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In the field of pumping corrosive and hazardous liquids, safety is not an option but an absolute necessity. Chemical fluid leaks can cause environmental damage, risks to operators, and costly downtime. The GemmeCotti HTM series was developed to meet these challenges, offering a zero-leak solution thanks to its magnetic drive design.

In this guide, we will explore how it works, its advantages, and how to choose the ideal configuration of HTM centrifugal pumps for various industrial processes.

What is magnetic drive and how does it work?

Unlike traditional pumps with mechanical seals, GemmeCotti HTM series pumps use an innovative design without a mechanical seal. In a magnetic drive pump, there are two magnetic couplings: the outer magnet, mounted on the motor shaft, and the inner magnet, which allows the impeller to rotate and move the fluid.

The two magnetic semicouplings are separated by a containment shell and never come into contact with each other; the inner magnet rotates exclusively through the magnetic field action. The liquid therefore always remains hermetically sealed within the hydraulic part of the pump. This design ensures maximum safety, greater reliability, and excellent efficiency, even in the most demanding applications.

For an even more detailed visual explanation, an explanatory video is available on YouTube showing the operating principle in action.

What are the advantages of HTM magnetic drive pumps?

Choosing a GemmeCotti magnetic drive pump means investing in safety, efficiency, and quality.

The advantages that distinguish these acid pumps are:

• No leaks or emissions: ideal for handling hazardous chemicals. The liquid always remains hermetically sealed inside the hydraulic section of the pump.
• Reduced maintenance: fewer wear components (such as mechanical seals) means lower operating costs, no plant downtime, and long-term savings.
• No motor/pump alignment required: the compact design simplifies installation and reduces vibrations.
• Maximum reliability: solid construction made of chemically resistant materials (PP, PVDF, AISI 316). HTM series centrifugal pumps are the ideal solution for long-lasting performance, even in heavy-duty conditions.
• Long-term savings: pumps designed to last for decades.
• High-torque magnetic coupling: these pumps are designed to ensure high torque of magnetic couplings.

Performance and materials: a tailor-made solution for every need

Every industrial application has different requirements. For this reason, the HTM range, from size 4 to 100, offers wide operational flexibility.

Technical specifications

• Flow rate: From 0.5 to 130 m³/h (2–528 USGPM)
• Head: Up to 48 meters (148 ft)

Chemical compatibility

The choice of material in contact with the liquid is essential for pump durability:

• PP (Polypropylene): Excellent for many liquids such as phosphoric acid, ammonia, and caustic soda.
• PVDF (Polyvinylidene Fluoride): Ideal for aggressive acids such as sulfuric acid, hydrofluoric acid, sodium hypochlorite, and many others.
• AISI 316: Stainless steel suitable for fluids such as diesel, acetone, ethyl alcohol, hydraulic oils, and many others.

In addition to thermoplastic versions, HTM pumps can also be manufactured in AISI 316 stainless steel. This configuration is particularly suitable for demanding industrial applications requiring high mechanical and thermal resistance. The robustness of steel, combined with the safety of magnetic drive technology, makes these pumps the ideal choice for transferring hydrocarbons and solvents with total absence of leaks.

Technical specifications (AISI 316 Version)

• Flow rate: From 0.8 to 32 m³/h (3–175 USGPM)
• Head: Up to 24 meters (110 ft)

Discover the complete range and specifications of HTM magnetic centrifugal pumps in AISI 316.

For explosive environments, ATEX Zone 1 and 2 versions are also available (Models EM-C PP/PVDF and EM-C AISI 316).

The GemmeCotti team is available to help customers select the pump best suited to their application.

Contact us at info@gemmecotti.com for a free quotation.

When handling acids and dangerous liquids, safety and reliability are not optional. For industries that depend on the safe transfer of corrosive materials, finding the right chemical pump is a critical decision. GemmeCotti has been the Italian specialist in this field since 1992, engineering advanced mag drive pumps designed for total safety and efficiency. Our innovative mag drive systems represent the pinnacle of leak-proof technology.

How does the magnetic drive design work?

The most significant vulnerability in a conventional pump is the mechanical seal, which is the most frequent source of dangerous leaks and costly maintenance. GemmeCotti’s technology solves this problem with a special sealless magnetic drive design.

