- +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 traditional centrifugal pump, but without the mechanical seal usually used to seal the pump shaft. In a conventional pump, this mechanical seal is subject to wear and tear, eventually resulting in leakage. The problem is solved by sealless pumps, which have a static containment shell that encloses the wet-end components of the pump to keep the liquid securely contained.
Sealless pumps work due to the main enabler of the magnetic technology. The pump’s drive power comes from rare-earth magnets, such as samarium cobalt, which are smaller, more efficient and cheaper than traditional materials. Magnets transmit torque through a sealed housing, so the motor and impeller do not touch and there is no need for a mechanical seal.
Sealless pumps are mainly divided into two categories: Canned Motor Sealless Pumps and Magnetic Drive Sealless Pumps. Both types offer the same fundamental benefits of zero leakage, though they may be constructed and applied in slightly different ways.
A canned motor sealless pump is a centrifugal hydraulic pump and motor sealed as a one-piece assembly. The liquid is contained within the chamber and the rotor sits within the chamber. The motor spins, driving the rotor through the liquid and the fluid pumped to cool and lubricate the motor bearings. The rotor chamber is completely sealed for an additional measure of protection against any possible leaks.
Features of canned motor sealless pumps are:
Fully sealed rotor chamber for leak protection
Liquid pumped for self-lubrication and cooling
For applications that require a continuous flow of hazardous materials
Magnetic drive sealless pumps utilize a set of magnets to transfer torque from the motor to the impeller without a direct mechanical connection. The motor driving shaft is coupled to an outer magnet carrier, and an inner magnet set is mounted on the pump impeller shaft within a containment shell. The magnets on the inner shaft and outer carrier are magnetically coupled such that the impeller is rotated when the outer magnets are rotated by the motor.
In this configuration, the impeller and motor are not in direct contact so a traditional mechanical seal is not needed. The lack of a seal makes magnetic drive sealless pumps ideal for applications where leaks of volatile or hazardous liquids are to be avoided.
The key features of magnetic drive sealless pumps are:
Impeller connected directly to the motor not mechanically connected
No leakage due to magnetically driven rotation
Best for hazardous, toxic, corrosive liquids
Sealless pumps are specially engineered to handle the problems of handling hazardous, volatile or chemically reactive fluids. The lack of a mechanical seal offers many important advantages and is the main reason they are the preferred solution for industries where safety, reliability and environmental protection are critical.
Pumps without seals are safer, particularly when pumping flammable, toxic or dangerous materials. There is no mechanical seal to wear out. So, the risk of leaks is minimized. The possibility of chemical spills, fires, or exposure to harmful substances is reduced. This safety benefit is particularly critical in industries such as pharmaceuticals, chemicals and petrochemicals where process integrity is paramount.
Traditional pumps that use mechanical seals are prone to leakage over time, as the seals degrade due to friction and wear. Sealless pumps completely avoid this problem. The liquid is completely contained . The design prevents any possibility of leakage under normal operation . This makes sealless pumps particularly suitable for systems handling hazardous liquids such as acids, solvents or toxic chemicals.
The overall maintenance costs are much lower, since sealless pumps do not depend on mechanical seals that require periodic inspection and replacement. In fact, sealless pumps can operate for 2 to 3 years without any maintenance, except for the bearings that require replacement. This results in lower operating costs, less downtime, and overall improved efficiency in industrial operations.
Sealless pumps typically have a secondary containment system as an added precaution. The secondary containment serves as a backup barrier in case of failure of the primary containment shell, thereby reducing the risk of leakage and protecting the environment.
Sealless pumps are used to pump liquids that are not only dangerous but often costly. Sealless pumps prevent the risk of leaks, which can help avoid the waste of valuable fluids. This results in cost savings and better resource utilization.
Sealless pumps are used in a wide range of industries where safety and leakage prevention are critical. Some of the primary applications are:
Corrosive, Acidic and Toxic Chemical Handling in Chemical Processing
Pharmaceutical Industry: Pumping Sensitive Substances Free of Contaminants
Petrochemical and Oil Refineries Flammable Liquids and Gases Transportation
Food & Beverage: Moving liquids with an emphasis on sanitation and contamination prevention
Water Treatment: Correct use of chemicals in water purification
Sealless pumps are a major milestone in pump technology, offering a reliable and safe solution for industries handling dangerous, corrosive or explosive substances. Sealless pumps are free of mechanical seals, thus providing increased safety and environmental protection, as well as significant savings in maintenance costs and downtime. These pumps, whether magnetic drive or canned motor designs, will be a solid and effective choice for industries that typically use sealing integrity.
Sealless pumps provide an accurate and low maintenance pumping solution. This makes them ideal for hazardous materials. Their new design, longer working life and greater 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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