The oil-less pneumatic primer push button is used to maintain a reserve in the tank at least how many psi?

The oil-less pneumatic primer push button is used to maintain a reserve in the tank at least how many psi?

• A. 60 psi
• B. 90 psi
• C. 120 psi
• D. 30 psi

Answer: (B)

The essential idea is that the oil-less pneumatic primer uses a small air reservoir to push water into the pump and keep the primed condition ready, especially during drafting. The push button is used to maintain that air reserve so there is enough pressure to drive the priming water into the pump even as resistance and suction change. The recommended minimum reserve pressure is 90 psi because this level provides sufficient push to overcome suction losses and height differences in typical drafting scenarios, helping prevent loss of prime. Pressures much lower than this risk losing prime, while pressures well above are unnecessary for normal operation.

The essential idea is that the oil-less pneumatic primer uses a small air reservoir to push water into the pump and keep the primed condition ready, especially during drafting. The push button is used to maintain that air reserve so there is enough pressure to drive the priming water into the pump even as resistance and suction change. The recommended minimum reserve pressure is 90 psi because this level provides sufficient push to overcome suction losses and height differences in typical drafting scenarios, helping prevent loss of prime. Pressures much lower than this risk losing prime, while pressures well above are unnecessary for normal operation.