Newbies ask for advice on how to draw P&ID
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This post was last edited by wangjh0814 on 2018-11-1 08:44. Is the electromagnetic flowmeter with on-site display and the signal transmitted to the control cabinet as shown in the picture correct? In addition, I drew it using AutoCAD P&ID. In the project report, there are two instruments in the instrument list, but there is actually one instrument. How to solve this situation?
The national standard chart I have seen is indeed like this. I would like to make a small comment. Fit is usually ft now.
As mentioned above, FIT is now generally expressed as FT and can be omitted directly.
“You can also omit it directly." Is it to omit the entire symbol and only keep the symbol of the circle inscribed in the square?
This post was last edited by wangjh0814 on 2018-11-1 11:18. Sorry. Is that so?
Yours is a pure flow display. You need to understand what each letter represents. F stands for flow, T stands for transmission, and I stands for display. Look at the pictures and information below. As a craftsman, I think instrumentation and automatic control knowledge is also a must.
For on-site display, if you have data transmission, just use FT. If you have transmission control, just use I. For example, FIC, TIC, LIC
This post was last edited by wangjh0814 on 2018-11-1 16:15 According to the information on the 7th floor, I represents the indication function, so what is the difference between indication and on-site display? What is the difference between data transmission and transmission control? We now need to install an electromagnetic flowmeter on the pipeline, which must have an on-site display function, and then transmit the data to the control cabinet, and the flow rate must also be displayed on the touch screen. ； So how to draw on the P&ID?
Transmission is not difficult to understand. Transmission means that according to the flow indication of the flow meter, the opening of the flow valve at the back can be adjusted on the DCS to adjust the flow. The transmission meter is usually followed by a pneumatic valve. The instrument logic is the FV control behind the FIC control.； Some local tables are only displayed on the on-site table, and some are displayed on the on-site table and can also be transmitted to the central control for display on the DCS interface. You can just draw an FT according to your needs. It is recommended that you find a picture to have a better understanding.
The first picture is relatively accurate. The squares on the pipeline represent sensors, where the letter M represents electromagnetic ； The circle above it represents the flow transmitter, the letter F represents flow, I represents indication, and T represents transmission. Some electromagnetic flowmeters have on-site instructions. If on-site instructions are not emphasized, the letter I can be omitted. ； If the sensor and transmission part of the electromagnetic flowmeter are integrated instruments, the FIT circle can be tangent to the M square.