So, how does it work? The principle is simple:

• An external magnet on the motor shaft transmits torque through a stationary rear casing.
• This drives an internal magnet, which is hermetically sealed inside the
  chemical pump.
• The internal magnet is connected to the impeller, which moves the fluid.
• The rear casing acts as a solid, leak-proof barrier between the hazardous liquid and the atmosphere, resulting in a hermetically sealless design that offers total fluid containment.

This core design is what makes mag drive pumps the superior choice for difficult applications.

Key advantages of our mag drive design

The innovative design of our mag drive systems offers tangible benefits for any operation requiring a high-performance chemical pump.

• 100% leak-proof performance: our pumps guarantee zero leakage of chemicals and fugitive emissions. This ensures total operator safety and protects the environment from hazardous spills.
• Drastically reduced maintenance: with no mechanical seals to wear out or replace, maintenance costs and process downtime are minimized.
• High reliability: the simple, robust design of our mag drive pumps leads to a longer service life and dependable performance, even when handling corrosive and dangerous liquids.
• Simplified installation: the magnetic coupling removes the need for time-consuming pump-motor alignment, saving time and preventing common installation errors.
• Efficient power transfer: a high-torque magnetic coupling ensures that power is transferred from the motor to the pump smoothly and effectively.

Choosing the right chemical pump: our range of mag drive pumps

To meet the diverse needs of chemical handling, GemmeCotti offers a wide range of mag drive pumps, with each design engineered to provide a reliable and efficient solution.

• Mag-drive centrifugal pumps: these are the ideal choice for most standard to high-flow chemical transfer and processing applications where reliability and efficiency are paramount.

• Mag-drive turbine pumps: suitable for chemical handling in applications requiring relatively low flow and high head. Turbine pumps are reversible and can pump low-viscosity fluids also containing up to 20% entrained gas.

• Mag-drive rotary vane pumps: these are specialized anti-corrosion industrial pumps suitable for pumping a variety of fluids, including hydrocarbons, solvents, heat transfer oils, refrigerants, and even cryogenic or radioactive liquids. These pumps are designed for tasks requiring high pressure at low flow rates, delivering the smooth and steady performance needed for dosing, sampling, and circulation

Trust GemmeCotti for your mag drive pump needs

For a safer, more reliable, and low-maintenance pumping solution, trust the Italian specialists in sealless magnetic drive technology. If your application demands a chemical pump with zero-leak capabilities, our mag drive systems are the perfect choice.

We are ready to find the perfect pump for your needs. Contact us for a free quotation or more information at info@gemmecotti.com or call +39 02 96460406.

In any industrial plant, overall efficiency also depends on the ability of each component to operate without interruption. An air-operated double diaphragm pump is no exception; it is the heart of many fluid transfer processes. GemmeCotti has designed and built the ideal pump for this need.

GemmeCotti HAOD Air-operated double diaphragm pump

The HAOD pump is a positive displacement pump that uses compressed air as its power source. Inside, two flexible diaphragms move, creating an alternating suction and discharge action. This simple yet effective design allows for the transfer of a wide variety of fluids, from clean, low-viscosity liquids to slurries and liquids containing solids.

Choosing the right model means guaranteeing operational continuity. GemmeCotti’s HAOD series pumps, born from consolidated Italian engineering experience, are designed with three fundamental aspects in mind that make them the ideal choice for the most demanding applications.

1. Total operational reliability

The design goes beyond the individual component, considering the entire product from the outset—a cornerstone for achieving total reliability.

• Advanced anti-stall pneumatic circuit: at the core of our pumps is a proven and efficient anti-stall pneumatic circuit, which ensures smooth and safe operation, even at low air pressures or in slow cycles. This design prevents blockages and ensures constant operation.
• Dry-running capability: HAOD pumps can run dry for extended periods without sustaining any damage. This is a crucial advantage for process safety, especially in applications such as drum unloading or tank emptying, where the pump can continue to work even after the liquid has run out.
• Robustness against closed discharge: unlike other positive displacement pumps, GemmeCotti HAOD pumps can operate with a closed discharge without problems, increasing safety and operational flexibility within the plant.

2. Intrinsic safety: the best choice for critical environments and hazardous fluids

When handling aggressive or flammable liquids, safety is not an option. HAOD pumps are intrinsically safer for these applications.

• ATEX certification: the HAOD series is available in an ATEX-certified version, making it suitable for installation in areas with potentially explosive atmospheres.
• Ideal for aggressive liquids and solvents: thanks to their pneumatic operation, they are the perfect solution for pumping solvents and flammable fluids, a fundamental requirement in the chemical and petrochemical industries.

