How does a pipeline pump achieve automatic shutdown when there is a lack of water in the inlet pipeline?
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The vertical multi-stage pipeline pumps used in the pump room experience water outages from time to time (several times a year). If the pumps are not turned off promptly after such outages, the mechanical seals suffer from wear due to lack of water. After each outage, there is a lot of air in the pumps and pipelines, and it is necessary to manually open the exhaust valves to release this air; sometimes it takes a long time to do so. These pumps are used to supply water to the rooftop tank, and their operation is controlled by a float in the tank based on the water level. I now want to have the pump stop automatically when there is a lack of water in the water inlet pipeline. How can this be achieved? I also want to add an automatic exhaust device (I think there’s a mechanical automatic exhaust valve?) ), what kind is good to install?
Can the pump be started and stopped based on the liquid level? Set up a interlock to stop the pump when the liquid level is low, ensuring that there is no liquid in the pipes in advance
This post was last edited by ylb913 on 2016-10-21 at 20:34. It’s easy to implement this with DCS control – just add a communication link between the DCS and the pump’s distribution panel, as well as a relevant component for stopping the pump on that panel. In our facility, where DCS control is not used, we have also had: a magnetic flap level gauge on site, along with sensors equipped with two relay units for remote monitoring; the pump starts automatically when the liquid level is high, and it stops automatically when the level is low.
Current-induced protectors, level gauges, and the like can all be used
Is the water inlet on the rooftop tank controlled by a float, meaning there is no level gauge? It’s difficult to implement level interlocks; so let’s consider it from an electrical perspective, in terms of current and power. SCAR composite exhaust valve – this type of valve can be seen at the sewage outlet; it is suitable for automatic exhaust during periods when the pump is not in use.
What the poster means is: the water supply comes from the main pipeline network.
This is really tricky; the difficulty lies in knowing when the pump has expelled all the air! ! ! If the air isn’t properly expelled, the mechanical seal will grind dry~
To supply water to the top floor, the water flow should be under pressure; adding a pressure relay is a simple, reliable, and cost-effective solution. Exhaust issue. Add a time relay to delay the process for a certain period, allowing the pump to be filled with water pressure.