REDUCTION OF THE RESIDUAL AMOUNT OF NOXIOUS LIQUID SUBSTANCES IN THE PIPING SYSTEM OF CHEMICAL TANKERS AFTER UNLOADING PROCEDURE OF CARGO : PART 3:REDUCING EFFECT OF RESIDUE IN THE DISCHARGING OPERATION WITH THE LINE BLOWING-ANALYSIS

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概要

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• The method to strip residues by the gas flow from the piping system in the chemical tankers, which it is usually refer to as the line blowing, is described. The line blowing was performed with the large scale laboratory experimental apparatuses which are specified in Annex n of MARPOL 73/78 and the Standards of Procedures and Arrangements. Water and air were used as the test fluid. Gas flow was generated by compressed gas supplied to the piping when the manifold valve installed at the exit end of the horizontal pipe is opened quickly. To evaluate the performance of the line blowing, a simple analytical model for predicting the quantity of the remaining water in the horizontal and vertical pipe during the process of the line blowing was developed, based on the arrangement of the experimental apparatus and the operating procedures as well as the results of flow observations. The line blowing process was modeled according to the location of the front of the flowing single air slug along the pipeline for the piping arrangement provided to maintain the back pressure with the 10 m. long vertical riser pipe (10mp) and the constant pressure valve (CPV) set the tripping point at 1 kgf/cm^2 at the exit end of the horizontal pipe. The results predicted by the analysis for two experimental apparatuses were compared with wide range of the experimental data for 4-in. and 6-in. diameter pipelines. Good agreement with the experimental data of the remaining water rate in the horizontal and vertical pipe is shown. Predictions of the remaining water rate in the horizontal pipe for two experimental appratuses are in satisfactory agreement. The experimental and analytical results suggest the excellency of the line blowing method.

• 独立行政法人 海上技術安全研究所の論文
• 1992-07-30

著者

• Yamane Kenji

  National Maritime Research Institute

• Izuo Aya

  National Maritime Research Institute

• Aya Izuo

  Osaka Branch National Maritime Research Institute

• YAMANE KENJI

  Osaka Branch, National Maritime Research Institute

• YAMAGUCH Katsuji

  Ship Equipment and Marine Environment Division

• NAMIE Sadahiro

  Power and Energy Engineering Division

• Yamaguchi K

  Ship Equipment And Marine Environment Division

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• REDUCTION OF THE RESIDUAL AMOUNT OF NOXIOUS LIQUID SUBSTANCES IN THE PIPING SYSTEM OF CHEMICAL TANKERS AFTER UNLOADING PROCEDURE OF CARGO : PART 3:REDUCING EFFECT OF RESIDUE IN THE DISCHARGING OPERATION WITH THE LINE BLOWING-ANALYSIS
• REDUCTION OF THE RESIDUAL AMOUNT OF NOXIOUS LIQUID SUBSTANCES IN THE PIPING SYSTEM OF CHEMICAL TANKERS AFTER UNLOADING PROCEDURE OF CARGO : PART 2 : REDUCING EFFECT OF RESIDUE IN THE DISCHARGING OPERATION WITH THE LINE BLOWING-EXPERIMENT

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