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Maintaining Mission Critical Systems in a 24/7 Environment

IEEE Press Series on Power and Energy Systems 3. Aufl.

von: Peter M. Curtis
117,99 €
Verlag:	Wiley
Format:	EPUB
Veröffentl.:	12.12.2020
ISBN/EAN:	9781119506140
Sprache:	englisch
Anzahl Seiten:	656

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Titelbeschreibung

The new edition of the leading single-volume resource on designing, operating, and managing mission critical infrastructure Maintaining Mission Critical Systems in a 24/7 Environment provides in-depth coverage of operating, managing, and maintaining power quality and emergency power systems in mission critical facilities. This extensively revised third edition provides invaluable insight into the mission critical environment, helping professionals and students alike understand how to sustain continuous functionality, minimize the occurrence of costly unexpected downtime, and guard against power disturbances that can damage any organization's daily operations. Bridging engineering, operations, technology, and training, this comprehensive volume covers each component of specialized systems used in mission critical infrastructures worldwide. Throughout the text, readers are provided the up-to-date information necessary to design and analyze mission critical systems, reduce risk, comply with current policies and regulations, and maintain an appropriate level of reliability based on a facility's risk tolerance. Topics include safety, fire protection, energy security, and the myriad challenges and issues facing industry engineers today. Emphasizing business resiliency, data center efficiency, cyber security, and green power technology, this important volume: <ul> <li>Features new and updated content throughout, including new chapters on energy security and on integrating cleaner and more efficient energy into mission critical applications</li> <li>Defines power quality terminology and explains the causes and effects of power disturbances</li> <li>Provides in-depth explanations of each component of mission critical systems, including standby generators, raised access floors, automatic transfer switches, uninterruptible power supplies, and data center cooling and fuel systems</li> <li>Contains in-depth discussion of the evolution and future of the mission critical facilities industry</li> <li>Includes PowerPoint presentations with voiceovers and a digital/video library of information relevant to the mission critical industry</li> </ul> Maintaining Mission Critical Systems in a 24/7 Environment is a must-read reference and training guide for architects, property managers, building engineers, IT professionals, data center personnel, electrical & mechanical technicians, students, and others involved with all types of mission critical equipment.

Inhaltsverzeichnis

Foreword xvii Preface xxi Acknowledgments xxiii 1 An Overview of Reliability and Resiliency in Today’s Mission Critical Environment 1 1.1 Introduction 1 1.2 Risk Assessment 5 1.2.1 Levels of Risk 6 1.3 Capital Costs versus Operation Costs 7 1.4 Critical Environment Workflow and Change Management 9 1.4.1 Change Management 10 1.5 Testing and Commissioning 11 1.6 Documentation and Human Factor 16 1.7 Education and Training 20 1.8 Corporate Knowledge Transfer – the Means to Securing Tomorrow’s Critical Infrastructure 21 1.9 Operation and Maintenance 24 1.10 Employee Certification 25 1.11 Standards and Benchmarking 25 1.12 What is a Mission Critical Engineer 26 1.13 Conclusion 28 1.14 An Overview of Reliability and Resiliency in Today’s Mission Critical Environment - Questions to Consider 28 2 Energy and Cyber Security and its Effect on Business Resiliency 31 2.1 Introduction 31 2.2 Risks Related to Information Security 36 2.3 Electro Magnetic Pulse and Solar Flares 42 