Popis
MAIN FEATURES
The KGK series Argal pumps are centrifugal and designed for vertical installations. They have column and volute casing submerged, own mechanical support and motor mounted above the liquid to be pumped. No metal part comes into contact with the fluid and not any bolts or nuts are submerged in the liquid. Under normal operating conditions, no mechanical sealing systems to prevent leaks of liquid are required while optional vapour seals are foreseen. Designed to pump corrosive chemicals have been engineered down to the smallest details to ensure long operating life and efficiency. Great care was paid to the KGK pumps right from the design board to ease maintenance and corrective operations for the repair crews internal or external to the companies served and for our worldwide net of distributors. The range of KGK pumps foresee three size ranges owing to different mechanical and hydraulic structure and the main parts subject to maintenance are the same for all the pumps belonging to each dimensional group.
CONSTRUCTION
These pumps are divided in two different constructive hydraulic
typologies: sizes G1 and G2 that have impellers and single-stage
volute casings working with centrifugal flows and size G3 that has
impellers and bodies generating semi-axial flows and can be either
at single-stage or double-stage with one or two impellers in series.
For all the pumps the hydraulic axial inlet connection is downwards and fitted with protective filter; the outlet radial connection
is joint to a vertical upward oriented discharge pipe to be connected to the hydraulic system, out of the tank, on the base plate.
The support includes the rolling bearing and the elastic coupling
and allow the central self-alignment of the normalized electrical
motor. The lubrication of the bearing is by grease for G1 and G2
sizes and oil for G3 size. Columns available in standard lengths are
from 500 to 4000 mm with increments of 250 mm.
MATERIALS
The materials wetted by the fluid pumped have excellent chemical resistance. The FC, WR and WF pump versions, completely constructed with thermoplastic or with column and delivery pipe made
of FRP, and finished with the different guide and wear bushings
specifications available, offer a wide combinations of chemically
resistant execution materials. To select the proper configuration
the concentration and temperature of the liquid pumped have to
be compared with the maximum values admissible by the chemical compatibility charts provided by our technical department for
the given liquid. This approach makes it possible to operate within
the proper safety margins and ensure reliable applications.
GUIDE BUSHINGS
The material of the guide bushing and wear bushings located in
the lower side of the pump close to the casing of the pump, are
respectively glass reinforced PTFE and AL2O3 or alternatively, for
solids or abrasive particles laden liquids, Silicum Carbide and Silicum Carbide. The bushings are lubricated by the liquid pumped,
but, for mentioned solids or abrasive particles laden liquids is available an auxiliary external water flushing device.
VAPOUR SEAL SYSTEMS
To contain the vapours developing inside the pump in static and
dynamic conditions a V ring dry vapour seal is located close to the
base plate. On request is possible to add a dynamic deflector or
a fluid barrier vapour system. It operates feeding modest quantities of compressed air or water with a push in rapid connector to
build up a counter pressurised laminar flow and prevent vapours
or poisonous gasses to flush the
mechanical parts
and escape in the
environment.
MOTORS
The KGK pumps
are equipped with
electric motors fully compliant to IEC
standards 400V +/-
5% voltage, multi frequency 50-60Hz
frequency, tropicalised, IP 55 protection
class F insulation, and B5 shape. Different
degrees of protection and different voltages can be supplied on
request. The 2-pole rotors have a rotating speed of 2900 rpm (50
Hz) and 3500 rpm (60Hz) and the 4-pole motors of 1450 rpm (50
Hz) and 1750 rpm (60Hz).
PAINTWORK
The support to host the pump shaft bearings and the electric motor flange (both of casted iron) are protected with epoxy enamel
painted over an appropriate primer undercoat.
QUALITY
The single components as well as the complete pump are subjected to a quality control plan. For example we can certify on request composition and origin of the row materials, balancing test,
hydrostatic test. The functional test is executed accordingly to ISO
9906 Grade 2 – Annex 1 regulation. Our pumps comply with CE
standards on machine safety and are supplied with all the relevant
documentation. The installation use and maintenance manual
must be carefully read and strictly followed by the user.
APPLICATIONS
Handling of acid, hydroxide and salt solutions in different concentrations and temperatures: mixture of strong acids, electrolytic
baths, aromatic hydrocarbons, chlorides, alcohol, glycol ethers,
emulsions, etc. from tanks, reservoirs and collection sumps. Liquids
with a specific weight of up to 2 kg/dm3 can be handled according
to the installed power; maxim kinematics viscosity of 75 cSt and
maxim temperature of 90°C to be reduced accordingly to the type
of pump, type of material and length of the column as detailed in
the table 4.
