SUBSECTION B

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Lethal service Cat. C Cat. B Cat. D Cat. A Fion Zhang/ Charlie Chong UW-2
UW-2 Class a Description. Vessels are to contain lethal substance. Service restrictions Following key points: 1. Butt-welded joints must be fully radiographed. 2. Carbon or low alloy steel vessels need PWHT. 3. Cat A joints need to be type 1 welds (double welded) (the types are given in table UW-12). 4. Cat B joints can be either type 1 or type 2 (single welded - single V with backing strip). 5. Cat D must be full penetration welds .* note1 Note1: For radiography joints only type 1 & 2 are allowed. Fion Zhang/ Charlie Chong UW-02
Page 1 and 2: SUBSECTION B REQUIREMENTS PERTAININ
Page 3 and 4: PART UW Overview Fion Zhang/ Charli
Page 5 and 6: Type number Joint description Limit
Page 7 and 8: UW-2 SERVICE RESTRICTIONS. Fion Zha
Page 9: UW-2 SERVICE RESTRICTIONS Class a b
Page 13 and 14: WELDED JOINT CATEGORY ASME VIII pre
Page 15 and 16: • Cat “A” includes all longit
Page 17 and 18: Non-hemispherical head Critical Cir
Page 19 and 20: • Cat B includes most circumferen
Page 21 and 22: • Cat D includes welded joints co
Page 23 and 24: The main content relates to two are
Page 25 and 26: (d) Except when the longitudinal jo
Page 27 and 28: staggered or separated by a distanc
Page 29 and 30: Based on the ASME Code requirement
Page 31 and 32: Fion Zhang/ Charlie Chong UW-11
Page 33 and 34: Item 3: All butt welds in an unfire
Page 35 and 36: RT Item Note Joint Efficiency (Type
Page 37 and 38: UCS-57 RADIOGRAPHIC EXAMINATION In
Page 39 and 40: UW-11(a2) all butt welds in vessels
Page 41 and 42: UW-11 RADIOGRAPHIC AND ULTRASONIC E
Page 43 and 44: UW-11(a) Full Radiography (1) all b
Page 45 and 46: Except as required by UHT-57(a), Ca
Page 47 and 48: Any vessel with welded joint exceed
Page 49 and 50: in which case: (a)Category A and B
Page 51 and 52: (7) ultrasonic examination in accor
Page 53 and 54: Full Radiography means UW-11 (a-5):
Page 55 and 56: Radiographic examination is not req
Page 57 and 58: UW-11(d,e,f) Special welding proces
Page 59 and 60: 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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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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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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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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• 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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The nominal thickness 6. When a wel
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Mr. “t” the nominal thickness (
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Mr. “t” the nominal thickness e
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UW-50 NONDESTRUCTIVE EXAMINATION OF
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UW-51 RADIOGRAPHIC EXAMINATION OF W
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10-13 RECORDS RETENTION a) The Manu
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(c) For manufacturers of UM stamped
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When do you need full RT Fion Zhang
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UW-11, a(2). All materials; welded
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UW-11 (a3) all butt welds in the sh
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UW-11 (a6) all butt welds joined by
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UW-51 (a2) A written radiographic e
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Demonstration of (1) density and (2
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Demonstration of (1) density and (2
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• Repaired welding, at the option
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Unacceptable imperfections UW-51 (b
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UW-51 (b3) any group of aligned ind
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UW-51 (b2) http://www.ndted.org/Edu
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In-progress RT for quality improvem
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This rule also addresses smaller, o
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UW-52 (b2) For each increment of we
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Welder-C Welder-B Welder-A Under co
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UW-52 (b3) Each spot examination sh
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UW-52 (b4) Radiographs required at
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UW-52 (b4) Radiographs required at
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UW-52 (c) Standards for Spot Radiog
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Spot radiographs may be retained or
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UW-51 (b2) t = the thickness of the
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UW-52(d) Evaluation and Retests UW-
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UW-52(d) Evaluation and Retests (1)
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Fion Zhang/ Charlie Chong
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SUBSECTION B

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