2.4 How Risks Are Addressed 47 2.5 Use of Distributed Energy Resources and Generation 52 2.6 Documentation and Its Relation to Information Security 55 2.7 Smart Grid 57 2.8 Conclusion 60 2.9 Energy Security and Its Effect on Business Resiliency – Questions to Consider 60 3 Mission Critical Engineering with an Overview of Green Technologies 63 3.1 Introduction 63 3.2 Companies’ Expectations: Risk Tolerance and Reliability 65 3.3 Identifying the Appropriate Redundancy in a Mission Critical Facility 67 3.4 Improving Reliability, Maintainability, and Proactive Preventative Maintenance 69 3.5 The Mission Critical Facilities Manager and the Importance of the Boardroom 71 3.6 Quantifying Reliability and Availability 71 3.6.1 Review of Reliability Terminology 72 3.7 Design Considerations for the Mission Critical Data Center 73 3.7.1 Data Center Certification 74 3.8 The Evolution of Mission Critical Facility Design 76 3.9 Human Factors and the Commissioning Process 77 3.10 Short Circuit & Coordination Studies 79 3.11 Introduction to Direct Current in the Data Center 84 3.11.1 Advantages of DC Distribution 85 3.11.2 Lighting Updates 87 3.11.3 DC Storage Options 87 3.11.4 Renewable Energy Integration 88 3.11.5 DC and Combined Cooling, Heat & Power 89 3.11.6 Safety Issues 91 3.11.7 Maintenance 91 3.11.8 Education & Training 92 3.11.9 Future Vision 93 3.12 Containerized Systems Overview 93 3.13 Mission Critical Engineering with an Overview of Green Technologies - Questions to Consider 95 4 Mission Critical Electrical System Maintenance & Safety 103 4.1 Introduction 103 4.2 The History of the Maintenance Supervisor and the Evolution of the Mission Critical Facilities Engineer 105 4.3 Internal Building Deficiencies and Analysis 107 4.4 Evaluating Your System 108 4.5 Choosing a Maintenance Approach 110 4.5.1 Annual Preventive Maintenance 111 4.6 Safe Electrical Maintenance 112 4.6.1 Standards and Regulations 112 4.6.2 Electrical Safety: NFPA 70E Arc Flash Mitigation 114 4.6.3 Personal Protective Equipment (PPE) 117 4.6.4 Lockout/Tagout 126 4.7 Maintenance of Typical Electrical Distribution Equipment 127 4.7.1 Thermal Scanning and Thermal Monitoring 127 4.7.2 15 KV Class Equipment 129 4.7.3 480 Volt Switchgear 130 4.7.4 Motor Control Centers and Panel Boards 131 4.7.5 Automatic Transfer Switches 131 4.7.6 Automatic Static Transfer Switches (ASTS) 132 4.7.7 Power Distribution Units 132 4.7.8 277/480 Volt Transformers 133 4.7.9 Uninterruptible Power Systems 133 4.8 Being Proactive in Evaluating the Test Reports 134 4.9 Designing for Safety and Reliability 135 4.10 Conclusion 136 5 Standby Generators 137 5.1 Introduction 137 5.2 The Necessity for Standby Power 138 5.3 Emergency, Legally Required, and Optional Systems 140 5.4 Standby Systems That Are Legally Required 141 5.5 Optional Standby Systems 142 5.6 Understanding Your Power Requirements 142 5.7 Management Commitment and Training 142 5.7.1 Lockout/ Tagout (LOTO) 143 5.7.2 Training 144 5.8 Standby Generator Systems Maintenance Procedures 144 5.8.1 Maintenance Record Keeping and Data Trending 145 5.8.2 Engine 145 5.8.3 Coolant System 145 5.8.4 Electrical / Control System 146 5.8.5 Generator 146 5.8.6 Automatic and Manual Switchgear 147 5.8.7 Load Bank Testing 147 5.9 Documentation Plan 148 5.9.1 Proper Documentation and Forms 148 5.9.2 Record keeping 148 5.10 Emergency Procedures 149 5.11 Cold Start 150 5.12 Non-Linear Load Concerns 151 5.12.1 Line Notches and Harmonic Current 151 5.12.2 Voltage / Frequency Drop 152 5.12.3 Voltage / Frequency Rise 152 5.12.4 Frequency Fluctuation 153 5.12.5 Synchronizing to Parallel 154 5.12.6 Automatic Transfer Switch 154 5.13 Conclusion 155 6 Fuel Systems Design and Maintenance 157 6.1 Introduction 157 6.2 Brief Discussion on Diesel Engines 158 6.3 Bulk Storage Tank Selection 159 6.3.1 Aboveground Tanks 159 6.3.2 Modern