Do your pressure vessels design meet RAGAGEP requirements for "pressure differential" between set point and operating pressure? (NB-23)
I have written about this topic several times, but in reading the newest edition (2015) of NATIONAL BOARD INSPECTION CODE I came across some actual language that must be considered when establishing our Safe Upper Design Limits for our pressure vessels. I feel like I must state the obivious once again - a relief valve is NOT a pressure control valve! It should ONLY lift as a LAST RESORT to protect the vessel from being over pressurized. Any time we have an event where a RV has lifted, it MUST BE investigated as a serious incident! I have highlighted the language that is most critical... |
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