SCF125-100-330x2  UL/FM Two-Stage Split Case Fire Pump  500–750 GPM, 500 GPM @ 330 PSI  50Hz (2950 RPM) / 60Hz (3550 RPM)  Diesel or Electric Drive — Up to 616 PSI

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.

The SCF125-100-330x2 uses two impellers arranged in series within the split casing. The first-stage impeller pressurizes the fluid, which then passes through an inter-stage channel to the second-stage impeller for further pressure amplification. This configuration nearly doubles the discharge pressure compared to a single-stage pump at the same flow and speed, enabling the 616 PSI maximum rating that single-stage designs cannot achieve.

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

• Improved hydraulic efficiency
• Reduced hydraulic losses
• Lower required motor 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.

The SCF125-100-330x2 offers the broadest diesel engine coverage in the SCF range, with three engine models matched to different speed and duty requirements:

• NM4-104B (2200 RPM, 109 HP) — dedicated reduced-speed diesel for 500 GPM at 162–212 PSI (UL Listed). The 2200 RPM engine speed extends engine service life and reduces noise, ideal for occupied building pump rooms and remote installations.
• NM6-110D (2900 RPM, 239–268 HP) — 50Hz diesel for both 500 and 750 GPM duty points at 284–405 PSI. The primary diesel selection for African projects on 50Hz grids requiring NFPA 20 backup power.
• NM6-108E (2950 RPM, 335 HP) — 50Hz diesel for higher-pressure 500 and 750 GPM duty points at the top of the 50Hz pressure envelope (350–405 PSI).

Diesel packages include engine-driven cooling, starting batteries, and engine controller matched per NFPA 20. The diesel engine is the NFPA 20 preferred driver where a backup power source is required for the fire pump — common on African project sites with unreliable or no mains power.

The SCF125-100-330x2 electric drive is available with motor size matched to each duty point from 200 to 400 HP:

• ODP (Open Drip Proof) — economical enclosure for clean, dry, well-ventilated indoor pump rooms
• TEFC (Totally Enclosed Fan Cooled) — sealed enclosure for dusty, humid, hot, or outdoor-adjacent environments; the common choice for African project sites

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 two-stage split case fire pump uses two impellers arranged in series within the split casing. The first stage pressurizes the fluid, and the second stage further amplifies the pressure — nearly doubling the discharge pressure of a single-stage pump at the same flow and speed. The SCF125-100-330x2 reaches up to 616 PSI, far beyond the 279 PSI maximum of single-stage SCF models. Choose a two-stage pump when system hydraulic calculations demand discharge pressures that exceed single-stage capabilities — typical for refineries, ultra-high-rise standpipe systems, and heavy industrial fire water networks.

UL (Underwriters Laboratories) Listing and FM (FM Approvals) certification are two independent third-party certifications verifying that a fire pump meets the applicable standards (such as UL 448 and FM 1311). Both are widely accepted by fire protection consultants, insurers, and authorities having jurisdiction in export markets. Many projects specify either one; some require both. The SCF125-100-330x2 carries both UL Listing and FM Approval, giving maximum flexibility for consultant approval and insurance acceptance on international projects.

The SCF125-100-330x2 covers rated flows of 500 and 750 GPM, with pressure ratings from 162 to 616 PSI (head 114–433 m). At the 500 GPM duty point, 50Hz operation (2950 RPM) delivers 284–405 PSI while 60Hz operation (3550 RPM) reaches up to 616 PSI. The 2200 RPM diesel-only speed covers 162–212 PSI at 500 GPM (UL Listed). Driver options span diesel engines from 109 to 335 HP (three engine models) and ODP/TEFC electric motors from 200 to 400 HP. The full selection table and performance curves for each flow/pressure/speed combination are available on request.

Match the pump to your site power supply. Most of Africa (including Egypt, Ghana, Kenya, and Nigeria), the Middle East, Asia, and Europe use 50Hz grids, where the SCF125-100-330x2 runs at 2950 RPM. The Americas and a few other territories use 60Hz, where the pump runs at 3550 RPM. The same UL/FM certified pump model serves both — only the rated speed, pressure envelope, and driver selection differ. If your site has unreliable or no mains power, a diesel engine drive at 50Hz (NM6-110D or NM6-108E at 2900–2950 RPM) or the dedicated 2200 RPM diesel speed provides an independent backup per NFPA 20.

