SUBSECTION B

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Unacceptable imperfections UW-51 (b1) UW-51 (b2) UW-51 (b1) indication characterized as a crack or zone of incomplete fusion or penetration; Fion Zhang/ Charlie Chong UW-51
Unacceptable imperfections UW-51 (b2) UW-51 (b2) any other elongated indication on the radiograph which has length greater than: (a) ¼ in. (6 mm) for t up to ¾ in. (19 mm) (b) ⅓ t for t from ¾ in. (19 mm) to 2 ¼ in. (57 mm) (c) ¾ in. (19 mm) for t over 2 ¼ in. (57mm) Fion Zhang/ Charlie Chong UW-51
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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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UW-12 JOINT EFFICIENCIES Fion Zhang
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Summary of weld types: Type 1: Full
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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
Page 109 and 110: FIG. UW-16.1 SOME ACCEPTABLE TYPES
Page 111 and 112: Fion Zhang/ Charlie Chong UW-16
Page 113 and 114: Fion Zhang/ Charlie Chong UW-16
Page 115 and 116: • t = nominal thickness of vessel
Page 117 and 118: where it meets a set-on nozzle, by
Page 119 and 120: Q3. ASME VIII section UW-16 (c) fig
Page 121 and 122: Q5. ASME VIII section UW-16 (d)(1)
Page 123 and 124: UW-40(f ) The term nominal thicknes
Page 125 and 126: UW-40(a), the soak band shall conta
Page 127 and 128: fillet welds, the nominal thickness
Page 129 and 130: The nominal thickness 6. When a wel
Page 131 and 132: Mr. “t” the nominal thickness (
Page 133 and 134: Mr. “t” the nominal thickness e
Page 135 and 136: UW-50 NONDESTRUCTIVE EXAMINATION OF
Page 137 and 138: UW-51 RADIOGRAPHIC EXAMINATION OF W
Page 139 and 140: 10-13 RECORDS RETENTION a) The Manu
Page 141 and 142: (c) For manufacturers of UM stamped
Page 143 and 144: When do you need full RT Fion Zhang
Page 145 and 146: UW-11, a(2). All materials; welded
Page 147 and 148: UW-11 (a3) all butt welds in the sh
Page 149 and 150: UW-11 (a6) all butt welds joined by
Page 151 and 152: UW-51 (a2) A written radiographic e
Page 153 and 154: Demonstration of (1) density and (2
Page 155 and 156: Demonstration of (1) density and (2
Page 157 and 158: • Repaired welding, at the option
Page 159: Unacceptable imperfections UW-51 (b
Page 163 and 164: Unacceptable imperfections UW-51 (b
Page 165 and 166: UW-51 (b3) any group of aligned ind
Page 167 and 168: Unacceptable imperfections UW-51 (b
Page 169 and 170: UW-51 (b2) http://www.ndted.org/Edu
Page 171 and 172: In-progress RT for quality improvem
Page 173 and 174: This rule also addresses smaller, o
Page 175 and 176: UW-52 (b2) For each increment of we
Page 177 and 178: Welder-C Welder-B Welder-A Under co
Page 179 and 180: UW-52 (b3) Each spot examination sh
Page 181 and 182: UW-52 (b4) Radiographs required at
Page 183 and 184: UW-52 (b4) Radiographs required at
Page 185 and 186: UW-52 (c) Standards for Spot Radiog
Page 187 and 188: Spot radiographs may be retained or
Page 189 and 190: UW-51 (b2) t = the thickness of the
Page 191 and 192: UW-52(d) Evaluation and Retests UW-
Page 193 and 194: UW-52(d) Evaluation and Retests (1)
Page 195 and 196: Fion Zhang/ Charlie Chong
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SUBSECTION B

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