GemmeCotti manufactures high quality Magnetic Drive Pumps suitable to handle chemicals and corrosive liquids. Our pumps are usually made in PP, PVDF or AISI316 but for special projects we can also offer pumps made in Hastelloy or Titanium.
They can be used in many different applications: chemical plants, waste water treatment, air treatment, galvanic industry, printed circuit boards production, biotechnology, heat exchangers, photography, textile industries, food industries, aquariums and many more.
The pump selection of a pump is driven by the following main parameters:
– Head (H)
– Flow rate (Q)
– Fluid characteristics (ρ, γ, T ….)
Sometimes head can be confused with pressure during pump choice. As a matter of fact there is a strict relation between them which is defined by the fluid specific gravity, so the relation is fluid dependent. So what is the difference between pressure and head?
Definition of head and pressure
Head is the height given by the pump to the fluid and it is measured in meters of liquid column [m.l.c.] or simply indicated in meters [m]. The given head is fluid independent: different fluids
with different specific gravities are all lifted at the same height. Pressure, instead, is fluid dependent and it is affected by the liquid density. In fact the force of a fixed height liquid column over a unitary area will change with different specific gravities. So in this case the same head generates different pressures.
Measurements: Pressure or Head?
Head is not directly measured. Manometers on the pump suction and delivery line give the measure of the pressure. Measurements given by manometers indicate differential pressures imposed by the pump between suction and discharge. These measures are read in [bar] [atm] [psi] [ft H2O] etc.. Specific gravity γ has to be considered to evaluate the correspondent head.
Conversions & Practical Example
As stated before, the same pump at the same working point will give always the same head with different pressures in accordance with the density γ of the working fluid.
For example, a mag drive centrifugal pump HTM 10 working at a given point Q= 7.5 m3/h H = 10 mlc operating with water and concentrated H2SO4 gives the same head (H=10m) to water ( γ= 1kg/dm3) and to sulfuric acid (γ = 1.8kg/dm3), while measurements of differential pressures between suction and delivery will be:
The mathematical relationship is reported in the following equation:
Also power consumption is influenced by the previous relationship of pressure, as:
Notes for technicians
– Previous relations are valid for low viscosity fluids (water equivalent), along with increasing viscosity, pump performances have to be reduced using pump derating rules.
– At a fixed rotational speed a centrifugal pump generates head related to the flow rate following its characteristic curve.
– The computation of the needed head that should be delivered by the pump, is not so straight as the evaluation of the desired height difference. Needed Head is composed by the following terms:
Geodetic head: difference between suction and delivery height expressed in meters of liquid column
Difference between absolute pressure of the delivery and suction reservoir
Distributed and concentrated friction losses also expressed in m.l.c.
“Quality” is a key word for GemmeCotti, this is why we are an ISO 9001 certified company since 2007. Recently our Quality Management System has been updated to the new ISO 9001:2015, making us one of the first companies in Italy to be certified to the new quality standards. This is a clear proof of our dedication to constant improvement and desire to offer high quality service and products.
GemmeCotti is constantly becoming more and more efficient and the customer satisfaction is always our strong focus. With the main desire to meet customers’ expectations and offer them the best support and top-level products, we aim to continuously improve every business process: from the technical and production department, to the marketing and sales office.
Every aspect is developed and organized so that the company can be competitive and flexible on the pump market and can maintain the position of leading supplier of chemical pumps.
GemmeCotti chemical pumps will be exhibited at the Asian’s leading trade fair for environmental technology solutions IE-EXPO Shanghaifrom 5th to 7th May 2016.
You are welcome to visit our stand HALL N1 BOOTH 1763 where we will show our magnetic drive pumps suitable for acids and chemicals which are completely Made In Italy.
Our technicians will be available at the stand to show the pumps quality and to present the main characteristics. They can also help you to find the best solutions for your pumping needs.
For more than 20 years we have been pursuing one main goal: design and produce magnetic pumps which meet the customers’ needs. That’s what drives us and makes us world-leader in the field of chemical pumps. So what are the characteristics of GemmeCotti pumps which make them unique and so appreciated by customers the world over?
1- Wide range of pumps among which the customer can choose. We have more than 400 pump variations so that we can always offer to the customer the right solution for his application. Each pump is customized according to many variables:
2- High quality pump materials. It’s important for us to offer the highest quality possible that’s why we choose only the best materials (Polypropylene, PVDF and AISI316) which can resist corrosion and which are suitable to pump almost every existing chemical. You can check out our chemical compatibility chart for more information and to select the right pump material for your application.
3- Best pump design for pumping chemicals.Magnetic drive pumpshave a simple sealless design which is the ideal solution when handling chemicals and acids. The hydraulic part of the pump is hermetically closed so there is absolutely no leakage and emission of fluid. This is an essential characteristic because mag drive pumps guarantee safety for both workmen and the environment. Moreover the absence of any seal makes the pump highly reliable eliminating the maintenance and repair costs.
Typical pump design: The external magnet of the pump is placed on the motor shaft and when rotating it transmits the motion to the internal magnet thanks to the magnetic attraction of the two joints. The internal magnet is connected to the impeller which spins and moves the fluid through the pump. The external magnet and inner magnet are separated by a rear casing that creates a hermetic containment of the liquid that has no access to the outside.
4- Chemical pumps completely Made in Italy. We are an Italian manufacturer and we are proud to offer high quality pumps designed, assembled and tested directly in our workshop. The pump parts are made and machined by ourItalian suppliers all located near our factory. So, for us, suppliers play an important role in the resulting quality of the pumps. That’s why we choose and qualify them through a strict qualification process and we keep a close relationship with everyone in order to assure the highest quality of each pump part and consequently of the complete chemical pump assembly.
5- Every pump is checked and tested before delivery. What is the best way to assure the pump quality than try it personally? We perform rigorous tests during the whole assembly process according to ISO9001 based quality control standards. That is not all. We want to achieve zero defect rate, which is why we test every single pump at our test bench before delivery to our customer to check both the performances and the correct functioning.
6- Chemical pumps suitable for many applications. GemmeCotti industrial pumps can be used in various applications where chemicals, acids, dangerous liquids are involved, such as: chemical industries, waste water treatments, galvanic industries, surface treatments (zinc-plating, silver-plating, coppering galvanic treatments, chemical nickel plating) in machines and equipment for the printing industry, in machines for tanning industries, for printed circuit boards production, in scrubbers, air treatment plants, petrochemical and oil & gas industry, for biofuel handling, in textile industry, food industry and in bottling machines. Moreover GemmeCotti mag drive pumps can be used also for pumping salty water and water containing detergents.
Contact our sales department and we will help you choose the right pump for your application.
GemmeCotti pumps are 100% MADE IN ITALY. They are designed, assembled and tested in our workshop, while the pump parts are made and machined by our suppliers, all Italians and located near our company. So, for us, the suppliers play an important role for the resulting quality of the pumps. That’s why we choose and qualify them through a strict qualification process and we keep a close relationship with them in order to assure the highest quality of each pump part and consequently of the complete pump assembly.
If GemmeCotti suppliers are so important, why don’t we introduce them to our customers? That’s what we thought and what convinced us to make a video interviewwith some of them. We contacted our mould supplier and our injection molded parts supplier and they happily accepted our request to film their companies and to make a short interview with them.
So now we are proud to introduce our Italian suppliers who, thanks to their vast experience in their field, help us to produce high quality pumps completely made in Italy.
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