Pyro-Chem Metal Blow off caps (10 Pack) OEM - 551528
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The Pyro-Chem Metal Blow-Off Caps (P/N 551528) are OEM stainless steel caps that cover the discharge nozzles of a Pyro-Chem Kitchen Knight II restaurant fire suppression system between service intervals. This listing is a 10-pack, providing enough caps to cover a full kitchen suppression system installation in a single order.
Commercial kitchen nozzles are positioned directly in the path of cooking grease vapor, and without a cap in place, grease will gradually build up inside the nozzle orifice between system activations. Enough accumulated grease can partially or fully block the orifice, which would reduce the agent flow rate during a real discharge and alter the spray pattern the system was engineered around. The blow-off cap prevents this by keeping the orifice covered during standby. When the system actuates, the discharge pressure blows the caps free automatically so they do not impede the discharge.
Pyro-Chem's service documentation calls for annual replacement of nozzle caps as part of scheduled semiannual maintenance. After approximately a year of exposure to kitchen heat and grease vapor, a cap may have accumulated enough contamination or sustained enough thermal stress that it should be replaced rather than left in service. The 10-pack quantity supports stocking enough caps for a full system restock at a semiannual service call.
| Feature | Details |
|---|---|
| Manufacturer | Pyro-Chem (A Johnson Controls Brand) |
| Part Number | 551528 |
| Material | Stainless Steel |
| Quantity | 10 Pack |
| System Compatibility | Pyro-Chem Kitchen Knight II Restaurant Fire Suppression System |
| Function | Protects Discharge Nozzles from Grease Buildup in Standby Mode |
| Actuation Behavior | Blows Off Automatically on System Discharge |
| Replacement Interval | Annually (During Semiannual Maintenance Service) |
Kitchen suppression systems are pre-engineered systems under NFPA 17A and NFPA 96. Nozzle cap replacement must be performed by a certified Pyro-Chem distributor as part of scheduled semiannual service.
- Annual Replacement: Nozzle caps should be replaced once per year during one of the required semiannual service visits. Do not leave a cap in service beyond one year of kitchen operation, as grease contamination and thermal exposure can compromise the cap's condition and its ability to blow off cleanly at system actuation.
- Post-Discharge Replacement: After any system discharge, all nozzle caps must be replaced before the system is returned to service. A cap exposed to a full wet chemical discharge should not be reinstalled.
- OEM Caps Only: Use only Pyro-Chem OEM part 551528. Aftermarket caps may vary in fit or blow-off pressure characteristics and have not been tested with the Kitchen Knight II nozzle design.
- Monthly Visual Check: Confirm all nozzle caps are present and in place as part of the monthly visual inspection required under NFPA 17A.
Will the caps interfere with the discharge if a fire occurs?
No. These are blow-off caps designed to be ejected by the discharge pressure when the system activates. They do not require manual removal in an emergency and will not impede the agent discharge if the system actuates normally.
What happens if a cap is missing from a nozzle?
A missing cap should be noted during a monthly inspection and replaced at the next semiannual service or sooner if grease buildup in the nozzle is visible. A heavily contaminated nozzle orifice can affect agent flow rate and spray pattern during discharge.
How many caps does a typical Kitchen Knight II system use?
The number depends on how many nozzles are in your specific system design, which varies based on the number and type of cooking appliances protected. Your certified Pyro-Chem distributor can confirm the exact nozzle count for your system layout.
