Bombas para Tratamiento de Efluentes SALVATORE ROBUSCHI con Impulsor tipo VORTEX, fabricadas en acero inoxidable AISI 316L

1. ATI GROUP
Soluciones de Ingeniería
Plantas y Equipos de Proceso
Portafolio
Bombas SALVATORE ROBUSCHI
para Tratamiento de Efluentes

2. SALVATORE ROBUSCHI
waste water pumps

3.  DIRTY LIQUIDS: SELECTION OF IMPELLERS
 DIRTY LIQUIDS: SELECTION OF MECHANICAL SEALS
 WEAR PROOF MATERIALS AND COATINGS
 SOME APPLICATIONS
 OUR REFERENCES

4. DIRTY LIQUIDS: SELECTION OF IMPELLERS
In according to the pumped medium we can select different impeller
types:
• semi-open• closed
• vortex• channel

5. DIRTY LIQUIDS: SELECTION OF IMPELLERS
CLOSED IMPELLER
Closed impeller or totally enclosed impeller are designed with blades
between two support or shrouds.
Solid’s contamination will destroy the tolerances
between impeller and wear ring: these tolerances
govern the efficiency of the pump
These impellers are for totally clean liquids because there is no
room for suspended solids, crystals, sediments or air.

6. DIRTY LIQUIDS: SELECTION OF IMPELLERS
SEMI-OPEN IMPELLER
Semi-open impeller has exposed blades with a wearing plate
These types of impeller are generally used for liquid with a small
percentage of solid particles like sediment (not abrasive), short
fibers, crystals mixed with water and air.
The efficiency is the same of closed
impeller
These types of impeller are not suitable for
medium with abrasive solids, hard particles
and long fibers

7. DIRTY LIQUIDS: SELECTION OF IMPELLERS
MULTI-CHANNEL IMPELLER
The big suction inlet and the few blades reduces the inlet speed and
grants very good suction characteristics, also with gas, air or solids.
Same efficiency than closed impeller with bigger free passage

8. DIRTY LIQUIDS: SELECTION OF IMPELLERS
MULTI-CHANNEL IMPELLER
Multi-channel impeller allows suspended solids (not
filamentous) to be transferred without pump
clogging
As for closed impeller, solid’s
contamination will destroy the tolerances
between impeller and wear ring: these
tolerances govern the efficiency of the
pump

9. DIRTY LIQUIDS: SELECTION OF IMPELLERS
VORTEX IMPELLER
THE SOLUTION FOR
WASTE WATER
85% of the pumped fluid is
transported directly from the primary
vortex to the pressure connection. Only
15% of the fluid being pumped comes
in contact with the impeller (secondary
vortex)
The impeller spins in an area of the volute that is completely out of
the liquid flow path. The spinning creates a vortex similar to that you
can find in a tornado.

10. DIRTY LIQUIDS: SELECTION OF IMPELLERS
VORTEX IMPELLER
These types of impeller are generally used
for dirty medium, containing sediments
(even abrasive), long fibers, crystals mixed
with water and air.

11. DIRTY LIQUIDS: SELECTION OF IMPELLERS
VORTEX IMPELLER
Vortex impeller is completely recessed, out of the
flow path.
The effiency of this pump is lower than semi-open
impeller.

12. DIRTY LIQUIDS: SELECTION OF MECH. SEALS
The most common mech. seal executions for dirty liquids are:
Gland packing (with or without external flushing)
Single mechanical seal (with or without external flushing)
Double seal (tandem or back-to-back)

13. DIRTY LIQUIDS: SELECTION OF MECH. SEALS
GLAND PACKING
Through the stuffing box and the gland follower,
the packing is compressed to accommodate the
interior bore of the stuffing box and the shaft
surface, sealing the pumped liquid.
It is a good practice to tighten the gland just
enough to allow for a minimal leak through the
packing
A lantern ring substitues one the packing ring to
supply ‘back pressure’, which aids in impeding the
entrance of abrasive and corrosive material into
the stuffing box

14. DIRTY LIQUIDS: SELECTION OF MECH. SEALS
SINGLE SEAL
This type of seal mounts onto the shaft or sleeve
inside the seal chamber and pump. The pumped liquid
comes into contact with all parts of the seal and
approaches the outside diameter of the internally
mounted faces keeping them lubricated
This is the most popular type of mechanical seal in clean (no solid
particles or crystals) liquid service
In case of dirty liquids we suggest PLAN 32 (clean water injection in
the seal chamber) to keep clean and lubricated the mech. seal

