装配检查规程(英)qep.doc

WPEC
DOC. NO. QCEP-04
REV. NO.：0
Page 5 of 5

FITTING EXAMINATION PROCEDURE

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REV. NO.
PREPARED BY
REVIEWED BY
APPROVED BY
ACCEPTED BY

FITTING EXAMINATION PROCEDURE

1. General

1.1 This procedure is applicable to the pressure vessels which are fabricated in accordance with ASME Code Section Ⅷ Division 1.矚慫润厲钐瘗睞枥庑赖。

1.2 The examiner shall be experienced. The natural or corrected acuity of examiner shall be capable of performing operation specified by this procedure.聞創沟燴鐺險爱氇谴净。

1.3 The direct visual examination is employed by this procedure.残骛楼諍锩瀨濟溆塹籟。

1.4 On the examination field the illuminator shall be sufficient that the examination can be performed well.酽锕极額閉镇桧猪訣锥。

1.5 The measurement and equipment used for examination shall be calibrated and be used in the effective period.彈贸摄尔霁毙攬砖卤庑。

1.6 An examiner shall examine the material marking to make sure that the intended material is used.謀荞抟箧飆鐸怼类蒋薔。

2. Examination Requirement

2.1 Alignment of section at edges to be butt welded shall be such that the maximum offset is not greater than the applicable amount for the welded joint category under consideration, as separately listed in following tables per materials used. The section thickness t is the nominal thickness of the thinner section at the joint. 厦礴恳蹒骈時盡继價骚。
Table 1 is applied for the pressure vessel constructed of carbon or low alloy steel, except ferrite steels with tensile properties enhanced by heat treatment. Table 2 is for the pressure vessel constructed of ferritic steels with tensile properties enhanced by heat treatment.茕桢广鳓鯡选块网羈泪。
TABLE 1

TABLE 2

2.2 Any offset within the allowable tolerance specified in the table 1 above shall be faired at a three to one taper over the width of the finished weld, or if necessary, by adding additional weld metal beyond what would otherwise be the edge of the weld. Such additional weld metal shall be subject to the following requirements.鹅娅尽損鹌惨歷茏鴛賴。

2.2.1 Using a Qualified WPS.
2.2.2 All weld metal buildup must be examined over the full surface of the deposit by PT or MT examination to the requirements of Appendix of ASME Code Section Ⅷ,Division 1.籟丛妈羥为贍偾蛏练淨。

2.3 Where lap welds are used the lapped plates shall fit closely. The lapped width shall conform to the requirements of the drawings.預頌圣鉉儐歲龈讶骅籴。

2.4 For vessels made up of two or more courses, except when the longitudinal joints are radiographed 4in. each side of each circumferential welded intersection, the centers of the welded longitudinal joints of adjacent courses shall be staggered or separated by a distance of at least 5 times the thickness of the thicker plate.渗釤呛俨匀谔鱉调硯錦。

2.5 The orientations of nozzles and attachments shall be checked in accordance with the requirements of the drawings.铙誅卧泻噦圣骋贶頂廡。

3. Examination Method

3.1 The amount of offset at any point of butt-welded joints shall be examined with weld gage.擁締凤袜备訊顎轮烂蔷。

3.2 The taper faired at finished weld shall be measured with a steel ruler.贓熱俣阃歲匱阊邺镓騷。

3.3 Before welding the lap joint, the examiner shall measure the lap width which is determined by the requirements of the drawings with a steel ruler (the worker shall make the lapping mark previously). After alignment, the examiner shall measure the lap heights between two lapped plates with a plug gauge before welding, and shall re-check the lapped width against the lapped mark by visual examination.坛摶乡囂忏蒌鍥铃氈淚。

3.4 The circumferential distance of the centers of the welded longitudinal joints of adjacent sections is measured by means of steel tape.蜡變黲癟報伥铉锚鈰赘。

3.5 The zero degree point of the vessel shall be determined and be set at the highest position. The examiner shall check the circumferential orientations of nozzles at the vessel with an angle finder. The circumferential orientation of other aligned attachments shall be checked against the arc length.買鲷鴯譖昙膚遙闫撷凄。

3.6 The longitudinal distances of nozzles and other aligned attachments may be measured with a steel tape.綾镝鯛駕櫬鹕踪韦辚糴。

3.7 The heights of nozzles, the parallelism or perpendicularity between the faces of flanges and the axis of revolution for shell shall be measured with a steel tape and a right square.驅踬髏彦浃绥譎饴憂锦。

4. Examination Record
The results of examination shall be recorded on the list of "Check Record of Fitting Parts Location" (Form QCEP-04-1).猫虿驢绘燈鮒诛髅貺庑。