A protected facility with 1200 sprinklers should have how many spare sprinklers?

A protected facility with 1200 sprinklers should have how many spare sprinklers?

• A. 6
• B. 12
• C. 18
• D. 24

Answer: (D)

Spare sprinklers are kept on hand to replace heads that fail or are taken out of service during maintenance, so having a small, ready-to-use stock is part of reliable system operation. The usual guideline is to stock spare sprinklers at two percent of the total installed. For twelve hundred sprinklers, two percent equals twenty-four, so twenty-four spare sprinklers should be maintained. Using fewer—such as six, twelve, or eighteen—does not meet that two percent guideline and would leave the system with too few replacements for practical maintenance needs.

Spare sprinklers are kept on hand to replace heads that fail or are taken out of service during maintenance, so having a small, ready-to-use stock is part of reliable system operation. The usual guideline is to stock spare sprinklers at two percent of the total installed. For twelve hundred sprinklers, two percent equals twenty-four, so twenty-four spare sprinklers should be maintained. Using fewer—such as six, twelve, or eighteen—does not meet that two percent guideline and would leave the system with too few replacements for practical maintenance needs.