Quantity Calculations LPG and Chemical Gases 2nd Edition (eBook)

Published Date

September 1997


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Quantity Calculations LPG and Chemical Gases 2nd Edition (eBook)

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It is essential to understand the differences in the various calculation procedures practiced if discrepancies between cargo calculated as loaded and cargo calculated as discharged are to be correctly recognised as either real or spurious. This new edition, which is completely revised, continues to assist the Chief Officer with this complex problem.

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It is essential to understand the differences in the various calculation procedures practiced if discrepancies between cargo calculated as loaded and cargo calculated as discharged are to be correctly recognised as either real or spurious. This new edition, which is completely revised, continues to assist the Chief Officer with this complex problem.

PREFACE

1. INTRODUCTION

2. VAPOUR/LIQUID EQUILIBRIUM

3. TERMS AND DEFINITIONS

3.1 GENERAL-DENSITY IN AIR AND DENSITY IN VACUO

3.2 TRUE DENSITY – APPARENT DENSITY

3.3 RELATIVE DENSITY (SPECIFIC GRAVITY)

3.4 APPARENT RELATIVE DENSITY (APPARENT SPECIFIC GRAVITY)

4. VAPOUR DENSITY

4.1 GENERAL

4.2 PERFECT GASES

4.3 REAL GASSES

5. LIQUID DENSITY

5.1 INTRODUCTION

5.2 PRACTICAL DENSITY METHOD: THE PRESSURE HYDROMETER (ASTM D1657)

5.3 DENSITY FROM COMPOSITIONAL ANALYSIS

5.3.1 ASTM D2598

5.3.2 THE FRANCIS FORMULA

5.3.3 THE COSTALD EQUATION

5.3.4 SPECIFIC DENSITY CALCULATION METHODS AND TABLES

5.4 LNG

6. VOLUME AND TOTAL QUANTITY DETERMINATION

6.1 TANK INVENTORY

6.2 THE LIQUID QUANTITY

6.3 SUMMARY

6.3.1 FROM LIQUID DENSITY AT OBSERVED TEMPERATURE

6.3.2 FROM LIQUID DENSITY AT REFERENCE TEMPERATURE

7. SHORE TERMINAL CONSIDERATIONS

7.1 COMPARISON BETWEEN SHIP AND SHORE FIGURES

7.2 FLOWMETERING

8. FUTURE DEVELOPMENT

9. CONCLUSION

APPENDIX 1 PROPERTIES OF COMMERCIAL GASES

APPENDIX 2 WEIGHT IN AIR CONVERSION

APPENDIX 3 THE FRANCIS FORMULA

APPENDIX 4 THE COSTALD EQUATION

APPENDIX 5 QUANTITY CALCULATION OF LPG – AN EXAMPLE

APPENDIX 6 MEASUREMENT REPORT FOR LIQUEFIED GASES

The purpose of SIGTTO is to promote shipping and terminal operations for liquefied gases which are safe, environmentally responsible and reliable. To fulfil this mission it will:

  • Proactively develop best operating practices and guideline

  • Sustain a learning environment by sharing lessons learned

  • Promote training and development of all within the industry

  • Foster mutually beneficial relationships with regulatory authorities and other stakeholders

  • Conduct its business with professionalism and integrity

Title: Quantity Calculations LPG and Chemical Gases 2nd Edition (eBook)
Number of Pages: 31
Product Code: WS1087EA
ISBN: ISBN 13: 978-1-85609-144-2 (9781856091442), ISBN 10: 1-85609-144-9 (1856091449)
Published Date: September 1997
Author: SIGTTO

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