ISO 7507-1:2003-12

Content (en)

• Foreword
• Introduction
• Scope
• Normative references
• Terms and definitions
• Precautions Show subsection Close subsection

  • Introduction
  • General precautions
  • Safety precautions
• Equipment
• General requirements
• Circumference measurements Show subsection Close subsection

  • Levels strapped
  • Strapping procedure
  • Repetition of measurement
  • Tolerances
  • Step-overs Show subsection Close subsection

    • Principle
    • Use of step-overs
• Other measurements on tank shell plates Show subsection Close subsection

  • Plate and paint thickness
  • Heights of courses
• Deadwood
• Tank bottoms
• Measurement of tilt
• Floating-roof tanks
• Recalibration
• Computation of tank capacity tables — General rules
• Form of tank capacity tables
• Computation of open capacity Show subsection Close subsection

  • Corrections to measured circumferences Show subsection Close subsection

    • General
    • Step-overs
    • Double-sided obstructions
    • Single-sided obstructions
    • Plate and paint thickness
    • Temperature
  • Systematic calculation
• Construction of final tables Show subsection Close subsection

  • Deadwood
  • Tank bottoms
  • Floating-roof tanks — Additional calculations to be applied
• Specification for equipment used in strapping (normative) Show subsection Close subsection

  • Strapping tape
  • Spring balance
  • Step-over
  • Tape positioners and cords
  • Littlejohn grip
  • Dip-tape
  • Dip-weight
• Recommendations for monitoring, checking and verification of tank calibration and capacity table (informative) Show subsection Close subsection

  • Introduction
  • Scope
  • Recalibration and recalculation
  • Criteria for deciding significance of change
  • Recalibration of the tank Show subsection Close subsection

    • Factors influencing the need for recalibration
    • Recommendations for assessment of the need for recalibration
    • Structural alterations to tanks
  • Recalculation of the tank capacity tables due to operational changes Show subsection Close subsection

    • Factors which generate a need for recalculation
    • Tank shell temperature
    • Density changes
    • Floating-roof corrections
    • Changes in dipping datum-point
    • Changes to tank deadwood
• Tank calibration data and calculation sheet (informative)
• Tank calibration uncertainties (informative) Show subsection Close subsection

  • Introduction
  • Symbols
  • Calculations
  • Source uncertainties Show subsection Close subsection

    • Strapping tape length
    • Strapping tape reading
    • Strapping tape tension and position
    • Uncertainties of tape alignment
    • Uncertainties of obstructions
  • Uncertainties of internal circumference at calibration conditions Show subsection Close subsection

    • Measured external circumference
    • Uncertainties of volume at calibration conditions (extended raw volume) Show subsection Close subsection

      • Source uncertainties
      • Uncertainty of course averaging
      • Uncertainty of tank shape
      • Uncertainty of tank tilt
      • Tank bottom
      • Uncertainty due to floating roof/screen and deadwood
      • Additional uncertainties
      • Uncertainties of metal and paint thickness
      • Internal circumference
      • Internal radius
      • Internal cross-sectional area
      • Raw volume
      • Tank tables
      • Expanded uncertainty of volume at calibration conditions
    • Uncertainties of volume at reference conditions Show subsection Close subsection

      • Source uncertainties
      • Measurements and calculations
      • Deformation due to hydrostatic head at reference conditions
      • Correction for thermal expansion of tank and strapping tape at reference conditions
      • Additional hydrostatic uncertainties
      • Expanded uncertainty of volume in the tank capacity table
      • Examples
• Tank shell temperature determination (informative) Show subsection Close subsection

  • General
  • Determination of the tank shell temperature
  • Simplified equation for tank shell temperature
• Gauge tape temperature correction (normative) Show subsection Close subsection

  • Introduction
  • Calculation procedures Show subsection Close subsection

    • General
    • Tanks with no insulation
    • Tanks with insulation
    • Tanks with non-contact and non-invasive automatic tank gauging (ATG) systems
• Expansion due to liquid head (informative) Show subsection Close subsection

  • General
  • Removal of the effect of expansion at time of strapping
  • Addition of effects of expansion in service
  • Example of computation of allowances for expansion under head of liquid Show subsection Close subsection

    • Calibration by strapping
    • Removal of the effect of expansion at time of measurement
    • Addition of the effects of expansion in service
• Expansion due to temperature (normative) Show subsection Close subsection

  • Introduction
  • General
  • Preparation of tank capacity tables at any standard temperature of certification
  • Correction to be applied to volumes obtained from tank capacity tables certified at a standard temperature T Show subsection Close subsection

    • Principle
    • Tanks with thermally insulated shells
    • Tanks without thermal insulation
• Certificate of calibration (normative)
• Bibliography