Type of Discontinuity Cheat Sheet
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Type of Discontinuity Full Radiography Spot Radiography Cracks Burn-Through: (BT) Internal Concavity (IC) (See ASME Section VIII, Div. I: UW-51) Nominal Thickness Max. Length (See ASME Section VIII, Div. 1: UW-51) Max. Slag Length < 3/4" 1/4" < 3/4" 1/4" 3/4" to 2-1/4" 1/3t 3/4" to 2-1/4" 1/3t >2-1/4" 3/4" >2-1/4" 3/4" (See ASME Section VIII, Div. 1:App. 4) (See ASME Section VIII, Div. 1: UW-51) Nominal Thickness Other welds Nominal Thickness Tw Max. Height Tw Max. Height Not Covered Plate thickness Max. Reinforcement Maximum Reinforcement, in. 1/16" 1/16" 1/16" Other Welds >1/4" to 1/2" 1/8" >1/4" to 1/2" 1/8" >1/2" to 1" 3/32" >1/2" to 1" 5/32" >1/2" to 1" 5/32" >1" 1/8" Over 1" 3/16" Over 1" 3/16" (See Notes 1 & 2) (See Notes 1 & 2) Nominal Thickness Circum. Joint Nominal Thickness Vert. Misalignment Horiz. Misalignment Circum. Joint Longit. Joint Thickness Maximum Thickness Maximum NOT COVERED NOT COVERED NOT COVERED NOT COVERED NOT COVERED NOT COVERED NOT COVERED General Notes and Other NDE For UT: See 136.4.6 Note 1:Tw is the nominal wall thickness of the thinner of two components being joined by a butt weld. Note 6: L - Is the length of the longest indication under consideration. Note 2: The height of reinforcement or internal protrusion in any plane through the weld shall be within the limits shown. Note 3: Reference ASME Section VIII, Division 1 (Appendix 4). Note 8: Any misalignment within these tolerances shall be faired at a 3:1 taper or re-aligned. PRESSURE VESSELS ASME Sect VIII Div I: (2001 Edition) PROCESS PIPING ASME B31.3 1999 EDITION (See Note 7) PIPELINES API STD 1104: 19th Edition STORAGE TANKS API STD 650: Tenth Edition BOILERS ASME SECTION I: 2001EDITION POWER PIPING ASME B31.1 2001 EDITION SEVERE CYCLIC CONDITIONS (100% RADIOGRAPHY) NORMAL FLUID SERVICES (5% RADIOGRAPHY) NONE ALLOWED UW-51 NONE ALLOWED UW-52 NONE ALLOWED Table 341.3.2 NONE ALLOWED Table 341.3.2 Linear Cracks NOT ALLOWED. Shallow crater/star cracks < 5/32" long are acceptable. (9.3.10) NONE ALLOWED (See ASME Section VIII, Div. I: UW-51) NONE ALLOWED PW-51 NONE ALLOWED 136.4.5 Incomplete Penetration: Root Pass (IP) NONE ALLOWED UW-51 NONE ALLOWED UW- 52 NONE ALLOWED Table 341.3.2 Maximum of 1/32" and 20% of wall thickness. Maximum length of 1.5" in 6" of weld. NONE ALLOWED IN LONGITUDINAL WELDS. Table 341.3.2 Maximum of 1" length for individual indication; Combined total of indications maximum of 1" length in any continuous 12" of weld, or 8% of the weld length if less than 12" (9.3.1) NONE ALLOWED (5.3.2.1) NONE ALLOWED PW-51 NONE ALLOWED 136.4.5 Incomplete Penetration: Due to High/Lo Fit-up or Cross Penetration (IPD) or (ICP) NONE ALLOWED UW-51 NONE ALLOWED UW- 52 NONE ALLOWED Table 341.3.2 Maximum of 1/32" and 20% of wall thickness. Maximum length of 1.5" in 6" of weld. NONE ALLOWED IN LONGITUDINAL WELDS. Table 341.3.2 IPD-Maximum individual length of 2". Maximum aggregate length of 3" in 12" of continuous weld. ICP-Max individual length 2". Max aggregate length of 2" in any 12" of continuous weld. (9.3.2) and (9.3.3) NONE ALLOWED (5.3.2.1) NONE ALLOWED PW-51 NONE ALLOWED 136.4.5 Incomplete Fusion: Root Pass or Surface (IF) NONE ALLOWED UW-51 NONE ALLOWED UW- 52 NONE ALLOWED Table 341.3.2 NONE ALLOWED Table 341.3.2 Maximum of 1" length for individual indication; Combined total of indications maximum of 1" length in any continuous 12" of weld, or 8% of the weld length if less than 12". (9.3.4) NONE ALLOWED (5.3.2.1) NONE ALLOWED PW-51 NONE ALLOWED 136.4.5 Incomplete Fusion: Sidewall or Between Beads (Cold- Lap) (IFD) NONE ALLOWED UW-51 NONE ALLOWED UW-52 NONE ALLOWED Table 341.3.2 NONE ALLOWED Table 341.3.2 Maximum of 2" length for individual indication; Combined total of indications maximum of 2" in length in any continuous 12" of weld, or 8% of the weld length if less than 12". (9.3.5) NONE ALLOWED (5.3.2.1) NONE ALLOWED PW-51 NONE ALLOWED 136.4.5 Not Specifically Covered (See Elongated or Round Indications Below) UW-51 Not Specifically Covered (See Elongated or Round Indications Below) UW-52 Not Specifically Covered (See Elongated or Round Indications Below) Table 341.3.2 Not Specifically Covered (See Elongated or Round Indications Below) Table 341.3.2 Maximum dimension shall not exceed 1/4" or the thinnest of the pipe wall thicknesses being joined. The sum of the maximum dimensions of separate burn-throughs shall not exceed 1/2" in any continuous 12" of weld, or the total weld length, whichever is less. The density of any portion or it's image shall not exceed that of the thinnest adjacent base metal. (9.3.7) NOT SPECIFICALLY COVERED (See Elongated or Rounded Indications Below) NOT SPECIFICALLY COVERED (See Elongated or Rounded Indications Below) (Same as ASME Section I) 136.4.5 Smoothly contoured concavity permitted if equal weld reinforcement is provided UW-35.d RT Smoothly contoured concavity permitted if equal weld reinforcement is provided UW-35.d RT Internal concavity shall not reduce the total thickness of the joint, including allowable reinforcement, to less than the thickness of the thinner of the components being joined. Table 341.3.2 Internal concavity shall not reduce the total thickness of the joint, including allowable reinforcement, to less than the thickness of the thinner of the components being joined. Table 341.3.2 For an area exceeding the density of the thinnest base metal, see the criteria for Burn-Through. (9.3.6) Smoothly contoured concavity permitted if equal weld reinforcement is provided. PW-35.1 Root concavity not allowed when there is an abrupt density change. Undercut: Root or Cap Pass (UC) VT (UW-35) The weld must be free of ripples, groves, over laps, abrupt ridges or valleys. Reduction in the thickness from welding shall not exceed 1/32" or 10%t RT (UW-51) (See Elongated or Rounded Indications Below) VT (UW-35) The weld must be free of ripples, groves, over laps, abrupt ridges or valleys. Reduction in the thickness from welding shall not exceed 1/32" or 10%t RT (UW-52) (See Elongated Indications Below) NONE ALLOWED Table 341.3.2 VT ONLY: Maximum depth of 1/32" and 25% of wall thickness. NONE ALLOWED IN LONGITUDINAL WELDS. Table 341.3.2 Total length of internal and external undercut shall not exceed 2" in 12" of weld. The total accumulative shall not exceed 1/6" of the weld length. (9.3.11) VT Vertical Butt Joints: 1/64" Maximum. Horizontal Butt Joints: 1/32" Maximum. Attachment Welds: 1/64" Maximum RT (See ASME Section VIII, Div. 1: UW-51) VT (PW-35) The weld must be free of ripples, grooves, overlaps, abrupt ridges or valleys. Reduction in the thickness from welding shall not exceed 1/32" or 10% t. RT (See Elongated or Rounded Indications Below) (Same as ASME Section I) 136.4.5 General Elongated Indications and/or Slag Inclusions: (SI) Elongated Slag Inclusions (ESI) Isolated Slag Inclusions (ISI) Maximum length of 2/3 t, with 3/4" max. Maximum total length is t in a length of 6 t with 3/4" maximum. If the indications are aligned, the sum of the longest dimensions of all indications shall not exceed t in a length of 6 t and the longest indications are separated by at least 3 L. Any individual indication less than 1/4" is acceptable. UW-52 (See note 4) (See