![]() ![]() FC is a flow controller, FY symbol is an I/P transducer, and FV is a flow control valve. FT in the leftmost bubble indicates the item is a flow transmitter. In the above figure, the F in the first position indicates a flow control item. The second or third letters are modifiers. The functional identification consists of a first letter (designating the measured or initiating variable for example, F for Flow, T for Temperature, etc.). In the sample P&ID diagram shown in the above figure, F is the first letter in the tag number that is used for the instruments in the flow control loop. P&ID Functional Identification General Rules ![]() The most important English language ones are BS 1646 and ISA S5.1.Ģ. There are several national standards which relate to the representation of instrumentation and control schemes. If there is no standard set by the factory, the symbology will normally be based on the ISA-5.1-1984 standard (R1992) Whilst there are many differences in detail between them, the basic symbols and letter code structure are essentially the same. The tag guidelines should be uniform throughout the plant.Īlso, most major companies have their own internal standards. It is very important that the standards used in your facilities are fully defined and rigidly followed. Sometimes however, you will find that additional information or interesting interpretations are added to better define the local requirements, to meet the specific requirements of the system or even to maintain the tradition of the site. The identification standard of the elements connected to the process control for most industrial installations is based on ISA-5.1. Good documentation is the basis for good engineering and good maintenance of the facilities. The reason is quite simple, users of instrumentation and control systems need some method to identify the equipment so that they can administer the engineering, the purchases, the installation and the maintenance of those systems.īut the identification must follow some basic rules to have a good documentation. This third article on P&ID diagrams deals with the functional identification and the conventions when naming the elements present in a P&ID diagram. ![]()
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