Hello Friends do you know this answer of this Question? Which color you would use when there is Somthing not correct or need to change In P&ID? i mean color that use for highlight that need to update in P&ID.
Yellow Highlighter ?
Red color ?
Blue Color ?
Appreciate for your answer.
Thanks
Blue Color

Answer Posted / engineer

Red colour is for correction or as built
Green colour for erasing 
Blue colour for addition

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