Reverse Circulation Canned Motor Pump

Reverse Circulation Canned Motor Pump

Precision Reverse Circulation Canned Motor Pumps are engineered for applications requiring enhanced reliability, motor cooling, and process efficiency—particularly in systems involving hazardous, toxic, or volatile liquids. These pumps are based on our advanced sealless technology developed with Nikkiso Co., Ltd., Japan, and are equipped with an integrated reverse circulation system to ensure optimum performance. In this design, a portion of the pumped fluid is routed through a reverse circulation line, passing through the motor chamber to cool the motor windings and lubricate the bearings before returning to the suction vessel. This closed-loop arrangement eliminates the need for mechanical seals and external cooling systems, offering a completely leak-proof and maintenance-friendly solution.

CASING

• • Axial suction and top discharge
• • Optimized hydraulic design with smooth flow passages
• • Reverse circulation connection integrated into casing design

IMPELLER

• • Enclosed or semi-open type
• • Dynamically and statically balanced
• • Designed for stable operation under reverse circulation flow conditions
• • Auxiliary impeller for bearing lubrication and internal cooling

SHAFT

• • High-precision stainless steel
• • Supported by ceramic/carbon graphite sleeve bearings
• • Built-in passageways to allow motor cooling liquid to flow through rotor area

ELECTRIC MOTOR

• • Canned motor, 2/4 pole, 3 phase, 415V, 50 Hz
• • Insulation class F, H, or C
• • Designed to operate in submerged conditions with internal cooling by pumped fluid
• • Explosion-proof and flame-proof options available

FEATURES

• • Sealless, hermetically sealed design with reverse circulation
• • Internal motor cooling and bearing lubrication through circulated process liquid
• • Reverse line connected to suction vessel vapor zone for efficient return
• • Flow meter and valves for monitoring and regulating reverse circulation
• • Protection systems: Dry run, overload, temperature, and wear detection

MATERIAL OF CONSTRUCTION

• • Casing & Impeller: Stainless Steel, CF8M, CF3M
• • Stator Liner & Rotor Sleeve: Hastelloy, INCONEL, SS316L
• • Bearings: Ceramic, Carbon graphite
• • Thrust & Shaft Sleeves: Tungsten Carbide / SS316L with HCR/Ceramic coating

ADVANTAGES

• • Reliable motor cooling with reverse circulation
• • Suitable for high-temperature, high-pressure, or hazardous fluids
• • Zero leakage and minimal maintenance
• • Enhanced equipment life due to integrated thermal management

APPLICATIONS

• • Chemical Transfer Systems
• • Cryogenic and LNG Systems
• • Nuclear & Hazardous Environments
• • Pharmaceutical & Fine Chemical Manufacturing
• • Pressurized and Heat-Sensitive Fluid Handling

TECHNICAL RANGE

• • Delivery size: Up to 250 mm
• • Capacity: Up to 1000 m3/hr
• • Head: Up to 135 m
• • Temperature Range: -40°C to +270°C
• • Working Pressure: Up to 120 Kg/cm²
• • Speed: 1500 / 3000 RPM (Synchronous)
• • Voltage: 415V, 50 Hz, 3 Phase

Precision Sealless Pump’s Reverse Circulation Canned Motor Pumps offer a leak-free, safe, and efficient solution for critical applications that demand precise thermal control and absolute reliability.

Reverse Circulation Canned Motor Pump is a specialized pump design where the fluid flows in reverse circulation to enhance cooling and efficiency, often used in handling hazardous or temperature-sensitive fluids.