The SCF125-100-330x2 is the most diesel-capable pump in the NMFIRE SCF range, with three engine models covering different speed and duty requirements:

• NM4-104B (2200 RPM, 109 HP) — a dedicated reduced-speed diesel for 500 GPM at 162–212 PSI (UL Listed only). Lower engine speed means longer service life, lower maintenance, and quieter operation — preferred for occupied building pump rooms and noise-sensitive sites.
• NM6-110D (2900 RPM, 239–268 HP) — the primary 50Hz diesel for both 500 and 750 GPM at 284–405 PSI. The standard selection for African projects requiring NFPA 20 backup power on 50Hz grids.
• NM6-108E (2950 RPM, 335 HP) — for higher-pressure 50Hz duties at the top of the pressure envelope (350–405 PSI).

The three-engine approach lets NMFIRE match the engine to the exact duty point and site conditions rather than oversizing a single engine across all duties.

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, 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, pressure must not exceed 140% of rated. For high-pressure duties exceeding 279 PSI, the two-stage SCF125-100-330x2 is the appropriate selection. NMFIRE engineering can verify your duty point against the selection table and issue a project-specific performance curve for consultant approval.

Horizontal split case pumps are the most common fire pump type: easy to service in place, and suitable for medium to high flow duties (the SCF125-100-330x2 covers 500–750 GPM with pressure up to 616 PSI in two-stage configuration). End suction pumps offer a simple, economical layout for lower duties. Vertical inline pumps have the most compact footprint for space-limited plant rooms and retrofits. All three types are available from NMFIRE with UL Listed and FM Approved certification per NFPA 20. Selection depends on project flow, pressure, available space, and maintenance strategy.

Yes. The same UL/FM certified pump is available with NM4/NM6 series diesel engine drive (109–335 HP across three engine models at 2200 or 2900–2950 RPM) or with ODP/TEFC electric motor drive (200–400 HP, 50Hz or 60Hz). Diesel drive is the NFPA 20 preferred choice where a backup power source is required — common on sites with unreliable grids across Africa. The 2200 RPM dedicated diesel speed is available for 500 GPM at 162–212 PSI (UL Listed). Note that diesel drive is available at 50Hz only for this model; 60Hz operation is electric-only. Engine power is verified per site altitude and ambient temperature per NFPA 20 derating rules.

Yes. The SCF125-100-330x2 is the highest-pressure model in the NMFIRE SCF split case range, reaching 616 PSI at 60Hz (3550 RPM) thanks to its two-stage impeller design. At the 500 GPM duty point it delivers up to 405 PSI on 50Hz and up to 616 PSI on 60Hz — sufficient for refinery fire water networks, ultra-high-rise standpipe systems, and elevated storage tank applications. For sustained duties at the top of the pressure envelope, NMFIRE engineering confirms the impeller, casing, and driver selection against the certified performance curve and issues the project-specific factory test report for consultant approval.

Most African countries have no domestic fire pump manufacturing standard; NFPA 20 is the reference standard most commonly adopted by fire consultants, insurers, and regulators across Egypt, Ghana, Kenya, Nigeria, Tanzania, South Africa, and the wider region. UL Listing and FM Approval are the recognized third-party certifications for imported fire pumps. African grids are 50Hz, so the SCF125-100-330x2 2950 RPM (50Hz) configuration — with NM6-110D diesel backup — is the standard selection for these markets. NMFIRE supplies NFPA 20-compliant, UL/FM certified fire pumps and project documentation suited to consultant approval processes in these regions.

A 500 GPM two-stage fire pump with pressure up to 616 PSI is suited to the most demanding fire protection duties: refinery and petrochemical process areas (a frequent requirement in Egypt and across African industrial markets), thermal and hydroelectric power plants, ultra-high-rise standpipe systems, elevated storage tank fill, and heavy industrial fire water networks. The 2200 RPM diesel option extends coverage to remote sites and off-grid installations at 162–212 PSI. For higher flow duties, the same pump model extends to 750 GPM.

The SCF125-100-330x2 pump unit itself comprises the two-stage horizontal split case pump and its diesel engine or electric motor. For projects requiring a complete fire pump system, NMFIRE can configure packages that add a UL/FM 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.

Yes. NMFIRE fire pump packages are designed according to NFPA 20 requirements. The SCF125-100-330x2 two-stage horizontal split case model is UL Listed and 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.