1. 1 | Program Name or Ancillary Texteere.energy.gov Water Power Peer Review The Development of Open, Water-Lubricated Polycrystalline Diamond Thrust Bearings for Use in Marine Hydrokinetic (MHK) Energy Machines Craig Cooley US Synthetic / Bearings ccooley@ussynthetic.com Sept. 27, 2011

2. 2 | Wind and Water Power Programeere.energy.gov Purpose, Objectives, & Integration Purpose: Evaluate the use of Polycrystalline Diamond (PCD) Bearings for use in the moving components of MHK energy machines Motivation: Reduce operating costs and preserve the marine environment from oil based lubricant contamination PCD bearings are known to operate effectively in abrasive and high load situations for thousands of hours in oil and gas drilling tools Knowledge gap: Do diamond bearings currently have or can they be designed to have the necessary life to work for 5 years in an MHK machine?

3. 3 | Wind and Water Power Programeere.energy.gov Technical Approach Approach: Conduct three design, build and test iterations to arrive at final design for life testing, and provide bearings for field evaluation Bearing design methodology: Consultation from Professor Michael Khonsari, LSU Experience and methods used to design bearings for oil and gas tools Laboratory testing and evaluation: Using US Synthetic’s bearing test facility Simulating MHK application by using water as the lubricant and appropriate test parameters Conduct friction, life, and destructive tests in the laboratory Prepare prototype bearings for full-scale tests Key issue: Achieving design balance between low friction (bearing hydrodynamic performance) and ability to transfer heat out of the bearing (mixed mode bearing performance) s

4. 4 | Wind and Water Power Programeere.energy.gov Technical Approach Provided there is time, this side and the following two slides may be used by the principal investigator to explain project results. Below are examples of the bearing geometries tested.

5. 5 | Wind and Water Power Programeere.energy.gov Technical Approach Example of a single bearing set’s hydrodynamic performance:

6. 6 | Wind and Water Power Programeere.energy.gov Technical Approach Failure data for several bearing types:

7. 7 | Wind and Water Power Programeere.energy.gov Plan, Schedule, & Budget Schedule: Initiation date: 09/01/10 Planned completion date: 02/29/12 Currently on schedule gr Green = complete, yellow = in progress, gray = planned

8. 8 | Wind and Water Power Programeere.energy.gov Plan, Schedule, & Budget Budget: Of our planned budget for the first 3 quarters we are only over $527. Of the $146,984 that we have budged for the DOE share for this entire project, we have budgeted $84,397 for the first 3 quarters of 2011. Of that $84,397 we have spent $84,924 for a difference of $527. Budget History FY2010FY2011FY2012 DOECost-shareDOECost-shareDOECost-share $0.00 $119,397.00$36,003.00$27,587.00$9,000.00