1 pista grit screw conveyor

7/29/2019 1 PISTA Grit Screw Conveyor

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Onl ine : s mi tha nd lov e le s s .c om Phone : 9 1 3 .8 8 8 .5 2 0 1 FAX:9 1 3 .8 8 8 .2 1 7 3

Smith & Loveless Inc. System Innovators for global pumping, water and wastewater treatment

PISTA Grit Screw ConveyorThe second-stage PISTA Grit Screw Conveyor is

designed to work in concert with the complete PISTA

Grit Removal System, providing superb dewatering and

high retention of fine

grit without the burden

of high maintenance.

Dewatered grit

discharges into a

container for disposal

while the flow and

residual organics are

retuned to the inlet channel prior to the grit chamber,

typically 93% of the flow and 95% of the organics.

PISTA Grit Screw Conveyor

Introduced: 1989

System Benefit: Lamella plate design

aids in retention of fine

grit while reducing

turbulence & overflow

Upgrade from: Screens

Sizing: Models 15 & 17

Unique Design Elements Retain Ultra-Fine GritThePISTAGrit Screw Conveyors separate inlet zone, large Lamellaparallel plate section that acts as a high-rate settling device, and

double-sided weir trough work in concert to capture silt and and ultrafine grit. The inlet zone facilitates energy dissipation in order to reduceturbulence. This allows easier settling in the plate section while thelarger weir trough lowers the carry-over rate.

Ideal Upgrade for ScreensScreens are typically maintenance-intensive because of their messyoperation. Additionally, they can allow ultra-fine grit to be returned tothe flow stream. The PISTA Grit Screw Conveyor greatly reducesmaintenance concerns (and mess) while producing dryer grit.

Key Points

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The PISTA Grit Screw Conveyor retains ultra-fine grit and effectively washes and dewaters it fordisposal all in a hassle-free operation. Lamellaparallel plates facilitate high rate settling.

7/29/2019 1 PISTA Grit Screw Conveyor

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Onl ine : s mi tha nd lov e le s s .c om Phone : 9 1 3 .8 8 8 .5 2 0 1 FAX:9 1 3 .8 8 8 .2 1 7 3

Smith & Loveless Inc.System Innovators for global pumping, water and wastewater treatment

Complete Grit Removal, Handling & Dewatering System Flow Schem

PISTAGrit Chamber Influent enters flat-floor g

chamber hydraulically guided by coanda ramp, intern

baffles and central, low-speed propeller. Forced vort

drives grit particles to center chamber floor and into low

grit hopper while organics and flow continue to plant.

PISTATurbo Grit Pump Top-mounted or remo

mounted unit pumps collected grit slurry (kept fluid

the PISTAGrit Fluidizer) to the PISTAs second-sta

grit washing and dewatering system while also providi

proper head.

PISTAGrit Concentrator Specifically engineered

the PISTAsystem, this abrasion-resistant Ni-Hard u

washes grit further. It positions on the grit discharge lin

PISTA Grit Screw Conveyor Grit from t

concentrator deposits into the parallel (lamella) pla

section of the S&L dewatering screw conveyor, whi

aids in retaining finer grit and reducing the stream

turbulence and overflow rate.

Dewatered Grit Dischargesfrom the top of the inclin

screw conveyor into a container for disposal.

The Flow and any Residual Organics are Return

to the inlet channel prior to the grit chamber, typica

93% of flow and 95% of organics.

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For maximum grit removal, the PISTAGrit Chamber should be

complemented with Smith & Loveless PISTA grit handling and

ewatering components, which transport, dewater and prepare the grit

or final disposal. These components can be retrofitted to increase the

fficiency of your grit handling system originally equipped with older

omponents or non-Smith & Loveless accessories.

mith & Loveless commitment to market leadership in grit removal

indles on-going research and development, which leads to continued

ystem and component innovations. See the timeline below of key

PISTA

design milestones.

PISTA Grit Removal System Components & Schem

Unparalleled Innovation For 30+ Years

1973 - PISTAGrit Removal System (270)

1974 - PISTAGrit Screw Conveyor

1981 - 50 MGD PISTAGrit Chamber

1982 - PISTAGrit Turbo Grit Pump (4)

1982 - 175 GPM PISTAGrit Concentrator


1988 - 360 PISTAIn-Line Design


1989 - Parallel Plate PISTAGrit Screw Conveyor

1992 - PISTAGrit Fluidizer

1992 - 4 PISTAGrit Turbo Grit Pump

1998 - 6 PISTAGrit Turbo Grit Pump



2004 - PISTAGrit Flow Control Baffle

2006 - PISTAGrit Stick Deflector

1 pista grit screw conveyor

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