Recently, ORR Protection Systems has fielded an increased number of questions regarding Video Smoke Detection and Video Flame Detection through our "Ask an Expert" portal. Since the interest seems to be increasing we thought it would be helpful to post the most frequently asked questions about this type of detection.
Dry and pre-action sprinkler systems can be especially susceptible to early failure due to internal pipe corrosion. As the old saying goes, "An ounce of prevention is worth a pound of cure." NFPA 13, Standard for the Installation of Sprinkler Systems, gives the minimum "prevention" steps for preventing corrosion. NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, Chapter 14, gives the minimum "pound of cure."
Steel pipes corrode quickly in dry sprinkler systems. The concepts behind corrosion and MIC are explained in this blog:Understanding Corrosion and Microbiologically Induced Corrosion (MIC). Both wet and dry (pre-action) sprinkler systems have corrosion issues, but they are dramatically worse in dry systems.