Pyro-Chem 2D Nozzle, 10 Pack - 551038

The Pyro-Chem 2D Nozzle (Part No. 551038) is a high-capacity OEM discharge component engineered for the Kitchen Knight II wet chemical system. Unlike the standard 1H variants, the 2D model is a Two-Flow-Point (2.0 FP) nozzle designed to deliver double the volume of extinguishing agent per second. This makes it the definitive choice for protecting high-hazard, large-surface appliances such as heavy-duty charbroilers, industrial-sized fryers, and double-bank griddles.

The 2D designation refers to its specific discharge geometry, which is optimized for wide-area distribution. It atomizes the wet chemical agent into a dense mist that initiates rapid saponification, turning burning fats into a cooling foam blanket. By utilizing a 2.0 FP nozzle, designers can achieve total hazard coverage with fewer total nozzle drops, simplifying the stainless steel piping manifold while maintaining the strict UL 300 and NFPA 17A standards required for industrial-scale food production where a more aggressive agent discharge rate is necessary for fire knockdown.

The 551038 must be installed by a licensed fire suppression technician in strict accordance with the Kitchen Knight II design manual and the system's as-built drawings. Because the 2D nozzle consumes 2.0 flow points, the total flow point count of all nozzles in the system must not exceed the rated capacity of the agent tank. Exceeding this limit will result in an incomplete discharge and a failed suppression event.

Nozzle placement must conform to the specific Nozzle Aiming Point (NAP) for each protected appliance as defined in the KKII design manual. The factory-authorized blow-off cap must always be installed to protect the precision-machined orifice from grease loading between service intervals. During each semi-annual inspection, technicians must verify the cap is present and undamaged, and that the orifice is free of blockage. Any nozzle showing signs of corrosion, deformation, or orifice restriction must be replaced with a new OEM 551038 to maintain the system's UL listing.

How does the 2.0 Flow Point (FP) rating affect my system tank size?

Because the 2D nozzle consumes two flow points, it counts as two units against your total agent tank capacity. For example, a Pyro-Chem PCL-300 tank (rated for 10 flow points) can support five 2D nozzles. This allows for massive agent delivery on bulk production lines without exceeding the hydraulic limits of the propellant.

Can the 2D nozzle be used for duct protection?

While primarily for appliances, the 2D nozzle is often specified for large-diameter exhaust ducts where a 1.0 FP nozzle would provide insufficient volume. Always refer to the design manual for the specific maximum duct perimeter covered by a single 551038 nozzle.

Does this nozzle require a specific blow-off cap?

Yes. Due to the higher discharge velocity of the 2.0 FP orifice, it is critical to use the factory-authorized nozzle cap. This protects the precision-machined orifice from grease-loading while ensuring the cap releases instantly under the high-pressure surge of a system activation.