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ASME B31.3-2012

(a) For P-Nos. 3, 4, and 5 materials, examination shallbe performed after completion of any heat treatment.

(b) For a welded branch connection the examinationof and any necessary repairs to the pressure containingweld shall be completed before any reinforcing pad orsaddle is added.

341.3.2 Acceptance Criteria. Acceptance criteriashall be as stated in the engineering design and shall atleast meet the applicable requirements stated below, inpara. 344.6.2 for ultrasonic examination of welds, andelsewhere in the Code.

(a) Table 341.3.2 states acceptance criteria (limits onimperfections) forwelds. See Fig. 341.3.2 for typicalweldimperfections.

(b) Acceptance criteria for castings are specified inpara. 302.3.3.

341.3.3 Defective Components and Workmanship.An examined item with one or more defects (imperfec-tions of a type or magnitude exceeding the acceptancecriteria of this Code) shall be repaired or replaced; andthe newwork shall be reexamined by the samemethods,to the same extent, and by the same acceptance criteriaas required for the original work.

341.3.4 Progressive Sampling for Examination.When required spot or random examination reveals adefect, then

(a) two additional samples of the same kind (ifwelded or bonded joints, by the same welder, bonder,or operator) from the original designated lot shall begiven the same type of examination

(b) if the items examined as required by (a) aboveare acceptable, the defective item shall be repaired orreplaced and reexamined as specified in para. 341.3.3,and all items represented by these two additional sam-ples shall be accepted, but

(c) if any of the items examined as required by (a)above reveals a defect, two further samples of the samekind shall be examined for each defective item foundby that sampling

(d) if all the items examined as required by (c) aboveare acceptable, the defective item(s) shall be repaired orreplaced and reexamined as specified in para. 341.3.3,and all items represented by the additional samplingshall be accepted, but

(e) if any of the items examined as required by (c)above reveals a defect, all items represented by the pro-gressive sampling shall be either

(1) repaired or replaced and reexamined asrequired, or

(2) fully examined and repaired or replaced as nec-essary, and reexamined as necessary to meet the require-ments of this Code

(f ) If any of the defective items are repaired orreplaced, reexamined, and a defect is again detected inthe repaired or replaced item, continued progressive

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sampling in accordance with (a), (c), and (e) is notrequired based on the defects found in the repair. Thedefective item(s) shall be repaired or replaced and reex-amined until acceptance as specified in para. 341.3.3.Spot or random examination (whichever is applicable)is then performed on the remaining unexamined joints.

341.4 Extent of Required Examination

341.4.1 Examination Normal Fluid Service. Pipingin Normal Fluid Service shall be examined to the extentspecified herein or to any greater extent specified in theengineering design. Acceptance criteria are as stated inpara. 341.3.2 and in Table 341.3.2, for Normal FluidService unless otherwise specified.

(a) Visual Examination. At least the following shall beexamined in accordance with para. 344.2:

(1) sufficient materials and components, selected atrandom, to satisfy the examiner that they conform tospecifications and are free from defects.

(2) at least 5% of fabrication. For welds, each weld-ers and welding operators work shall be represented.

(3) 100% of fabrication for longitudinal welds,except those in components made in accordance with alisted specification. See para 341.5.1(a) for examinationof longitudinal welds required to have a joint factor, Ej,of 0.90.

(4) random examination of the assembly ofthreaded, bolted, and other joints to satisfy the examinerthat they conform to the applicable requirements ofpara. 335. When pneumatic testing is to be performed,all threaded, bolted, and other mechanical joints shallbe examined.

(5) random examination during erection of piping,including checking of alignment, supports, and coldspring.

(6) examination of erected piping for evidence ofdefects that would require repair or replacement, andfor other evident deviations from the intent of the design.

(b) Other Examination(1) Not less than 5% of circumferential butt and

miter groove welds shall be examined fully by randomradiography in accordance with para. 344.5 or by ran-dom ultrasonic examination in accordance with para.344.6. The welds to be examined in each designated lotshall include theworkproduct of eachwelder orweldingoperator whose welds are part of the lot. They shall alsobe selected to maximize coverage of intersections withlongitudinal joints. When a circumferential weld withan intersecting longitudinal weld(s) is examined, at leastthe adjacent 38 mm (112 in.) of each intersecting weldshall be examined. In-process examination in accordancewith para. 344.7 may be substituted for all or part ofthe radiographic or ultrasonic examination on a weld-for-weld basis if specified in the engineering design orspecifically authorized by the Inspector.

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