note 6) Maximum individual length: 1/3 Tw Max. width:< 1/3 Tw and 3/32" Max. cumulative length: < Tw in any 12 Tw of weld length. Table 341.3.2 (See Note 1) Maximum individual length: 2 Tw Max. width:< 1/2 Tw and 1/8" Max. cumulative length: < 4 Tw in any 6" of weld length. Table 341.3.2 (See note 1) Max. Width of ESI is 1/16". Max. combined length is ISI indications shall not exceed 8% of weld length. FOR PIPE OD < 2.375" Length of ESI indications shall not exceed 3 Tw. Combined length of ISI indication shall not exceed 2 Tw and the width not to exceed 1/2 Tw. FOR PIPE OD > 2.375" Length of ESI indication shall not exceed 2" in any continuous 12" of weld. Combined length of ISI indication shall not exceed 1/2" in any continuous 12" weld. Max. width of ISI is 1/8". Max. of 4 ISI indications with 1/8" width in any 12" of weld (9.3.8) Nominal Thickness (Same as ASME Section I) 136.4.5 Aligned indications shall not exceed t in a length of 12 t, unless the distance between successive indications exceeds 6L. UW-51 (See note 4) (See note 6) Aligned indications shall not exceed t in a length of 12 t, unless the distance between successive indications exceeds 6L. PW-51 (See Note 4) (See Note 6) Porosity or Rounded Indications: (P), (CP) & (HB) Max. size of any indication shall be the smaller of 1/4t or 5/32". Isolated indications separated from adjacent indications by 1" or more, may be the smaller of 1/3 t or 1/4". For thickness' greater than 2" the max. permissible size of isolated indications is 3/8". Aligned indications shall not exceed t in a length of 12 t. Clusters shall not exceed the lesser of 1" or 2 t. If more than one cluster, the sum of lengths shall not exceed 1" in a 6" length of weld. UW-51 (See Note 3) (See Note 4) Rounded indications are not a factor in the acceptability of welds not required to be fully radiographed. UW-52 For thickness < 1/4" see ASME Section VIII Div 1: UW-51 (Appendix 4). For thickness > 1/4", all dimensions in Appendix 4 are multiplied by 1.5 (i.e. Max. size of indication shall be .375 t or .234". Table 341.3.2 (See Note 3) (See Note 4) Spherical: Max. dimension 1/8" or 25% Tw. (9.3.9.2) Cluster: Max 1/2" diameter with max. Individual pore dimension of 1/16". Max. combined length 1/2" in an 12" of weld. (9.3.9.3) Hollow Bead: Max. length is 1/2". Combined length of indications shall not exceed 2" in any continuous 12" of weld. Individual indication greater than 1/4" in length shall be separated by > 2". Max. combined length of indications < 8% of weld length. (9.3.9.4) Max. size of any indication shall be the smaller of 1/4t or 5/32". Isolated indications separated from adjacent indications by 1" or more, may be the smaller of 1/3 t or 1/4". For thickness' greater than 2" the max. permissible size of isolated indications is 3/8". Aligned indications shall not exceed t in a length of 12 t. Clusters shall not exceed the lesser of 1" or 2 t. If more than one cluster, the sum of lengths shall not exceed 1" in a 6" length of weld. UW-51 (See Note 3) (See Note 4) (Same as ASME Section I) 136.4.5 Weld Reinforcement (VT criteria) Cat B &C butt welds Cat B &C butt welds Other welds Nom. Thickness The greater of (tm + 0.15") or 1.15tm when ordered on a minimum wall basis. The greater of (tm + 0.15") or 1.10tnom when ordered on a nominal wall basis. 