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

2. The problem

3. 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

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

5. the solution

6. 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

7. How does the Hydrogritter® II system work?

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

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

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

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

12. 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

13. Benefits of a Hydrogritter® II system

14. 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

15. 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

16. Hydrogritter® II and pump sizing

17. Hydrogritter® II Capacity
One (1) CAVEX® cyclone sized for psi pressure drop
Effective flow rates: 200 – – 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

18. 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.

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

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

21. 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

22. Package includes

23. 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

24. Hydrogritter® II

25. 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

26. 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

27. 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