Fire Pumps from the Designer's Perspective
2 contact hours · earn 2 NICET CPD points
A fire pump lives or dies on three points on its certified curve. Learn to read those points and design the suction side that lets the pump actually perform.
What you’ll learn
- Distinguish the fire pump types NFPA 20 recognizes — horizontal split-case, vertical in-line, vertical turbine, and positive displacement — and identify which suction condition and application drives the choice of each
- Read a certified pump curve against NFPA 20's three governing points for every centrifugal pump: the rated point, the requirement to deliver at least 65 percent of rated head at 150 percent of rated capacity, and the requirement that shutoff (churn) head not exceed 140 percent of rated head
- Explain churn (no-flow, shutoff) pressure, why a centrifugal pump can run at churn indefinitely while a positive displacement pump cannot, and what the circulation relief valve protects against
- Evaluate a suction condition using net positive suction head (NPSH) available versus required, and distinguish flooded suction from suction lift, wells, wet pits, and open sources
- Apply NFPA 20's suction-side design requirements — the 0 psi minimum at 150 percent flow, backflow-preventer placement, and low-suction-pressure / suction-pressure-regulating controls — to avoid cavitation and pump damage
- Compare electric-motor and diesel-engine fire pump installations, including the sacrificial controller design philosophy, starting/sequencing logic, and the reliability trade-offs of each driver
- Explain a pressure-maintenance (jockey) pump's sizing basis and its relationship to the main fire pump's controller and starting logic
- Work a complete fire-pump-selection case study: choose a rated flow/pressure pairing for a stated demand, verify the choice against the churn-pressure and suction-pressure limits, and contrast the diesel versus electric/VFD implications of the selection
Who it’s for: NICET Water-Based Systems Layout certholders and designers who select, size, or verify fire pump installations.
Preview
1. Why fire pumps deserve a second, harder look
A NICET Water-Based Systems Layout designer who has passed certification already owns the hydraulic-calculation machinery in NFPA 13: density and area, the Hazen-Williams friction-loss formula, hose-stream allowance, elevation pressure. That machinery produces one number the fire pump exists to deliver — a required flow and a required pressure at the pump's discharge flange. What certification exams spend far less time on is the pump itself: what NFPA 20 actually requires of the pump, its driver, and its controller as a certified, listed assembly, and how a designer verifies that a selected pump will really do what its nameplate promises under the worst realistic suction and demand conditions. That gap is where expensive field problems live — a pump that overpressurizes downstream piping at shutoff, a suction condition that starves the impeller and destroys it through cavitation, a controller mismatched to its driver, or a jockey pump sized for the wrong leakage rate.
This course does not re-teach the hydraulic calculation that produces the pump's required flow and pressure; that material belongs to this catalog's water-based hydraulics courses. Here, the demand flow and demand pressure at the pump discharge flange are treated as a given, arriving from that upstream calculation, and the course begins exactly where that calculation leaves off: turning a demand number into a real, buildable, code-compliant pump selection that performs correctly under actual suction conditions, actual churn behavior, and actual driver and controller logic.
NFPA 20's own scope is explicit that it governs the pump, its driver, and its controller together, as a single system whose components must be selected, listed, and installed to work as a unit — not as independently chosen parts that happen to be bolted together on a skid. Every technical claim in this course traces to a specific requirement in the 2022 edition of NFPA 20, Standard for the Installation of Stationary Pumps for Fire Protection, supplemented throughout by the Fire Protection Handbook's (FPH) commentary on how pumps are actually selected, tested, and controlled in practice — grounding that goes beyond the bare code text to the engineering reasoning behind it.
The course closes with a full applied case study: given a stated demand flow and pressure and a real water-supply flow test, you will select a candidate pump rating, verify it against the churn-pressure and suction-pressure limits every centrifugal pump must satisfy, and see exactly what changes in that verification when the driver is a diesel engine instead of an electric motor running under variable-frequency-drive (VFD) speed control.
Finish the course and earn your CPD certificate.
FAQ
Does this course count toward my NICET recertification?
Yes. You earn 1 NICET CPD point per contact hour toward your NICET certification’s recertification requirement — whether you hold Fire Alarm Systems, Water-Based Systems Layout, or another NICET discipline. Points are awarded on your certificate of completion after you finish the course and pass the end quiz.
What are the three governing points on a certified pump curve?
NFPA 20’s rated point, the requirement to deliver at least 65% of rated head at 150% of rated capacity, and the requirement that shutoff (churn) head not exceed 140% of rated head — the course teaches you to check a curve against all three.
Does this cover suction-side design, not just the pump itself?
Yes — NPSH available vs. required, flooded suction vs. suction lift, the 0 psi minimum at 150% flow, backflow-preventer placement, and low-suction-pressure controls are all covered as the design conditions that keep a pump from cavitating.