Underground Tanks and Piping Systems 160 6.3.3 Fuel Receiving Tanks 161 6.3.4 Generator Sub-Base Tanks 161 6.4 Codes and Standards 162 6.5 Recommended Practices for all Tanks 163 6.6 Fuel Distribution System Configuration 168 6.7 Day Tank Control System 170 6.8 Diesel Fuel and a Fuel Quality Assurance Program 174 6.9 Conclusion 186 7 Power Transfer Switch Technology, Applications, and Maintenance 187 7.1 Introduction 187 7.2 Transfer Switch Technology and Applications 189 7.3 Types of Power Transfer Switches 191 7.3.1 Manual Transfer Switches 191 7.3.2 Automatic Transfer Switches 191 7.4 Control Devices 204 7.4.1 Time Delays 204 7.4.2 In-Phase Monitor 205 7.4.3 Test Switches 206 7.4.4 Exercise Clock 207 7.4.5 Current, Voltage and Frequency Sensing 207 7.5 Design Features 207 7.5.1 Close Against High In-Rush Currents 208 7.5.2 Withstand and Closing Rating (WCR) 208 7.5.3 Carry Full Rated Current Continuously 208 7.5.4 Interrupt Current 209 7.6 Additional Characteristics and Ratings of ATS 209 7.6.1 NEMA Classification 209 7.6.2 System Voltage Ratings 209 7.6.3 ATS Sizing 209 7.6.4 Seismic Requirement 210 7.7 Installation & Commissioning, Maintenance, and Safety 210 7.7.1 Installation & Commissioning 210 7.7.2 Maintenance & Safety 212 7.7.3 Maintenance Tasks 214 7.7.4 Drawings and Manuals 215 7.7.5 Testing & Training 215 7.8 General Recommendations 218 7.9 Conclusion 219 8 The Static Transfer Switch 221 8.1 Introduction 221 8.2 Overview 222 8.2.1 Major Components 222 8.3 Typical Static Switch One Line 223 8.3.1 Normal Operation 223 8.3.2 Bypass Operation 224 8.3.3 STS and STS/transformer Configurations 225 8.4 STS Technology and Application 225 8.4.1 General Parameters 225 8.4.2 STS Location and Type 226 8.4.3 Advantages and Disadvantages of the Primary and Secondary STS/Transformer Systems 226 8.4.4 Monitoring, Data Logging, and Data Management 227 8.4.5 Downstream Device Monitoring 227 8.4.6 STS Remote Communication 228 8.4.7 Security 228 8.4.8 Human Engineering and Eliminating Human Errors 229 8.4.9 Reliability and Availability 230 8.4.10 Repairability and Maintainability 231 8.4.11 Fault Tolerance and Abnormal Operation 232 8.5 Testing 232 8.6 Conclusion 233 9 The Fundamentals of Power Quality 235 9.1 Introduction 235 9.2 Electricity Basics 237 9.2.1 Basic Circuit 238 9.2.2 Power Factor 238 9.3 Transmission of Power 241 9.3.1 Life Cycle of Electricity 241 9.3.2 Single-Phase and Three-Phase Power Basics 243 9.3.3 Unreliable Power versus Reliable Power 245 9.4 Understanding Power Problems 245 9.4.1 Power Quality Standards 246 9.4.2 Power Quality Transients 249 9.4.3 RMS Variations 250 9.4.4 Causes of Power Line Disturbances 255 9.4.5 Power Line Disturbance Levels 261 9.5 Tolerances of Critical Loads 261 9.5.1 CBEMA Curve 263 9.5.2 ITIC Curve 263 9.5.3 Purpose of Curves 265 9.6 Power Monitoring 265 9.7 The Impact of Alternative Energy Generation 268 9.8 Conclusion 269 10 UPS Systems: Applications and Maintenance with an Overview of Green Technologies 273 10.1 Introduction 273 10.1.1 Green and Reliability Overview 273 10.2 Purpose of UPS Systems 275 10.3 General Description of UPS Systems 279 10.3.1 What is a UPS system? 279 10.3.2 How does a UPS system work? 279 10.3.3 Static UPS Systems 280 10.3.4 Online 281 10.3.5 Double Conversion 282 10.3.6 Double Conversion UPS Power Path 282 10.4 Components of a Static UPS System 284 10.4.1 Power Control Devices 284 10.5 Online - Line Interactive UPS Systems 291 10.6 Offline (Standby) 292 10.7 The Evolution of Static UPS Technology 293 10.7.1 Emergence of the IGBT 293 10.7.2 Two and Three-Level Rectifier/Inverter Topology 294 10.7.3 Silicon Carbide Replaces Silicon as UPS Semiconductor of Electricity 295 10.8 Rotary UPS Systems 299 10.8.1 UPSs Using Diesel 300 10.8.2 Hybrid UPS Systems 301 10.9 Redundancy, Configurations, and Topology 301 10.9.1 N 302 