Question 1

What is a centrifugal pump?

Accepted Answer

It is an operating machine that exploits the centrifugal effect of the impellers to move the liquid, transforming the mechanical energy coming from its motor first into kinetic energy and then into pressure energy that it gives to the raised liquid.

Question 2

What kind of centrifugal pump do I need?

Accepted Answer

A centrifugal pump has to be selected considering the flow rate of liquid that must circulate and the pressure (head) with which the same liquid must be re-launched inside the system. The performances of a centrifugal pump depends on its rotation speed which is determined by the rotation speed of the driving motor.

Question 3

What is the water hammer?

Accepted Answer

The water hammer is a pressure peak caused by a rapid change in the flow speed in the pipeline. It is normally caused by the sudden closure of a valve or the sudden start / stop of the pumps. It is accompanied by the typical thud of the pressure wave that propagates inside the pipeline. The water hammer can also irreparably damage the pipes, valves and other system elements such as the pumps.

Question 4

What is cavitation?

Accepted Answer

Cavitation is the formation and subsequent implosion of vapor bubbles within the liquid. It occurs when the pressure inside the circuit equals or drops below the liquid value tension. It is accompanied by the characteristic noise produced by the strong impacts of the steam bubbles that implode against the solid surfaces of the pump. Cavitation reduces the hydraulic performances of the pump, generates surface erosion and vibrations that mechanically damage the pump.

Question 5

How to control corrosion in a pump?

Accepted Answer

Corrosion is a complex electrochemical phenomenon produced by the interaction of the pump components with the environment. Generally it is influenced by the simultaneous presence of mechanical stresses. Corrosion can lead to major failures if not properly controlled. The selection of the construction materials of the pump and other system components is crucial to prevent the onset of corrosive phenomena. Visual inspection of the pump and its main components is the simplest way to reveal the presence of anomalies. It should be carried out periodically because the chemical-physical conditions of the environment can change over time.

Question 6

Where can I find the right spare parts for my Rovatti Pompe product?

Accepted Answer

Spare parts for Rovatti Pompe products can be easily selected on the spare parts catalog available online (www.rovatti.com) or from the local authorized dealer. The Rovatti Pompe Customer Service is always available for any further need (info@rovatti.it - tel. +39 0522 66 50 00).

Question 7

Do I have to necessarily follow the instructions supplied with the Rovatti Pompe products?

Accepted Answer

Yes, absolutely. The installation and operating instructions supplied with the Rovatti Pompe product contain all the basic information that must be strictly followed in relation to installation, operation and maintenance. Therefore these instructions must be read by the user before installation and starting. Furthermore, they must always be available to the staff on site.

Question 8

Where can I find information about troubleshooting about Rovatti Pompe products?

Accepted Answer

The use and maintenance manual attached to each Rovatti Pompe product contains information to identify and solve the main problems that may occur during the use of the purchased product.

Question 9

What does clean and cold water mean?

Accepted Answer

According to Regulation 547/2012 / EC, clean water means water with a maximum content of non-absorbent solid materials equal to 0.25 kg/m3 and with a maximum content of dissolved solid materials equal to 50 kg/m3, considering that the total gas content of the water does not exceed the saturation volume. Con&shy;&shy;ventionally cold water means clean water at a temperature of 20 &deg; C.

Question 10

What is the &ldquo;Best Efficiency Point&rdquo; (BEP) of a pump?

Accepted Answer

The Best Efficiency Point (BEP) is the operating point where the pump works at the maximum efficiency. If a pump works as close as possible to its BEP, the mechanical life of its components will be longer and the energy consumption of the system will be lower.

Question 11

What is the NPSH curve of a pump?

Accepted Answer

The NPSH curve is a data provided by the manufacturer to show, as the flow rate varies, the pressure losses  inside the pump as a result of its design. For a given flow rate value, the NPSH of the hydraulic circuit at the pump suction port must be higher than that required by the pump manufacturer in order to avoid cavitation.

