Annular ring at the top of the tank
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According to the fire protection regulations for petrochemical enterprises, the ring pipe at the top of equipment in tank areas can be used for cooling as well as for fire fighting purposes. For cooling purposes, carbon steel is required as the material, while galvanized steel is needed for fire fighting purposes. The former can be connected to regular water supply, whereas the latter requires connection to a fire fighting water supply. So, which type of water should be used?
Carbon steel is steel that contains no other alloying elements apart from C, with the amount of C also being kept within certain limits; its hardness is greater than that of pure iron. Generally, it does not have much corrosion resistance. Galvanized steel refers to steel with a layer of zinc coated on its surface; for example, the iron drums used at home serve this purpose of preventing corrosion. The mechanism of corrosion involves electrochemical corrosion of the zinc layer on the surface first, thereby protecting the iron base. Lowering the temperature is for fire safety purposes; it seems it should be done in accordance with fire safety requirements
Follow high standards – fire-fighting water must be connected
Firefighting can help reduce temperature, and the amount of water needed for firefighting purposes is likely to be smaller in that case. Connect to the fire department, just in case.
Personally, I think a strict standard should be applied: fire protection is related to safety issues, while cooling is a requirement of the manufacturing process. Therefore, fire protection water should be used. With this approach, there may be interruptions in water supply and insufficient pressure; whereas fire protection systems typically have fire water tanks and pressure-boosting equipment, ensuring greater stability of the system；
I saw a fairly strict project on site where two pipe connections were made separately, one for fire water and the other for cooling water.
Everything I’ve seen uses directly connected fire water
This post was last edited by Gray Trail 01 on 2016-12-14 at 20:28. Sprinkling is a method used to cool storage tanks; the water pressure for this purpose comes from a dedicated sprinkling pump. The aim is to prevent the tanks from experiencing overpressure due to high temperatures in summer. The sprinkling pipes are usually arranged in a circular pattern – sometimes holes are made directly in the pipes, while other times nozzles are installed. To avoid blockages at the outlets or nozzles, it’s common to use water at a pressure lower than that used in fire-fighting systems. This cooling mechanism is typically linked to the temperature and pressure of the tanks: when the temperature or pressure rises above certain limits, the sprinkling pump automatically starts up to spray water and cool the tanks. For fire-fighting purposes, companies usually use recycled water as the source of water, with the necessary pressure provided by fire pumps. These pumps also have safety mechanisms; the presence of automatic pressure regulation systems or flow indicators helps ensure a steady supply of water. However, it’s not clear whether such systems can be integrated with mechanisms that monitor the temperature and pressure of the tanks. In my experience, this system is used solely for cooling purposes. If, during design, the amount of water and pressure required for sprinkling can meet the requirements of fire-fighting applications, then it’s possible to address both functions simultaneously.
According to the current design requirements, a foam spraying system must be installed inside the storage tank, and only cooling measures can be employed on the top of the tank