Single-suction and vertical inline pumps for fire-water supply
Single-stage, single-suction fire-water pumps cover 150–750 US gpm; vertical inline pumps cover 150–1,000 US gpm. Select the pump by its required flow and head, then define the driver and controller supplied with the unit.
| Pump family | Flow range (US gpm) | Pressure range (psi) | Casing | Driver selection |
|---|---|---|---|---|
| Single-stage single-suction | 150–750 | 40–151 | Ductile iron | Electric motor or diesel engine |
| Vertical inline centrifugal | 150–1,000 | 40–150 | Cast iron | Electric motor |
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A pump selection identifies one flow and pressure at a stated speed and impeller diameter. Our quotation pairs that selection with the driver data and assembly drawing. The catalog ranges cover multiple selections, each with its own operating curve.
Find a flow rate or pressure band.
| Flow (US gpm) | Converted flow (m³/h) | Single-suction pressure band (psi) | Vertical inline pressure band (psi) |
|---|---|---|---|
| 150 | 34.1 | 40–139 | 40–150 |
| 200 | 45.4 | 40–138 | 40–133 |
| 250 | 56.8 | 41–136 | 40–133 |
| 300 | 68.1 | 48–134 | 53–145 |
| 400 | 90.8 | 42–146 | 41–140 |
| 450 | 102.2 | 54–146 | 43–139 |
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The bands cover different catalog selections at approximately 3,000 rpm, not one pump curve. Metric flow uses 0.227125 m³/h per US gpm. A 60 Hz requirement is a separate duty selection, supplied with its actual curve, speed, impeller and driver data in the offer.
For water with a specific gravity of approximately 1, a 100 psi pressure increase corresponds to about 231 ft, or 70.4 m, of head. The inlet pressure is a separate system condition: discharge pressure alone does not identify the head the pump must add. Casing pressure limits are checked separately from the duty-point pressure increase.
The hydraulic calculation establishes the required duty. Its operating range also matters: a fixed-speed pump selected at one point must remain suitable as system demand changes. The head-flow curve, efficiency and allowable operating region provide the basis for that comparison.
Net positive suction head available comes from the water source and suction arrangement; the required value comes from the selected pump. Water level, temperature and suction losses affect the margin. A flooded-suction centrifugal fire pump is a different selection from a pump taking water under lift conditions.
Driver sizing follows the pump’s absorbed power over the required operating range. A motor’s horsepower alone does not establish the delivered flow or head. The selection sheet keeps the curve speed, impeller diameter and driver rating together.
An end-suction layout brings water into the impeller through the suction end and discharges through the volute outlet. The assembly drawing locates both nozzles, the base and the driver. Horizontal coupled units also need access around the coupling guard and service-removal path.
Opposed inline ports place the suction and discharge on a common pipe axis, with the motor above the casing. The smaller floor arrangement trades horizontal space for height and overhead service access. The drawing fixes support points and the space needed to remove the rotating assembly.
Connection size, drilling and gasket face must match the mating pipework. Pipe supports carry the piping rather than forcing misalignment into the pump nozzles. Reducers, valves and the suction route follow the approved installation design and the pump’s connection drawing.
A replacement comparison includes nozzle position, flange standard, base fixing and overall service envelope. Matching the old pipe diameter leaves those dimensions unresolved. Our drawing review identifies the changed connections or foundation details before the replacement scope is priced.
| Supply format | Main equipment | Package detail |
|---|---|---|
| Pump assembly | Casing and selected rotating assembly | Driver, base and controls itemized separately |
| Pump with driver | Pump and selected electric or diesel driver | Base, coupling/guard and accessories identified on assembly drawing |
| Pump, driver and controller | Pump/driver plus specified controller | Controller identity, sensing and electrical scope listed by item |
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The motor offer identifies voltage, phase, frequency, nameplate speed and rated power with the selected pump curve. Driver and controller data are returned under the same equipment tag.
The single-suction catalog also includes diesel drive. That package has its own engine, starting, cooling and fuel-system scope; it does not share an electric motor’s supply requirements. The engine data and assembly layout are identified with the selected pump duty.
A dedicated fire-pump controller has a different starting, monitoring and approval scope from a general motor starter. Jockey pumps, their controllers, test equipment and site piping remain separate items unless named in the package. Each included item appears on the equipment list.
The pump model or serial number, accepted curve and assembly drawing are supplied under the equipment tag. Driver and controller records identify the components included with that unit.
A casing pressure test checks the pressure-containing assembly. A performance test records flow and head at the specified speed, with the power and other acceptance data required by the order. The release plan identifies test points, acceptance criteria and witnessing requirements before testing.
Nozzles, mounting points and overall dimensions are checked against the approved assembly drawing. Inspection also covers coupling protection, fasteners and external condition, with the unit identity on the record.
NFPA 20 addresses the installation of stationary pumps for fire protection. Where the project requires UL Listing or FM Approval, the acceptance documents identify the exact pump, driver, controller and covered duty. We review that component scope against the project requirements before order acceptance.
Crate supports secure the pump base or designated mounting points. Covers protect open nozzles and machined flange faces; the motor, guard and projecting connections remain clear of crate loads. A packed pump unit is handled through its approved lifting arrangement.
The packing list separates the pump unit, driver, controller and boxed accessories by equipment tag. Loose components retain their own quantities. Preservation and storage instructions accompany the selected equipment, including any preparation needed before commissioning after storage.
Pump units, drivers, controls and accessories are itemized for the requested destination. Packed dimensions and weights accompany the shipment plan, with the production schedule and delivery terms on the quote.
Yes. The nameplate, existing curve and installation drawing establish the reference unit. A replacement is matched to the required duty and installation, with the proposed model identified separately from the original manufacturer’s model number.
The quotation covers the specified pump, driver, controller and supply documents. Site installation, electrical work, hydraulic commissioning and authority acceptance remain separate project responsibilities.
Model-matched spare parts can be included in the equipment quotation. Seal construction and impeller configuration follow the selected pump; a flange size or motor horsepower is insufficient to identify those parts.
A changed duty, power supply or installation drawing triggers a revised selection and quotation. The accepted revision identifies the pump configuration, documents and delivery scope used for the order.
Send the pump duty sheet, site power supply and delivery destination. We quote the selected hydraulic duty, driver, controller and accessories together, with the installation drawing and required release documents.