CENTRIFUGAL PUMP D 4000-95-2
The centrifugal pump D 4000-95-2-C and the electro-pump unit based on it are designed for pumping water and liquids with properties similar to water in terms of viscosity and chemical activity, at temperatures up to 85 ºC, containing solid particles not exceeding 0.05% by mass, with a maximum particle size of 0.2 mm and microhardness not exceeding 6.5 MPa (650 kgf/mm²).
The pumps are manufactured in the UHL climatic version — intended for macroclimatic regions with moderate and cold climates, placement category 4 — operation in rooms (spaces) with artificially controlled climatic conditions in accordance with GOST 15150-69.
APPLICATION OF PUMP D 4000-95-2
The D 4000-95-2 pump belongs to the general-purpose pump group and is designed for pumping water and liquids with properties similar to water in terms of viscosity and chemical activity, at temperatures up to 85 °C, containing solid particles not exceeding 0.05% by mass, with a maximum particle size of 0.2 mm and microhardness not exceeding 6.5 MPa (650 kgf/mm²). It is used in various industries, agriculture, heating systems, and municipal water supply systems, among others.
Technical Characteristics
Nominal parameters of the D 4000-95-2 pump and its versions depend on the impeller outer diameter and rotational speed.
This is an important parameter that must be considered when designing the external network (piping system and fittings) and selecting pumping equipment.
Overall dimensions and weight of the D 4000-95-2 pump and its versions also depend on the impeller outer diameter and rotational speed.
Drive options: synchronous and asynchronous three-phase electric motors are used depending on the impeller diameter and rotational speed.
Overall efficiency (η): ranges from 83% to 85%.
Main Requirements for Pump Design
- High reliability and efficiency
- Extended operating range through impeller trimming and speed variation
- Long service life — average time between overhauls not less than 45,000 hours (with proper maintenance)
- Dynamic stability across all operating modes
- Stable, continuously decreasing head curve to ensure reliable operation in parallel configurations
- Proper selection of materials for main components to ensure required service life under operating conditions
- High level of standardization
- Ease of assembly, disassembly, maintenance, and high repairability
Design Features of D 4000-95-2 Pump
- Horizontal design: provides high vibration resistance, reduces shaft misalignment risk, and extends component lifespan
- Volute type with horizontal split along the pump axis: ensures easy maintenance, installation, and operation; suction and discharge nozzles located at the bottom allow assembly/disassembly without disconnecting pipelines
- Single-stage with double-suction impeller
- Pump casing: complex cast iron structure consisting of two parts (upper cover and lower casing) with semi-spiral inlet and spiral outlet channels; includes suction/discharge nozzles, support feet, and leakage collection brackets
- Rotor assembly: consists of shaft, impeller, inlet and protective sleeves, bearings, fastening elements, and half coupling; axial positioning ensured by sleeves and lock nuts
- Double-suction impeller reduces axial load and improves cavitation performance
- Rotor bearings: external rolling bearings; drive side — spherical roller bearing (radial loads), opposite side — spherical roller bearing (radial and residual axial loads); grease-lubricated, air-cooled
- Sealing: stuffing box type with hydraulic seal supplied with sealing liquid
- Torque transmission: via flexible pin-and-bush coupling
Overall and Mounting Dimensions Drawing
Drawings include overall and mounting dimensions of the D 4000-95 pump and pump unit (pump + electric motor on base/frame). They show:
- Main dimensions
- Support locations and mounting dimensions on the base (center distances, fixing points, seating dimensions)
These are required for foundation preparation, installation, and pipeline connection. All data is provided according to the technical паспорт and is used in design, installation, and maintenance.
SUCTION AND DISCHARGE NOZZLE DIMENSIONS
The drawing shows the connection dimensions of the D-series water pump nozzles (flanges) — including main diameters, bolt circle parameters, as well as the number and diameter of fastening holes. This data is used for manufacturing mating flanges, selecting gaskets and fasteners, and ensuring proper alignment and installation of pipelines on the suction and discharge lines. The drawing helps prevent misalignment and ensures correct centering of connections.
GRAPHICAL CHARACTERISTICS
The graph presented in the technical паспорт of the D 4000-95 pump shows its operating range and the operating (design) point. The operating range defines the recommended flow range where the pump operates stably and with maximum efficiency — with optimal efficiency and acceptable loads.
The operating point corresponds to the nominal operating mode (combination of flow rate and head), which is used for selecting the electric motor and verifying system parameters, including power consumption and required Net Positive Suction Head (NPSHr).
