Are there control cabinets that can be installed in hazardous areas?
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As stated in the title, in the oil storage tank area, it is necessary to install pneumatic inlet and outlet valves, fire water valves, fire foam valves, high and low liquid level switches, and other instruments on each tank. Since the control room is too far away, using cables to connect the instruments of each tank directly to the control room would require an excessive amount of cable. Now, it is planned to divide the tank area into 3 sections, with 3 remote cabinets placed in those areas. What are some good solutions for installing control cabinets in such hazardous zones? I have used positive-pressure explosion-proof cabinets before; the air supply was continuously flowing into them. At the cable entry points at the bottom of the cabinet, there was one hole for each cable, with a gauge corresponding to each hole. Although each cable hole had a gland, they still couldn’t be sealed properly, which prevented pressure from building up inside the cabinet. Is there any good way to solve this problem? What the leader means is to replace the cables with multi-core, multi-group ones; for example, replacing 1*2*1.5 with 12*3*1.5 mm2 in order to reduce the number of cable connections. Still, I don’t think this is a good solution either, as air leakage will still occur inevitably. I don’t want to use multi-core cables, as this would require additional explosion-proof distribution boxes, entail more calculation work as well as more wiring points, making the installation process more complex and increasing the time required for installation. It would also lead to many unforeseen problems after it’s put into use. I would be very grateful if this problem could be resolved properly! Here is wealth.
Positive pressure ventilation is the only option. It’s better to consider connecting to the control room; how far away can it be? A multi-core cable can be used to connect to the control room.
The air leakage is caused by the gland head being too large; it can be sealed with explosion-proof putty
I’ve tried it, but the sealing isn’t very good
How far can it be? Far enough to have to put the cabinet in the tank area? If cost savings are a priority and the distance is significant, a bus system combined with explosion-proof hubs could be considered; however, it seems that the cost of such a setup might not be lower than that of using cables throughout, though it does save labor.
At present, the only practice that meets the standards is positive pressure fume hoods. If you don’t want to use it, you can connect it directly to the control room; 500~600 meters is absolutely no problem.