ROVATTI PUMPS | Irrigation Tractor PTO pumps

There are many types of centrifugal pump systems. In a typical industrial pump system there are many variations on this including all kinds of equipment that can be hooked up to these systems that are not shown. A pump after all is only a single component of a process although an important and vital one. The pumps' role is to provide sufficient pressure to move the fluid through the system at the desired flow rate. Atypical domestic water supply system takes it's water from a shallow well (25 feet down max.) using an end suction centrifugal pump. A jet pump works well in this application. Another typical domestic water supply system takes it's water from a deep well (200-300 feet) and uses a multi-stage submersible pump often called a turbine pump.Three important characteristics of pump systems: pressure, friction and flow Pressure, friction and flow are three important characteristics of a pump system. Pressure is the driving force responsible for the movement of the fluid. Friction is the force that slows down fluid particles. Flow rate is the amount of volume that is displaced per unit time. The unit of flow in North America, at least in the pump industry, is the US gallon per minute, USgpm. From now on I will just use gallons per minute or gpm. In the metric system, flow is in liters per second (L/s) or meters cube per hour (m3/h).
Pressure is often expressed in pounds per square inch (psi) in the Imperial system and kiloPascals (kPa) in the metric system. In the Imperial system of measurement, the unit psig or pounds per square inch gauge is used, it means that the pressure measurement is relative to the local atmospheric pressure, so that 5 psig is 5 psi above the local atmospheric pressure. The kPa unit scale is intended to be a scale of absolute pressure measurement and there is no kPag, but many people use the kPa as a relative measurement to the local atmosphere and don't bother to specify this. This is not a fault of the metric system but the way people use it. The term pressure loss or pressure drop is often used, this refers to the decrease in pressure in the system due to friction. In a pipe or tube that is at the same level, your garden hose for example, the pressure is high at the tap and zero at the hose outlet, this decrease in pressure is due to friction and is the pressure loss.
As an example of the use of pressure and flow units, the pressure available to domestic water systems varies greatly depending on your location with respect to the water treatment plant. It can vary between 30 and 70 psi or more. The following table gives the expected flow rate that you would obtain for different pipe sizes assuming the pipe or tube is kept at the same level as the connection to the main water pressure supply and has a 100 feet of length

The pump provides the energy necessary to drive the fluid through the system and overcome friction and any elevation difference. Pressure is increased when fluid particles are forced closer together. For example, in a fire extinguisher work or energy has been spent to pressurize the liquid chemical within, that energy can be stored and used later. Is it possible to pressurize a liquid within a container that is open? Yes. A good example is a syringe, as you push down on the plunger the pressure increases, and the harder you have to push. There is enough friction as the fluid moves through the needle to produce a great deal of pressure in the body of the syringe. If we apply this idea to the pump system of Figure 5, even though the discharge pipe end is open, it is possible to have pressure at the pump discharge because there is sufficient friction in the system and elevation difference. Rovatti electrical pumps home page <> About us/Profile<> About us/A partner in problem solving Products/Green Line <> Products/Orange Line <> Technical Info <> Find Us <> Contact us/Information <> Contact us/Job area <> News <> Italian version

Tractor PTO pumps"T"

Single and multistage pumps with speed increasing water cooled oil bathed gearbox incorporating various gear ratios. Driven by tractors and mounted on two wheeled trailer or 3 point linkage they are very versatile and suitable fr agricultural mobile irrigation or other applications requiring a rapid installation.
- available in EUROPA series

Tractor PTO pumps T

Use

Irrigation

Performances

INLET X OUTLET	MAX. CAPACITY	MAX. HEAD	MAX. POWER	PDF
50 x 40	30 m³/h (500 l/min)	140 m	26 kW (35 CV)
65 x 40	30 m³/h (500 l/min)	130 m	37 kW (50 CV)
65 x 50	75 m³/h (1250 l/min)	170 m	55 kW (75 CV)
80 x 65	120 m³/h (2000 l/min)	160 m	75 kW (100 CV)
100 x 80	210 m³/h (3500 l/min)	160 m	110 kW (150 CV)
125 x 100	270 m³/h (4500 l/min)	110 m	132 kW (180 CV)
150 x 125	330 m³/h (5500 l/min)	26 m	30 kW (40 CV)
200 x 200	600 m³/h (10000 l/min)	26 m	55 kW (75 CV)
250 x 250	1020 m³/h (17000 l/min)	18 m	45 kW (60 CV)

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Energy and head are two terms that are often used in pump systems. We use energy to describe the movement of liquids in pump systems because it is easier than any other method. There are four forms of energy in pump systems: pressure, elevation, friction and velocity. Pressure is produced at the bottom of the reservoir because the liquid fills up the container completely and its weight produces a force that is distributed over a surface which is pressure. This type of pressure is called static pressure. Pressure energy is the energy that builds up when liquid or gas particles are moved slightly closer to each other. A good example is a fire extinguisher, work was done to get the liquid into the container and then to pressurize it. Once the container is closed the pressure energy is available for later use.