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jt, Thanks for your response. I am in the USA, North Carolina, and i'm familiar with OSHA and it's energy isolation requirements. What I was trying to ask, is there a specific code, standard, or regulation that requires double block and bleed valves when there are 2 or more boilers...

In thread408-48267 on 10Mar03, davefitz (Mechanical) posted a comment stating,"double block and bleed is required by code in section I (boiler) service if there are 2 or more boilers interconnected on a common steam line and the boilers have a manway in the steam drum. This is to avoid cooking...