QD Series Horizontal Multistage Centrifugal Water | RFQ Sourcing Details

The QD series is a horizontal, sectional-casing multistage centrifugal pump range designed for applications requiring model-dependent combinations of flow and head. Published series data covers flow rates from 3.75 to 720 m³/h, electric motor power from 4 to 1,600 kW, and 2 to 12 stages depending on the selected model.

Individual models in the provided performance table operate at either 1,480 or 2,950 r/min;the QD450-60 entry is listed at 680 r/min. The highest head shown in that table is 684 m, although a separate listing field states a maximum head of 1,323 m.

Buyers should resolve this difference against the selected pump curve before specifying equipment. The standard construction is listed as cast iron, with electric starting and an electric motor connected through an elastic coupling. Mechanical and packing shaft seals are selectable.

Suction and discharge use flange connections, and customized materials, seals, filters, cable lengths and dwell time are offered. A motor-and-diesel-engine driving-type field also appears in the product data, so the exact driver arrangement must be confirmed for each quotation.

Stated duties include water supply and boosting, municipal water and sewerage projects, boiler feed, cooling and air-conditioning systems, irrigation, water treatment, cleaning, and selected mine-water, corrosive-liquid, oil and petroleum-product transfer services.

These services are not interchangeable standard capabilities.

The stated operating limits vary by medium: particle-free watery liquids below 80°C;boiler-feed or hot-water-like media below 105°C;mine water or similar sewage with solids content below 1.5% and temperature below 80°C;particle-free corrosive liquids within a stated range of -20°C to 105°C;and particle-free oils or petroleum products from -20°C to 150°C with viscosity below 120 c.

St. Another description gives a corrosive-liquid limit up to 150°C, creating a second discrepancy that requires written confirmation.

Before procurement, specify the required duty point, liquid composition, solids content and particle size, temperature, viscosity, seal arrangement, construction materials, flange details, motor voltage, frequency, power supply, installation environment and control method.

Request the exact model performance curve and verify head, flow, efficiency, motor rating, speed and stage count at the intended operating point.

Also confirm whether outdoor placement requires the described motor rain cover, whether a cooling system is needed, and what testing documentation, accessories and customization are included. The listed warranty period is one year, but its scope and starting date should be confirmed in the purchase documentation.