Which device is rated at about 15 PSI?

Which device is rated at about 15 PSI?

• A. Elkhart 1 inch Booster Line Chief Nozzle
• B. Main pump drain
• C. Multiversal or Deck Gun
• D. Thelma brakes

Answer: (C)

The key idea here is recognizing which device is designed to deliver a high-volume water stream at a very low discharge pressure. A multiversal or deck gun is built to produce large flows as a master stream, and in some settings it can be operated effectively at a low nozzle pressure—around 15 psi—so you can push a substantial volume of water with manageable recoil and pump load. The deck gun’s design emphasizes high capacity more than high nozzle pressure, which is why it’s associated with that low-pressure range. The other options aren’t geared toward that low-pressure master stream role. A booster-line chief nozzle is a small-diameter nozzle meant for higher pressures to drive water through a short, flexible line. The main pump drain is simply a valve for draining the pump, not a device rated for delivering a firefighting stream at a specified psi. Thelma brakes relate to the braking system and aren’t discharge devices. So, in the context of a device rated around 15 psi for its operation, the deck gun fits the idea of a low-pressure, high-volume tool.

The key idea here is recognizing which device is designed to deliver a high-volume water stream at a very low discharge pressure. A multiversal or deck gun is built to produce large flows as a master stream, and in some settings it can be operated effectively at a low nozzle pressure—around 15 psi—so you can push a substantial volume of water with manageable recoil and pump load. The deck gun’s design emphasizes high capacity more than high nozzle pressure, which is why it’s associated with that low-pressure range.

The other options aren’t geared toward that low-pressure master stream role. A booster-line chief nozzle is a small-diameter nozzle meant for higher pressures to drive water through a short, flexible line. The main pump drain is simply a valve for draining the pump, not a device rated for delivering a firefighting stream at a specified psi. Thelma brakes relate to the braking system and aren’t discharge devices. So, in the context of a device rated around 15 psi for its operation, the deck gun fits the idea of a low-pressure, high-volume tool.