BY DAVID T. PHELANFire sprinkler systems are an invaluable resource in our fire protection arsenal. As building codes continue to evolve, these systems are becoming increasingly common in all types of occupancies and sizes of construction. This increased presence in our communities demands a greater awareness and understanding on the part of all fire service personnel including firefighters, company officers, command officers, and code officials. Each person involved needs to understand how these systems will impact their function and how that affects other fireground operations. A sprinkler system is of little value without an adequate and reliable water supply; yet, one of the least und...