Pump Selection, buying the correct Pump?
When requesting a pump, the supplier will need basic information to provide the correct pump selection. This is crucial in terms of selecting the correct pump for HEAD (The maximum height in static lift) and FLOW (Normally in liters per minute). A centrifugal pump performance curve is a useful tool which enables anyone to understand how a pump will perform. The supplier needs to be able to peg your pump duty to a specific pump curve. This will determine the most efficient pump selection for the duty. A pump develops a specific PRESSURE (PSI or BAR measurement translated into feet or meters head)at a specific FLOW (normally represented in gallons per minute or liters per minute). This value is dependent on the design of the hydraulic components of the pump. Pump selection is based on a specific flow in liters per minute to head in meters. A note on establishing flow. If you do not know the flow you require it is relatively simple to determine. Take it one step at a time and add all the outlets (Taps or sprinklers together). For industrial applications, for washing, heating or cooling, the equipment will have a flow and pressure data detailed on the design plate. Flow in a system must be established by understanding the requirement of the entire system. In our example we will use a house which has two bathrooms, a dishwasher, a washing machine, an electric geyser in the roof and a guest toilet with hand basin. Also a sink in the kitchen and an outside shower for the pool area. So we have the following outlets :- Bathroom hand basin taps 4. Bath taps 4. Shower taps 6. Toilet cistern 3. Guest basin tap 2. Sink in kitchen 2. Washing machine 1. Dishwasher 1. TOTAL 23. If we assume each tap will be required to deliver 2 gallons per minute (GPM) at 44 PSI or 3 bar. We simply need to determine how many outlets we would expect to operate at any one time. It is unlikely that all toilets, all showers, all baths etc will be on at the same time. A good method is to take a third of the total outlets as your flow required for any single moment in time. In our example that represents 23 divided by 3 or 7.6 make it 8 outlets. This means a flow requirement of 8 X 2 = 16 GPM or 60 liters per minute. A note on the concept of PUMP HEAD. Think about the highest point of your body, the top of your HEAD. It is the same idea when speaking pump selection. Head refers to the measurement in feet or meters from the center line of the pump (the pump shaft center line), to the highest point to which the unit is expected to deliver fluid. The above definition of head is limited to what is known as the Static head. In other words, this is the measurement of the vertical height which should never change, […]
Pedrollo pump catalogue
Pedrollo pump catalogue The Pedrollo pump catalogue includes our high quality, in demand, water pressure pumps. The Pk series peripheral impeller design is very popular in small pump systems. CLICK here In South Africa, with our recent water shortages it has almost become a necessity to install grey water or rain water systems. Pedrollo water pumps for pressure pump purposes are a great option for the small home, garden, irrigation or car wash system. A water tank with a water pump completely equips the homeowner with a basic water supply system which is capable of processing grey water and harvested rain water. While Pedrollo provides a centrifugal pump for most small applications the pressure pump market demands reliability and quality. The Pedrollo pump design studio in Italy is fully equipped to research and manufacture pumps which are extremely efficient. Our pumps are sought after in all countries of the world because of their reliability and low cost of ownership. Pedrollo Contacts for South Africa emails:- For help with pump selection and pricing sales@pedropumps.com For assistance with supply or any further information support@pedropumps.com
The pump to select?
The pump to select? How to determine the pump to select? The correct pump. (exit at any time by scrolling to end of this document) A centrifugal pump performance curve is simply a tool which enables anyone to literally see how a pump will perform in terms of HEAD and FLOW. Every pump will be capable of developing a specific PRESSURE (PSI or BAR measurement translated into feet or meters head) at a specific FLOW (normally represented in gallons per minute or liters per minute) A note on establishing flow. If you do not know the flow you require it is relatively simple to determine if you just take it one step at a time and add all the outlets together. For industrial applications, for washing, heating or cooling the equipment will have a flow and pressure on the design plate. Flow in a system can be established by understanding the requirements. In our example we will use a house which has two bathrooms, a dishwasher, a washing machine, an electric geyser in the roof and a guest toilet with hand basin. Also a sink in the kitchen and an outside shower for the pool area. So we have the following outlets :- Bathroom hand basin taps 4 Bath taps 4 Shower taps 6 Toilet cistern 3 Guest basin tap 2 Sink in kitchen 2 Washing machine 1 Dishwasher 1 TOTAL 23 If we assume each tap will be required to deliver 2 gallons per minute (GPM) at 44 PSI or 3 bar, then we simply need to determine how many outlets we would expect to operate at any one time. It is unlikely that all toilets, all showers, all baths etc will be on at the same time. A good method is to take a third of the total outlets as your flow need for any single moment in time. In our example that represents 23 divided by 3 or 7.6 make it 8 outlets. This means a flow requirement of 8 X 2 = 16 GPM or 60 liters per minute. A note on the concept of PUMP HEAD. Think about the highest point of your body, the top of your HEAD. It is the same idea with pump language, Head refers to the measurement in feet or meters from the center line of the pump (the pump shaft center line) to the highest point to which the unit is expected to deliver fluid) The above definition of head is limited to what is known as the Static head. in other words, this is the measurement of the vertical height which should never change, it is static. Lets say you are needing to deliver water from a tank at the bottom of your garden, to the geyser at the top of your roof. The garden has a steep bank from the house to the lower area where the tank is located. The house is a double story. If one measures the height from the base of the tank […]