At 1000 kPa, the pumper is rated at what percentage of its rated capacity?

At 1000 kPa, the pumper is rated at what percentage of its rated capacity?

• A. 100%
• B. 60%
• C. 70%
• D. 50%

Answer: (A)

The rated capacity of a pumper is defined at a standard discharge pressure of 1000 kPa (about 145 psi). This is the condition under which the pump is said to deliver its nominal, or rated, flow. So when the discharge pressure is 1000 kPa, the pump is operating at its full, intended capacity—100% of its rated capacity. If you vary the discharge pressure away from that standard, the flow changes along the pump’s performance curve, but the rating is anchored to 1000 kPa.

The rated capacity of a pumper is defined at a standard discharge pressure of 1000 kPa (about 145 psi). This is the condition under which the pump is said to deliver its nominal, or rated, flow. So when the discharge pressure is 1000 kPa, the pump is operating at its full, intended capacity—100% of its rated capacity. If you vary the discharge pressure away from that standard, the flow changes along the pump’s performance curve, but the rating is anchored to 1000 kPa.