Alarms representation Alarms representation mareyesf (Computer) (OP) 17 Jul 12 10:27 Hi, please collaboration with the following question, which one is the right way (see attached) to represent the instrument alarms in the P&ID?, either way is correct? Regards, RE: Alarms representation xnuke (Electrical) 17 Jul 12 15:06 The representation on the left doesn't show any alarm function explicitly but is compact. The representation on the right shows all of the alarm functions explicitly but takes up a ton of space on a P&ID. While neither is incorrect per ANSI/ISA-5.1-2009 as long as you document what they mean, I like a middle ground as shown in the attached file. It shows more functionality than the left representation, but is fairly compact. xnuke "Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged. Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips. http://files.engineering.com/getfile.aspx?folder=94613989-32c2-4ed3-9543-5c RE: Alarms representation controlnovice (Electrical) 9 Aug 12 13:35 My response would have been that the one on the left saves space on the P&ID and still reflects the idea of what you have. However, I really like xnuke's idea and is a better representation of what you have. ______________________________________________________________________________ This is normally the space where people post something insightful.