WEMCO® Hydrogritter® II Complete Grit Removal Package From Weir Specialty Pumps, manufacturer of WEMCO® equipment

The problem

Grit creates a costly burden on basins, digesters, and clarifiers damages equipment wears out pumps increases maintenance costs settles out everywhere Too much grit can eventually shut down an entire treatment plant if not properly removed

Manual grit removal is costly, time consuming, messy, and labor intensive.

the solution

WEMCO® Hydrogritter® II Complete Grit Removal Package WEMCO® Hydrogritter Grit Classifier CAVEX® Cyclone Grit Pump Grit Disposal Pump Suction Piping Cyclone Return Piping Vent to Atmosphere Grit Chamber (Grit Source) Pump Discharge Piping

How does the Hydrogritter® II system work?

1. Grit settles out of the influent flow in the grit chamber (or other grit source).

2. Grit is pulled from the source, through the grit pump and pumped to the cyclone. Grit Source

3. The cyclone concentrates the grit and separates the organics from the grit. Grit Source

4. The Hydrogritter® II settles the grit, separating it from the water and sends it to a dumpster for disposal. Grit Source

5. For automatic operation and to decrease operating costs, the grit pump and Hydrogritter® II are cycled on and off by a control panel. Grit Source

Benefits of a Hydrogritter® II system

Benefits Automatic grit removal Low maintenance Decreases maintenance man-hours All downstream equipment lasts longer due to less grit wear Low maintenance Replace oil every year Regrease bearings every 6 months Visual inspection every month A single source for all components (Hydrogritter®, pump, and control panel) One PO Single source responsibility Each component specifically designed to work together

Benefits Proven grit removal technology Low capital cost Original Hydrogritter® designed over 70 years ago CAVEX® cyclones used in thousands of installations worldwide Manufacturer of the original recessed impeller pump WEMCO® Torque-Flow® pumps Low capital cost Low operating cost

Hydrogritter® II and pump sizing

Hydrogritter® II Capacity One (1) CAVEX® cyclone sized for 250 gpm @ 10 psi pressure drop Effective flow rates: 200 – 350 gpm @ 5 – 15 psi pressure drop Even if the elevations or calculated head are off by up to 10 feet (28% of total head), the cyclone will still perform Can be mounted at either the grit discharge or classifier overflow end Captures at least 95% of grit sized 150 mesh and larger with a specific gravity of 2.65 or greater One (1) grit classifier Cyclone feeds the grit classifier at a flow rate of 11 gpm Classifier is sized to handle a maximum cyclone feed of 20 gpm Service factor of 1.8 on the cyclone feed flow rate

Pump Capacity Sized for 250 gpm @ 35’ TDH. This allows for: 4 ft. of vertical head between the pump suction and the inlet of the cyclone. 10 psi pressure drop through the cyclone (23.1 ft.). 1 ft. of friction loss in the piping. Up to 7 ft. of lift between the surface of the water and the pump suction. Motors are sized to be non-overloading throughout the entire pump curve. No need to worry about the motor overloading at any flow rate. 3” suction and discharge allows for high velocities to suspend and carry settled grit.

WSP™ Self Primer grit pump option Non-overloading 7.5 HP motor

WEMCO® Torque-Flow® submersible grit pump option Non-overloading 9.2 HP motor

System Capacity Up to 2 MGD plant flow rate Capable of processing up to 13 cubic yards of grit per day Calculated maximum grit flow of a 2 MGD plant is only 1.5 cubic yards of grit per day For sizing of larger treatment plants, please contact your local representative

Package includes

Hydrogritter® II One (1) CAVEX® cyclone Made with a dough molded compound casing and natural gum rubber liners Can be mounted at either the grit discharge end or the classifier flow end One (1) Hydrogritter® II grit classifier ¾ HP direct connected drive motor with cycloidal speed reducer Hazardous location motor available Emergency stop cable running around outside of tank ¼” thick steel tank and supports Stainless steel adder available Kydex® tank covers NEMA 4X brass sluice water solenoid and E-stop cable NEMA 7 hazardous location adder available

Hydrogritter® II

Control Panel Stainless steel NEMA 4X enclosure Main circuit breaker Custom enclosure materials and NEMA designations available Main circuit breaker Starters and HOA switches for each motor Alarm horn and beacon Output contacts for remote alarm indication Designed to control (1) pump and (1) Hydrogritter® II Alternating controls for additional pumps available

WSP™ 3” Self-Primer pump Grit Pump: Option A WSP™ 3” Self-Primer pump Ductile iron case High chrome impeller and seal plate Hard iron impeller wear plate 7.5 HP TEFC severe duty motor Hazardous location motor adder available Belt driven base plate with constant speed belts and sheaves Silicon carbide seal faces Standard package includes (1) pump Second (standby) pump adder available

WEMCO® Torque-Flow® Model CE submersible pump Grit Pump: Option B WEMCO® Torque-Flow® Model CE submersible pump 3” suction and discharge flanges High chrome iron wetted parts 9.2 HP EEXO6 Hidrostal® immersible motor Capable of running continuously in air or submerged Includes 50’ of power and control cable Tungsten carbide / silicon carbide outer seal faces Standard package includes (1) pump Second (standby) pump adder available