- +91-9833300056
- sales@numaticpumps.com
- Mumbai, Maharashtra, INDIA
● Pump Type – Centrifugal, Magnetic Drive, Non Self Priming Pump
● Pump Material – PP (Polypropylene)
● Shaft – Ceramic
● O’Ring, Bush & Bearing – Viton, GFT (Glass filled Teflon), Carbon
● Media – Diluted Acidic Solution
● Max Liquid Density – 1.3
● Max Head – Up to 34 Meter
● Max Flow – 620 Liter per Minute
● Inlet & Outlet – 50 mm x 40 mm (Flanged end Connection)
● Motor Specification – High Power Permanent Rare earth Magnets
● Magnet – 5 HP, NFLP, 2800 RPM, 50 Hz, 3 Phase.
● Fluid Temperature – 70° C (Max)
● Seal Type – Sealless
● Impeller – Closed Type
Sealless pumps, as the name suggests, are centrifugal pumps that completely remove the need for dynamic mechanical seals. Unlike conventional pumps, where the shaft is sealed with a mechanical seal to prevent leakage, sealless pumps utilize a static containment shell to form a fully enclosed liquid pathway. This innovative design is driven by magnets, providing a unique and safe solution for handling dangerous, corrosive, or toxic substances without the risk of leakage or emissions.
As a leading Sealless Pumps Manufacturer and Exporter in Mumbai, India, we specialize in providing high-performance pumps engineered for a wide range of industrial applications, from chemical processing to petrochemical operations. Our sealless pumps are known for their strength, low maintenance, and safety advantages, particularly when handling dangerous or sensitive fluids.
A sealless pump is essentially a conventional centrifugal pump, but without the mechanical seal typically used to seal the pump shaft. In a traditional pump, this mechanical seal is prone to wear and tear, eventually leading to leakage. Sealless pumps remove this concern by using a static containment shell around the pump’s wet-end components, ensuring the liquid remains securely enclosed.
The operation of sealless pumps is largely driven by magnetic technology. The pump’s drive mechanism is powered by rare-earth magnets, such as samarium cobalt, which are smaller, more effective, and more economical than traditional materials. These magnets transfer torque through a sealed housing without direct contact between the motor and the impeller, thereby removing the need for a mechanical seal.
Sealless pumps are primarily categorized into two types: Canned Motor Sealless Pumps and Magnetic Drive Sealless Pumps. Both types offer the same core benefits of zero leakage, but their construction and application may differ slightly.
A canned motor sealless pump consists of a centrifugal hydraulic pump coupled to a motor in a one-piece, sealed assembly. The rotor is enclosed within a chamber, with the liquid being contained inside. As the motor turns, it drives the rotor through the liquid, while the pumped fluid serves to cool and lubricate the motor’s bearings. The rotor chamber is designed to be completely sealed, providing an extra layer of protection against potential leaks.
Key features of canned motor sealless pumps:
Completely sealed rotor chamber for leakage protection
Self-lubricating and cooling due to the pumped liquid
Ideal for applications with continuous flow of hazardous materials
Magnetic drive sealless pumps function through a set of magnets that transmit torque from the motor to the impeller without any direct mechanical connection. The motor’s driving shaft is connected to an outer magnet carrier, while an inner set of magnets is attached to the pump impeller shaft inside a containment shell. The magnets on the outer carrier and inner shaft are magnetically linked, enabling the impeller to rotate as the motor turns the outer magnets.
This setup ensures no direct contact between the motor and the impeller, so there is no need for a traditional mechanical seal. This absence of a seal makes magnetic drive sealless pumps ideal for preventing leaks in applications involving volatile or hazardous liquids.
Key features of magnetic drive sealless pumps:
No direct mechanical connection between the motor and impeller
Zero leakage due to magnetically-driven rotation
Ideal for hazardous, toxic, or corrosive liquids
Sealless pumps are specifically designed to address the challenges of handling hazardous, volatile, or chemically reactive fluids. The absence of a mechanical seal offers several key advantages, making them the preferred choice in industries where safety, reliability, and environmental protection are critical.
Sealless pumps provide enhanced safety, especially when working with flammable, toxic, or hazardous substances. With no mechanical seal to wear out, the risk of leaks is minimized, reducing the potential for chemical spills, fires, or exposure to harmful substances. This safety benefit is crucial for industries like pharmaceuticals, chemicals, and petrochemicals, where the integrity of the process is paramount.
Traditional pumps with mechanical seals are prone to leakage over time as the seals degrade due to friction and wear. Sealless pumps eliminate this issue entirely. The liquid is fully contained, and the design ensures that there is no chance of leakage during normal operation. This makes sealless pumps especially suited for systems that handle hazardous liquids such as acids, solvents, or toxic chemicals.
Since sealless pumps do not rely on mechanical seals, which need regular inspection and replacement, the overall maintenance costs are significantly reduced. In fact, sealless pumps are known to run for 2 to 3 years without requiring any maintenance; unless bearings need replacement. This leads to lower operating costs, less downtime, and greater overall efficiency in industrial operations.
