What are the basic differences between vertical turbine and end-suction fire pumps under NFPA 20?

What are the basic differences between vertical turbine and end-suction fire pumps under NFPA 20?

• A. Vertical turbine is submerged in a sump with suction from below; end-suction is a horizontal pump with suction from the side; both must meet NFPA 20 performance requirements.
• B. Vertical turbine is always portable; end-suction is always fixed.
• C. Vertical turbine discharges horizontally; end-suction discharges vertically.
• D. There is no difference.

Answer: (A)

The main distinction is how the pump is installed and where the suction comes from. A vertical turbine pump sits in a sump or wet well with the suction from water below the pump; the impellers are stacked on a vertical shaft and the discharge rises through the head to the piping. This submerged suction means the pump typically doesn’t require priming and is well-suited to high-head, large-capacity needs. An end-suction pump is a horizontal centrifugal pump mounted on a base with the suction flange on the side; water is drawn from an external suction line rather than from a submerged sump, so priming is usually required. The discharge is typically above the pump and into the piping. Both types must meet NFPA 20 performance requirements, including capacity and head, and undergo the necessary testing to ensure reliable fire protection operation.

The main distinction is how the pump is installed and where the suction comes from. A vertical turbine pump sits in a sump or wet well with the suction from water below the pump; the impellers are stacked on a vertical shaft and the discharge rises through the head to the piping. This submerged suction means the pump typically doesn’t require priming and is well-suited to high-head, large-capacity needs.

An end-suction pump is a horizontal centrifugal pump mounted on a base with the suction flange on the side; water is drawn from an external suction line rather than from a submerged sump, so priming is usually required. The discharge is typically above the pump and into the piping.

Both types must meet NFPA 20 performance requirements, including capacity and head, and undergo the necessary testing to ensure reliable fire protection operation.