Selection of instruments for the fire pump room
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This post was last edited by wyzglj on 2022-11-7 at 18:16. Recently, the factory needs to renovate the fire pump room; local pressure gauges are required to be installed in front of and behind several fire pumps, and flow meters need to be installed at their outlets. There is no need to connect them to any control system or control panel. However, the requirements set by the process engineering team for the pressure before the pump are a minimum of -50 KPa and a maximum of +20 KPa; therefore, it is planned to use a vacuum pressure gauge. Yet, the standard GB50974-2014 requires an accuracy level of 0.4%. Have anyone used local pressure gauges with such an accuracy level? How large should the dial be? Also, the flow meter was originally supposed to have an on-site display, but an accuracy of 0.4% was required; it seems that an electromagnetic type with a remote transmission signal will be needed. Have you all used electromagnetic flowmeters without remote transmission? So, is it not necessary to use a transmitter either, and can the display be done directly on-site? Thank you very much for your kind advice.
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For electromagnetic flowmeters without remote transmission, you just don’t need to connect any wires. But if you don’t want a transmitter, how will the excitation coil be powered? What do you think of the excitation signal?
Of course, you can buy a wireless electromagnetic flow meter that runs on batteries.
Well, I originally wanted to save costs by using an on-site flow display, but the accuracy wasn’t up to standard; so I had to use one with a transmitter, powered by 220 volts. The signal at the remote end is not connected.
For the level control of the outdoor large fire water tank, is it sufficient to have alarm functions displayed in the fire control room and the fire pump room, without the need to integrate it into a control system? What are the commonly used design options?
The valve with the lowest cost is definitely the float valve. However, it sometimes doesn’t close properly, which can lead to overflow. For the level gauge, an immersion type level gauge will suffice.
Valves are not required. The level gauge is required to provide alarms in both the fire control room and the fire pump room; it is located about 50 meters away from the fire pump room and about 500 meters away from the fire control room. Are there any recommended products for this purpose?
Domestic submersible types cost a few hundred yuan each; they operate on a 4-20mA signal. The fire pump room should be equipped with cards, so the signals from it are transmitted to the fire control room in phase one
There is no control system; it only needs to display alarms. So there are no cards; I just want to display the information in two places, which means I need two digital displays. Is this distance a bit too great? Are there any suitable products you can recommend?
There are many on Taobao; you can just buy any of them. That’s too harsh of you; I remember that fire pump rooms are equipped with PLCs