127.4.2 (See Note 9) Less than 3/32" 3/32" to 3/16" incl. Over 3/16" to 1/2" incl. Over 1/2" to 1" incl. Over 1" to 2" incl. 3/32" 1/8" 5/32" 3/16" 1/4" 1/4" 1/32" 1/16" 3/32" 3/32" 1/8" 5/32" Less than 3/32" 3/32" to 3/16" incl. Over 3/16" to 1/2" incl. Over 1/2" to 1" incl. Over 1" to 2" incl. Over 2" to 3" incl. Over 3" to 4" incl. Over 4" to 5" incl. Over 5" 3/32" 1/8" 5/32" 3/16" 1/4" 1/4" 1/4" 1/4" 1/32" 1/16" 3/32" 3/32" 1/8" < 1/4" < 1/4" < 1/2" Circum. Joint <1/8" >1/8" to 3/16" >3/16" to 1/2" >1/2" to 1" >1" to 2" >2" to 3" >3" to 4" >4" to 5" 3/32" 1/8" 5/32" 3/16" The greater of 1/4" or 1/8 times the width of the weld, in 3/32" 3/32" 3/32" 3/32" 1/8" 5/32" 7/32" Note: These parameters are from the RT criteria in Para. 6.1.3.4. For the general requirements see Para. 5.2.1.5 Misalignment (VT Criteria) Longit. Joint Circum. Joint Longit. Joint The inside diameter of components at ends to be joined must be aligned within the engineering design and weld procedure. If the external surfaces of the two components are not aligned, the weld shall be tapered between the two surfaces. 328.4.3 The inside diameter of components at ends to be joined must be aligned within the engineering design and weld procedure. If the external surfaces of the two components are not aligned, the weld shall be tapered between the two surfaces. 328.4.3 Maximum of 1/8". Greater offset caused by dimensional variations shall be equally distributed around the circumference of the pipe. (7.2) Nominal Thickness 1/16" 127.3 < 1/2" >1/2" to 3/4" >3/4" to 1-1/2" >1-1/2" to 2" Over 2" 1/4t 1/4t 3/16" 1/8t Lesser of 1/4t 1/8 1/8 < 1/2" >1/2" to 3/4" >3/4" to 1-1/2" >1-1/2" to 2" Over 2" 1/4t 1/4t 3/16" 1/8t 1/4t 1/8 1/8 < 1/2" >1/2" to 3/4" >3/4" to 1- 1/2" 1/4t 1/4t 3/16" 1/8t Lesser of 1/4t 1/8 1/8 1/8 < 5/8" >5/8" 1/16" Lesser of 10%t or 1/8" < 5/16" >5/16" Max 1/16" 20% of upper plate. Max 1/8" Accumulation of Discontinuities Maximum of 2" in any 12" or 8% of weld length excluding high-lo condition. For UT: See code case 2235-2, Appendix 12, UW-11(a), and UW-51(b) For UT: See code case 2235-2, Appendix 12, UW-11(a), and UW-51(b) Ultrasonic acceptance criteria is given in Para. 344.6.2 Ultrasonic acceptance criteria is given in Para. 344.6.2 For Category M service this column applies but the coverage is 20% RT. The company may reject any weld that appears to meet theses standards, if in it's opinion, the flaw could be detrimental. For UT: Acceptance Criteria - 9.6.1 For UT: The acceptance criteria shall be agreed upon by the purchaser and the manufacturer. Para 6.3 For UT: See PW-52 RT: Geometric Unsharpness may not exceed .07". Note 7: B31.1 ACCEPTANCE CRITERIA - Where two limiting values are separated by "and", the lesser of the values determines acceptance. Where the two sets of values are separated by "or", the larger of the values is acceptable. Note 4: t - is the thickness of the weld, excluding reinforcement. For butt welds, joining two members of different thicknesses at the weld, (t) is the thinner of the two thicknesses. Note 9: (For B31.1) tm = whichever of the following is applicable: 1) as defined in Para. 104.1.2(A) 2)the min. wall thickness of the component or fitting (or the thinner of the two) when the joint is between two components.
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Transcript of Type of Discontinuity Cheat Sheet
Acceptance Criteria
Sheet1Type of DiscontinuityPRESSURE VESSELS ASME Sect VIII Div
I: (2001 Edition)PROCESS PIPING ASME B31.3 1999 EDITION (See Note
7)PIPELINES API STD 1104: 19th EditionSTORAGE TANKS API STD 650:
Tenth EditionBOILERS ASME SECTION I: 2001EDITIONPOWER PIPING ASME
B31.1 2001 EDITIONFull RadiographySpot RadiographySEVERE CYCLIC
CONDITIONS (100% RADIOGRAPHY)NORMAL FLUID SERVICES (5%
RADIOGRAPHY)CracksNONE ALLOWED UW-51NONE ALLOWED UW-52NONE ALLOWED
Table 341.3.2NONE ALLOWED Table 341.3.2Linear Cracks NOT ALLOWED.
Shallow crater/star cracks < 5/32" long are acceptable.
