Which is the most common and least expensive type of automatic sprinkler system?

Which is the most common and least expensive type of automatic sprinkler system?

• A. Deluge
• B. Wet pipe
• C. Dry pipe
• D. Pre-action

Answer: (B)

Wet pipe systems are the most common and least expensive type of automatic sprinkler system. They keep water-filled pipes that release water immediately through a sprinkler head when activated, which makes them simple, reliable, and inexpensive to install and maintain. Because the system is straightforward—fewer components and less complexity—the upfront cost and ongoing maintenance are lower compared to other types. Deluge systems, by contrast, have all heads open and water flows from every head when one is activated, which increases water usage and construction costs. Dry pipe systems trap air or another inert gas in the pipes and require a valve to admit water into the pipes before they reach the heads, causing a slight delay and adding equipment and complexity. Pre-action systems involve a triggering event or sensor to release water into the system, making them the most complex and costly option.

Wet pipe systems are the most common and least expensive type of automatic sprinkler system. They keep water-filled pipes that release water immediately through a sprinkler head when activated, which makes them simple, reliable, and inexpensive to install and maintain. Because the system is straightforward—fewer components and less complexity—the upfront cost and ongoing maintenance are lower compared to other types.

Deluge systems, by contrast, have all heads open and water flows from every head when one is activated, which increases water usage and construction costs. Dry pipe systems trap air or another inert gas in the pipes and require a valve to admit water into the pipes before they reach the heads, causing a slight delay and adding equipment and complexity. Pre-action systems involve a triggering event or sensor to release water into the system, making them the most complex and costly option.