The fire protection system wants to maintain a pressure of around 8 kilograms while also enabling circulation – what equipment can be used to achieve this?
Thread Content
The fire protection system wants to maintain a pressure of around 8 kilograms while also enabling circulation – what equipment can be used to achieve this?
The stable high-pressure system can be maintained at above 0.7 MPa; a stable high-pressure water station should be installed, and the design shall be carried out in accordance with the fire protection provisions of GB50160.
Let me mention a similar issue: the high-pressure fire water in our factory is also specified to be at 0.8 MPa, and the pressure is usually maintained at that level. However, during an accident drill, when the high-pressure fire hydrants were turned off, they broke apart – the quality of those hydrants was really poor. I won’t go into the specific reasons for this. At that time, they said that during the process of closing the fire hydrant, the maximum pressure of the fire water could reach 1.2 MPa.
By “cycle” the poster means cycling back to the water tank/reservoir? Why loop, wasting electricity for no reason?
The quality of fire hydrants on the market these days is indeed poor; Lao Yu Factory is not an isolated case but a common phenomenon. Chemical plants require high-temperature and high-pressure systems; the fire hydrants are made of cast iron, rated at 16 kilograms, but there are doubts about this rating, as problems can easily occur under such high pressures. There have also been several incidents of fire hydrants breaking or cracking in our factory area.
I don’t know what purpose there is for cycling it； Most of the fire protection systems in our companies in the south are non-circulating ； A displacement pump is used to maintain pressure: the pump is activated when the pressure is low ； Stop the pump when Dali reaches a certain value ； In this way, it is ensured repeatedly that the pressure remains within a certain range ； If one wants to achieve what the original poster mentioned – pressure shifting while maintaining circulation – then all that’s needed is to add a backpressure control by installing an additional return pipeline ； Pressure regulating valves or backpressure valves are installed in the pipelines to control the pressure in the fire protection pipelines ；
Our fire protection system doesn’t have electric heating, and it’s located on the ground level; therefore, I’m thinking of installing a heat exchanger in the boiler to heat the water through circulation. The pressure control system needs to maintain a pressure of 8 kilograms, so I’m currently considering what type of pump would be suitable for this purpose
Fire water is not circulating water; it is difficult to establish a closed-loop circulation, making it unsuitable for heated circulating water supply. For pipes with heating inside the building, there is no problem; for large-diameter pipes outside, insulation is sufficient. For small-diameter pipes outside, in addition to insulation, electric heating may also be necessary, depending on the lowest ambient temperature.
My idea is to connect the fire-fighting pipeline with the foam pipeline, add a shut-off valve in between, and then create a circulation system; but I’m now considering what kind of equipment can be used to achieve this circulation while maintaining sufficient pressure
I didn’t explain it to you clearly enough. You can draw a flowchart to explain it and send it over so that everyone can share their opinions. Pump channels can be used to establish a water cycle, but it is difficult to ensure operational stability.