Three principal causes of unsatisfactory sprinkler performance include which of the following?

Three principal causes of unsatisfactory sprinkler performance include which of the following?

• A. A closed valve in the water supply line
• B. Incompatible sprinkler head type with the system
• C. Incorrect placement of alarm devices
• D. Overheating in building during testing

Answer: (A)

The main factor here is the water supply path to the sprinklers. When a valve in the water supply line is closed, water cannot reach the sprinkler heads, so there is no discharge and no pressurized flow to meet the design requirements. This directly causes unsatisfactory sprinkler performance because the system cannot deliver water where and when it’s needed. Other issues described are important in their own right, but they don't block the hydraulic delivery in the same fundamental way. Using a sprinkler head type that isn’t compatible with the system can affect spray pattern and coverage, but if the supply is open and the system are properly designed, it won’t automatically stop water from reaching the heads. Incorrect placement of alarm devices affects detection and signaling, not the actual discharge from sprinklers. Overheating in the building during testing is not a typical cause of unsatisfactory sprinkler performance in normal operation; it’s an abnormal condition that isn’t part of the standard hydraulic performance issue.

The main factor here is the water supply path to the sprinklers. When a valve in the water supply line is closed, water cannot reach the sprinkler heads, so there is no discharge and no pressurized flow to meet the design requirements. This directly causes unsatisfactory sprinkler performance because the system cannot deliver water where and when it’s needed.

Other issues described are important in their own right, but they don't block the hydraulic delivery in the same fundamental way. Using a sprinkler head type that isn’t compatible with the system can affect spray pattern and coverage, but if the supply is open and the system are properly designed, it won’t automatically stop water from reaching the heads. Incorrect placement of alarm devices affects detection and signaling, not the actual discharge from sprinklers. Overheating in the building during testing is not a typical cause of unsatisfactory sprinkler performance in normal operation; it’s an abnormal condition that isn’t part of the standard hydraulic performance issue.