Bombas para Tratamiento de Efluentes SALVATORE ROBUSCHI

ATI GROUP Soluciones de IngenieríaPlantas y Equipos de Proceso

Portafolio Bombas SALVATORE ROBUSCHI para Tratamiento de Efluentes

SALVATORE ROBUSCHIwaste water pumps

DIRTY LIQUIDS: SELECTION OF IMPELLERS

DIRTY LIQUIDS: SELECTION OF MECHANICAL SEALS

WEAR PROOF MATERIALS AND COATINGS

SOME APPLICATIONS

OUR REFERENCES


In according to the pumped medium we can select different impeller types:

• semi-open• closed

• vortex• channel


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.


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


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


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


VORTEX IMPELLERTHE SOLUTION FORWASTE 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.


VORTEX IMPELLER

These types of impeller are generally used for dirty medium, containing sediments (even abrasive), long fibers, crystals mixed with water and air.


VORTEX IMPELLER

Vortex impeller is completely recessed, out of the flow path.

The effiency of this pump is lower than semi-open impeller.

DIRTY LIQUIDS: SELECTION OF MECH. SEALSThe 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)

DIRTY LIQUIDS: SELECTION OF MECH. SEALSGLAND 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

DIRTY LIQUIDS: SELECTION OF MECH. SEALSSINGLE 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

DIRTY LIQUIDS: SELECTION OF MECH. SEALSDOUBLE 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

DIRTY LIQUIDS: SELECTION OF MECH. SEALSDOUBLE 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 liquidpump sticky liquid (e.g. paint, resin)pump polymers or resinpump aggressive medium

DIRTY LIQUIDS: SELECTION OF MECH. SEALSFor 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 SealChange in Temperature (ice) ➔ Control the temperature, either up or down

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

WEAR PROOF MATERIALS AND COATINGSTo increase the life of impeller and casing, we can select special materials or special coatings:

CAST IRON HG 15.3 hardness 600 BrinellExcellent protection against wear No protection against chemical aggression

CA6NM ALLOY hardness 400 BrinellGood protection against wearGood protection against chemical aggression

WEAR PROOF MATERIALS AND COATINGS

CAST IRON HG 15.3 hardness 600 BrinellExcellent against wear No protection against chemical aggression

BELZONA 1313 ceramic paintGood protection against wearGood protection against chemical aggression

WEAR PROOF MATERIALS AND COATINGSWhen 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)

SOME APPLICATIONS

VORTEX IMPELLER Liquid: waste water with tomatoes skin, grass and soil

VORTEX IMPELLERLiquid: sludge recirculation

SOME APPLICATIONS

VORTEX IMPELLER Liquid: sludge (biomass) recirculation

VORTEX IMPELLER Liquid: sludge (biomass) concentration (with high vacuum)

SOME APPLICATIONS

VORTEX IMPELLER Liquid: DAF system

SOME APPLICATIONS

VORTEX IMPELLER Liquid: fish waste

REFERENCESPESQUERA POLAR ECUADOREEKELSKEMIRATOMSA DESTILSIEMENS WASTE WATERENEL POWERAREVASANOFIVEOLIATMCI PADOVANCFTNAVATTA GROUPFENCOHRS SPIRATUBEALFALAVALSOFINTER – SWSARKEMAWATERLEAUSTORK MAREL

PROCTER & GAMBLECHEVRONCAVIROWATER ENGINEERINGECOTECNOECOINTERNATIONALCONDOROILVILOKANWIENTJENSSHELLMINGAZZINIPROTECNOLUCCHINIENELAGIPALMA PETROLILA PETROLIFERA ITALO-RUMENAYARATEKNODEPURAZIONI

ATI GROUP

Contacto

Telmo Becerra +51 990 722 336 [email protected]

Calle Pedro Yrigoyen 285 Of. 101Miraflores- Lima 18 PERUTlf. 637 7900

mailto:[email protected]

Bombas para Tratamiento de Efluentes SALVATORE ROBUSCHI

Engineering

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