(9.3.10)NONE ALLOWED (See ASME Section VIII, Div. I: UW-51)NONE
ALLOWED PW-51NONE ALLOWED 136.4.5Incomplete Penetration: Root Pass
(IP)NONE ALLOWED UW-51NONE ALLOWED UW-52NONE ALLOWED Table
341.3.2Maximum of 1/32" and 20% of wall thickness. Maximum length
of 1.5" in 6" of weld. NONE ALLOWED IN LONGITUDINAL WELDS. Table
341.3.2Maximum of 1" length for individual indication; Combined
total of indications maximum of 1" length in any continuous 12" of
weld, or 8% of the weld length if less than 12" (9.3.1)NONE ALLOWED
(5.3.2.1)NONE ALLOWED PW-51NONE ALLOWED 136.4.5Incomplete
Penetration: Due to High/Lo Fit-up or Cross Penetration (IPD) or
(ICP)NONE ALLOWED UW-51NONE ALLOWED UW-52NONE ALLOWED Table
341.3.2Maximum of 1/32" and 20% of wall thickness. Maximum length
of 1.5" in 6" of weld. NONE ALLOWED IN LONGITUDINAL WELDS. Table
341.3.2IPD-Maximum individual length of 2". Maximum aggregate
length of 3" in 12" of continuous weld. ICP-Max individual length
2". Max aggregate length of 2" in any 12" of continuous weld.
(9.3.2) and (9.3.3)NONE ALLOWED (5.3.2.1)NONE ALLOWED PW-51NONE
ALLOWED 136.4.5Incomplete Fusion: Root Pass or Surface (IF)NONE
ALLOWED UW-51NONE ALLOWED UW-52NONE ALLOWED Table 341.3.2NONE
ALLOWED Table 341.3.2Maximum of 1" length for individual
indication; Combined total of indications maximum of 1" length in
any continuous 12" of weld, or 8% of the weld length if less than
12". (9.3.4)NONE ALLOWED (5.3.2.1)NONE ALLOWED PW-51NONE ALLOWED
136.4.5Incomplete Fusion: Sidewall or Between Beads (Cold-Lap)
(IFD)NONE ALLOWED UW-51NONE ALLOWED UW-52NONE ALLOWED Table
341.3.2NONE ALLOWED Table 341.3.2Maximum of 2" length for
individual indication; Combined total of indications maximum of 2"
in length in any continuous 12" of weld, or 8% of the weld length
if less than 12". (9.3.5)NONE ALLOWED (5.3.2.1)NONE ALLOWED
PW-51NONE ALLOWED 136.4.5Burn-Through: (BT)Not Specifically Covered
(See Elongated or Round Indications Below) UW-51Not Specifically
Covered (See Elongated or Round Indications Below) UW-52Not
Specifically Covered (See Elongated or Round Indications Below)
Table 341.3.2Not Specifically Covered (See Elongated or Round
Indications Below) Table 341.3.2Maximum dimension shall not exceed
1/4" or the thinnest of the pipe wall thicknesses being joined. The
sum of the maximum dimensions of separate burn-throughs shall not
exceed 1/2" in any continuous 12" of weld, or the total weld
length, whichever is less. The density of any portion or it's image
shall not exceed that of the thinnest adjacent base metal.
(9.3.7)NOT SPECIFICALLY COVERED (See Elongated or Rounded
Indications Below)NOT SPECIFICALLY COVERED (See Elongated or
Rounded Indications Below)(Same as ASME Section I) 136.4.5Internal
Concavity (IC)VT Smoothly contoured concavity permitted if equal
weld reinforcement is provided UW-35.d RT (see Elongated or Rounded
Indications Below) UW-51VT Smoothly contoured concavity permitted
if equal weld reinforcement is provided UW-35.d RT (see Elongated
or Rounded Indications Below) UW-51Internal concavity shall not
reduce the total thickness of the joint, including allowable
reinforcement, to less than the thickness of the thinner of the
components being joined. Table 341.3.2Internal concavity shall not
reduce the total thickness of the joint, including allowable
reinforcement, to less than the thickness of the thinner of the
components being joined. Table 341.3.2For an area exceeding the
density of the thinnest base metal, see the criteria for
Burn-Through. (9.3.6)(See ASME Section VIII, Div. I: UW-51)Smoothly
contoured concavity permitted if equal weld reinforcement is
provided. PW-35.1Root concavity not allowed when there is an abrupt
density change.Undercut: Root or Cap Pass (UC)VT (UW-35) The weld
must be free of ripples, groves, over laps, abrupt ridges or
valleys. Reduction in the thickness from welding shall not exceed
1/32" or 10%t RT (UW-51) (See Elongated or Rounded Indications
Below)VT (UW-35) The weld must be free of ripples, groves, over
laps, abrupt ridges or valleys. Reduction in the thickness from
welding shall not exceed 1/32" or 10%t RT (UW-52) (See Elongated
Indications Below)NONE ALLOWED Table 341.3.2VT ONLY: Maximum depth
of 1/32" and 25% of wall thickness. NONE ALLOWED IN LONGITUDINAL
WELDS. Table 341.3.2Total length of internal and external undercut
shall not exceed 2" in 12" of weld. The total accumulative shall
not exceed 1/6" of the weld length. (9.3.11)VT Vertical Butt
Joints: 1/64" Maximum. Horizontal Butt Joints: 1/32" Maximum.
