Dry-pipe vs. wet-pipe fire sprinkler systems — when each is used and why

A wet-pipe system normally contains water in its sprinkler piping. A dry-pipe system normally uses pressurized air or nitrogen with water held back by a dry valve until operation. The appropriate design depends on the building environment, adopted requirements and equipment listings.

Describe heating arrangements, exposed areas, ceiling/roof spaces and prior freeze problems. Ask the qualified designer to evaluate the actual conditions and permitted protection approaches. Do not add antifreeze, operate valves or improvise drainage from an online guide.

Dry systems include additional equipment and coordination needs. Confirm the applicable inspection, testing and maintenance program with a qualified provider; a general article cannot specify every system's intervals or operating procedure.

Provide existing plans, system/equipment records, relevant inspection findings, environmental information and proposed building changes. We review the accepted sprinkler scope and coordinate design, repair and local-authority requirements around the particular project.