03_PPP_TTE_VLS_AND_API_510.ppt - INSPECTING PRESSURE...

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© Matthews Engineering Training Ltd INSPECTING PRESSURE VESSELS (INCLUDING API 510)
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© Matthews Engineering Training Ltd Try this What are the major design differences between these two vessels ?
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© Matthews Engineering Training Ltd Vessel design Design has an effect on : Where the greatest stresses are Which locations are most critical for defects Key areas for inspection
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© Matthews Engineering Training Ltd Key design issues related to inspection 1.Shell stresses 2.Head/shell ‘discontinuity’ stresses 3.The principles of compensation 4.Shell distortions
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© Matthews Engineering Training Ltd Shell stresses 1
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© Matthews Engineering Training Ltd 2 basic sets of assumptions: Thick shell assumptions (mainly headers) Thin shell assumptions (just about everything else) Membrane theory (easy) Lame equations (more complex)
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© Matthews Engineering Training Ltd So,membrane theory is the main one of relevance for inspectors This assumes that a vessel shell is 2-dimensional
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© Matthews Engineering Training Ltd Shell welds Which weld is the most critical and why? Longitudin al Circumferenti al
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© Matthews Engineering Training Ltd Shell stresses This is why longitudinal welds are type ‘A’ in ASME V111
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© Matthews Engineering Training Ltd The evidence
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© Matthews Engineering Training Ltd Head-to-shell stresses 2
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© Matthews Engineering Training Ltd The head/shell joint P How is the shell trying to deform? What effect is the head having
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© Matthews Engineering Training Ltd The result is: HERE
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© Matthews Engineering Training Ltd What affects the size of the head/shell discontinuity stress?
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© Matthews Engineering Training Ltd Discontinuity stresses Types of head: Ellipsoidal, Torispheroidal Note the a:b ratio What is this for
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© Matthews Engineering Training Ltd How far down the shell do the discontinuity stresses extend?
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