Cryogenic Backup Systems and Safety in Ultra-Low Temperature Applications
This course prepares service technicians to install, maintain, and troubleshoot secondary cryogenic backup systems utilizing liquid nitrogen and liquid carbon dioxide within ultra-low temperature environments. Students examine the physical and thermodynamic behavior of cryogens, focusing on phase-change cooling, liquid-to-gas expansion ratios, and sensible versus latent heat exchange. Key operational competencies include servicing injection solenoids, plumbing vacuum-jacketed transfer lines, calibrating mechanical temperature-actuated valves, and interfacing auxiliary control modules with primary freezer electronics. Safety remains a central focus, addressing the prevention of cryogenic burns, catastrophic pressure buildup, and oxygen-depleted atmospheres through proper ventilation engineering and continuous atmospheric monitoring. Technicians gain the practical confidence needed to assess failed backup triggers, safely vent pressurized containment cylinders, and verify emergency injection integrity before payload viability is compromised. Through rigorous coursework, technicians master the mechanical safety standards required to protect both biological assets and laboratory personnel during critical cooling system interruptions.
InstructorJacob CalhounPrerequisites
Course outline
Lectures, virtual labs, and graded assignments — completed in your browser.
Syllabus
["Week 1: Lesson 1: Physics and Thermodynamic Properties of Liquid Nitrogen and Liquid Carbon Dioxide", "Week 2: Lesson 2: Cryogenic Hazards, Personal Protective Equipment, and Cold-Burn First Aid", "Week 3: Lesson 3: Gas Expansion Dynamics, Pressure Containment, and Relief Valve Mechanics", "Week 4: Hands-on Lab: Cryogenic Cylinder Handling, Line Hookup, and Pressure Relief Inspection", "Week 5: Lesson 5: Oxygen Depletion Hazards, Gas Detection Sensors, and Room Ventilation Standards", "Week 6: Lesson 6: Vacuum-Jacketed Piping, Flexible Transfer Lines, and Thermal Insulation Methods", "Week 7: Lesson 7: Cryogenic Solenoids, Injection Orifices, and Mechanical Metering Valves", "Week 8: Hands-on Lab: Disassembly, Rebuilding, and Leak Testing of Cryogenic Injection Manifolds", "Week 9: Lesson 9: Backup Control Modules, Power Loss Detection, and Standby Battery Maintenance", "Week 10: Lesson 10: Engineering Trade-Offs and Cabinet Sizing: Liquid Nitrogen versus Liquid Carbon Dioxide", "Week 11: Hands-on Lab: Simulating Primary Cascade Failure and Verifying Backup Temperature Cut-Ins", "Week 12: Lesson 12: Cabinet Exhaust Venting, Air Exchange, and Ice Dam Mitigation", "Week 13: Lesson 13: Preventive Maintenance Protocols, Cylinder Rotation, and Decommissioning Procedures", "Week 14: Capstone Service Project: Comprehensive Backup System Retrofit, Commissioning, and Safety Audit"]