SUBSECTION B

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UW-52(d) Evaluation and Retests Spot RT unacceptable, 2 additional spots in the same increment Spot RT acceptable Both Spot RT acceptable Any of the Spot RT unacceptable the entire weld increment represented the radiographic testing is acceptable the entire weld increment represented by the three radiographs is unacceptable Fion Zhang/ Charlie Chong UW-52
UW-52(d) Evaluation and Retests UW-52(d2b) If either of the two additional spots examined shows welding which does not comply with the minimum quality requirements of (c)(1) or (c)(2) above, the entire increment of weld represented shall be rejected. 1. The entire rejected weld shall be removed and the joint shall be rewelded or, at the fabricator’s option, 2. the entire increment of weld represented shall be completely radiographed and only defects need be corrected. UW-52(d2c) Repair welding shall be performed using a qualified procedure and in a manner acceptable to the Inspector. The rewelded joint, or the weld repaired areas, shall be spot radiographically examined at one location in accordance with the foregoing requirements of UW-52. Fion Zhang/ Charlie Chong UW-52
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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
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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
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 and 160: Unacceptable imperfections UW-51 (b
Page 165 and 166: UW-51 (b3) any group of aligned ind
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: UW-51 (b2) t = the thickness of the
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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