ESF40/20 UL/FM Horizontal End Suction Fire Pump 50 GPM @ 76–157 PSI Designed For NFPA 20 Fire Protection Systems

NMFIRE fire pump packages are manufactured through advanced hydraulic design, precision machining, and strict quality control processes to ensure reliable operation in critical fire protection applications.

Advanced Computational Fluid Dynamics (CFD) analysis and 3D hydraulic design are applied to optimize internal flow performance:

• Improved hydraulic efficiency
• Reduced hydraulic losses
• Lower required engine power
• Stable flow and pressure performance

Pump casing manufacturing adopts Lost Foam Casting Technology to improve surface quality and hydraulic performance. Manufacturing capabilities include:

• CNC processed metal patterns
• Automatic molding line
• Automatic sand processing production line
• Intermediate frequency melting furnace
• VOD refining furnace
• Precision wax casting technology

Critical components are processed through precision CNC machining. Quality control includes:

• Impeller machining and dimensional inspection
• Shaft machining and runout verification
• Assembly alignment verification
• Dynamic balancing test for all rotating components

Each NMFIRE fire pump package undergoes factory performance verification before delivery per NFPA 20 requirements. Testing includes:

• Shut-off (churn) pressure testing — must not exceed 140% of rated pressure
• Rated flow and rated pressure verification
• 150% rated flow verification — pressure must be ≥65% of rated pressure
• Pressure-flow curve recording (minimum 5 test points)
• Operating parameter monitoring (vibration, temperature, noise)

Our dedicated fire pump test bench enables:

• Accurate flow measurement via calibrated flow meter
• Pressure monitoring at suction and discharge
• Complete performance curve generation
• Third-party witness testing arrangement per project requirements

For seawater service, corrosion-resistant, or other special material requirements, please contact us to discuss.

Fire protection projects often require technical documents for consultant approval and installation. NMFIRE provides project-specific engineering support.

Standard Documents:

• Factory Test Report — including the pump performance curve
• Pump Drawings — outline and dimensional drawings

For skid-mounted or containerized packages, or any other document requirements, please contact us to discuss.

A horizontal end suction fire pump takes suction on the horizontal axis through the casing eye and discharges vertically from the top of the casing. Compared with a horizontal split case pump, the end suction layout is simpler, more compact, and more economical — well suited to smaller fire protection duties. The NMFIRE ESF40/20 delivers 50 GPM at 76–157 PSI in this format, UL Listed and FM Approved per NFPA 20, with a back pull-out design that allows the rotating assembly to be serviced without disturbing the piping.

Horizontal split case pumps split the casing horizontally, so internal parts are serviced by removing the top half without disturbing piping; they are typically used for medium to high flow duties. End suction pumps have a single-piece casing with suction on the axis and discharge on top — the most compact and economical layout for small to medium duties such as 50–750 GPM, and available from NMFIRE in high-flow ratings up to 2500 GPM. Vertical inline pumps mount the motor above the pump with both nozzles on the same vertical centerline, minimizing footprint in very tight plant rooms. All three types are available from NMFIRE with UL Listed certification per NFPA 20. Selection depends on project flow, available space, and installation constraints.

The ESF40/20 is rated at 50 GPM, with selectable pressure ratings from 76 to 157 PSI (head 51–110 m) at 2980 RPM (50 Hz) / 3550 RPM (60 Hz). Maximum shaft power is 20 HP / 14.9 kW at the 111 PSI duty point. Each duty point is driven by a matched ODP or TEFC electric motor from 15 to 30 HP, or by a diesel engine (39 to 61 HP) where electric supply is unreliable. The full selection table and performance curves are available on request.

The choice depends on the reliability of the site power supply. Where the mains supply is dependable, an electric driven fire pump (ODP or TEFC enclosure) offers lower installed cost, simpler maintenance, and no fuel storage requirements. Where the grid is unstable or unavailable — common across many African project locations — a diesel driven fire pump keeps the fire protection system fully independent of mains power per NFPA 20. The ESF40/20 is certified with both driver options, so the same hydraulic package can be configured either way for your project.

Sizing starts from the hydraulic calculations of the sprinkler or standpipe system: the required flow (GPM) at the most demanding point plus hose stream allowance, and the pressure needed to overcome elevation, friction losses, and required residual pressure at the topmost outlet, minus available municipal supply pressure. The selected pump must then meet the NFPA 20 performance criteria: at 150% of rated flow, discharge pressure must be ≥65% of rated pressure; at shut-off (zero flow), pressure must not exceed 140% of rated. NMFIRE engineering can verify the duty point against the ESF40/20 selection table and issue a project-specific performance curve for consultant approval.

The ESF40/20 pump unit itself comprises the end suction pump and its electric motor or diesel engine driver. For projects requiring a complete fire pump system, NMFIRE can configure packages that add a UL Listed fire pump controller, a jockey pump for pressure maintenance, and a pressure relief valve where required. Delivery options include conventional plant room installation, a skid-mounted fire pump system with pre-piped pump and jockey pump on a common base, and a fully containerized fire pump station pre-assembled for plug-and-play site connection. Package scope is configured per NFPA 20 and project requirements.

A 50 GPM fire pump is a compact rating for light hazard occupancies: small offices, shops, restaurants, guesthouses, and small apartment blocks. The ESF40/20's 76–157 PSI range (50 Hz and 60 Hz options) covers most small-system pressure demands, and its diesel-driven option suits remote or weak-grid sites such as rural guesthouses and off-grid facilities. For larger duties (100–2500 GPM), NMFIRE offers a full range of end suction, horizontal split case, and vertical inline models.

Yes. NMFIRE fire pump packages are designed according to NFPA 20 requirements. The ESF40/20 horizontal end suction model is UL Listed / FM Approved. Each pump is factory performance tested per NFPA 20 including shut-off pressure verification (max 140% of rated), rated flow testing, and 150% rated flow verification at no less than 65% of rated pressure.

Yes. Factory test reports including pump performance curves, together with pump outline and dimensional drawings, are provided as standard technical documents. For skid-mounted or containerized packages, or any other document requirements, please contact us to discuss. Third-party witness testing at our fire pump test facility can also be arranged per project requirements.