Fire Department Connection (Flush / Exposed / Free-Standing Siamese Connection)

Code-Compliant Exterior Hydraulic Bridge for Structural Fire Defense

During an advanced or fast-spreading structural fire event, a building's standalone water infrastructure can be overwhelmed. Onsite storage tanks can empty rapidly, and building power outages can render primary electric fire pumps useless. The Fire Department Connection (FDC) is the mandatory physical bridge engineered to pass complete operational command over to first responders. It allows municipal fire engine pumpers to connect directly to the facility's backbone and flood the dry risers, wet risers, or fire sprinkler manifolds with an unyielding supply of high-pressure external water.

Built in absolute alignment with NFPA 13 (Standard for the Installation of Sprinkler Systems) and NFPA 14 (Standard for the Installation of Standpipe and Hose Systems), our FDC assemblies utilize a rugged, hydrodynamic design that eliminates severe fluid turbulence. The twin-inlet "Siamese" configuration feeds into a single main discharge pipe. If a field emergency pops an attached hose line or forces the crew to swap engines, internal spring-loaded backflow plates slam shut against the empty port. This retains full pressure within the system and prevents hazardous backflow from spraying out onto the staging grounds.

Core System Architectures

To accommodate varied structural styles and setback codes, the FDC is available in three distinct hardware layouts:

• Exposed Wall-Mount: The manifold body projects directly out from the building's exterior brick or concrete face, facilitating rapid hose alignments.

• Flush Wall-Mount: The internal manifold block stays recessed entirely within the structural wall pocket, leaving only the polished cosmetic identification escutcheon plate and inlet couplings visible on the exterior wall.

• Free-Standing / Yard Type: A standalone vertical pipe assembly installed adjacent to perimeter access roads or sidewalks when structural setbacks place the main building too far from fire engine staging paths.

Key Performance Features

• Premium Cast Copper Alloy Matrix: Poured from high-tensile cast brass or bronze (LG2 Gunmetal), resisting intense hose-torque stresses, thread scoring, and internal oxidation caused by stagnant moisture.

• Independent Dual-Clapper Isolation: Outfitted with dual brass or neoprene-faced clapper plates that operate on independent pivot pins, sealing automatically to maintain network integrity during single-hose pumper setups.

• Standardized National Hose (NH) Threads: Precision-machined with standard $2.5"\text{ National Hose (NH/NST)}$ female swivel connections to ensure immediate, tool-free connection with standard emergency service hose couplings.

• Integrated Auto-Drain Ball Drip Valve: Outfitted with an automated mechanical ball drip device installed at the low point of the dry section. It bleeds off any weeping rainwater or check-valve moisture when the system is idle, preventing freezing, pipe expansion cracks, and ice blockages during sub-zero months.

• Vandal-Resistant Break-Away Security Caps: Features optional heavy-duty cast aluminum or molded plastic break-away caps that snap tightly onto the swivels, shielding the interior thread runs from debris, nesting insects, and tampering while breaking away cleanly with a single mallet strike from arriving fire crews.

Engineering Design & Technical MatrixSystem Metric ParameterExposed / Flush Wall LayoutFree-Standing Sidewalk PillarInlet Interface Array$2\times 2.5"\text{ (65 mm) Female Swivels}$$2\times 2.5"\text{ (65 mm) Female Swivels}$Main System DischargeDN100 / $4"\text{ NPT Threaded or Flanged}$DN100 / $4"\text{ or DN150 / 6\" Flanged Base}$Inlet Thread SpecificationStandard NH (National Hose) / NSTStandard NH (National Hose) / NSTMaximum Working Pressure17.2 bar ($250\text{ PSI}$) Continuous17.2 bar ($250\text{ PSI}$) ContinuousFactory Shell Test PressureHydrostatic testing up to 34.5 bar ($500\text{ PSI}$)Hydrostatic testing up to 34.5 bar ($500\text{ PSI}$)Backflow Prevention TrimTwin Spring-Assisted Clapper DiscsTwin Spring-Assisted Clapper DiscsAesthetic Outer PlatingPolished Brass / Satin Chrome / Red FinishRed Powder Coat / Polished Brass TrimStandard Procurement Package Components

• Complete Fire Department Connection Siamese Manifold Assembly

• Heavy-Duty Cast Metal Identification Escutcheon Plate with Raised, Pre-Engraved Alphanumeric Text (e.g., "AUTOSPRINK", "STANDPIPE", or "TEST CONNECTION")

• Standard Pin-Lug or Rocker-Lug Protective Blanking Plugs with Heavy Brass Retention Chains (or Heavy-Duty Snap-On Aluminum Break-Away Caps)

• Brass $1/2"\text{ Automatic Ball Drip Valve Assembly}$

• Optional System Add-ons: In-Line Check Valves, Sleeve Pipe Escutcheons for Sidewalk Pillars, and Flange Bolt Gasket Interface Packs (Sold Separately)