SUBSECTION B

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Type number Joint description Limitations Joint Categories Degree of Radiographic Examination. Full Spot None 2 •Single-welded butt joint with backing strip other than those included under (1) (a) None except as in (b) below (b) Circumferential butt joints with one plate offset; see UW-13(b) (4) and Fig. UW-13.1, sketch (i) A, B, C & D A, B & C 0.90 0.90 0.80 0.80 0.65 0.65 Fion Zhang/ Charlie Chong UW-12
Type number Joint description Limitations Joint Categories Degree of Radiographic Examination. Full Spot None 3 Single-welded butt joint with out used of backing strip. Circumferential butt joints only, not over 5⁄8 in. (16 mm) thick and not over 24 in. (600 mm outside diameter) A, B, C NA NA 0.6 4 Double full fillet lap joint. (a) Longitudinal joints not over 3/8 in. (10mm) thick A NA NA 0.55 (b) Circumferential joints not over 5/8 in. (16mm) thick. B, C [note 3] NA NA 0.55 5 Single full fillet lap joints with plug welds conforming to (a) Circumferential joints [Note 4 (exclude hemispherical) ] for attachment of heads not over 24 in. (600 mm) outside diameter to shells not over 1⁄2 in. (13 mm) thick. B NA NA 0.50 (b) Circumferential joints for the attachment to shells of jackets not over 5⁄8 in. (16 mm) in nominal thickness where the distance from the center of the plug weld to the edge of the plate is not less than 1 ½ times the diameter of the hole for the plug. C NA NA 0.50 Fion Zhang/ Charlie Chong UW-12
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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
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
Page 63 and 64: UW-12 JOINT EFFICIENCIES Fion Zhang
Page 65 and 66: Summary of weld types: Type 1: Full
Page 67: Type number Joint description Limit
Page 71 and 72: Summary Maximum Weld Joint Efficien
Page 73 and 74: Butt joints as attained by double-w
Page 75 and 76: TABLE UW-12 MAXIMUM ALLOWABLE JOINT
Page 77 and 78: Weld type number 1: Single “V”
Page 79 and 80: Type number Joint description Limit
Page 85 and 86: GENERAL NOTES: (a) The single facto
Page 87 and 88: UW12(d) Seamless vessel sections or
Page 89 and 90: UW12(d) • all Category A welds ar
Page 91 and 92: Q. Given a seamless head or shell s
Page 93 and 94: Hemispherical head • 100% RT UW-5
Page 103 and 104: FIG. UW-16.1 SOME ACCEPTABLE TYPES
Page 105 and 106: t c = not less than the smaller of
Page 107 and 108: Exercise: Problem: A nozzle is bein
Page 109 and 110: FIG. UW-16.1 SOME ACCEPTABLE TYPES
Page 115 and 116: • t = nominal thickness of vessel
Page 117 and 118: 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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