Horizontal Single-Stage End Suction Design
The XBD-TQW is a horizontal single-stage end suction fire pump with an axial suction inlet, radial discharge outlet and cantilever close-coupled construction. The impeller is mounted directly on the extended motor shaft, so the pump has no separate bearings — both radial and axial forces are carried by the motor bearings, and the pump and motor are bolted onto one common baseplate. The result is a compact footprint (about 30% less mounting space than conventional base-mounted horizontal pumps), simple alignment and low maintenance.
Advantages
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Full-Flow Non-Overload
Power curve peaks or flattens across the whole flow range, so the motor never overloads or burns out at any point from shut-off to 1.5× rated flow. Safe start-up even when the fire network pressure is low, and sustained operation beyond the 1.5× rated-flow point.
Compact Close-Coupled Unit
Motor and pump share one baseplate with B35 flange mounting. Axial inlet / radial outlet, horizontal shaft. Cuts installation space by ~30% versus conventional horizontal pumps.
Easy Maintenance
Back pull-out (top pull-out for vertical fire pump) design lets the rotating assembly be removed for service without disturbing the pump body or the pipe connections.
Corrosion-Resistant Wetted Parts
SS304 impeller and shaft as standard (bronze impeller optional), mechanical seal with SIC-C / EPDM faces, casing in HT200 / QT400 cast iron.
Broad Performance Coverage
One series covers large firewater flows from 10 to 130 L/s with heads from 20 to 165 m — enough for fire hydrant, sprinkler and water spray systems in most industrial and commercial buildings.
Complete Fire Pump Sets
Available as a bare pump or as a complete fire pump unit (pump + motor + controller / fire pump package) to match project requirements.
The XBD-TQW series covers the working range of most fixed fire protection systems. Custom voltage / frequency and low-speed (1450 rpm) versions are available on request.
Parameter | Value | Parameter | Value |
|---|
Max. Flow | 130 L/s (468 m³/h) | Voltage | 380 V (other voltages on request) |
Max. Head | 165 m (1.65 MPa) | Frequency | 50 Hz (60 Hz on request) |
Rated Flow Range | 10 – 130 L/s | Speed | 2900 / 1450 rpm |
Speed Range & Motor Power | up to 250 kW | Efficiency Level | IE3 |
Discharge Diameter | DN25 – DN300 | Mounting Type | B35, close-coupled |
Max. Working Pressure | PN16 / PN25 | Insulation Class | F |
Liquid Temperature | up to 80 °C | Protection Class | IP55 |
Sealing | Mechanical seal (SIC-C / EPDM) | Cooling | TEFC |
Flange Standard | GB/T 17241.6 (PN16 / PN25) | Structure | Single-stage, horizontal cantilever, end suction |
Note: figures are for the standard 50 Hz / 2900 rpm configuration. Full hydraulic curves, dimensional drawings and weights are available in the product catalogue.
Single-Stage End Suction vs. Multistage Fire Pumps
Both types are common in fire protection. The right choice depends on flow, head and building height. The XBD-TQW single-stage end suction design is the economic and reliable answer for large-flow, low-to-medium-head fixed fire systems.
Comparison | XBD-TQW — Horizontal Single-Stage End Suction | Multistage Fire Pump (e.g. XBD-DW) |
|---|
Impeller | One impeller; axial inlet, radial discharge, cantilever close-coupled | Multiple impellers in series within one casing |
Typical Head | 20 – 165 m per stage — ideal for most buildings & plants | Much higher heads (150 – 400+ m) for super high-rise risers |
Typical Flow | High flow up to 130 L/s at good efficiency | Low-to-medium flow; flow falls as stages are added |
Efficiency at high flow | Higher — one large impeller, fewer hydraulic losses | Lower at large flows — multi-stage friction losses |
Footprint & layout | Compact horizontal unit on one baseplate, low profile | Vertical multistage saves floor area but is tall; horizontal multistage is long |
Maintenance | Top pull-out; rotating parts removed without disturbing piping | Stage disassembly usually required; more wearing rings & seals |
Non-overload behaviour | Full-flow non-overload curve as standard | Depends on model; check curve |
Best-fit systems | Fixed fire protection: fire hydrant, automatic sprinkler, water spray, deluge in industrial & civil buildings | High-rise & super high-rise fire risers, high-head booster duty |
Rule of thumb | Choose when flow demand is large and head ≤ ~1.6 MPa | Choose when the required head is beyond single-stage capability |
Applications
Built for Fixed Fire Protection Systems
The XBD-TQW is first and foremost a fixed fire protection pump. It transports clean water and liquids physically and chemically similar to water, up to 80 °C, with no solid particles (slightly corrosive liquids can be handled with suitable materials).
Primary — Fixed Fire Protection Systems
Fire hydrant extinguishing systems (industrial & civil buildings)
Automatic sprinkler extinguishing systems
Water spray / deluge extinguishing systems
High-rise building firefighting water supply
Factory, warehouse, power plant and mining firewater networks
Independent firewater supply systems
Secondary — General Water Supply Duty
Combined firefighting + domestic / production water supply systems
Building and municipal water supply
Industrial & mining water transfer and drainage
Boiler feed water
Cooling / process water circulation
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