Attachment Welds: 1/64" Maximum RT (See ASME Section VIII, Div. 1:
UW-51)VT (PW-35) The weld must be free of ripples, grooves,
overlaps, abrupt ridges or valleys. Reduction in the thickness from
welding shall not exceed 1/32" or 10% t. RT (See Elongated or
Rounded Indications Below)(Same as ASME Section I) 136.4.5General
Elongated Indications and/or Slag Inclusions: (SI) Elongated Slag
Inclusions (ESI) Isolated Slag Inclusions (ISI)Nominal
ThicknessMax. LengthMaximum length of 2/3 t, with 3/4" max. Maximum
total length is t in a length of 6 t with 3/4" maximum. If the
indications are aligned, the sum of the longest dimensions of all
indications shall not exceed t in a length of 6 t and the longest
indications are separated by at least 3 L. Any individual
indication less than 1/4" is acceptable. UW-52 (See note 4) (See
note 6)Maximum individual length: 1/3 Tw Max. width:< 1/3 Tw and
3/32" Max. cumulative length: < Tw in any 12 Tw of weld length.
Table 341.3.2 (See Note 1)Maximum individual length: 2 Tw Max.
width:< 1/2 Tw and 1/8" Max. cumulative length: < 4 Tw in any
6" of weld length. Table 341.3.2 (See note 1)Max. Width of ESI is
1/16". Max. combined length is ISI indications shall not exceed 8%
of weld length. FOR PIPE OD < 2.375" Length of ESI indications
shall not exceed 3 Tw. Combined length of ISI indication shall not
exceed 2 Tw and the width not to exceed 1/2 Tw. FOR PIPE OD >
2.375" Length of ESI indication shall not exceed 2" in any
continuous 12" of weld. Combined length of ISI indication shall not
exceed 1/2" in any continuous 12" weld. Max. width of ISI is 1/8".
Max. of 4 ISI indications with 1/8" width in any 12" of weld
(9.3.8)(See ASME Section VIII, Div. 1: UW-51)Nominal ThicknessMax.
Slag Length(Same as ASME Section I) 136.4.5< 3/4"1/4"<
3/4"1/4"3/4" to 2-1/4"1/3t3/4" to
2-1/4"1/3t>2-1/4"3/4">2-1/4"3/4"Aligned indications shall not
exceed t in a length of 12 t, unless the distance between
successive indications exceeds 6L. UW-51 (See note 4) (See note
6)Aligned indications shall not exceed t in a length of 12 t,
unless the distance between successive indications exceeds 6L.
PW-51 (See Note 4) (See Note 6)Porosity or Rounded Indications:
(P), (CP) & (HB)Max. size of any indication shall be the
smaller of 1/4t or 5/32". Isolated indications separated from
adjacent indications by 1" or more, may be the smaller of 1/3 t or
1/4". For thickness' greater than 2" the max. permissible size of
isolated indications is 3/8". Aligned indications shall not exceed
t in a length of 12 t. Clusters shall not exceed the lesser of 1"
or 2 t. If more than one cluster, the sum of lengths shall not
exceed 1" in a 6" length of weld. UW-51 (See Note 3) (See Note
4)Rounded indications are not a factor in the acceptability of
welds not required to be fully radiographed. UW-52(See ASME Section
VIII, Div. 1:App. 4)For thickness < 1/4" see ASME Section VIII
Div 1: UW-51 (Appendix 4). For thickness > 1/4", all dimensions
in Appendix 4 are multiplied by 1.5 (i.e. Max. size of indication
shall be .375 t or .234". Table 341.3.2 (See Note 3) (See Note
4)Spherical: Max. dimension 1/8" or 25% Tw. (9.3.9.2) Cluster: Max
1/2" diameter with max. Individual pore dimension of 1/16". Max.