3. Versatility and superior chemical compatibility

Every application has its challenges. That’s why we have designed a versatile industrial pump capable of adapting to different fluids and conditions.

• Wide choice of construction materials: chemical compatibility is guaranteed by a comprehensive selection of materials, making the HAOD a corrosion-resistant pump ideal for every need:
  • Polypropylene (PP) pump: an excellent choice for a wide variety of acids and bases. It is the most common solution for an acid pump.
  • PVDF pump: offers superior chemical and thermal resistance for the most aggressive fluids and for temperatures up to 95°C.
  • AISI 316 stainless steel pump: Perfect for applications requiring high mechanical strength or compliance with specific standards, such as in the food and pharmaceutical sectors.
• Self-Priming pump: HAOD pumps have excellent dry suction capability, making them outstanding self-priming pumps for drawing fluid from significant heights.
• Handles solids and viscous fluids: their design enables them to pump abrasive, viscous, and solids-containing fluids without damage, making them the ideal solution for slurries and particle-laden liquids.

Reliability, safety, and versatility are the hallmarks of GemmeCotti HAOD diaphragm pumps.

For technical advice specific to your application needs, please contact GemmeCotti directly (info@gemmecotti.com).

GemmeCotti, manufacturer of high-quality chemical pumps, boasts a line of accessories designed to optimize performance, improve safety, and extend the life of your pumping systems. For industries that rely on the safe and efficient transfer of corrosive and hazardous fluids, having the right components is of paramount importance. GemmeCotti’s selection of accessories ensures that your magnetic drive pumps and other chemical industry pumps operate at their best. 

Here is a detailed look at the accessories GemmeCotti offers:

Dry Running Protection Device

The dry-running protection device protects the pump from damage caused by overload, insufficient flow, or dry running. This essential accessory monitors the pump’s operational status and automatically shuts down the motor in the event of dry running, a closed delivery line, or a blocked suction line. This tool, in fact, monitors the motor’s absorption and interrupts the power supply if the set operating thresholds are exceeded. This preventive measure can save significant costs in repairs and downtime, making it a valuable addition to any operation involving chemical pumps. 

Main features: 

• Single Phase CURRENT RELAY
• Multirange 15-35A
• 2 set points MAX/min
• Also for motors with INVERTER
• Direct insertion TA through
• LCD Display

Baseplates

Proper installation is fundamental to the longevity and efficiency of any pump and motor assembly. To ensure a stable and perfectly horizontal foundation, GemmeCotti provides two distinct types of baseplates, designed to meet different operational needs.

• Baseplates in PP (Polypropylene): GemmeCotti baseplates for horizontal pumps are made of PP and they are suitable for motors B3/B5 IEC and NEMA from 0,12 kW to 4 kW.
  The baseplates are available in 3 different dimensions (type “A”, type “B” and type “C”).

• Metallic UPN baseplates: We can supply UPN baseplates as an optional for our chemical horizontal pumps, both magnetic drive (PP/PVDF/AISI 316) and mechanical seal (PP/PVDF). These baseplates provide added rigidity and ensure a secure, long-lasting installation for your chemical pumps.

Flanges

GemmeCotti pumps are normally supplied with threaded connections. On request, we can also provide DIN or ANSI flanges for our thermoplastic pumps ( flat stub + free flange), and for AISI 316 pumps, we supply welded DIN or ANSI flanges.

Suction strainers for vertical pumps

To protect your vertical pumps from solids and debris that can cause internal damage and lead to premature wear, GemmeCotti offers specially designed suction strainers. These 200mm long strainers are easily installed on the pump’s suction port, providing an effective barrier against contaminants and ensuring the smooth operation of your vertical pumping systems.

Corrosion-Resistant PVDF Bolts and Nuts

GemmeCotti’s accessory range includes a variety of bolts and nuts designed for maximum durability. Available in different sizes, these fasteners are engineered to resist corrosion and are perfectly compatible with the aggressive chemicals commonly found in industrial applications. This ensures a secure and long-lasting assembly, guaranteeing optimal performance even in the most demanding environments.

