Which type of pump is used as a priming pump in typical operations?

Which type of pump is used as a priming pump in typical operations?

• A. Diaphragm
• B. Centrifugal
• C. Piston
• D. Rotary gear

Answer: (D)

Priming a pump is about moving water into the pump and pushing out air so the main pump can develop pressure. A rotary gear priming pump fits this job well because it’s a positive-displacement device that moves a fixed amount of water with every revolution. That means it can reliably pull water from the source and push it through the priming line to fill the pump casing, even when there are small air pockets. It’s simple, durable, and can be operated without relying on the main pump to create the prime, which makes it a dependable choice for quickly establishing a prime during typical operations.

Diaphragm or piston primers can be used in some systems, but the gear-type priming pump’s combination of predictable flow, robustness, and straightforward operation often makes it the preferred option for priming in standard fire-pighting setups. Centrifugal pumps, by contrast, generally cannot prime themselves and require water already in the casing to avoid losing prime, which is why they aren’t used as priming devices.