All welded joints subject to radiography shall be examined in accordance with
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Article 2 of ASME Section V. 4.1 . NDE Personnel:
RT Examination Personnel shalt be qualified and certified in accordance with Employer's written practice, as per SNT-TC-1A.
4.2 Evaluation of Radioqraphs:, 100% Radioqraphy-:
, The requirements of ASME Section V Article 2 Clause T-280 are used as 2
guide Final acceptance of radiographs shall be based on the ability to see the prescribed penetrameter image and the prescribed hole. or the designated wire of a wire penetrameter.
Indications shown on tile radiographs of welds and characterized as impe.fections are unacceptable under tile following conditions or acceptance
CrItena and the repairs are re-radiographed and evaluated to the same
acceptance criteria.
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\ 4.3 ---.- -- - --- - ··_h __Any" indicClticn charac~~f!::::'::';~as a crack or zone {if incomplete' fllSi,)n ur' penetration; Any other elongated i~dication on the radiograph which "has I~ngth greater than: 1/4 inch for t upto 3/4 inch;
1/3 t for t from 3/4 in. to 2 1/4 in; 3/4 in. for t over 2 1/4 in;
where t
=
the thickness of the weld excluding any allowable reinforcement. For a butt weld joining two members having different thicknesses at the weld,or
is the thinner of these two thicknesses. If a full penetration weld includes a fillet weld, the thickness of the throat of the fillet shall be included in t.Any group of aligned indications that have an aggregate length greater than 't' in a length of 12t, except when the distance between the successive imperfections exceeds 6L, where L is the length of the longest imperfection in the group;
Rounded indications in excess of that specified by the acceptance standards given in Appendix 4 of ASME Code Sec.vlll Div 1.
Evaluation of Spot Radiowaphy: UW-52 of ASME VIII _ 1.
Spot Examination of welds by radiography shall be made in accordance with Article 2 of ASME Section V. Minimum length of spot radiograph shall be 6 inches (150mml.
p;-cceptance Criteria: : For Spot Radioqraphy
I. Welds in which, indications are characterized as cracks or zones of
incomplete fusion or penetration shall be unacceptable.
II. Welds in which indications are characterized as slag inclusions or cavities
shall be unacceptable if the length of ani such indication is greater than 2/3t where 't' is the thickness of the weld excluding any allowable reinforcement.
For a butt weld joining two members having different thicknesses at the weld, 't' is the thinner of the two thicknesses. If a full penetration weld includes 3 fillet weld, the thickness of the throat of the fillet shall be
included in .t'
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shall j"'e judged acceptabieif the sum of the longest dimens~ons of a:/ such indications is not more than '1' in a lengtt of '61' [or Proportionately for r9diographs shorter than '61'], ana if the longest indications considered are separated by atleast 3L, of acceptable weld metal where L is the length of the longest indication. '
"The maximum length of acceptable indications shall be 3/4 in. Any indication shorter than 1/4 in. shall be acceptable for any plate thickness.
IV. Rounded indications are not a factor in the acceptability of welds not
required to be fully radiographed.
Evaluation and Retests in the case of Spot RadioQfaphy:
When a spot radiograph is acceptable in accordance with the above criteria, the entire weld line represented by this spot radiograph is acceptable.
When a spot radiograph discloses an indication unacceptable to above criteria,
then 1'1.'0 additional spots shall be marked by the Inspector, in the weld line
represented by the original sp~t radiograph, but away from the spot. If both the spots, meet acceptance criteria, and then the defect disclosed in the original spot is repaired and radiographed to acceptable criteria, then the entire weld line is considered acceptable. However, if either of the two additional spots"- does not comply with the acceptance criteria, the entire represented weld line shall be" rejected; and either removed or repair-welded and fully radiographed to acceptance criteria.
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8.
CODE STAMPING AND REPORTS
GE~.NERAL : The -marking and certification of all pressure vessels built under this Division shalf comply with the requirements of the following paragraphs,
The units used in Manufacturer's Data Reports, Manufacturer's Certificates of Compliance (UG-120), and in or stamping pressure vessels shall be either: (1) U.S. Customary units (ft-Ib) exclusively; or
(2) Both U.S. Customary units and metric, in which case the U.S. Customary units shall be the standard, and the metric units shall be shown parenthetically.
Required Marking:
(a) Each pressure vessel shall be marked with the following:
(1) (a) the official Code U Symbol shown in Fig. UG-116 sketch (a) on vessels inspected in accordance with the requirements in UG-90 through UG-97 (when inspected by a user's Inspector as provided in UG-91, the word USER shall be marked above the Code Symbol); or
(b) ,the official UM Symbol shown in Fig. UG-116 sketch (b) on vessels constructed in accordance with the provision in U-1 0).
(2) name of the Manufacturer preceded by the words "certified by"; (3) maximum allowable working pressure --- psi at OF.
(4) '. 'I • , I 0' ,37
minimum deSign mela temperature --- F ---~h---pSI (5) Manufacturer's serial number;
('6) Year built.
(b) (1) The type of construction used for the vessel shall be indicated directly under the Code Symbol by applying the appropriate letter(s) as follows: vessesls having Category A, 8, or C joints (except nozzles or for example, Arc welded ~W. (c) When a vessel is intended for special service and the special requirements [ UG-
120 (d)], the appropriate lettering shall be applied as i;.;:ed below: Lethal Service L
Unfired Steam Boiler UB Direct Firing DF.
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(rl) When a vessel has been radiographed in accordance with UW-11, rrla;king shalt be applied undp.r-the Code Symbol as follows:
, (1) '''RT 1."-Vessel fully radiographed
(2) "RT 2" when the complete vessel satisfies the requirements of UW-11 (a)(5) and when the spot radiography requirements of UW-11 (a)(5)(b) have been applied; or
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(3) "RT 3" when the vessel satisfies the spot radiography requirements of UW-11 (b); or .(4) "RT 4" when only part of the 'complete vessel has satisfied the radiographic
requirements of UW-11 (a) or where none of the markings "RT 1", "RT 2", or "RT 3"
are applicable.
(e) (1 )The letters HI shall be applied under the Code Symbol when the complete
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vessel has been postweld heat treated as provided in UW-1 O.
(2)The letter PHT shall be applied under the Code Symbol when only part of the complete vessel has been postweld heat treated as provided in UW-1 O.
(f)( 1) Except as provided in below, the Code Symbol shall be applied after the hydrostatic test or pneumatic test.
(2) The Code Symbol may be preapplied to a nameplate. The nameplate may be attached to the vessel after the final fabrication and examination sequence but before the hydrostatic tests or pneumatic test provided the procedure for sequence of stamping is described in the Manufacturer's accepted Quality Control System. ,.-
(h) Parts of vessels for which Partial Data Reports are required in UG-120 (c) shall.~e
'I marked by the parts Manufacturer with the following:
(1) the official Code Symbol shown in Fig. UG-116 sketch (a), above the word "PART"; (2) name of the Manufacturer of the part of the pressure vessel preceded by the words
"certified by";
(3) the Manufacturer's serial number.
Thisrequirement does not apply to such items as handhole covers, mandllole covers and their accessories.
(g) F~emovable pressure parts shall be permanently marked in a manner to identify them with the vessel or cllamber of which they form a part. This does not apply to n12nllo!e covers, handllole covers, and tlleir accessory paris