Which pump is described as a horizontal pump?

• A. End Suction Pump
• B. Fire Pump
• C. Gear Pump
• D. Horizontal Pump

Answer: (D)

A horizontal pump is described by the orientation of its drive shaft being horizontal. In this setup, the pump and the motor sit on a common base side-by-side, with a coupling connecting them, which makes maintenance and alignment straightforward and keeps piping convenient. This horizontal arrangement is common for centrifugal fire pumps in NFPA 20 because it offers easy access and stable operation.

The other terms don’t describe orientation. End suction refers to where the suction connection is located, not how the pump is oriented. A fire pump is a general category for pumps used in fire protection, and a gear pump is a positive-displacement pump type. Only the term that explicitly states horizontal denotes the orientation of the pump.