VESDA
®
Refrigerated Storage Design Guide
Contents
1. Introduction.............................................................................................................................................. 1
1.1 About This Design Guide ................................................................................................................. 1
1.2 Quick Reference............................................................................................................................... 1
2. Background Information......................................................................................................................... 2
2.1 Fire Safety Considerations In Refrigerated Storage Facilities......................................................... 2
2.2 Performance-Based Design............................................................................................................. 3
2.3 Key Design Considerations.............................................................................................................. 3
2.4 Why Use VESDA Smoke Detection?............................................................................................... 4
3. Designing For Effective Fire Protection ................................................................................................ 4
3.1 Sample Pipe Material....................................................................................................................... 5
3.2 Positioning Pipes And Sample Holes............................................................................................... 5
3.3 Sample Pipe Insulation..................................................................................................................... 7
3.4 Sealing Sample Pipe Penetrations................................................................................................... 7
3.5 Compensating For Sample Pipe Contraction................................................................................... 8
3.6 In-rack Protection ............................................................................................................................. 9
3.7 Ceiling Void Protection..................................................................................................................... 9
3.8 Other Areas To Be Protected......................................................................................................... 10
4. Preventing Condensation And Crystallization.................................................................................... 10
4.1 The Effects Of A Temperature Drop .............................................................................................. 10
4.2 Condensation On The Sample Pipe Outer Surface....................................................................... 10
4.3 Crystallization On The Sample Pipe Outer Surface....................................................................... 11
4.4 Condensation Inside Sample Pipes............................................................................................... 11
4.5 Crystallization Inside Sample Pipes............................................................................................... 12
5. Installation Considerations................................................................................................................... 12
5.1 Sampled Air Warming .................................................................................................................... 12
5.2 Heat Tracing................................................................................................................................... 14
5.3 Exhaust Air Treatment.................................................................................................................... 14
5.4 Water Traps.................................................................................................................................... 15
5.5 Integration With Pre-action Sprinklers............................................................................................ 15
5.6 Battery Backup............................................................................................................................... 17
6. Ongoing Considerations....................................................................................................................... 17
6.1 Running The VESDA System ........................................................................................................ 17
6.2 System Commissioning.................................................................................................................. 18
6.3 Service And Maintenance .............................................................................................................. 18
7. Appendix – Heat Tracing....................................................................................................................... 19
8. References.............................................................................................................................................. 21
iii
To Next Page
Loading...