The standardized manufacture of pressure boosters
and fire pump systems reduces the cost and minimizes the possibilities
of assembly errors. Custom-built systems are manufactured only
in cases requiring specific needs. The AQUAPRESS pressure boosters
and fire pump systems manufactured by "DRAKOS - POLEMIS" are
compact units: permitting direct connection to the water and
electricity mains. Each one of them is self contained and fully
automatic, packaged with pumps, motors, pressure tank, electric
control panel and accessories, all pre-wired and assembled on
a common base frame. Special attention is given to the protection
of electric motors whenever frequent startings are likely to
occur due to the small capacity of the pressure tank as in the
case of AQUA- PRESS BS. When a large capacity pressure tank
is needed there is a choice between AQUAPRESS BL and AQUAPRESS
BLC, the former using membrane pressure tank and the latter
a pressure tank-air compressor combination. By using a frequency
converter for variable speed control of the pumps in AQUAPRESS
BV the need for a pressure tank is abolished and considerable
energy savings are also attained.
Pressure booster with membrane pressure tank of small
capacity
The pressure tank has a small capacity and utilizes an elastic
membrane to separate water from gas. This is suitable for installations
where during specific periods of the day the water demand has
relatively small fluctuations and for the rest of the day the
demand is random and low. A factory using water for production
purposes is an example of such an installation. Suitable automation
is provided to avoid frequent startings and high pump temperatures.
Pressure booster with membrane pressure tank of large
capacity
AQUAPRESS BL has a pressure tank of relatively large capacity
and utilizes an elastic membrane to separate water from gas.
This is suitable for installations where the water demand
changes considerably throughout the day. The capacity of the
pressure tank is computed by taking into account the maximum
allowable number of electric motor startings per hour and a
graphical representation of water consumption per day.
Pressure booster with pressure tank of large capacity
and air compressor
AQUAPRESS BLC is suitable for installations where the consumption
needs require a pressure tank capacity greater than 1000-2000
litres. In this case the pressure tank fitted has no membrane
and an air compressor is employed to replace the air absorbed
by the water. Apart from this difference, AQUAPRESS BL and AQUAPRESS
BLC are similar.
AQUAPRESS BV 201, 301, 401 A,P
Pressure booster with variable speed contro
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This system features a frequency converter which controls
pump speed, thus matching delivery to water demand and eliminating
the need for pressure tank. The AQUAPRESS BV presents the following
important advantages when compared to AQUAPRESS BS, BL and BLC.
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Constant pressure for all water capacities from zero
to maximum.
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Continuous running of pump units thus eliminating wear
of electric motors and automation due to frequent startings.
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No water-hammer effects since the quantity of water pumped
from the mains is equal to the consumption demand each time
and therefore direct connection to the mains for all installations
is possible.
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Electronic regulation without interposition of contacts.
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Reduced space requirements.
Aquapress F Fire pump systems: The design and manufacture
used for the F systems are similar to those of pressure boosters
BS, BL and BLC. These are utilized in fire extinguishing installations
and selection depends on the customers' requirements, the standards
of the Greek Fire Authority, the British FOC or the NFPA of
U.S.A.
This consists of pump units driven by electric motors and
small capacity membrane pressure tank. Suitable automation control
is provided to avoid frequent startings, and by-pass to prevent
temperature rise, while pumps work near zero delivery.
It is similar to F100 except that a diesel engine-driven
pump is included to take over in case of electrical supply breakdown.
When the projected installation requires high capacity pump
units a small, auxiliary, electric motor driven pump unit (jockey)
is also included. The pressure tank in conjuction with the jockey
pump unit compensate for system leakage and maintain prescribed
pressure.
This consists of pump unit(s) solely driven by diesel engine(s).
In all automatic cut-out fire pump systems there is flow switch
at suction so that the main pump stops only when the water supply
to the fire pump system approaches zero. Thus the main pump
carries on supplying the installation even at maximum pressure.
Stoppage of the pump is delayed via a time switch thus limiting
the frequency of cycles.
Important note: Our team of specialized engineers
continuously follow the latest developments in all related areas
and ensures the application of advanced technology in the design
and manufacture of our pressure boosters and fire pump systems.
Due to the peculiarities of each installation it is advisable
to contact us when preparing an inquiry so that the finally
prescribed pressure boosters and fire pump systems offer the
best solution in terms of initial cost, energy consumption and
operational safety.