15. DIRTY LIQUIDS: SELECTION OF MECH. SEALS
DOUBLE SEAL: TANDEM
This type of seal is installed instead of single seal
when you have to
 protect the primary seal from run dry
 reduce the temperature of primary seal
 create a buffer in case of dangerous liquid
The flushing liquid in the area between the two seals
MUST be pressurized at 0,3bar

16. DIRTY LIQUIDS: SELECTION OF MECH. SEALS
DOUBLE SEAL: BACK-TO-BACK
The flushing liquid in the area between the two seals
MUST be pressurized at 0,5bar more than discharge
pressure
This type of seal is installed instead of single seal
when you have to
 work in vacuum
 pump dirty medium (high solids %)
 create a buffer in case of dangerous liquid
pump sticky liquid (e.g. paint, resin)
pump polymers or resin
pump aggressive medium

17. DIRTY LIQUIDS: SELECTION OF MECH. SEALS
For most applications, single mechanical seal will adequately
handle every pump, liquid, and condition.There are, however, some
pumping applications that will present problems to even the best of
mechanical seals
Slurries and Suspended Solids
Should be purged or flushed with:
•Water
•Filtered or cleaned product a compatible liquid
•A posterior additive in the system
Liquids that solidify
To deal with liquids that try to solidify (think of ice, cement, glue and paints) it is necessary
to identify the cause and solution for the solidification:
Air (paint, glue)Quench and Drain or the Double Seal
Change in Temperature (ice) Control the temperature, either up or down

18. DIRTY LIQUIDS: SELECTION OF MECH. SEALS
Dry Running Pump
Again, no lubrication or dissipation of heat. Remove the heat with a double seal and barrier
tank with forced convective flow.
Film or Skin Formation
Some liquids form a skin (like hot milk) with heat. Others form a film (like paints) on
contact with air.
Temperature control See Crystallization.
Contact with air Double seal with pressurized barrier fluid
Crystallization
Some liquids form crystals with heat (think of sugar and rock candy), and others with cold
(think of ice).
To control and prevent crystallization in the seal chamber it is necessary to control the
temperature using:
•External Flush
•Thermal Jacketed seal chamber
•Quench and Drain
•Dual Seal

19. WEAR PROOF MATERIALS AND COATINGS
To increase the life of impeller and casing, we can select special
materials or special coatings:
CAST IRON HG 15.3 hardness 600 Brinell
Excellent protection against wear
No protection against chemical aggression
CA6NM ALLOY hardness 400 Brinell
Good protection against wear
Good protection against chemical aggression

20. WEAR PROOF MATERIALS AND COATINGS
CAST IRON HG 15.3 hardness 600 Brinell
Excellent against wear
No protection against chemical aggression
BELZONA 1313 ceramic paint
Good protection against wear
Good protection against chemical aggression

21. WEAR PROOF MATERIALS AND COATINGS
When the pumped medium contains abrasive particles:
 Use vortex impeller
 Decrease, if possible, the pump speed
 Don’t use impeller with max diameter
 Verify the pH of pumped medium
 Flush the mechanical seal (using plan 32 or double seal)

22. SOME APPLICATIONS
VORTEX IMPELLER
Liquid: waste water with
tomatoes skin, grass and soil
VORTEX IMPELLER
Liquid: sludge recirculation

23. SOME APPLICATIONS
VORTEX IMPELLER
Liquid: sludge (biomass)
recirculation
VORTEX IMPELLER
Liquid: sludge (biomass) concentration
(with high vacuum)

24. SOME APPLICATIONS
VORTEX IMPELLER
Liquid: DAF system

25. SOME APPLICATIONS
VORTEX IMPELLER
Liquid: fish waste

26. REFERENCES
PESQUERA POLAR ECUADOR
EEKELS
KEMIRA
TOMSA DESTIL
SIEMENS WASTE WATER
ENEL POWER
AREVA
SANOFI
VEOLIA
TMCI PADOVAN
CFT
NAVATTA GROUP
FENCO
HRS SPIRATUBE
ALFALAVAL
SOFINTER – SWS
ARKEMA
WATERLEAU
STORK MAREL
PROCTER & GAMBLE
CHEVRON
CAVIRO
WATER ENGINEERING
ECOTECNO
ECOINTERNATIONAL
CONDOROIL
VILOKAN
WIENTJENS
SHELL
MINGAZZINI
PROTECNO
LUCCHINI
ENEL
AGIP
ALMA PETROLI
LA PETROLIFERA ITALO-RUMENA
YARA
TEKNODEPURAZIONI

27. ATI GROUP
Contacto
Telmo Becerra
+51 990 722 336
telmo@ati.com.pe
Calle Pedro Yrigoyen 285 Of. 101
Miraflores- Lima 18 PERU
Tlf. 637 7900