{"id":18074,"date":"2026-10-29T22:17:11","date_gmt":"2026-10-29T22:17:11","guid":{"rendered":"https:\/\/azeidkgroup.com\/?p=18074"},"modified":"2026-10-29T23:06:27","modified_gmt":"2026-10-29T23:06:27","slug":"fire-pump-selection-egypt","status":"publish","type":"post","link":"https:\/\/azeidkgroup.com\/en\/eg\/media-center\/fire-pump-selection-egypt\/","title":{"rendered":"Fire Pump Selection in Egypt: Flow, Pressure and Operation"},"content":{"rendered":"\t\t
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The fire pump turns a water tank into a network that delivers the designer’s flow and pressure. That is why fire pump selection<\/strong> starts with the hydraulic calculations for the system the pump will serve, not with a catalogue or with a size used on another project.<\/p>\n

This guide explains the figures in a pump offer: flow in GPM and m\u00b3\/h, pressure in bar and psi, the rated duty point and the NFPA 20 performance curve. It also covers each pump’s role, controllers, suction conditions and handover documents.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Key takeaways<\/h2>
  • Flow and pressure come from the designer’s hydraulic calculations, not estimates.<\/li>
  • Under NFPA 20, a centrifugal fire pump must deliver 150% of rated flow at no less than 65% of rated pressure, and its churn pressure must not exceed 140% of rated pressure at rated speed.<\/li>
  • The usual set is an electric main pump, a diesel standby pump and a jockey pump to make up for leakage.<\/li>
  • Correct suction comes first; a bigger motor cannot fix poor suction.<\/li>
  • The certified manufacturer’s curve, the datasheet, the factory test report and the site acceptance test are the core handover documents.<\/li><\/ul><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Where does fire pump selection start?<\/h2>\n

    The pump comes at the end of a chain of design decisions. The designer defines the systems it serves (sprinklers, hose cabinets, external hydrants), calculates the demand of the hydraulically most demanding area and adds any hose allowance. The result is two figures: required flow, and required pressure at the pump discharge after friction losses and elevation differences.<\/p>\n

    Capacity cannot be set without hydraulic calculations by a qualified designer, approved under the Egyptian fire protection code and the approving authority’s requirements. Floor count, building area or the pump on a similar project are not a valid basis. Figures here are illustrative only, not a recommendation for any project.<\/p>\n

    NFPA 20 (latest edition 2025) is a widely used technical reference for pump rooms in Egypt and the region. The legally binding reference is what the Egyptian code and the approving authority set; NFPA 20 supplies the technical detail the designer adopts or the contract calls for.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Flow and pressure: reading the units correctly<\/h2>\n

    Pumps are usually offered in US gallons per minute (GPM) and bar or psi, while local calculations may use m\u00b3\/h or L\/min. Mixed units are a common source of error when comparing offers. For conversion:<\/p>\n

    • 1 GPM is about 0.227 m\u00b3\/h, or 3.785 litres per minute.<\/li>
    • 1 bar is about 14.5 psi, which is roughly 10.2 metres of water column.<\/li><\/ul>\n

      Rated pressure is the net pressure the pump adds between suction and discharge at rated flow. Network pressure is that plus suction pressure. An offer must state whether its figure is net or discharge pressure, and offers must be compared on the same basis.<\/p>\n

      Duty point<\/th>Flow (approx. m\u00b3\/h)<\/th>Pressure (approx. psi)<\/th>150% flow (GPM)<\/th>Minimum pressure at 150% (bar)<\/th><\/tr><\/thead>
      500 GPM @ 8 bar<\/td>113.6<\/td>116<\/td>750<\/td>5.2<\/td><\/tr>
      750 GPM @ 9 bar<\/td>170.3<\/td>130.5<\/td>1125<\/td>5.85<\/td><\/tr>
      1000 GPM @ 10 bar<\/td>227.1<\/td>145<\/td>1500<\/td>6.5<\/td><\/tr>
      1500 GPM @ 10 bar<\/td>340.7<\/td>145<\/td>2250<\/td>6.5<\/td><\/tr>
      1500 GPM @ 12 bar<\/td>340.7<\/td>174<\/td>2250<\/td>7.8<\/td><\/tr><\/tbody><\/table><\/div>\n

      These figures come only from unit conversion and the 65% rule. Actual performance is read from the certified manufacturer’s curve.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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      The rated duty point and the NFPA 20 performance curve<\/h2>\n

      Meeting the rated point is not enough. NFPA 20 sets conditions on the whole curve, because real demand in a fire may differ from the design point. For centrifugal pumps, including horizontal split-case pumps:<\/p>\n

      • Churn (shut-off) point:<\/strong> at zero flow, pressure must not exceed 140% of rated pressure at rated speed.<\/li>
      • Rated point:<\/strong> 100% of rated flow at no less than 100% of rated pressure.<\/li>
      • Overload point:<\/strong> 150% of rated flow at no less than 65% of rated pressure.<\/li><\/ul>\n

        In practice, the calculated demand should sit in the middle of the curve. Specialist references note that demand should not exceed 150% of rated flow, and that running near that limit makes performance more sensitive to suction. Churn pressure plus the highest static suction pressure must be checked against the rating of pipes, valves and fittings. If it is higher, the designer picks a pump with a flatter curve or uses a solution the standard allows.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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        The role of each pump: electric, diesel and jockey<\/h2>\n

        Electric main pump<\/h3>\n

        The electric pump carries the main duty and needs a reliable power supply. The designer sets its source, routing and protection under the Egyptian code’s electrical requirements and whatever the design adopts from NFPA 20 and NFPA 70.<\/p>\n

        Diesel standby pump<\/h3>\n

        The diesel pump gives a power source independent of the grid. Its room needs ventilation, a fuel tank sized by the designer, and an exhaust route. Under NFPA 20, the diesel engine needs two independent starting sources, and the controller alternates between them.<\/p>\n

        Jockey pump<\/h3>\n

        A small pump that keeps the network pressurised and makes up for minor leakage, so the main pump does not start needlessly. Its flow must be less than one sprinkler’s, so that when a sprinkler opens, pressure drops and the main pump starts. The designer sets the start and stop pressures of each pump in a clear sequence: jockey first, then electric, then diesel.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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