Canned Motor Pump
Pumps & Valves
Canned Motor Pump
1. Product Overview
The canned motor pump is a leak-free pump that seals the pump and motor in the same pressure vessel. The motor rotor and pump impeller share a single shaft, separated from the stator by a non-magnetic thin-walled shielding sleeve.
Widely applicable to: Transfer of highly toxic, flammable/explosive, corrosive, radioactive, and precious liquids, such as LPG, refrigerants, toxic chemicals, etc.
Equipment features: Absolute zero leakage, no dynamic seals, compact structure, quiet operation, extremely high safety.
2. Working Principle
The magnetic field generated by the stator passes through the non-magnetic shielding sleeve to drive the rotor; the rotor shaft directly connects to the impeller; the pumped liquid is pressurized and discharged, while part of the liquid circulates inside the motor to remove heat; as the shielding sleeve completely isolates the stator windings from the pumped liquid, absolute zero leakage is achieved.
3. System Classification
By Medium Temperature
| Type | Temp Range | Cooling Method |
|---|---|---|
| Normal temp | -10～100℃ | Internal liquid self-circulation |
| High temp | 100～350℃ | External heat exchanger forced cooling |
| Low temp | -100～-10℃ | Low-temp anti-freeze design |
4. Detailed Technical Parameters
4.1 Key Materials
| Component | Material | Remarks |
|---|---|---|
| Body/Impeller | 304/316L/Hastelloy | Selected by media corrosiveness |
| Shielding sleeve | Hastelloy C/Ti/SS | Thinner is better (0.3～0.5mm) to reduce losses |
| Bearing | Carbon graphite/SiC/PTFE | Lubricated by the pumped liquid |
4.2 Typical Specification Table
| Type | Flow (m³/h) | Head | Power | Temp Range | Applicable Media |
|---|---|---|---|---|---|
| Basic | 1～200 | 5～150 | 0.25～55kW | -10～100℃ | Corrosive, toxic liquids |
| High temp | 1～150 | 5～120 | 1.5～45kW | 100～350℃ | Thermal oil, hot process liquid |
| High pressure | 1～100 | 10～250 | 2.2～55kW | -40～100℃ | LPG/LNG |
Note: Canned pump efficiency is usually 5-10% lower than standard centrifugal pumps; heat generation must be considered.
4.3 Design Conditions & Performance Indicators
| Parameter | Specification |
|---|---|
| Leakage | Absolute zero |
| TRG monitoring | Standard 3 or 6-digit TRG meter for bearing wear/rotor eccentricity |
| Motor temp rise | Strictly controlled, usually with PTC thermistor |
| Noise | ≤70dB(A) |
| Protection class | Motor part IP55+ |
4.4 Electrical Parameters
| Applicable Region | Voltage | Frequency |
|---|---|---|
| China/Russia/Central Asia | 380V | 50Hz |
| Middle East/SE Asia/Africa | 400V / 415V | 50Hz |
| South Korea | 380V | 60Hz |
| Americas (if needed) | 440V / 480V | 60Hz |
5. Core Component Selection
| Component | Common Brands | Features & Applications |
|---|---|---|
| Canned motor | Import/Domestic specialized | Custom design, Class H insulation |
| Shielding sleeve | Custom | Hastelloy for corrosion, 0.3-0.5mm wall thickness |
| Bearing | SiC/Graphite | Wear-resistant, must be compatible with media |
| Heat exchanger | Custom | Essential for high-temp type |
| TRG monitor | Standard | Online condition monitoring, early warning |
6. Typical Application Fields
Petrochemical: LPG, LNG transfer Refrigeration: Freon, ammonia transfer Chemical: Highly toxic, strong corrosive liquids Nuclear: Radioactive water circulation Pharmaceutical: High-purity solvent transfer
7. Design Standards & Certifications
| Standard | Description |
|---|---|
| GB/T 26116-2010 | Canned motor technical conditions |
| API 685 | Sealless pump standard |
| ISO 9001:2015 | Quality Management System |
| CE / EAC / GOST-R | Available upon request |
8. Customizable Options
| Option | Details |
|---|---|
| Body material | 304/316L/Duplex/Hastelloy |
| Cooling method | Self-circulation/Forced external (with cooler) |
| Connection | Flange/Thread |
| Insulation | External insulation layer on body |
| Control system | VFD, PLC interlock |
| Ex-proof req. | Ex-proof canned pump (Ex d IIC T4) |
9. Warranty Terms
| Equipment Status | Warranty Period | Warranty Scope |
|---|---|---|
| New Equipment | 12 Months | Shielding sleeve, bearings, body, motor windings |
| Refurbished Equipment | 6 Months | Shielding sleeve, bearings, body, motor windings |
| Idle Equipment (As-is) | 3 Months | Main functional parts |
Note: Sleeve and bearings are wear parts; damage from media incompatibility is not covered. Final terms subject to contract. All orders include installation guidance and remote debugging.
10. Packaging & Delivery
| Item | Packaging Method |
|---|---|
| Canned pump unit | Wooden box, shock-absorbing |
| Heat exchanger (High temp) | Wooden box |
| Accessories/Instruments | Wooden or carton box |
Container Estimation: Small (≤5kW) approx. 5～10 units/20'GP; Medium (5～30kW) approx. 2～5 units/40'HQ. Installation: On-site guidance (strict wiring/exhaust procedures required).
11. Information Required for Quotation
Medium name, temp, density, volatile?; Flow, discharge pressure, NPSHa; Corrosiveness; Ex-proof?; Local voltage/frequency; Status: New/Refurbished/Idle; Terms: FOB/CIF/DDP; Destination port/address.