10.9.2 N+1 302 10.9.3 Isolated Redundant 303 10.9.4 N+2 303 10.9.5 2N 304 10.9.6 2(N+1) 305 10.9.7 Distributed Redundant / Catcher UPS 305 10.9.8 “Eco-Mode” for Static UPS 306 10.9.9 Availability Calculations 307 10.10 Energy Storage Devices 308 10.10.1 Battery 308 10.10.2 Flywheel Energy 314 10.11 UPS Maintenance & Testing 316 10.11.1 Physical Preventive Maintenance (PM) 318 10.11.2 Protection Settings, Calibration, and Guidelines 318 10.11.3 Functional Load Testing 319 10.11.4 Steady State Load Test 319 10.11.5 Steady State Load Test at 0%, 50% and 100% load: 320 10.11.6 Harmonic Analysis and Testing 320 10.11.7 Filter Integrity and Testing 321 10.11.8 Transient Response Load Test 322 10.11.9 Module Fault Test 322 10.11.10 Battery Run Down Test 322 10.12 Static UPS and Maintenance 323 10.12.1 Examples of Semi-Annual Checks and Services for UPS Systems 324 10.13 UPS Management 324 10.14 Conclusion 325 11 Data Center Cooling Systems 327 11.1 Introduction 327 11.2 Background Information 330 11.3 Cooling within Datacom Rooms 331 11.4 Cooling Process 332 11.4.1 Cooling Process in Datacom Space 332 11.4.2 Direct Expansion (DX) Systems 333 11.4.3 Chilled Water Systems 334 11.5 Cooling Final Dissipation 334 11.5.1 Air Cooled System 335 11.5.2 Water Side 335 11.6 The Refrigeration Process 337 11.6.1 Refrigeration Equipment – Compressors 337 11.6.2 Refrigeration Equipment – Chillers 338 11.6.3 Heat Rejection Equipment 342 11.6.4 Energy Recovery Equipment 353 11.6.5 Heat Exchangers 360 11.7 Components Inside Datacom Room 363 11.7.1 Computer Room Cooling Units 363 11.8 Conclusion 373 12 Data Center Cooling Efficiency, Concepts, & Technologies 375 12.1 Introduction 375 12.2 Heat Transfer Inside Data Centers 379 12.2.1 Heat Generation 379 12.2.2 Heat Return 380 12.2.3 Cooling Air 380 12.3 Cooling and Other Airflow Topics 381 12.3.1 Leakage 381 12.3.2 Mixing and its Relationship to Efficiency 382 12.3.3 Re-circulation 382 12.3.4 Venturi Effect 382 12.3.5 Vortex Effect 383 12.3.6 CRAC/CRAH Types 383 12.3.7 Potential CRAC Operation Issues 383 12.3.8 Sensible vs. Latent Cooling 384 12.3.9 Humidity Control 386 12.3.10 CRAC Fighting / Too Many CRACs 387 12.4 Design Approaches for Data Center Cooling 388 12.4.1 Hot Aisle/Cold Aisle 388 12.4.2 Cold Aisle Containment 388 12.4.3 In-Row Cooling with Hot Aisle Containment 388 12.4.4 Overhead Supplemental Cooling 389 12.4.5 Chimney or Ducted Returns 389 12.4.6 Advanced Active Airflow Management for Server Cabinets 390 12.5 Additional Considerations 390 12.5.1 Active Air Movement 390 12.5.2 Adaptive Capacity 390 12.5.3 Liquid Cooling 391 12.5.4 Cold Storage 392 12.6 Hardware & Associated Efficiencies 392 12.6.1 Server Efficiency 392 12.6.2 Server Virtualization 392 12.6.3 Multi-Core Processors 393 12.6.4 Blade Servers 393 12.6.5 Energy Efficient Servers 393 12.6.6 Power Managed Servers 393 12.6.7 Effect of Dynamic Server Loads on Cooling 393 12.7 Best Practices 394 12.8 Efficiency Problem Solving 394 12.9 Conclusion 396 12.10 Conversions, Formulas, Guidelines 396 13 Raised Access Floors 397 13.1 Introduction 397 13.1.1 What is an Access Floor? 397 13.1.2 What are the Typical Applications for Access Floors? 399 13.1.3 Why use an Access Floor? 399 13.2 Design Considerations 400 13.2.1 Determine the Structural Performance Required 400 13.2.2 Determine the Required Finished Floor Height 403 13.2.3 Determine the Understructure Support Design Type Required 404 13.2.4 Determine the Appropriate Floor Finish 405 13.2.5 Air Flow Requirements 406 13.3 Safety Concerns 409 13.3.1 Removal & Reinstallation of Panels 409 13.3.2 Removing Panels 409 13.3.3 Stringer Systems 411 13.3.4 Protection of the Floor from Heavy Loads 412 13.3.5 Grounding the Access Floor 417 13.3.6 Fire Protection 418 13.3.7 Zinc Whiskers 419 13.4 Panel Cutting (For all Steel Panels or Cement Filled Panels that