Centrifugal Pump
Pumps & Valves
Centrifugal Pump
1. Product Overview
The centrifugal pump is the most commonly used liquid transport equipment in chemical processes. It consists of a pump casing, impeller, shaft, bearing housing, sealing device, and motor. It relies on the centrifugal force generated by the rotating impeller to convert mechanical energy into the static pressure and kinetic energy of the liquid.
Widely applicable to: Chemical raw material transport, circulating water systems, cooling water supply, acid/alkali liquid transport, general corrosive liquid transport, etc.
Equipment features: Simple structure, smooth operation, wide flow range, easy maintenance, can be connected in series for high-pressure transport.
2. Working Principle
The motor drives the impeller to rotate at high speed; the liquid in the pump is thrown from the impeller center to the outer edge by centrifugal force; the liquid enters the volute, converting kinetic energy into static pressure; a low-pressure area forms at the impeller center, drawing in external liquid; the liquid is continuously discharged from the outlet.
3. System Classification
By Structural Form
| Type | Features | Application Scenarios |
|---|---|---|
| Single-stage single-suction cantilever | Simplest, most widely used | General chemical liquid transfer |
| Single-stage double-suction | Double inlet, balanced axial force, large flow | Large flow circulating/cooling water |
| Multi-stage centrifugal | Multiple impellers in series, high head | High-pressure boiler feed, water injection |
| Vertical centrifugal | Small footprint, deep well installation | Submerged pumping, fire water systems |
By Sealing Form
| Type | Features | Application Scenarios |
|---|---|---|
| Packing seal | Simple, slight leakage | Low requirement, clean water |
| Single mechanical seal | Very low leakage | General chemical media |
| Double mechanical seal | Zero leakage, with barrier fluid | Toxic/hazardous, flammable media |
4. Detailed Technical Parameters
4.1 Wetted Parts Materials
| Material | Applicable Media | Remarks |
|---|---|---|
| Cast Iron HT200 | Clean water, neutral liquids | Basic, low cost |
| Cast Steel ZG230-450 | General chemical liquids | Better wear resistance than CI |
| 304 SS | Weakly corrosive organic solvents | Common config |
| 316L SS | Chloride, acetic acid media | Recommended first choice |
| Fluoroplastic lined | Strong acids/alkalis | HCl, H2SO4 etc. |
4.2 Typical Specification Table
| Type | Flow (m³/h) | Head | Speed | Power | Inlet/Outlet Dia |
|---|---|---|---|---|---|
| Single-stage (IH) | 6.3～400 | 5～125 | 1450/2900 | 0.55～75kW | DN32～DN200 |
| Double-suction (S) | 72～6000 | 10～250 | 970/1450 | 15～800kW | DN100～DN600 |
| Multi-stage (D) | 6.3～450 | 50～600 | 1450/2950 | 2.2～450kW | DN40～DN250 |
| Vertical submerged | 2～400 | 5～60 | 1450/2900 | 0.75～55kW | DN25～DN200 |
Note: Final selection depends on the actual operating point; the table shows the range covered by each series.
4.3 Design Conditions & Performance Indicators
| Parameter | Specification |
|---|---|
| Required NPSH | Calculated per point, generally 2～6m |
| Efficiency | 50%～82% (depending on specific speed) |
| Vibration | Per GB/T 3216, ≤4.5mm/s at bearing |
| Noise | ≤85dB(A) (1m from pump) |
| Protection class | IP55 standard, IP56 outdoor |
| Insulation class | F |
4.4 Electrical Parameters
| Applicable Region | Voltage | Frequency |
|---|---|---|
| China/Russia/Central Asia | 380V | 50Hz |
| Middle East/Southeast Asia/Africa | 400V / 415V | 50Hz |
| South Korea | 380V | 60Hz |
| Americas (if needed) | 440V / 480V | 60Hz |
Please specify your local voltage and frequency. Performance curves differ between 50 Hz and 60 Hz — we will select a suitable impeller diameter and speed accordingly.
5. Core Component Selection
| Component | Common Brands | Features & Applications |
|---|---|---|
| Motor | ABB, Siemens, Jiamusi | Standard IP55, Ex d IIC T4 for haz. areas |
| Mech. Seal | John Crane, Burgmann, Sichuan Seal | SiC/SiC: wear-resistant; PTFE bellows: corrosion-resistant |
| Bearing | SKF, NSK, LYC | Ball bearing standard; roller for heavy load |
| Coupling | Kuplex, Domestic elastic | Elastic coupling compensates misalignment |
| VFD | ABB, Siemens, Danfoss | Flow regulation, soft start, energy saving |
Brand preferences can be specified; availability of refurbished units is subject to current inventory.
6. Typical Application Fields
Chemical: acid/alkali transfer, organic solvents, circulating liquids. Water treatment: circulating and cooling water, sewage. Petrochemical: crude oil and product transfer. Metallurgy: pickling-liquid circulation, cooling water. Power: boiler feed water, cooling water circulation.
7. Design Standards & Certifications
| Standard | Description |
|---|---|
| GB/T 3216-2016 | Rotodynamic pumps hydraulic performance acceptance tests |
| GB/T 5657 | Centrifugal pump technical conditions (Class III) |
| ISO 9001:2015 | Quality Management System |
| CE / EAC / GOST-R | Available upon request |
| ATEX | Available for explosive areas |
8. Customizable Options
| Option | Details |
|---|---|
| Wetted parts material | CI/CS/304/316L/904L/Fluoroplastic lined |
| Seal type | Packing/Single mech/Double mech |
| Motor type | Standard/Ex-proof/VFD motor |
| Coupling | Elastic/Diaphragm |
| Baseplate | Common base/Independent base |
| Monitoring | Vibration, temp, leakage alarm |
9. Warranty Terms
| Equipment Status | Warranty Period | Warranty Scope |
|---|---|---|
| New Equipment | 12 Months | Pump body, impeller, shaft, seal, bearings |
| Refurbished Equipment | 6 Months | Pump body, impeller, shaft, seal, bearings |
| Idle Equipment (As-is) | 3 Months | Main functional parts |
Final warranty terms are subject to the contract. All orders include installation guidance and remote debugging.
10. Packaging & Delivery
| Item | Packaging Method |
|---|---|
| Pump Body | Wooden box, fixed anti-collision |
| Motor | Wooden box |
| Coupling/Baseplate | Wooden box |
| Accessories | Wooden or carton box |
Estimated container loading:
Small (≤15kW): approx. 20～30 units per 20'GP. Medium (15～75kW): approx. 5～10 units per 40'HQ. Large (>75kW): break-bulk or flat rack.
Installation: On-site guidance available. Large pump sets can dispatch technicians (travel & accommodation borne by buyer).
11. Information Required for Quotation
Medium name, concentration, temperature, density; solid particles (size, concentration); flow (m³/h) and head requirements; suction conditions (NPSHa); corrosiveness; explosion-proof requirements (zone); wetted-parts material; local voltage and frequency; equipment status (new/refurbished/idle); budget and brand preference; delivery terms (FOB/CIF/DDP); destination port or address.