1. FINAL PRESENTATION P13681

2. The Team Austin Frazer Role: Lead Engineer - Analysis Major: Mechanical Engineering Eileen Kobal Role: Lead Engineer – Mixtures of Gas Fluids Major: Chemical Engineering Ana Maria Maldonado Role: Team Manager Major: Industrial Engineering Marie Rohrbaugh Role: Project Manager Major: Mechanical Engineering 2

3. Concept Summary To mass spectrometer Valve High pressure helium Fixturing/leakage similar to other side Fixtures interface between AGT can and valve Fixture leakage Valve leakage Leakage from valve Leakage from Fixture Leakage from room through lid and baseplate 3 Moog’s Problem Statement:

4. Concept Summary Continued Moog’s current means of fixture leakage reduction: Vented Double O-ring 4 3000 psi Valve 0 psi (Vacuum) Vent open to ambient. Leakage past 1 st O- Ring is meant to dissipate out of can MSD team is able to modify vent conditions

5. Concept Summary Continued 5 Moog already has “constant N2 flow” subsystem implemented on bottom large O-ring Similar subsystem could be applied to top large O-ring This was listed as lower priority Constant N2 flow during test Moog’s current means of fixture leakage reduction: Large O-rings

6. Customer Specifications and Requirements 6 Ranking Voice of the Customer to Voice of the Engineer Numbers represent how well the engineering specification meets the customer requirement. The Ranking describes how important the customer need is.

7. Project Overview 7

8. Simulink Model System was modeled in Simulink to help select a concept Only vented double O-ring was modeled. Not large O-rings Model was built with a perfectly mixed assumption. This would prove to be a poor assumption Results of the Simulation indicated that a pulse-purge vent condition would most drastically reduce the fixture leakage. This was the basis for the system design of MSD I 8

9. Initial Project Design – End of MSD I 9 Permanent Subsystem Required: Modification of baseplate Robust Labview programming by Moog supplier System was required to operate independent of operator input Multiple circle seal valves Robust and space - efficient mounting of all required components Hardlines capable of safely handling high pressures Cost: Approximately $7,500 per AGT The initial design (per the detailed design review) was intended to be a permanent system. Due to budget cuts this was eliminated as a viable concept Design accounts for large O-ring and vented double O-ring leakage

10. Initial Project Design Continued 10 High Pressure Inlet All vents connected to one system Modifications to baseplate necessary Access port to Vent

11. Initial Project Design - Continued 11

12. Actual System Design – Portable System Due to budget cuts, a portable “proof of concept” system was created to test the validity of the pulse purge vented double O-ring Most design criteria from MSD I remained intact. Changes include Valves, regulators, electrical components donated by Moog All parts machined and assembled by the MSD team Electrical subsystem to control valve(s) to be designed/implemented by MSD team Operator input into system OK 12

13. Actual System Design - Schematic 13

14. Actual Project Design – Portable System 14 Tube represents valve. Typically the Fixture system is on both the inlet and outlet of the valve. High Pressure Helium into Fixture System Vented Helium Seals have two o- rings with a vent between. Gas moves freely between the seals. Helium Leakage from Fixture Welded to minimize leakage

15. 15 Bill of Materials Total cost ~$1000 Total cost after donated/borrowed items ~$40

16. System Architecture 16 Flexline goes to next slide

17. System Architecture Continued 17 Helium Inlet Vent Port

18. Results 4 hours of continuous leakage data was acquired under varying vent conditions. Sample plot is given below: 18

19. Results Continued 19 Duty cycle varies within this plot. No correlation between duty cycle and leakage rate* Proves to increase fixture leakage (as expected) *It is concluded that the N2 pulse actually pushes the Helium out of the vent. Uniform mixing does not occur Not strong enough correlation to draw conclusions (see order of magnitude) Analysis of the test data produces the following plots:

20. Results Continued 20 Constant N2 flow around large O- rings significantly reduces fixture leakage 1 sec of pressure followed by 50 sec of vacuum Cycled 14 times 14 peaks

21. Conclusions Proof-of-concept design was successfully designed and assembled. Reliable test data was collected Test data indicates that pulsing/purging the vented double O-ring volume does not reduce fixture leakage adequately Test data indicates that constant flow of N2 past the lower large O-ring significantly reduces leakage results A constant flow through the vent is expected to significantly reduce fixture leakage Project output is consistent with current Moog priorities Data was collected and the concept was tested. Relatively few un- returnable company resources were used. A conclusive answer has been acquired 21

22. Our Recommendation Do not pursue pulse purge vent condition If modifying selected fixturing was a possibility, allowing a constant flow through the vent is expected to significantly reduce fixture leakage Implement the constant N2 flow system on the upper large O-ring Designs have already been completed for the modification of the can and manufacturing of addition required components 22

23. MSD II Schedule 23 We finished on time!!!

24. Acknowledgements Robert Bauer & Moog Space and Defense Group Michael Zona Dr. Jason Koldziej Dr. Karuna Koppula Dr. Elizabeth DeBartolo Prof. John Wellin 24

25. QUESTIONS? Thank you for coming! 25