For a 4 inch sprinkler riser, how wide must the main drain be?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $9.99Unlock all

Prepare for the Florida Fire Inspector 1 Exam. Study with expertly crafted quizzes, flashcards, and in-depth explanations to enhance your understanding and boost your confidence. Successfully pass your exam!

Multiple Choice

For a 4 inch sprinkler riser, how wide must the main drain be?

Explanation:
Sizing the main drain to handle the discharge from the riser is the key idea. For a 4-inch sprinkler riser, the main drain is typically sized to about half the riser diameter, which yields 2 inches. This provides a drain that Relieves pressure and drains the system quickly without creating excessive velocity or backpressure. A 1-inch drain would bottleneck drainage, while 3 or 4 inches would be larger than necessary for a 4-inch riser and add cost.

Sizing the main drain to handle the discharge from the riser is the key idea. For a 4-inch sprinkler riser, the main drain is typically sized to about half the riser diameter, which yields 2 inches. This provides a drain that Relieves pressure and drains the system quickly without creating excessive velocity or backpressure. A 1-inch drain would bottleneck drainage, while 3 or 4 inches would be larger than necessary for a 4-inch riser and add cost.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy