API 570 핵심 요약 1-6

해외 검사원 자격시험 자료 공유합니다

 

먼저 영어 공부를 선행하시고 시험 준비하기를 권장드립니다 본인은 일전에 드릴쉽승선해서 검사한 경험있는데 영어가들리지 않아 곤란한경험이 여러번있었습니다

일단 해외자격시험은 국내 자격보다 어렵지 않습니다 다만 영어로 시험이 진행된다는 점이 어려울뿐입니다

 

API 시험을 치고나서 느낌은?

시험코드는 반듯이 정독해보시고 시험 치세요 대분분의 문제가 해당코드에서 출제 됩니다 그리고 공부방법은 기출문제를 풀어보고 그문제가 어디에서 나오는지 알아야 한다는 것입니다 그것은 추가코드를 공부할때도 마찬가지 입니다 문제를 풀때 앞의 목차를 보면서 어디에서 나올것 같은지 한번씩 생각해 보시기를 추천 드립니다    

 

아직 공유안한 자료들 많이 있습니다 혹시 필요하신분들 댓글 달아주세요 (510,570, 653, ASNT L3, CWI 등...기타 각종 코드 필요하신분들 )

 

 

국내 최저가 화상영어 추천(한달 5만원 20회  20분)

국내 최저가 화상영어 (한달 5만원 20회 20분)

 

 

 

 

1. API 570 Code is applicable for inspection, repairs, alteration and re-rating of in-service , metallic piping.

 

 

2. ASME B 31.3 piping is used for construction of new piping installation.

 

 

3. Revised edition and addenda of API and ASME Codes may be used from beginning with date of issue. But they become mandatory from 6 months after issue date.

 

 

4. Table A-1B of B 31.3 Code gives weld joint quality factor for manufactured pipes. The factor can be increased for Electric Fusion welded pipes by conducting additional radiography (spot or full) as per Table 302.3.4.

 

 

5. Minimum required thickness (tm) for a pipe of outside diameter (D), made from material having safe stress (S) and subjected to internal pressure (P) is given by:

 

API 570 핵심 요약

where E = weld joint factor

           Y = material co-efficient (Table 304.1.1)

    C = corrosion and other allowances

 

 

6. Maximum allowable internal pressure for a pipe for given metal thickness is worked out by substituting nett thickness in Barlow formula and calculating the required internal Pressure (P).

(Nett thickness = Available Thickness – Corrosion Allowance)

 

 

7. Thickness of a permanent blank for the pipe is given by:

 

API 570 핵심 요약

 

           Where,  dg = the inside diameter of gasket

 

8. Hydrostatic Test pr = 1.5 X Design pr x stress ratio

 

Stress ratio is ratio of material stress at test temp to the stress at design temp. Stress ratio is always greater than or equal to 1.

 

 

9. Pneumatic test pr  = 1.1 x Design pr

 

During pneumatic test a pressure relief valve (with set pr ≤ 1.1 x Test pr.) shall be installed. Pressurization should be in steps. Initially, pressure shall be slowly increased to 25 psi or 50% of test pressure (whichever is lower). Check for leakage, if any,  and correct them. 

 

Thereafter, the pressure shall be increased in steps up to the full pressure. Inspection shall be carried out at Design Pressure.

 

 

10. Hydrostatic test is preferred over Pneumatic test. The butt joints where Hydro or Pneumatic test can not be performed, 100% RT or UT may be done on butt welds, and PT or MT may be done on other welds (branch welds, fillet welds, etc.) as alternative to Leak testing.

 

 

11. If temperature – thickness combination falls on or above the material curve (Fig. 323.22), impact testing is NOT required. (If below the curve – impact testing is required)

 

 

12. For impact testing 3 specimen are required. If the average of 3 specimen > = Required Average and Value of only one specimen is less than average but more than minimum for one specimen — Accept 

 

 

13. If average of 3 specimen > = Minimum for one specimen and 

    a. Value of one specimen is less than average and also less than minimum for one specimen — Retest

    b. Value of two specimen is less than average — Retest

 

After retest, all specimen must have value > = Average Value

 

 

14. Table 330.1.1 gives required and recommended pre-heat temperature. Recommendation becomes requirement if ambient temp is < 0 º C.

 

 

15. In dissimilar pipe joints higher temperature of the two is to be used for pre-heating. 

 

 

16. PWHT Table (331.1.1) gives temperature range, minimum time and maximum hardness values. Hardness survey shall be done for 10% samples for furnace PWHT, and 100% for local PWHT.