In these slides we cover: • What a trash raking system is • Questions to ask a trash rake supplier about equipment, installation and operation • How to select the best trash raking system http://www.atlaspolar.com/trash-rake/

1. 7 Things to Know
Before Purchasing a
Trash Raking System

2. What We Are Going To Cover
• What a trash raking system is
• Questions to ask a trash rake supplier about
equipment, installation and operation
• How to select the best trash raking system

3. What is a Trash Raking System?
• Automates cleaning facilities for plants using large water volume
• Removes debris that escapes water screens
• Prevents damage caused by debris to turbines or pumping stations
• Increases efficiency
• Safer system for employees
• Replaces manual cleaning of racks

4. How Was Manual Cleaning Performed?
• Used a winch and cable system dropped to bottom of
rack then winched up
• Atlas Polar developed system to do job automatically
‣ Removes health and safety problems
‣ Increases efficiency
‣ Works 24/7

5. What Questions Are Asked of New Clients
Interested in Trash Raking System?
• Get a feel for what client has at plant
• Size of intake
‣ Atlas Polar equipment can handle any length
of intake
‣ Multiple units may be required for larger plants
• Depth of intake
‣ Multiple units for different depths
‣ Different strength booms

6. What Questions Are Asked of New Clients
Interested in Trash Raking System?
• Rack angle
‣ Equipment set to run parallel with racks
‣ Important for unit efficiency
• Photos required
‣ For visual of facility
• Debris type and weight
‣ Variety of models suited for specific types of debris
• Water flow

7. How is Water Flow Important?
• Use solid boom with attached rake head into water up to
depths of 70 feet
• Water velocity creates large force against boom
• Use high, tense style steel for force resistance
• Important to have right equipment based on site conditions
• Size important for longevity of equipment
• Expected to perform for minimum of 25 years

8. What Are Some of the
Different Types of Debris?
• Depending on location
‣ Logs
‣ Leaves
‣ Sea grass
• Adjust rake head according to debris
type increases dumping action
• Modifications for efficiency relative
to debris

9. What Type of Facility Would
Use a Trash Raking System?
• Any facility that uses high volumes of water
‣ Irrigation
‣ Hydro electric plants
‣ Pumping stations
‣ Waste water treatment systems
• Any facility that requires fresh clean water
• Debris needs to be removed and screens cleaned

10. Questions Facility Should Ask To
Determine Best System for Them
• Experience of supplier
• Credibility of equipment in field
• How equipment is operated
‣ Atlas Polar offers manual and automated
equipment
• Level of automation
• Methods of starting equipment

11. Questions Facility Should Ask To
Determine Best System for Them
• Cycle time efficiency
• Number of units required
• Capability during different seasons
• How debris is handled either by operator
or conveyance system
• Does unit hold debris after collection

12. Example of Hydro Facility
Requiring Trash Raking System
• Wants to know where equipment
has been used
• How long in operation

13. Example of Hydro Facility
Requiring Trash Raking System
• Atlas Polar introduced first trash raking system 30 years ago
‣ Telescopic boom type
‣ Modifications over years based on customer feed back
‣ Design continued to improve
‣ Has 400+ installations in USA
‣ Compatible for all climate conditions found in North America
‣ Installations in coastal salt water
‣ Performs well in temperature fluctuations of different locations
‣ High altitude climates, no problem
‣ Handles all debris types

14. What Models are Available for a
Hydro Electric Facility?
• Two models applicable for majority of hydro electric plants
‣ Single boom model uses high tensile 4x4 steel boom
‣ Single, double, triple stage boom for different depths
‣ Height clearance requirements
‣ Can move 1,500 pounds
‣ Handles 36 feet rake travel depth
‣ Ideal for run of the river hydro plants generating 2-10
megawatts electricity with water depth 15-25 feet

15. What Models are Available for a
Hydro Electric Facility?
‣ DT9300 double boom system
‣ Increased lifting capacity
‣ Can move 4,000 pounds of lift
‣ Widened rake lift to 6ft for large
log and heavy debris removal
‣ Increased depth to 70 feet
‣ Ideal for plants generating 10-50
megawatts with water depth
55-60 feet

16. What is the level of automation
a Purchaser Should Look For?
• Atlas Polar has focused on
‣ New technology and upgrades
‣ Focused on customer needs
• Customers require automation
‣ Can be done with timer
‣ Calendar scheduling

17. What is the level of automation
a Purchaser Should Look For?
• Most efficient is level differential measures water pressure
on one side of racks and compared to other side
‣ Indicates amount of debris in screen
‣ Built in sensors alert plant operator cleaning is required
‣ Single is triggered to automatically clean intake

18. What Questions Should Be Asked
About Control Mechanisms?
• How much operator involvement is required
• Some equipment on market requires full operator attention
• Other types fully automated no operator involvement
• Some types run semi automatic with some operator
involvement required
• Need to determine
‣ If operator is available
‣ Or requires full automation

19. What Questions Should Be Asked
About Hydraulic System?
• Want to know you have hydraulic in water
‣ Spill and leaks could be a concern
‣ System should be outside of water
‣ Should have spill containment plan
within system
• What kind of hydraulic oil is required
‣ Should be bio degradable
• Should have safety system

20. How Does Client Know What
Lift Capacity They Will Need?
• Need to rely on supplier experience based
on location and water flow
• Supplier based knowledge on similar
facilities and environment

21. How Important is Cycle Time?
• Peak season most important time
• One system should handle all seasons for depth and width
requirements
• Heavy peak periods may require multiple units on intake
• Determine number of times each section of intake is raked
• How fast is build-up occurring
• Key is to maintain efficiency and maximize water flow
• Cycle time determines time needed for cleaning intakes

22. What Happens When System Can’t
Handle Debris in Peak Season?
• Determine if possible to operate two or
more systems at same time
• Must be able to maintain water through
racks at all times
• Have options to add more units if
necessary

23. What Happens to the Raked Debris?
• Multiple options to handle debris
‣ Conveyance systems
‣ Depends on state regulations
‣ Dispose at composting facility
• Some options include rake holds debris to dispose of in bins
‣ Creates down times for rakes
• Debris left on decks for manual removal
• Conveyance best option for increased cycle time allows more options

24. More Information
• Please go to:
www.atlaspolar.com/trash-rake/