Sizes: 

M16x110
Max tightening torque: 15 Nm
Material: PVDF

M12x50
Max tightening torque: 7 Nm
Material: PVDF

M10x25
Max tightening torque: 4,5 Nm
Material: PVDF

Diaphragm seal pressure gauges

Accurate pressure monitoring is crucial for both safety and process control. GemmeCotti’s diaphragm seal pressure gauges are designed to provide reliable readings while being protected from the aggressive media being pumped. Available in both polypropylene (PP) and PVDF, these gauges ensure that corrosive fluids do not come into direct contact with the sensitive pressure measurement instruments.

High-Precision PT100 Thermoprobe for ATEX environments

For applications in potentially explosive atmospheres (ATEX Zone 1), precise temperature monitoring is a critical safety requirement. The PT100 thermoprobe offered by GemmeCotti is a high-precision temperature sensor that allows for the safe and accurate monitoring of pump temperatures in these demanding environments.

Spare Parts Kits (Wet End and Rear Wet End)

To minimize downtime and simplify maintenance, GemmeCotti offers spare parts kits. The WE (Wet End) and RWE (Rear Wet End) kits include all the necessary components that come into contact with the pumped fluid. Having these kits on hand allows for quick and efficient replacement of wearable parts, ensuring that your mag drive pumps and other chemical pumps are back in service with minimal interruption.

GemmeCotti offers a wide variety of accessories that can be supplied together with our industrial pumps to provide a complete and reliable solution for your specific needs.
For more information and to find the perfect components for your application, please do not hesitate to contact us at info@gemmecotti.com. We also invite you to visit our website to explore the full range of accessories: https://gemmecotti.com/accessories/.

At GemmeCotti, we specialize in designing and manufacturing high-quality chemical pumps for a wide range of industrial applications. Our commitment to innovation and excellence has led to the development of a comprehensive range of pumps, including our renowned self-priming mag drive pumps, designed to handle even the most corrosive and dangerous liquids safely and efficiently. 

We are excited to introduce the latest addition to our pumps: the new self-priming magnetic drive turbine pump HTT-SP 12000.

Characteristics and advantages

The new HTT-SP 12000 offers a flow rate of up to 7 m³/h and a head of up to 36 m, making it one of the most efficient pumps in its class. This latest innovation is proof of our continuous dedication to meeting the evolving needs of our customers.

A key feature of the HTT-SP 12000 is its self-priming capability. The pump can achieve a suction lift of up to 5 meters with water at ambient temperature, ensuring reliable and consistent operation, even in challenging conditions. The pump casing is made from a solid block of PP, while the impeller is constructed from PVDF, guaranteeing maximum chemical resistance and durability when handling aggressive liquids.

Technical specifications

• Available materials: the casing is machined from a solid PP block, with a PVDF impeller.
• Materials in contact with the liquid:
  • Pump o-ring: EPDM (standard for PP pumps) / VITON (standard for PVDF pumps)
  • Static shaft: ceramic Al₂O₃ 99.7%
  • Bearing: PTFEC
• Maximum flow: 7 m³/h
• Maximum head: 36 m
• Maximum temperature: PP 60°C – PVDF 90°C
• Maximum viscosity: 45 cPs
• Pressure rating: NP 5

The HTT-SP 12000 is equipped with a range of features designed to deliver optimal performance and longevity. These include:

• High-torque magnetic coupling: ensures a reliable and leak-free functioning, a defining feature of our mag drive pumps.
• Chemically resistant bearings: The PTFE/carbon sleeve bearings provide excellent resistance to chemical corrosion, extending the pump’s service life.
• Direct starting motors: for simple and efficient operation.

Optional and customizations

To provide a complete and customized solution, we also offer a variety of optional accessories for the HTT-SP 12000, such as DIN or ANSI flanges and a custom baseplate. You can explore all the available options on our accessories page to create the perfect pump configuration for your needs.

Furthermore, for applications in potentially explosive atmospheres, the pump is also available in an ATEX version for use in Zone 2 areas (model EM-T SP PP/PVDF).

The new mag-drive turbine pump model HTT-SP 12000 is more than just a pump; it’s a solution engineered for reliability, performance, and safety. Whether you are in the chemical, pharmaceutical, or water treatment industry, our chemical pumps are designed to meet your specific needs.

To learn more about the new self-priming mag drive turbine pump model HTT-SP 12000 and to explore our full range of self-priming and mag drive turbine pumps, we invite you to discover the HTT-SP series on our website or to contact us for more information at info@gemmecotti.com.