Sealless pumps often feature a secondary containment system as an added precaution. In the event of a failure in the primary containment shell, the secondary containment serves as a backup barrier, further reducing the risk of leakage and ensuring environmental protection.
Sealless pumps are designed to handle liquids that are not only hazardous but also often expensive. By eliminating the risk of leaks, sealless pumps ensure that precious fluids are not wasted, resulting in cost savings and improved resource efficiency.
Sealless pumps are used in a variety of industries where safety and leakage prevention are critical. Some of the primary applications include:
Chemical Processing: Handling of corrosive, acidic, and toxic chemicals
Pharmaceutical Industry: Pumping sensitive substances without contamination
Petrochemical and Oil Refineries: Transporting flammable liquids and gases
Food & Beverage: Pumping liquids where sanitation and contamination prevention are key
Water Treatment: Safe handling of chemicals used in water purification
Sealless pumps represent a significant advancement in pump technology, offering reliable and safe solutions for industries handling hazardous, corrosive, or volatile substances. By completely removing the need for mechanical seals, sealless pumps not only offer increased safety and environmental protection but also significantly reduce maintenance costs and downtime. Whether through magnetic drive or canned motor designs, these pumps provide a strong and effective option for industries where sealing integrity is standard.
If you’re looking a accurate, low-maintenance pumping solution for dangerous materials, sealless pumps are the optimal choice. Their innovative design, long operational life, and higher safety make them the preferred solution for many high-risk industrial applications.
Seal-less (or sealless) pumps are a specialised category of centrifugal pumps designed to operate without a dynamic shaft seal. In traditional pumps, a mechanical seal or packing is used where the shaft enters the pump casing to prevent fluid from leaking. Because these seals are the most common point of failure, seal-less pumps eliminate them, creating a hermetically sealed system.
There are two primary types of seal-less pumps: Magnetic Drive and Canned Motor.
1. Magnetic Drive (Mag-Drive) Pumps
Mag-drive pumps use a “coupling” system to transfer power from the motor to the impeller without a physical shaft connection. How it works: An outer magnet assembly is attached to the motor shaft. This outer magnet surrounds a containment shell (a solid barrier). Inside that shell is an inner magnet assembly attached to the impeller. As the motor spins the outer magnets, the magnetic field passes through the shell and pulls the inner magnets, spinning the impeller.
Key Advantage: Because the motor is a standard external motor, it is easier to maintain or replace than a canned motor.
Efficiency: Generally high (85–92%), though they can suffer from “eddy current” losses if the containment shell is metallic.
2. Canned Motor Pumps
In this design, the pump and the motor are integrated into a single, hermetically sealed unit.
How it works: The process fluid itself circulates the motor’s rotor. To protect the motor’s electrical parts (the stator), a thin metal “can” or liner is placed between the rotor and the stator. The stator is on the outside of this can, and the rotor is on the inside, submerged in the fluid.
Key Advantage: They offer double containment. If the inner “can” ruptures, the fluid is still contained by the outer motor housing. They are also quieter and more compact because they lack a separate motor and coupling.
Extreme Conditions: They typically handle much wider temperature ranges (from -100°C to +400°C) than mag-drive pumps.
Why Use Seal-less Pumps?
Zero Leakage: Ideal for “hard-to-seal” fluids. If a fluid is toxic, explosive, or carcinogenic, even a few drops of leakage from a mechanical seal can be a major safety or environmental hazard.
Valuable Fluids: If the fluid is costly (like certain pharmaceutical ingredients), preventing any loss justifies the higher pump cost.
Reduced Maintenance: Roughly 50–80% of all centrifugal pump repairs are due to mechanical seal failure. Eliminating the seal removes the #1 cause of downtime.
Regulatory Compliance: They help plants meet strict EPA (Environmental Protection Agency) or OSHA standards regarding fugitive emissions.
Limitations and Risks
Dry Running: This is the “Achilles heel” of seal-less pumps. The bearings inside are lubricated by the process fluid. If the pump runs dry, the bearings will overheat and fail almost instantly.
Cleanliness: They generally require clean fluids. Solids or particles can get trapped in the small clearances of the containment shell or damage the internal bearings.
Initial Cost: They are significantly more expensive upfront than a standard sealed pump.
Demagnetisation: In mag-drive pumps, if the fluid gets too hot, the magnets can lose their strength (reach their Curie point), causing the pump to decouple and stop working.
Common Applications
Chemical Industry: Acids (Sulfuric, Nitric), bases (Sodium Hydroxide), and solvents.
Refineries: Hydrocarbons and volatile organic compounds (VOCs).
Pharmaceuticals: Pure fluids where contamination from a seal flush must be avoided.
Nuclear/Power: Radioactive fluids or high-temperature heat transfer fluids.
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