do not Contain an Aggregate) 419 13.4.1 Safety Requirements for Cutting Panels 419 13.4.2 Guidelines for Cutting Panels 420 13.4.3 Cutout Locations in Panels; Supplemental Support for Cut Panels 420 13.4.4 Saws and Blades for Panel Cutting 420 13.4.5 Interior Cutout Procedure: 421 13.4.6 Round Cutout Procedure 421 13.4.7 Installing Protective Trim Around Cut Edges 421 13.4.8 Cutting and Installing the Trim 422 13.5 Access Floor Maintenance 423 13.5.1 Best Practices for Standard High Pressure Laminate Floor Tile (HPL) and for Vinyl Conductive & Static Dissipative Tile 423 13.5.2 Damp Mopping Procedure for HPL and Conductive & Static Dissipative Vinyl Tile 423 13.5.3 Cleaning the Floor Cavity 424 13.6 Troubleshooting 424 13.6.1 Making Pedestal Height Adjustments 425 13.6.2 Rocking Panel Condition 425 13.6.3 Panel Lipping Condition (Panel Sitting High) 425 13.6.4 Out-of-Square Stringer Grid (Twisted Grid) 426 13.6.5 Tipping at Perimeter Panels 427 13.6.6 Tight Floor or Loose Floor: Floor Systems Laminated with HPL Tile 427 13.7 Additional Design Considerations 428 13.7.1 LEED Certification 428 13.7.2 Energy Efficiency - Hot and Cold Air Containment 428 13.7.3 Airflow Distribution and CFD Analysis 429 13.8 Conclusion 437 14 Fire Protection in Mission Critical Infrastructures 439 14.1 Introduction 439 14.2 Hazard Analysis 441 14.3 Alarm and Notification 441 14.4 Early Warning Detection 444 14.4.1 Wireless Detection 445 14.5 Fire Suppression 445 14.5.1 Hybrid Fire Suppression Systems 448 14.5.2 Protecting Lithium Ion Batteries 449 14.6 Systems Design 450 14.6.1 Stages of a Fire 450 14.6.2 Fire and Building Codes 451 14.7 Fire Detection 452 14.8 Fire Suppression Systems 461 14.8.1 Water Mist Systems 467 14.8.2 Carbon Dioxide Systems 470 14.8.3 Clean Agent Systems 472 14.8.4 Inert Gas Agents 472 14.8.5 IG-541 473 14.8.6 IG-55 474 14.8.7 Chemical Clean Agents 474 14.8.8 Portable Fire Extinguishers 479 14.8.9 Clean Agents and the Environment 479 14.9 Conclusion 480 15 Managing Through Pandemics 481 15.1 Executive Summary: COVID-19’s Impact on Critical Infrastructure Globally 481 15.2 Architectural Solutions and Air Purification Systems 482 15.2.1 HVAC Systems 482 15.2.2 UV Technology 482 15.2.3 Bipolar Ionization 485 15.2.4 Copper Doorknobs 485 15.2.5 Architectural Improvements to be Considered 486 15.3 Building Equipment Solutions and Technology 487 15.3.1 Cleaning vs. Disinfecting vs. Sanitizing 487 15.3.2 Intensify Cleaning Frequency and Measures 487 15.3.3 IR Scans 488 15.3.4 Rethinking the flush, the sink, and the hand dryer 488 15.3.5 Technology 489 15.4 Operations, Maintenance and Training 491 15.4.1 Personal Protection 491 15.4.2 Change in Operation 491 15.4.3 Data Center Betterment Opportunities 492 15.5 Site Protection: Safeguarding the Staff and Visitors 493 15.6 The Workforce of Tomorrow 494 15.7 Assessment Tasks - HVAC and Air Handling Units Filter Upgrades 495 15.8 Managing Through Pandemics -Questions to Consider 496 15.9 Conclusion 497 Appendix A Policies and Regulations 499 A.1 Introduction 499 A.2 Industry Policies & Regulations 501 A.2.1 USA PATRIOT Act 503 A.2.2 Sarbanes-Oxley Act (SOX) 505 A.2.3 Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (also known as the Superfund Act) 506 A.2.4 Executive Order 13423: Strengthening Federal Environmental, Energy and Transportation Management 507 A.2.5 ISO27000 Information Security Management System (ISMS) 508 A.2.6 The National Strategy for the Physical Protection of Critical Infrastructures and Key Assets 513 A.2.7 2009 National Infrastructure Protection Plan 514 A.2.8 North American Electric Reliability Corporation (NERC) Critical Infrastructure Protection Program 514 A.2.9 U.S. Security & Exchange Commission (SEC) 516 A.2.10 Sound Practices to Strengthen the Resilience of the U.S. Financial System 516 A.2.11 C4I