water pump selection
water pump selection Water pump selection assistance from Pedrollo pumps South Africa The most common issue a prospective buyer of a water pump for domestic use has is trying to determine the type and model pump to purchas. The major stumbling block is not knowing what to ask for? Where does one start with providing information for the pump supplier in order to have them assist you in determining the type or size of pump you may need. Going through a load of pump data to try to determine the correct unit for your use is time consuming and can become stressful. When things get a little hectic, give us a call or mail us at support@pedropumps.com for assistance. BEFORE YOU MAIL OR CALL….. Here is a quick guide with the information you will need to give your pump suppliers:- Guidelines for your enquiry:- Please have the following information available when requesting a pump quotation. Flow rate, Pump fluid flow rate in litres per minute. Static Head, the highest point to which the pump must elevate the fluid is known as static head. It is measured from the centre body of the volute casing to the maximum vertical height of the discharge pipe above the pump. Friction Head, the friction loss that the fluid will develop while travelling through the pipe system. In terms of water this is easily determined by consulting a friction loss curve. You will need to know the total length of the pipe and the internal diameter of this pipe. Suction condition Another piece of information you will need is the suction condition you expect the pump to operate with, is it flooded (water level above pump centre body) self priming (pump is above water level) Submersible (pump is located inside the water body? Once you have this basic information, you are ready to send your mail or make a call to sales as per the contact details above. Please email this information for accurate and fast responses.
Pedrollo self priming pumps
pedrollo self priming pumps pedrollo self priming pumps available in South Africa Self priming pumps by Pedrollo available in South Africa are of the JSW series. The JSW 1, 2 and 3. The self priming system developed by Pedrollo is the internal venturi Jet system. Sometimes these units are called jet pumps and are widly used for fresh water extraction form well points or shallow wells. These units operate by internally circulating one third of the water into the impeller eye via a venturi priming system. Pedrollo South Africa provides this range of product predominently to domestic users. The venturi self priming systems are capable of efficiently drawing from depths up to 8 meters at sea level. The Pedrollo self priming pumps stocked in South Africa are both cast Iron and stainless steel versions of the venturi priming system. Please call our sales team for further assistance with your pump selection. sales@pedrolpumps.com support@pedrolpumps.com Phone +27 31 777 1629
Pump pressure control system
Pump pressure control system The simple pump pressure control system available from Pedrollo, South Africa has many advantages. We often have the request to assist with the design on systems where water is pumped from a dam. river. pond/ bulk storage to a service tank next to a home etc. The problem seems to occur when the user becomes embroiled in working on complicated control systems and ends up with horrific costs for cable runs or radio telemetry systems. The simplest system to use is to have the pump fitted with either an electronic pressure/flow controller like the Pedrollo Easy Press or a Hyrdrosphere/pressure switch system. Pedrollo Easypress This controller activates if it recognises a flow demand and / or a pressure set point. The really great feature of the Pedrollo Easy Press is that it has a storage vessel to buffer the pressure on/off switch. This buffer zone is fantastic for two purposes, potential dry run operation (lack of water on the suction side of the pump like an empty dam or low water level in the source) and long discharge pipe lengths. This buffer is essential to enable the unit to switch positively and not to instantly switch when the contacts would close and open with oscillating flow. Once one has a pump fitted with an automatic controller the rest is relatively simple. A ball float valve or a solenoid valve at the point of delivery completes the cycle. Basically the pump reacts to the line pressure. In this case the ball float valve in the receiving tank rises and closes the valve, pressure in the line builds and flow slows. As the flow stops with the closed valve condition, the controller (which is located at the pump and can be up to 200 meters away from the pump) stops the pump. Water usage from the tank will drop the water level, the ball float drops with the water level, opening the valve, releasing pressure and generating flow. The controller sees the resultant flow and pressure drop and the pump starts. We do like to use the older technology HYDROSPHERE PRESSURE PUMP systems in long er pipe runs. The size of the hydrosphere must be linked to the pump flow at the operational head of the system. We like this system for very long pipe runs up to a few Km due to the added protection provided to the motor for stop/start conditions. The hydrosphere tends to absorb and delay stopping and starting due to pressure and flow variations in longer pipe runs, small leaks, air entrainment etc. One does need to ensure that the pumps are protected with the correct overload protection. We like to recommend a proper control panel be installed with the pump which includes surge protection. In Southern Africa with power cuts, brown and black outs which can be frequent, it is crucial to ensure the electrical components are adequately protected. The above represents the simplest way of controlling a pump remotely without using […]