What is the nozzle pressure for 44mm Hi-Combat?

• A. 700 kPa
• B. 1000 kPa
• C. 500 kPa
• D. 300 kPa

Answer: (C)

The thing to know is that large-bore nozzles have a manufacturer-specified operating pressure to achieve the intended flow and spray pattern. For the 44 mm Hi-Combat, that specified nozzle pressure is 500 kPa. At this pressure, the nozzle delivers its designed flow with a stable pattern and within the hose and pump’s safe operating range.

Using a higher pressure (such as 700 or 1000 kPa) would push beyond the nozzle’s recommended range, which can alter the spray pattern, increase nozzle reaction, and require more pump pressure. Using a lower pressure (like 300 kPa) would not produce the intended flow or pattern for this nozzle size.

So, 500 kPa is the correct nozzle pressure for the 44 mm Hi-Combat.