QD Series Horizontal Multistage Centrifugal Pump | RFQ Sourcing Details

The QD series is a horizontal, motor-driven multistage centrifugal pump range intended for high-pressure water transfer and circulation duties.

Listed uses include boiler-water feed, municipal and industrial water supply, pressure boosting, cooling and air-conditioning systems, water treatment, irrigation, cleaning systems, mine-water transfer, and selected oil or corrosive-liquid services. Published performance varies substantially by model.

The listed range covers 3.75–500 m³/h flow and 15.78–684 m head. Most listed models operate at 2,950 r/min, while the higher-capacity QD280 and QD450 groups are listed at 1,480 or 680 r/min. Listed motor powers range from 4 to 1,050 kW.

Available supply voltages are stated as 220, 380, 400, 415, 440, and 480 V, and the driver may be an electric motor or diesel engine. The pump uses a closed impeller, horizontal shaft arrangement, combined horizontal split casing, and single-suction inlet configuration.

Shaft-seal options are listed as mechanical seal or packing seal. Stage count and impeller diameter may be adjusted to meet different duty requirements, and OEM customization is available. Medium limits depend on the selected construction and service.

General watery liquids are listed for operation below 80°C without solid particles. Boiler-feed or hot-water service is listed below 105°C without solid particles. Mine water or similar sewage may contain up to 1.5% solids, with particle diameter below 0.5 mm in one stated condition, at temperatures below 80°C.

Corrosive-liquid and oil-service configurations require changes to materials, seals, or cooling arrangements. Listed oil-service limits are -20°C to 150°C and viscosity up to 120 c.

St;the applicable corrosive-liquid temperature limit should be confirmed for the selected configuration because different limits appear in the available product details.

Model selection should be based on the required flow, total dynamic head, liquid composition, temperature, viscosity, solids content, suction conditions, operating schedule, power supply, seal preference, and installation environment.

Buyers should request the exact performance curve and construction schedule for the proposed model rather than selecting only from the overall series range.

Before procurement, confirm the precise QD model, guaranteed duty point, efficiency, motor rating, voltage and frequency, materials of wetted components, seal arrangement, allowable inlet conditions, flange details, rotation, controls, and outdoor protection.

Also confirm the final dimensional drawing, package dimensions and weight, applicable certification documents, inspection requirements, spare-parts scope, warranty terms, and customization details.

Warranty information in the available product details is inconsistent, so the contract should state the agreed coverage and duration explicitly.