Command, Control, Communications, Computers, and Intelligence 517 A.2.12 Basel II Accord 519 A.2.13 National Institute of Standards and Technology (NIST) 519 A.2.14 Business Continuity Management Agencies and Regulating Organizations 521 A.2.15 FFIEC - Federal Financial Institutions Examination Council 523 A.2.16 National Fire Prevention Association 1600 – Standards on Disaster/Emergency Management and Business Continuity Programs 524 A.2.17 Private Sector Preparedness Act 525 A.3 Data Protection 526 A.4 Encryption 528 A.4.1 Protecting Critical Data through Security and Vaulting 529 A.5 Business Continuity Plan (BCP) 529 A.6 Conclusion 531 Appendix B Consolidated List of Key Questions 535 Appendix C Airflow Management (A System Approach) 553 C.1 Introduction 553 C.2 Control is the Key 555 C.3 Obtaining Control 558 C.4 Air Management Technologies 565 C.5 Conclusion 570 Glossary 573 References 595 Index 609

Autorenportrait

Peter M. Curtis is the Founder of PMC Group One, LLC. He is a graduate of the New York Institute of Technology with a Bachelor of Technology degree in Electro-Mechanical Computer Technology and a Master of Science degree in Energy Management. Mr. Curtis has decades of experience working in the Mission Critical Facilities Engineering industry in the areas of banking and finance, defense, electric and water utilities, energy management, and education. He has in-depth expertise in computer-integrated systems, online interface, and facilities operations-maintenance management.

Back cover copy

The new edition of the leading single-volume resource on designing, operating and managing mission critical infrastructures Maintaining Mission Critical Systems in a 24/7 Environment provides in-depth coverage of operating, managing, and maintaining mission critical facilities. This extensively revised third edition provides invaluable insight into the mission critical environment, helping professionals and students alike understand how to sustain continuous functionality, minimize the occurrence of costly unexpected downtime, and guard against human error that can negatively impact any organization's daily operations and balance sheet. Bridging engineering, operations, technology, and training, this comprehensive volume covers each component of specialized systems used in mission critical infrastructures worldwide. Throughout the text, readers are provided with the up-to-date information necessary to design and analyze mission critical systems, reduce risk, comply with current policies and regulations, and maintain an appropriate level of reliability based on a facility's risk tolerance. Topics include safety, fire protection, energy security, and the myriad challenges and issues facing industry engineers today. Emphasizing business resiliency, data center efficiency, cyber security, and green power technology, this essential volume: <ul> <li>Features new and updated content throughout, including new chapters on energy security, managing through pandemics, and on integrating cleaner and more efficient energy into mission critical applications</li> <li>Defines power quality terminology and explains the causes and effects of power disturbances</li> <li>Provides in-depth explanations of each component of mission critical systems, including standby generators, raised access floors, automatic transfer switches, uninterruptible power supplies, data center cooling and fuel systems</li> <li>Contains an in-depth discussion of the evolution and the future of the mission critical facilities industry</li> </ul> Maintaining Mission Critical Systems in a 24/7 Environment is a must-read reference and training guide for architects, property managers, building engineers, IT professionals, data center personnel, electrical & mechanical technicians, students, and others involved with all types of mission critical equipment.