Issues regarding the placement of control cabinets in the wine tank area
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In the wine tank area, Zone 2 with explosion protection, and in Class A workshops, efforts are being made to reduce the number of cables. A valve island equipped with IO cabinets is placed in the wine tank area; these cabinets are used to collect signals, which are then sent to the control room’s control cabinets. Control cabinets can be installed in explosion-proof areas, and flameproof cabinets can be used for such purposes. There is one issue: according to the plan provided by the manufacturer, if IO cabinets are used for the valve island, the number of control cabinets required will be over 70. The client wants to know whether this meets the relevant regulations. I haven’t found any specific requirements regarding the appropriate number of control cabinets; it’s likely that there are no such requirements in the regulations. I’d like to hear everyone’s suggestions. In our drawings, all cables are routed to the control room through cable trays; the nine 800-type cable trays are too small and forced to fit there.
. . . With over 70 cabinets, you can just set up an instrument cabinet room on site, right? . . Your regular control cabinets cannot be placed in outdoor locations at the moment; not only are they exposed to wind, sun, and rain, but there’s also no such thing as explosion-proof versions of them. They all rely on positive pressure ventilation, and the instruments used are quite delicate – without proper control over temperature and humidity, they tend to get damaged easily. Of course, foreign manufacturers now also offer products with the card slot at the front, but they are quite expensive. As for the standards, if it comes to safety or SIS systems, cards are not allowed to be installed on-site. As for controllers, whether they are related to safety or not, they also cannot be installed on-site, because in the event of an accident at the site, the controller will be lost and complete control will be lost. Finally, did you use those over 70 cabinets, left bare on the floor, as walls? That’s too much.
Explosion-proof cabinets with positive pressure ventilation are no longer allowed to be used in explosion-proof workshops!
This is the plan provided by the manufacturer to the owner; they kept asking us to draw according to it, but we kept delaying and didn’t do it. He installed a signal acquisition card; there is no CPU. I just asked them about the outdoor location – it’s over 100 meters away from the tanks. Initially, it was planned to install it on the tanks themselves, but the owner refused to allow that. Now they plan to install it outside the tank area. With what you’re saying, it seems like it will end up right next to the wall
There are too many pneumatic valves in the tank area; the valve manufacturer suggests creating a valve island equipped with data acquisition cards
If it’s just for collection, there’s no major issue; talk to them again. If it are explosion-proof boxes, placing them on top of the tanks is also acceptable. But it’s generally not recommended to use large cabinets; also, how will you handle the power supply? Is it necessary to draw over 70 circuits of electricity?
I would like to ask whether the prohibition on placing controllers on-site is a requirement of the SIS regulations or those related to explosion-proof areas Is there a specific source? Thank you
For flame-proof cabinets, heat dissipation might be an issue to consider.
It’s like this: we had a project before where we considered using pre-installed cards, placing the SIS cards on-site, but that idea was rejected by the safety supervision agency. Even though they had SIL certification, it wasn’t accepted. Actually, we didn’t find the source either, but they said it’s not possible because it’s unsafe; there’s nothing we can do about it. .
With so many, even if there are just a few units, a dedicated cabinet room or control room is necessary; at the very least, it should be located in a non-explosive area! Safety is the top priority; cable costs are considered only afterward. Moreover, the price of many explosion-proof cabinets also doubles!