When was the last time you checked your PSI legend sheet?

You know that first sheet in the pile of P&IDs that shows the legend for all your symbols? When was the last time you looked at it? Is it up to date with your current drawing guidelines and your current processes? It may surprise you that those symbols and abbreviations change over time. Take a few minutes and review, it may save you a big headache during a future audit, and it will help your personnel know what is going on with your process.