Question 12

What happens if the pump works with a too low capacity?

Accepted Answer

When a pump operates at a lower flow rate than the minimum required in the technical documentation, hydraulic instability, excessive mechanical stress on the bearings and overheating conditions may arise. The pump should works within a flow range near the BEP point in order to ensure a long mechanical life of the components and containing the energy consumption of the system.

Question 13

What happens if the pump works with a too high capacity?

Accepted Answer

When a pump operates at a flow rate greater than the maximum specified in the technical documentation, hydraulic and mechanical instability phenomena may arise compromising the components of the pump and the driving motor. The pump should works within a flow range close to the BEP point in order to ensure a long mechanical life of the components and containe the energy consumption of the system.

Question 14

How to improve the corrosion resistance of a cast iron pump?

Accepted Answer

Rovatti cataphoresis treatment is an electrochemical coating process for cast iron components that improves protection from weather conditions, alkali and diluted acids. It is characterized by a high adhesion to the surfaces and uniformity of the coating also in the inner cavities of the component. The result is a black semi-gloss protective layer with homogeneous thickness. Rovatti cataphoresis treatment produces a reduced surface friction in the hydraulic channels improving pump efficiency and increasing driving motor life. Components treated with the Rovatti cataphoresis coating are easily removable during the usual maintenance operations.

Question 15

Does Rovatti Pompe provide a technical support service?

Accepted Answer

Yes, we supply competent technical support for all of our products. For any further need, the Rovatti Pompe Customer Service and the Rovatti Pompe After-Sales Service are always available (info@rovatti.it - tel. +.39 0522 66 50 00).

Question 16

What can I do if I do not find a pump suitable for my needs in the Rovatti catalog?

Accepted Answer

You can contact your local authorized dealer. The Rovatti Pompe Customer Service is always available for any further need (info@rovatti.it - tel. +39 0522 66 50 00).

Question 17

Is it possible to install electric borehole pumps horizontally or obliquely?

Accepted Answer

Submersible motors were primarily designed to run vertically. In case of horizontal or oblique installation, the motor must be rigidly aligned with the pump and securely mounted to avoid any load on the shaft and bearing and avoid any vibration that could damage the motor. Submersible motors suitable for horizontal or oblique installation can be found on our technical documentation. The Rovatti Pompe Customer Service is always available for any further need (info@rovatti.it - tel. +39 0522 66 50 00).

Question 18

What is a cooling casing and when should it be used?

Accepted Answer

During operation of the electric submersible pump, the flow of the inlet liquid laps the external surface of the electric motor in order to cool it. When the size of the well does not allow to obtain the minimum speed for maintaining the motor properly cooled (as reported on our technical documentation) the electric pump can be inserted inside a casing that is narrower than the well to increase the speed of the liquid flow which laps the outside surface of the electric motor.

Question 19

What are the main advantages of a vertical lineshaft pump?

Accepted Answer

The vertical lineshaft pumps are suitable for agricultural, civil, industrial and fire-fighting applications. They are suitable for installation in wells, tanks and reservoires. They combine the advantages of electric submersible pumps with those of surface pumps. Since the pump body is immerged into the liquid, the suction capacity of the pump is always guaranteed. It is also possible to couple them to different driving units such as electric motors, endothermic engines and tractor PTO.

FAQ

FREQUENTLY ASKED QUESTIONS ON ROVATTI PUMPS

What does clean and cold water mean?

What is the “Best Efficiency Point” (BEP) of a pump?

What is the NPSH curve of a pump?

What happens if the pump works with a too low capacity?

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Rovatti Pompe

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FAQ

FREQUENTLY ASKED QUESTIONS ON ROVATTI PUMPS

What does clean and cold water mean?

What is the “Best Efficiency Point” (BEP) of a pump?

What is the NPSH curve of a pump?

What happens if the pump works with a too low capacity?

Newsletter

Rovatti Pompe

More information

Market Area

Products

General Overview

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