Journal of the Korean Society of Industry Convergence (한국산업융합학회 논문집)

The Korean Society of Industry Convergence (한국산업융합학회)
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A Study on a Quality Characteristics of Pressure Leak Test of Process Piping for Offshore Plant

해양플랜트 프로세스 배관 Pressure Leak Test의 품질 특성에 관한 연구

  • Park, Chang-Soo (Offshore Industries R&BD Center, Korea Research Institute of Ship & Ocean Engineering) ;
  • Kim, Hyungwoo (Offshore Industries R&BD Center, Korea Research Institute of Ship & Ocean Engineering)
  • 박창수 (선박해양플랜트연구소, 해양플랜트산업지원센터) ;
  • 김형우 (선박해양플랜트연구소, 해양플랜트산업지원센터)
  • Received : 2018.10.01
  • Accepted : 2018.12.03
  • Published : 2018.12.31
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Abstract

The process gas piping of the offshore plant can cause a massive explosion if the gas leakage occurs during operation. For the purpose of precaution of gas leakage accident, an air pressure test is performed on the process equipment tests using a test pump as much as the power to the piping inner side, mix 99% nitrogen gas and 1% helium gas. The purpose of the air pressure test is to check the work conformity process by handling and regulation for initial piping process, assembly, installation of module, welding, center alignment of the pipes assembling flange gasket in an unrestrained free state. In this paper, the regulation of the problematic air pressure test was analyzed and the solution criteria were established. And leakage tests of existing equipment were performed applying these solution methods. As a result, it was confirmed that there was no problem.

Keywords

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Fig. 1 PLT general arrangement of test equipment

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Fig. 2 PLT helium leak detector

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Fig. 3 The Processing and inspection of PLT

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Fig. 4 PLT failed re-work FPSO/1ship

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Fig. 5 Factorial analysis of PLT failed re-work

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Fig. 6 Alignment and tolerance of free condition [4]

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Fig. 7 Flange surface damage assessment: scratches and gouges [5]

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Fig. 8 Flange surface damage assessment: pits and dents [5]

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Fig. 9 Shape of Spiral Wounder Gasket

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Fig. 10 Repair work of inner mounted flange facing machine

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Fig. 11 The spiral serrated of Flange surface face for Standard Finishes [8]

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Fig. 12 Temperature and Pressure Circular Chart Recorders for PLT

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Fig. 13 Temperature Pressure and Time of PLT

Table 1. The PLT Ordering organization with Carrying out

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Table 2. The comparison of FLNG and hazard zone for allowable leakage 35 scf/yr and 50scf/yr

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Table 3. The tools and instrument list of PLT

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References

  1. Process Piping(ASME Code for Pressure Piping, B31), ASME B31.3, Chap. IV, The American Society of Mechanical Engineers, USA, pp.83-84, (2008).
  2. Commissioning Procedure-High Pressure Leak Test, PETRONAS Floating LNG Project, PETRONAS, pp.1-9, (2014).
  3. Leak Test Procedure, AGBAMI FPSO PROJECT, DSME, pp.1-16, (2008).
  4. Brent Keil, Robert Card, Jam,es Payne and David Lay : Flange Joints: Avoiding Installation Pitfalls, Proceedings of the Pipelines 2014 Conference, Portland, pp.1638-1641, (2014).
  5. Randy Wacker : Manage & Understand Flange Face Damage, Sealing Sense, Pumps and Systems, USA, pp.51-54, (2013).
  6. Metallic Gaskets for Pipe Flanges(Ring-Joint, Spiral-Wound, and Jacketed), ASME B16.20, The American Society of Mechanical Engineers, USA, (2008).
  7. Technical Data-Surface Roughness, JIS B 0601, Japanese Industrial Standards, Japan, pp.3541-3542, (1994).
  8. Pipe Flanges and Flanged Fittings(Ansi Flanges), ASME B16.5, An American National Standard, USA, pp.46, (2017).