What is the situation with gravity-fed return water and pressure-driven return water in cooling exchange equipment?
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This post was last edited by flute6 on 2015-12-16 at 12:40. According to the standards, a shut-off valve is not required at the self-return water outlet, while one is necessary at the pressure return water outlet. Isn’t the circulating water in heat exchangers always under pressure? Could everyone please explain these two scenarios?
I have seen buried fire water pipelines and fire foam pipelines that are gravity-fed as well as those with a slope. There is little natural flow of circulating water.
Self-flow backwater is used in sulfur plants; it is water from the circulation system that is sprayed under the steel belt of the granulator, flows by gravity into a collection tank, and then is pumped back into the circulation water return pipeline.
No wonder; it turns out that there’s not much water flowing naturally at the site
I’ve never seen any that flow on their own; I thought it was something special
Backflow is a last resort; otherwise, an additional pump would need to be installed, increasing energy consumption.
The general devices for self-returning water are relatively small, making full use of potential energy to save energy. As mentioned above, there is a tank where the water flows naturally to the lower level; from there, it is pumped to the cooling tower on the roof, and then flows down again. That’s the process I’ve seen.