combined length 1/2" in an 12" of weld. (9.3.9.3) Hollow Bead: Max.
length is 1/2". Combined length of indications shall not exceed 2"
in any continuous 12" of weld. Individual indication greater than
1/4" in length shall be separated by > 2". Max. combined length
of indications < 8% of weld length. (9.3.9.4)(See ASME Section
VIII, Div. 1: UW-51)Max. size of any indication shall be the
smaller of 1/4t or 5/32". Isolated indications separated from
adjacent indications by 1" or more, may be the smaller of 1/3 t or
1/4". For thickness' greater than 2" the max. permissible size of
isolated indications is 3/8". Aligned indications shall not exceed
t in a length of 12 t. Clusters shall not exceed the lesser of 1"
or 2 t. If more than one cluster, the sum of lengths shall not
exceed 1" in a 6" length of weld. UW-51 (See Note 3) (See Note
4)(Same as ASME Section I) 136.4.5Weld Reinforcement (VT
criteria)Nominal ThicknessCat B &C butt weldsOther weldsNominal
ThicknessCat B &C butt weldsOther weldsTwMax. HeightTwMax.
HeightNot CoveredPlate thicknessMax. ReinforcementNom.
ThicknessMaximum Reinforcement, in.The greater of (tm + 0.15") or
1.15tm when ordered on a minimum wall basis. The greater of (tm +
0.15") or 1.10tnom when ordered on a nominal wall basis. 127.4.2
(See Note 9)Less than 3/32" 3/32" to 3/16" incl. Over 3/16" to 1/2"
incl. Over 1/2" to 1" incl. Over 1" to 2" incl. Over 2" to 3" incl.
Over 3" to 4" incl. Over 4" to 5" incl. Over 5"3/32" 1/8" 5/32"
3/16" 1/4" 1/4" 1/4" 1/4" 5/16"1/32" 1/16" 3/32" 3/32" 1/8" 5/32"
7/32" 1/4" 5/16"Less than 3/32" 3/32" to 3/16" incl. Over 3/16" to
1/2" incl. Over 1/2" to 1" incl. Over 1" to 2" incl. Over 2" to 3"
incl. Over 3" to 4" incl. Over 4" to 5" incl. Over 5"3/32" 1/8"
5/32" 3/16" 1/4" 1/4" 1/4" 1/4" 5/16"1/32" 1/16" 3/32" 3/32" 1/8"
5/32" 7/32" 1/4" 5/16"1/2" to 1"3/32"1/2" to 1"5/32">1/2" to
1"5/32">1"1/8"Over 1"3/16"Over 1"3/16"(See Notes 1 & 2)(See
Notes 1 & 2)Note: These parameters are from the RT criteria in
Para. 6.1.3.4. For the general requirements see Para.
5.2.1.5Misalignment (VT Criteria)Nominal ThicknessCircum.
JointLongit. JointNominal ThicknessCircum. JointLongit. JointThe
inside diameter of components at ends to be joined must be aligned
within the engineering design and weld procedure. If the external
surfaces of the two components are not aligned, the weld shall be
tapered between the two surfaces. 328.4.3The inside diameter of
components at ends to be joined must be aligned within the
engineering design and weld procedure. If the external surfaces of
the two components are not aligned, the weld shall be tapered
between the two surfaces. 328.4.3Maximum of 1/8". Greater offset
caused by dimensional variations shall be equally distributed
around the circumference of the pipe. (7.2)Vert. MisalignmentHoriz.
MisalignmentNominal ThicknessCircum. JointLongit. Joint1/16"
127.31/2" to 3/4" >3/4" to 1-1/2" >1-1/2" to 2" Over 2" (Note
8)1/4t 1/4t 3/16" 1/8t Lesser of 1/8t or 3/4"1/4t 1/8 1/8 1/8
Lesser of 1/16t or 3/8"ThicknessMaximumThicknessMaximum5/8"1/16"
Lesser of 10%t or 1/8" 2.375" Length of ESI indication shall no
exceed 2" in any condinuous 12" of weld. Combined length of ISI
indication shall not exceed 1/2" in any continuous 12" weld. Max.
