draf.ing, the P&ID editor

Field notes

The page separates human judgment from standardized geometry: users place symbols and connect nozzles, while the engine handles dimensions, routing, crossing hops, and tag checks. Its visible catalogue covers 17 line classes, 20 device outlines, and 12 equipment outlines, with a sample sheet showing four symbols, three lines, and passed checks. The stated validation rules include three-digit minimum numerals, duplicate-tag rejection, and function-letter checks against Table 4.1.