SUBSECTION B

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UW-52 (b1) Minimum Extent of Spot Radiographic Examination (1) One spot shall be examined on each vessel for each 50 ft (15 m) increment of weld or fraction thereof for which a joint efficiency from column (b) of Table UW-12 is selected. However, for identical vessels or parts, each with less than 50 ft (15 m) of weld for which a joint efficiency from column (b) of Table UW-12 is selected, 50 ft (15m) increments of weld may be represented by one spot examination. Table UW-12 Type number 2 1 Joint Categorie s A, B, C & D A, B, C & D A, B & C Degree of Radiographic Examination. (a) Full 1.00 0.90 0.90 (b) Spot 0.85 0.80 0.80 None 0.7 0.65 0.65 One spot shall be examined on each vessel (or other identical vessels) for each 50 ft (15m) increment of weld. Fion Zhang/ Charlie Chong UW-52
This rule also addresses smaller, often machine welded vessels such as small air receivers. One is picked at random for spot radiography. If it passes, all are approved. One spot shall be examined on each vessel (or other identical vessels) for each 50 ft (15 m) increment of weld. 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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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 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: In-progress RT for quality improvem
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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