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What Is The Blow Down Of A Section Viii Or Non-code Safety Valve? |
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Answer» The ASME Boiler and Pressure Vessel Code does not have blow down requirements for SECTION VIII (or non-code) valves. Blow down may vary from less than 2% to more than 50%, depending on many factors including; valve DESIGN, dimensional tolerance VARIATION, where the set pressure falls in the set pressure range of a SPRING, spring rate/force ratio, WARN ring/guide settings, etc. Typical blow down for most valves is 15% to 30%, but cannot be guaranteed. The ASME Boiler and Pressure Vessel Code does not have blow down requirements for Section VIII (or non-code) valves. Blow down may vary from less than 2% to more than 50%, depending on many factors including; valve design, dimensional tolerance variation, where the set pressure falls in the set pressure range of a spring, spring rate/force ratio, warn ring/guide settings, etc. Typical blow down for most valves is 15% to 30%, but cannot be guaranteed. |
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