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. Currently, 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, it wasn’t possible to seal them tightly enough, which prevented pressure from building up inside the cabinet. Is there any better 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. !
This is impossible; the inspection will definitely bring it up
Positive pressure explosion protection systems generally require interlocking mechanisms; for example, the power supply inside the cabinet should be automatically cut off when the pressure inside drops below a certain level, or when the cabinet doors are opened
It is generally pressurized ventilation, with a pressure switch controlling the supply of instrument air to the cabinets.
Positive pressure ventilation is an option, but how can the incoming wires be handled so as to maintain pressure inside the cabinet? It seems that the plastic inside the gland hasn’t pressed against the cable insulation; the gap is too large.
Can’t it be sealed off with explosion-proof putty? ? ? ?
This approach is not recommended. If remote cabinets are to be used, they should not be placed in the tank area; instead, they need to be located at a safe distance from it, with optical cables then being used to transmit signals to the control room.