ASME标准渗透工艺规程

1、ASME 标准渗透探伤通用工艺规程POE0702-SPC-ST-02 Specification for Supplying Line Pipe for Submarine PipelinesRev. B Employer : SONILS LDAEngineer : SCOTT WILSON LTD, UKContractor : CHINA HARBOUR ENGINEERING CO., LTD. Subcontractor: PETRO-OFFSHORE ENGINEERINGIssue Status 1GENERAL . 3 2PERSONNEL . 3 3PENETRANT MAT

2、ERIALS . 3 4EXAMINATION PROCEDURE . . 4 4.1E XAMINATION F LOW C HART AS SHOWN IN F IG .4.1. . 4 4.2S URFACE P REPARATION . 4 4.3P RECLEANING . . 5 4.4P ENETRANT A PPLICATION . 5 4.5E XCESS P ENETRANT R EMOVAL . 5 4.6D EVELOPER A PPLICATION . 6 4.7I NTERPRETATION . 64.8P OST -CLEANING . 65EVALUATION

3、OF INDICATIONS . 7 6ACCEPTANCE STANDARDS . . 7 7THE REPAIRED AREA SHALL BE REEXAMINED ACCORDING TO THE ORIGINAL EXAMINATION PROCEDURE. . . 8 8REPORT . 8 9REPORT FORM, SEE PAGE 8 OF 8. . . 8 10. 81 General1.1 This procedure is applied to dye liquid penetrant examination of metal material and weldment

4、 for ASME Code items.1.2 This procedure is only suitable for detecting the defects that are open to the surface of material or weldment.1.3 This procedure shall be demonstrated to the satisfaction of the AI prior to implementation.2 Personnel2.1 The personnel engaged in the penetrant examination sha

5、ll be qualified and certified in accordance with the requirement of NJBST Co., Ltd.s “ Written Practice for NDE Personnel Training Examination, Qualification and Certification”(No.:QCD-011.3 Penetrant Materials3.1 The penetrant materials is intended to include all penetrants, solvents or cleaning ag

6、ents, developers, etc, used in the examination process.3.2 The liquid penetrant examination materials shall be designated and recommended, as shown in Table 3.2. The materials used for examination shall be the same type. Intermixing of penetrant materials from different families or different manufac

7、turers is not permitted.Table 3.2 3.3 When examining austenitic stainless steel or titanium, all materials shall be analyzed individually for chlorine and fluorine content in accordance with the procedure shown in T-641(b of ASME Code Section V. The total chlorine plus fluorine content shall not exc

8、eed 1%of the residue by weight. The certificate of compliance from manufacturer shall be obtained.3.4 When examining nickel base alloys, all materials shall be analyzed individually for sulphur content in accordance with the procedure shown in T-641(a of Section V.The sulphur content shall not excee

9、d 1%of the residue by weight. The certificate of compliance from manufacturer shall be obtained.4 Examination Procedure4.1 Examination Flow Chart as shown in Fig.4.1. Fig. 4.14.2 Surface PreparationPrior to all penetrant examination, the surface to be examined and all adjacent areas within at least

10、1in. (25.4mm shall be dry and free of dirt, grease,lint, scale, weldingflux, weld spatter , paint , oil and other extraneous matter. If necessary, surface shall be prepared by grinding or machining.4.3 Precleaning4.3.1 The areas to be examined and adjacent areas within at least 1in. (25.4mm shall be

11、 cleaned using cleaning agent before the penetrant is applied.4.3.2 After cleaning, drying of the surface to be examined shall be accomplished by normal evaporation or with forced air, as appropriate. The minimum drying time shall ensure that the cleaning solution has evaporated prior to application

12、 of the penetrant. 4.4 Penetrant Application4.4.1 The penetrant may be applied on the surfaceof workpieces to be examined by any suitable means such as dipping, brushing or spraying.4.4.2 The temperature of the penetrant and the surface to be examined shall not be below 500F (100C nor above 1250F(52

13、0C throughout the examination period. When it is not practical to conduct a liquid penetrant examination within above temperature range, the examination procedure at the proposed lower or higher temperature range shall be qualified using a quench cracked aluminum block according to ASME Code Section

14、 V, T-653.4.4.3 Penetration time is critical. The minimum dwell time is shown in Table 4.4.3. For suitable temperature, the area being examined shall remain wetted by the penetrant for the dwell time.Table 4.4.3 Recommended minimum dwell times 4.5 Excess Penetrant RemovalExcess solvent removable pen

15、etrant shall be removed by wiping with a cloth or absorbent paper. The remaining traces shall be removed by lightly wiping the surface with a cloth or absorbent paper moistened with solvent. To avoid over removing, flushing the surface with solvent shall be prohibited. 4.6 Developer Application 4.6.

16、1 The developer shall be applied as soon as possible after excess penetrant removal and drying surface. The surface may be dried by normal evaporation before the developer is applied. The drying time shall be within 5 to 20 min. 4.6.2 The developer shall be applied by spraying. A uniform thin coatin

17、g shall be provided and the coating thickness shall be suitable. 4.6.3 Prior to applying wet developer to the surface, the developer must be thoroughly agitated. 4.6.4 Dipping or flooding the part with non-aqueous developer is prohibited, since it will dissolve the penetrant in the discontinuities t

18、hrough its solvent action. 4.7 Interpretation 4.7.1 Developing time for final interpretation begins as soon as a wet developer coating is dry. The minimum developing time shall be 7min. 4.7.2 Final interpretation shall be made within 7 to 60 min after the requirements of Para. 4.7.1 are satisfied. 4

19、.7.3 The developing trace can be examined either by natural light or artificial light. A minumum light intensity of 50 fc (500Lx is required to ensure adequate sensitivity during the examination and evaluation of indications. 4.7.4 The surface shall be divided into several parts to be examined if th

20、e surface is so large that the examination can not be finished within the given time. The developing condition can be observed either by eyes or by means of a magnifier. 4.8 Post-cleaning The penetrant materials shall be clearly removed away from parts after examination. The post cleaning must be pe

21、rformed if remaining penetrant materials can result in corrosion by the combination with other materials during the operation. The suitable cleaning process shall be adopted for post cleaning such as flushing with water, mechanical cleaning, solvent soaking, etc. The developer shall be cleaned as so

22、on as possible after examination if the part requests the post cleaning so as to avoid it condensed on the part. 5 Evaluation of Indications 5.1 Broad areas of pigmentation which could mask indications of discontinuities are unacceptable and such areas shall be cleaned and reexamined. 5.2 An indicat

23、ion is the evidence of a mechanical imperfection. Only indications with major dimensions greater than 1/16in (1.6mm shall be considered relevant. 5.3 Linear indications are those indications in which the length is more than three times the width . Rounded indications are indications which are circul

24、ar or ellipsoidal with the length less than three times the width. 5.4 Any questionable or doubtful indications shall be reexamined to determine whether or not they are relevant. Surface conditioning may proceed before the reexamination. 5.5 The indication of a discontinuity may be larger than the discontinuity that causes it; however, the