width of ISI is 1/8". Max. of 4 ISI indications with 1/8" width in
any 12" of weld (9.3.8)(See ASME Section VIII, Div. 1:
UW-51)Nominal ThicknessMax. Slag Length(Same as ASME Section I)
136.4.5< 3/4"1/4"< 3/4"1/4"3/4" to 2-1/4"1/3t3/4" to
2-1/4"1/3t>2-1/4"3/4">2-1/4"3/4"Aligned indications shall not
exceed t in a length of 12 t, unless the distance between
successive indications exceeds 6L. UW-51 (See note 4) (See note
6)Aligned indications shall not exceed t in a length of 12 t,
unless the distance between successive indications exceeds 6L.
PW-51 (See Note 4) (See Note 6)Porosity or Rounded Indications:(P),
(CP) & (HB)Max. size of any indication shall be the smaller of
1/4t or 5/32". Isolated indications seperated from adjacent
indications by 1" or more, may be the smaller of 1/3 t or 1/4". For
thickness' greater than 2" the max. permissible size of isolated
indications is 3/8". Aligned indications shall not exceed t in a
length of 12 t. Clusters shall not exceed the lesser of 1" or 2 t.
If more than one cluster, the sum of lengths shall not exceed 1" in
a 6" length of weld. UW-51 (See Note 3) (See Note 4)Rounded
indications are not a factor in the acceptability of welds not
required to be fully radiographed. UW-52(See ASME Section VIII,
Div. 1:App. 4)For thickness < 1/4" see ASME Section VIII Div 1:
UW-51 (Appendix 4). For thickness > 1/4", all dimensions in
Appendix 4 are multiplied by 1.5 (i.e. Max. size of indication
shall be .375 t or .234". Table 341.3.2 (See Note 3) (See Note
4)Spherical: Max. dimension 1/8" or 25% Tw. (9.3.9.2) Cluster: Max
1/2" diameter with maz. Individual pore dimension of 1/16". Max.
combined length 1/2" in an 12" of weld. (9.3.9.3) Hollow Read: Max.
length is 1/2". Combined length of indications shall not exceed 2"
in any continuous 12" of weld. Individual indication greater than
1/4" in length shall be seperated by > 2". Max. combined length
of indications < 8% of weld length. (9.3.9.4)(See ASME Section
VIII, Div. 1: UW-51)Max. size of any indication shall be the
smaller of 1/4t or 5/32". Isolated indications seperated from
adjacent indications by 1" or more, may be the smaller of 1/3 t or
1/4". For thickness' greater than 2" the max. permissible size of
isolated indications is 3/8". Aligned indications shall not exceed
t in a length of 12 t. Clusters shall not exceed the lesser of 1"
or 2 t. If more than one cluster, the sum of lengths shall not
exceed 1" in a 6" length of weld. UW-51 (See Note 3) (See Note
4)(Same as ASME Section I) 136.4.5Weld Reinforcemant (VT
criteria)Nominal ThicknessCat B &C butt weldsOther weldsNominal
ThicknessCat B &C butt weldsOther weldsTwMax. HeightNot
CoveredPlate thicknessMax. ReinforcementLess than 3/32" 3/32" to
3/16" incl. Over 3/16" to 1/2" incl. Over 1/2" to 1" incl. Over 1"
to 2" incl. Over 2" to 3" incl. Over 3" to 4" incl. Over 4" to 5"
incl. Over 5"3/32" 1/8" 5/32" 3/16" 1/4" 1/4" 1/4" 1/4" 5/16"1/32"
1/16" 3/32" 3/32" 1/8" 5/32" 7/32" 1/4" 5/16"Less than 3/32" 3/32"
to 3/16" incl. Over 3/16" to 1/2" incl. Over 1/2" to 1" incl. Over
1" to 2" incl. Over 2" to 3" incl. Over 3" to 4" incl. Over 4" to
5" incl. Over 5"3/32" 1/8" 5/32" 3/16" 1/4" 1/4" 1/4" 1/4"
5/16"1/32" 1/16" 3/32" 3/32" 1/8" 5/32" 7/32" 1/4" 5/16"1/2" to
1"5/32">1/2" to 1"5/32"Over 1"3/16"Over 1"3/16"(See Notes 1
& 2)(See Notes 1 & 2)Misalignment (VT Criteria)Accumulation
of DiscontinuitiesGeneral Notes and Other NDE
Sheet3
