1. Precision AirConvey Internal Duct Cleaning System December 10, 2007 Sean Darras Nick Rakov Katie Sear Lindsay Martz

2. Introduction to PAC PAC has designed a pneumatic linen-refuse system.

3. Mock System

4. Project Scope UD must develop a method to clean PAC’s Linen and Refuse Removal System An inhibitor and deodorizer application must be developed

5. System Specifications/Constraints Duct Dimensions: ◦ Outside Diameter: 20” ◦ Thickness: Corners.135”, Straightaway.105” Access panels are 40-100 ft apart Pressure drop is 50 lbf/in 2 Air flow is 55 ft/s ~ 60 mph Duct is made of (uncoated) steel Plaque is caused by liquid/debris in the system Most ‘Plaque’ builds up on the turns Bag path can include a double 90 degree turn System cleaned weekly

6. Design Criteria WantMetricTarget Value Maximize Cleaning Performance Plaque removal80-100% removed Durability# of uses or total miles traveled 3 to 5 runs without decreased performance Minimize TimeTime to clean one mile1 hour Maximize RangeDistance traveled at one time 1 mile Minimal Labor Involvement # of operators2 in-house maintenance men Inhibit and Deodorize Quarterly Swab TestDependent on Industry

7. Pre-existing Solutions Customer Opinion: ◦ No Umbilicals ◦ Requires Aggressive Cleaning ◦ Prefer Robot and Shuttle ideas Agitation DevicesRobots PIG

8. Concept Ideas ShuttleSpringSpinnerRocket Spider Rating Criteria: 1: Should surpass target value 0.5: Should easily reach target value 0.2: Will probably reach target value 0: Unknown Metric Importance (%)RocketSpiderShuttleSpinnerSpring Plaque Removal30110.2 1 Durability2510.20.5 0.2 Distance Traveled1411110.5 Time1411110.5 Liquid Coverage110000.20 # of Operators611110.5 Final Score%896952.554.752

9. Chosen Concept: Rocket Initial ConceptFinal Prototype

10. In the Duct Clearance between shuttle and inside duct walls approx = 2 inches Shuttle length greater than 20 in. to prevent yaw and pitch in the tube

11. Rocket- How it works Propelled by system Aluminum Frame Rotated by system Nylon Bristles

12. Brushes Stiff Nylon Fibers Channel is attached by brackets to main body ChannelBrushes

13. Rotor Variable fin pitch Variable number of fins

14. Liquid Application Prewash and Deodorizer Sponge ◦ Approximately 7 lbs (dry) ◦ Dimensions:  Height 21”  Diameter 19.8” Fogger Sponge

15. Prototyping Fabrication outsourced to local Machine Shop UD provided assembly instructions, detailed drawings, and fabrication support.

16. Objectives of Testing Determine : ◦ Durability ◦ Time to clean one mile ◦ Distance that can be traveled at one time ◦ Coverage of the prewash, inhibitor and deodorizer ◦ Cleaning technique that maximizes plaque removal

17. Maximum Cleaning Performance

18. Flat-Sheet Prewash Test Flat-Sheet Prewash Test Surface# of swipes Greased Lightening6 40910 ZEP9 Dry20+ Air Chalk3

19. Sponge Testing BEFOREAFTER

20. Rotation Testing

21. 36 degrees over 12 ft= ~1 Rotation per 120 ft 8 fins at 45 deg. gives maximum rotation

22. Final Verification Testing -Results agree with Flat-Sheet Prewash Test 90 Degree Rise

23. Conclusions Rocket needs to Rotate One Rotation/Foot Current Rocket only rotates ~1 Rotation per 120 ft With no rotation, Rocket would need 54 levels of brushes

24. Recommended Proposal Compromise : ◦ Double the amount of brushes ◦ Requires1/2 rotation/foot ◦ Increase rotor diameter ◦ Optimize fin design ◦ Clean more often

25. Total Cost to PAC MaterialAmountPrice Body 5052 Aluminum Sheet- 1/8"10 sq ft $2455 (Includes Labor) 5052 Aluminum Sheet- 1/16"10 sq ft Propeller 5052 Aluminum Sheet- 1/8"1 sq ft 3/8" x 3/8" 12 ft Brushes 2 Sets of Brushes $746.88 100 Brackets Fogger Flex-a-lite 2600$300 Sponge2 Sponges$120 Filet Knife$30 Plaque MaterialsSoda, Eggs, Milk, Fake Snow, Air Chalk$25 Participation CostOne time fee$5000 PAC’s TimeVaries per employee$4,230* Total $13,906.88 *Best estimate

26. Questions?

27. Supporting Material-Rotor