GemmeCotti world

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 system 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 system.

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 systems

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.

GemmeCotti plastic pumps for acids and dangerous liquids

GemmeCotti has been producing pumps for acids and dangerous liquids for over 30 years in special materials: plastic pumps are mainly made of PP (polypropylene) or PVDF and stainless steel pumps are mainly made of AISI 316. The use of these materials ensures compatibility with a wide range of liquids such as acids, bases, oils, alkalis, refrigerants and fuels. 

In this article, we will focus on the plastic materials used for the complete range of our chemical pumps. We will analyze their main features and discover why plastic pumps are especially suitable for pumping corrosive and dangerous liquids such as sulfuric acid, sodium hydroxide, hydrochloric acid, acetone, cleaners, petrol, diesel, phosphoric acid and seawater.

Most of the PP and PVDF injected plastic parts used in GemmeCotti pumps are manufactured by Gemme Plast, a part of the GemmeCotti group, which specializes in the injection molding of plastic materials. 

Features of the plastic materials 

Our pumps are often used with fluids that can be corrosive and very aggressive, so it’s very important to use highly resistant and compatible plastic pumps. The pumps made of plastic materials are: 

Polypropylene [PP] pumps

PP (Polypropylene) is the main plastic material we use for our pumps. It is one of the most common polymers and, historically, one of the first to be used in industry.
Polypropylene was discovered in 1954 by Italian chemical engineer Giulio Natta, following the work of Karl Ziegler in Germany. Their innovative studies on stereospecific polymerization, which led to the discovery of crystalline polypropylene, earned them the Nobel Prize in Chemistry in 1963.
PP is highly resistant and therefore can be used with many fluids like caustic soda (or sodium hydroxide) and acid liquids. Polypropylene is reinforced with other materials like glass fiber and talc to make it more mechanically resistant and to ensure a higher resistance to pressure.
Polypropylene is perfect for obtaining injection molded parts, and the pumps made of this material can safely withstand fluid temperatures of about 60-70°C.

Plastic pumps in PVDF 

The second most important material we use for GemmeCotti plastic pumps is PVDF, which is a fluoropolymer, i.e., a technopolymer with advanced properties. Its composition makes it chemically inert to most chemicals. Since this kind of plastic is difficult to synthesize and is used in more limited and specialized sectors, it costs more than PP. However, It is significantly more resistant to high temperatures compared to polypropylene and it can be used at higher temperatures, up to 90°C.
This material too is reinforced to increase its mechanical resistance. 

How to choose the most suitable pump material

In order to decide whether PP, PVDF or stainless steel AISI 316 is the most suitable material you must:

• first, know the liquid that has to be pumped, which is in contact with the pump and verify its compatibility. You can use the GemmeCotti chemical compatibility chart available at this link;
• and then know the temperatures of the liquids to be pumped. Polypropylene is the most suitable plastic material for liquids with maximum temperatures of 60-70°C, while PVDF is preferred for temperatures up to 90 ºC.  When the temperature of the liquid exceeds 90 ºC, you can check its compatibility with stainless steel AISI 316, a material that can work with even higher temperatures.

Plastic injection molding

The GemmeCotti group includes the sister company Gemme Plast, which makes injection molded parts. Plastic parts are injection molded, a production technique widely used for the processing of most thermoplastic polymers. We produce plastic parts that are used for the production of GemmeCotti pumps and that is why we are able to control the quality of our production and guarantee our customers fast delivery with significant savings.
Gemme Plast has a range of different tonnage presses, which make it possible to inject plastic parts of various sizes according to need. So we can offer pumps with a very wide range of performance, varying from 0.5m3/h to 150m3/h.