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Multi-stage Centrifugal Pump Manufacturing Process

Release time：2026-03-11

The manufacturing of multistage centrifugal pumps is guided by the core principles of “high precision, high strength, high reliability, and low loss,” strictly adhering to mechanical manufacturing industry standards and comprehensive quality control procedures across the entire process. The process covers eight key stages: design preparation, material control, core component fabrication, rotor assembly, complete machine final assembly, performance testing, surface treatment, and factory acceptance inspection. Each step is subject to precise control and critical‑point inspections to ensure that the products are well suited for a variety of complex operating conditions, including industrial conveying, mine dewatering, and chemical media transportation, thereby achieving long‑term stable, highly efficient, and energy‑saving operation.

I. Design and Process Preparation

Based on operating condition parameters, complete whole-machine modeling and optimization as well as performance simulation, clarify machining processes, acceptance criteria, and core process parameters, and prepare process guidance documents to ensure production standardization.

2. Material Selection and Control

Select high‑quality materials that are well suited to the operating conditions; provide certificates of compliance for all raw materials and conduct individual re‑inspection of critical materials; store materials by category and implement protective measures, while performing pre‑treatment to remove impurities and relieve internal stresses, thereby enhancing machinability.

3. Precision Manufacturing of Core Components

(1) Impeller Manufacturing

Precision-forged billets undergo rough machining to relieve stress, followed by fine machining to control dimensions and surface roughness (Ra ≤ 1.6 μm), then polishing and, as required, anti-corrosion treatment. After passing non‑destructive testing, they are transferred to the next process.

(2) Guide Vane Manufacturing

Precise material cutting and forming, followed by fine machining of the flow channels and sealing surfaces to ensure mating accuracy; after deburring and polishing, the components are inspected and deemed合格 before proceeding to assembly.

(3) Manufacturing of Shaft Assembly Components

The alloy forgings undergo heat treatment (hardness HRC 28–35), followed by precision turning and grinding to control the journal accuracy (roundness ≤ 0.02 mm, Ra ≤ 0.8 μm). After passing non‑destructive testing, they are assembled.

(4) Hull and Segment Fabrication

Precise cutting and forming, followed by stress-relief annealing after standardized welding, then fine machining of the flange face (flatness ≤ 0.03 mm) and sealing grooves; after passing inspection, the product is transferred to the next process.

4. Rotor Assembly

Pre‑assemble components such as the impeller and shaft sleeve, adjust clearances, precisely secure the impeller to control coaxiality, perform rotor dynamic balancing to a precision of G4.0 or higher, and proceed to the next stage only after re‑inspection confirms compliance with standards.

5. Complete Machine Assembly

Level and secure the base, then assemble the hull segments. Install the rotor and adjust the mating clearances, followed by the installation of bearings, seals, and accessories. Manually rotate the assembly to identify and rectify any assembly defects.

6. Performance Testing and Trials

Conduct the hydrostatic test at 1.5 times the design pressure, and perform no‑load and load tests to verify all relevant parameters (bearing temperature rise ≤ 40°C), ensuring compliance with standards and zero leakage; retest after rectifying any non‑conforming items.

7. Surface Treatment and Packaging

Perform rust removal and anti-corrosion treatment on the entire machine, apply a protective coating, use moisture‑ and shock‑resistant packaging materials, and provide individual protection and clear labeling for vulnerable components.

8. Factory Acceptance Testing

Conduct a comprehensive reinspection of the entire machine’s quality and performance, compile all relevant documentation, issue a certificate of conformity before release, and ensure that the product is ready for direct deployment.

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