Product Overview
The XBD-GDL Vertical Multistage Fire Pump is a high-pressure centrifugal fire pump designed for reliable water supply in fire protection systems where elevated discharge pressure is required. Its vertical in-line structure with stainless steel stage casing and coaxial motor mounting reduces installation space while delivering stable high-head flow for high-rise buildings, commercial complexes, industrial plants, and municipal fire protection applications.
With flow rates from 3 to 120 L/s and heads from 40 to 250 m, the pump can be configured with the appropriate number of stages according to project-specific hydraulic requirements. Stainless steel impellers and diffusers ensure corrosion resistance in standby service, and mechanical seal, vertical motor and complete fire pump set configurations are available for different system designs and local fire code compliance.
Each pump is performance tested before shipment, and technical documentation, dimensional drawings and selection support can be provided for project evaluation.
Main Structure And Working Principle Of Gdl Fire Multistage Pump
Vertical Multistage Pump Body
The pump adopts a vertical in-line structure with identical suction and discharge ports on the same horizontal centerline, allowing direct installation onto the pipeline. The stage casing, suction section and discharge section are connected by long tie rods, with stainless steel stage cans between each impeller stage forming the pressure-containing flow path.
Multi-Stage Impeller Assembly
Multiple stainless steel closed impellers are mounted in series on a stainless steel shaft, each stage consisting of an impeller and a radial diffuser. Water enters the first stage impeller at the suction end, gains pressure and velocity, then passes through the diffuser where kinetic energy is converted to pressure before entering the next impeller stage, with pressure increasing cumulatively across every stage.
Rotating Shaft & Bearings
The pump shaft is precision-ground stainless steel supported by grease-lubricated rolling bearings housed in the motor bracket. The entire rotor assembly is dynamically balanced to G6.3 grade, ensuring smooth rotation with minimal vibration and long bearing service life exceeding 20,000 hours.
Mechanical Seal
A cartridge-type mechanical seal with silicon carbide vs. silicon carbide faces is installed between the discharge section and bearing housing, with self-flushing from the pump discharge providing lubrication and cooling. This seal design ensures zero external leakage and allows quick replacement without dismantling the pump body.
Drive Motor
A vertical, totally-enclosed fan-cooled (TEFC) electric motor is directly coupled to the pump shaft via a rigid coupling, eliminating belt alignment issues and providing compact, maintenance-free power transmission. The motor is sized with non-overloading power characteristics across the entire pump curve to meet fire code requirements.
Working Principle
When the pump starts, water enters the suction inlet and is guided by the suction bend into the first-stage impeller, where centrifugal force accelerates it outward. The diffuser then redirects flow to the next impeller inlet, and pressure rises stage by stage until the required head is reached at the discharge outlet. The pressure transmitter monitors system pressure continuously, and the pump is started automatically by the fire pump controller on low pressure demand.
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