TOTAL VALVE SOLUTIONS
A break pressure tank or reservoir is often used when the topography causes pipeline pressure to be too high. It’s a good and safe solution, but it has some disadvantages: They’re expensive and bulky. The level and flow control mechanisms are vulnerable to tampering and damage. Pressure is reduced all the way down to atmospheric…
DetailsNetworks leak. Reducing pressure during periods of low demand has long been a strategy to reduce water loss. Pilot operated PRVs (POPRVs) with electronic controllers that set working pressure by time of day are a quick solution. They have reduced unaccounted for water losses significantly. But these so-called Smart PRVs suffer several problems: They’re expensive…
DetailsYou probably know that Cape Town is running out of water. Reducing water loss is an important part of the strategy for postponing day zero. Water loss is a significant problem for water supply authorities everywhere. It’s worse here in Africa where skilled operators aren’t always available to manage and maintain complex electronic pressure and…
DetailsRecent research has shown that air pockets cause extensive damage and hindrance. They reduce flow capacity and cause energy and head loss. They promote corrosion. Hydrogen sulphide is a well-known cause of corrosion in wastewater pipelines. Most of the studies on the topic acknowledge the contribution of air pockets to the problem, but are silent…
DetailsA correctly-sized flow controller close to the pump discharge provides tamper-resistant protection for centrifugal pumps. Running at below their minimum operating head is a common cause of submersible centrifugal pump failure. (This is the same as allowing them to deliver too high a flow rate.) Flow rate and head should be kept within the manufacturers…
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