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SUBSECTION B REQUIREMENTS PERTAININ
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PART UW Overview Fion Zhang/ Charli
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Type number Joint description Limit
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UW-2 SERVICE RESTRICTIONS. Fion Zha
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UW-2 SERVICE RESTRICTIONS Class a b
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UW-2 Class a Description. Vessels a
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WELDED JOINT CATEGORY ASME VIII pre
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• Cat “A” includes all longit
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Non-hemispherical head Critical Cir
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• Cat B includes most circumferen
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• Cat D includes welded joints co
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The main content relates to two are
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(d) Except when the longitudinal jo
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staggered or separated by a distanc
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Based on the ASME Code requirement
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Fion Zhang/ Charlie Chong UW-11
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Item 3: All butt welds in an unfire
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RT Item Note Joint Efficiency (Type
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UCS-57 RADIOGRAPHIC EXAMINATION In
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UW-11(a2) all butt welds in vessels
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UW-11 RADIOGRAPHIC AND ULTRASONIC E
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UW-11(a) Full Radiography (1) all b
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Except as required by UHT-57(a), Ca
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Any vessel with welded joint exceed
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in which case: (a)Category A and B
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(7) ultrasonic examination in accor
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Full Radiography means UW-11 (a-5):
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Radiographic examination is not req
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UW-11(d,e,f) Special welding proces
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http://www.mechanicalengine eringbl
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Fion Zhang/ Charlie Chong UW-11
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UW-12 JOINT EFFICIENCIES Fion Zhang
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Summary of weld types: Type 1: Full
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Type number Joint description Limit
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Type number Joint description Limit
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Summary Maximum Weld Joint Efficien
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Butt joints as attained by double-w
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TABLE UW-12 MAXIMUM ALLOWABLE JOINT
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Weld type number 1: Single “V”
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Type number Joint description Limit
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Type number Joint description Limit
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Type number Joint description Limit
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GENERAL NOTES: (a) The single facto
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UW12(d) Seamless vessel sections or
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UW12(d) • all Category A welds ar
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Q. Given a seamless head or shell s
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Hemispherical head • 100% RT UW-5
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Fion Zhang/ Charlie Chong UW-12
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Fion Zhang/ Charlie Chong UW-12
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Fion Zhang/ Charlie Chong UW-12
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Fion Zhang/ Charlie Chong UW-12
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FIG. UW-16.1 SOME ACCEPTABLE TYPES
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t c = not less than the smaller of
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Exercise: Problem: A nozzle is bein
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FIG. UW-16.1 SOME ACCEPTABLE TYPES
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Fion Zhang/ Charlie Chong UW-16
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Fion Zhang/ Charlie Chong UW-16
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• t = nominal thickness of vessel
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where it meets a set-on nozzle, by
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Q3. ASME VIII section UW-16 (c) fig
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Q5. ASME VIII section UW-16 (d)(1)
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UW-40(f ) The term nominal thicknes
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UW-40(a), the soak band shall conta
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fillet welds, the nominal thickness
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