As many of us are aware, ASME Sec VIII Div 1 UG-136(a)(3) requires relief valves in air, water exceeding 140°F (60°C), and steam service to have a lifting lever. My question is does anyone know why these specific services require a lifting lever but not others?
I am aware of code case 2203, in this instance I am just wondering what the underlying concern was to warrant this clause.
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