Today I got one of my favorite magazines, of which I have been suggesting everyone in the PSM arena subscribe to (for FREE) – The BULLETIN from the National Board. And in this edition, the NB has an article on the Hanson RV that has an indicator telling when the valve has been activated. These are a really nice addition to any process safety efforts, but in the NH3 refrigeration industry where almost all RV systems are manifolded together, they should almost be mandatory because of their ability to alert personnel when RV is lifted. But with these process improvements, come several changes to our process safety management systems and this calls for a MOC. Here are the potential impacts on our documentation that would suggest a MOC is in order to manage this change: