European Parliament

A GREAT EXPERIENCE AT THE EUROPEAN PARLIAMENT FOR GEMMECOTTI

On 14th November 2023, our company was invited to the 6th edition of the European Parliament of Enterprises™ that took place in the hemicycle of the European Parliament in Brussels.
Our CEO Mr Enrico Gemme decided to participate in this interesting experience and he had to debate and vote on some of the most crucial topics for businesses on the EU agenda.
There were entrepreneurs from all over European countries who had the unique opportunity to have a direct debate with high representatives of the EU institutions.

Representatives of the EU institutions              European Parliament

This event was organized into 3 main sessions in which all the businessmen and businesswomen were asked to give their opinions and vote 5 key questions directly related to the topic of the session: 

  1. First session – Unlocking the potential of the single market for skills and human capital 
  2. Second session – Navigating the energy crisis 
  3. Third session – Strengthening Europe’s competitiveness in uncertain times

GemmeCotti at the European Parliament              Session vote

It was an educational and very interesting experience that has given many points for reflection on crucial topics and every businessman and woman got a chance to become a Member of the European Parliament for one day.

We enjoyed it and we hope to be invited to the next edition!

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centrifugal pumps

Centrifugal pumps: characteristics and functioning

Centrifugal pumps are used in a very wide range of industries, from chemical-petrochemical to textile to water treatment, electronic, etc.
If you are looking for accurate and specific information regarding centrifugal pumps, you are in the right place! In the following paragraphs, in fact, we are going to explain their characteristics and how they work.

Centrifugal pumps: classification

Based on the position of the drive shaft that moves the impeller, there are two types of centrifugal pumps

  • horizontal pumps 
  • vertical pumps: suitable for applications where installation of the pump semi-submersed in the liquid is required (tanks, reservoirs, sumps etc.)

Horizontal centrifugal pumps can be installed: 

  • above the fluid level: in this case, the pump has to be self-priming
  • below the fluid level: the pump is installed below the liquid level so it is flooded

Centrifugal pumps are composed of an impeller, assembled on the motor shaft, which rotates inside the pump head. The liquid enters in the axial direction but different types of pumps have different outflow directions:

  • Radial flow pumps (most common)
  • Axial flow pumps
  • Mixed flow pumps

Centrifugal pumps: components

The main components are:

  • the pump head (or pump casing)
  • the impeller, which is connected to the motor shaft. You can choose between different types of impellers for centrifugal pumps: open, which is used with liquids with a higher concentration of impurities; closed, when there is a smaller percentage of suspended solids; semi-open etc. 
  • the shaft
  • the motor
  • Sealing system to prevent liquid leakage between the pump head and the shaft

There are different types of sealing systems, such as: 

  • mechanical seal pumps, in which the pump shaft, connected to the impeller, exits to the outside to be connected to the motor, and a mechanical seal is installed to ensure sealing
  • mag drive centrifugal pumps in which the external magnet is assembled directly on the motor shaft and it transmits motion to the impeller by means of an internal magnet through magnetic force. In this case, the shaft does not pass to the outside of the pump. 

The external magnet placed on the drive shaft transmits the motion to the internal magnet connected to the impeller which rotates and moves the fluid through the pump. So the containment rear casing contains the internal magnet mentioned above and it ensures a hermetic seal on the hydraulic part of the pump, keeping it separated from the motor.

The figure below shows the main components of these pumps:

Centrifugal pumps: functioning

How does a centrifugal pump work? Operating curves and graphs can be used to describe their performance and area of work.
For a centrifugal pump, the performance curves can be seen in graph 4.1 while graph 4.2 shows the case of a positive displacement pump:

graph 4.1pumps curves positive displacement pump curves graph 4.2

The top graph in both figures describes the head variation given by the pumps as the flow rate changes. The best performance is recorded by working centrally, both on the x-axis and y-axis. So between 2 and 2.5 m3/h and between a head of 4 and 5 m. 

For the proper functioning of a centrifugal pump plant, it is necessary to verify that the NPSH available in the plant is higher than the NPSH required by the pump.

We will not expand on the explanation of NPSH here but you can refer to the following link: https://www.gemmecotti.com/npsh-a-brief-explanation/

GemmeCotti centrifugal pumps

GemmeCotti can supply four different models of mag drive pumps and one model of mechanical seal pumps: 

HTM PP/PVDF and HCM PP/PVDFMAG DRIVE CENTRIFUGAL PUMPS

  • thermoplastic pumps made in PP or PVDF
  • capacity up to 130 m3/h
  • head up to 48 mlc
  • HTM : injection molded parts – HCM: casing machined from a block

HTM mag drive centrifugal pump           HCM mag drive centrifugal pump

HTM SP SELF-PRIMING MAG DRIVE CENTRIFUGAL PUMPS

  • thermoplastic pumps made in PP or PVDF
  • capacity up to  25 m3/h
  • head up to 22 mlc
  • injection molded parts
  • self-priming up to 6 m

HTM-SP self-priming mag drive pumps

HTM SS 316AISI 316 MAG DRIVE CENTRIFUGAL PUMPS

  • thermoplastic pumps made in AISI 316
  • capacity up to 32 m3/h
  • head up to 24 mlc

HTM SS316 mag drive centrifugal pump

HCO MECHANICAL SEAL CENTRIFUGAL PUMPS

  • thermoplastic pumps made in PP or PVDF
  • Flow up to 130 m3/h
  • Head up to 48 mlc

HCO mechanical seal pump

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plastic pumps

Plastic pumps: characteristics and advantages

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.

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GemmeCotti’s new website is online

We’re happy to announce that GemmeCotti’s website has been redesigned and the content updated. Now it’s more intuitive and user-friendly to help you find what you need.
Read the article to stay up to date with all the news!

HOME PAGE

Do you want to discover more about GemmeCotti pumps? On the home page of our new website, we have added the range of pumps for acids and corrosive liquids for easy and direct access to all our products. 

If you want to explore our website, we’ve made the navigation easier by adding the drop-down menu to find all the product categories, like our mag drive pumps, the best-selling GemmeCotti product.

And where can you find the main applications of our industrial pumps? Easy, always on the home page below the GemmeCotti range of pumps section.  

PRODUCT PAGES

On the product pages of our magnetic pumps, you can find lots of changes compared to the previous version of the website:

  • Curves and technical data of each pump to let you know clearly and accurately their performances
  • Strong points of our mag drive centrifugal pumps

 

  • Presentation of the optional available for each type of pump (flanges, baseplates and dry-running protection device)

 

MAG DRIVE CENTRIFUGAL PUMP PAGE

Are you curious to know how a mag drive pump works? On this page, we explain every detail of its functioning and all the advantages of our mag drive pumps. 

Welcome to our new website www.gemmecotti.com and good navigation!

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