Just like any irrigation equipment, we need to account for your system's highest and lowest flows. Always consider maximum flow when running multiple stations at a time.
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Although your system may only have flows up to 100 GPM, we may specify a filter that can handle much more.
Why would we do this? There are two factors that affect the rate at which water can flow through the filter:
Rain Bird will determine the best fit for you. However, the example below shows the variation in flow rates based on micron size and water source for this specific model of filter (HN-G-02).
Most applications will follow the Average, Poor, or Very Poor lines. You always want to select a filter that can accommodate a greater water flow than the system is expected to see.
When designing an irrigation system, or an open loop water source heat pump intake, or a cooling water intake, implementing primary filtration is essential. Whether you are sourcing water from a pond, stream, canal, river, or even a golf course lake, keeping the water free of rubbish, weed and debris is imperative.
Pump suction screens play a critical role in water management systems, especially for industrial scale applications handling large volumes of water. Typically, these screens feature coarser mesh, making them ideal for more robust applications. Their role is to ensure that all water must pass through the screen before entering the pump intake pipe. This provides the first line of defence against debris, weed, contaminants and anything else that may potentially clog or block the pump.
And pump suction screens are often the first or only protection for expensive equipment further down the line - for example heat exchangers, water monitors, irrigation nozzles and drip feeds, and of course secondary filtration devices.
A pump suction screen will probably do a good job of preventing leaves, rubbish, suspended solids and any other larger detritus from getting into a pumped system. So using one is a no-brainer, right? Yes, but… what happens when the pump suction screen begins to block?
The limited surface area of intake screens often means they can easily become clogged. The mesh size is also crucial - it must filter debris larger than the pump impeller clearance, preventing clogging while protecting other equipment like spray bars and irrigation nozzles.
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The dilemma is that by protecting the pump and downstream equipment from blocking, the intake screen is being set up to fail. So which is less damaging to the system and how much maintenance is needed?
There is a trade-off between how finely water can be screened versus how often the screen needs to be cleaned. These days, with increasingly stringent regulations covering water abstraction and wildlife protection, compliant screen apertures are getting smaller. This means they block more quickly, which means more maintenance, more downtime and frequent interruptions to flow. All of which has costs.
No pain, no gain. Well, it's often been said. The criticality of keeping water flowing where there is the potential for debris or other contaminants in the water to clog or block will depend on the application. The maintenance required could be determined by the criticality, the quality of the source water, and the cost of maintenance compared with the cost of downtime.
Undoubtedly a good maintenance regime, either at the pump suction intake or further into the system, will keep water moving as required. But it is also worth considering what steps may be taken to reduce the maintenance overhead.
Good positioning of pump suction screens, ensuring depth as well as protection from for example strong currents, overhanging trees, water traffic, and avoiding areas likely to silt up, yet at the same time enabling good access for maintenance. This is not always straight forward or ideal, and can be costly if purpose built structures are required.
While bearing all this in mind, it's worth also considering pump suction screens with some capacity to self-clean with a backwash to minimise the accumulation of debris on the intake.
Rotorflush screens used successfully and reliably within the water treatment industry and oil and gas sector, and for eel screening in raw water abstraction.
Our filters and screens deliver low maintenance, efficient filtration in very difficult conditions. The rotors continuously backwash the mesh screen, removing anything that might cause it to block. See ‘How Our Filters Work’ HERE
Rotorflush self-cleaning filters and strainers allow pumps to operate in many situations where water is dirty or contains debris and particulate, and where dirty water causes equipment to block and clog.
Anyone who has ever faced the problems caused by a conventional pump suction screen will appreciate the low maintenance and efficient filtration delivered by Rotorflush self-cleaning screens strainers and filters.
For more Self-Cleaning Screen Meshinformation, please contact us. We will provide professional answers.