BS ISO 15169:2003

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 General precautions
  4.1 Safety precautions
  4.2 Equipment precautions
5 Selection and installation of hybrid tank measurement
  system equipment
  5.1 General
  5.2 Automatic level gauge
  5.3 Pressure sensor(s)
  5.4 Automatic tank thermometer (ATT)
  5.5 Hybrid processor
  5.6 Optional sensors
6 Accuracy effects of HTMS components
  6.1 General
  6.2 Accuracy effects of the ALG
  6.3 Accuracy effects of the pressure sensor(s)
  6.4 Accuracy effects of the ATT
7 HTMS measurement and calculations
  7.1 General
  7.2 HTMS Mode 1
  7.3 HTMS Mode 2
8 Commissioning and initial field calibration
  8.1 General
  8.2 Initial preparation
  8.3 Initial calibration and verification of HTMS
      components
  8.4 Verification of hybrid processor calculations
  8.5 Initial field verification of HTMS
9 Subsequent verification
  9.1 General
  9.2 Objectives
  9.3 Adjustment during regular verification
  9.4 Subsequent verification of HTMS in volume-based
      custody transfer application
  9.5 Subsequent verification of HTMS in mass-based
      custody transfer applications
  9.6 Handling out-of-tolerance situations during
      regular verification of HTMS in custody
      transfer application
Annex A (informative) Calculation overview
Annex B (informative) Measurement accuracy and
                      uncertainty analysis

Gives guidance on the selection, installation, commissioning, calibration and verification of hybrid tank measurement systems (HTMS) for the measurement of level, static mass, observed and standard volume, and observed and reference density in tanks storing petroleum and petroleum products in fiscal or custody transfer application.

This International Standard gives guidance on the selection, installation, commissioning, calibration and verification of hybrid tank measurement systems (HTMS) for the measurement of level, static mass, observed and standard volume, and observed and reference density in tanks storing petroleum and petroleum products in fiscal or custody transfer application. As it is a matter for the user to decide which measurements (i.e. volume, or mass or both) are used for custody transfer purposes, this International Standard includes an uncertainty analysis, with examples, to enable users to select the correct components of an HTMS to address the intended application.

This International Standard is applicable to stationary, vertical cylindrical tanks storing liquid hydrocarbons with a Reid Vapour Pressure (RVP) below 103,42kPa.

This International Standard is not applicable to pressurized tanks or marine applications.

NOTE1 The term “mass” is used to indicate mass in vacuum (true mass). In the petroleum industry, it is not uncommon to use apparent mass (in air) for commercial transactions. Guidance is provided on the calculation of both mass and apparent mass in air (see AnnexA).

NOTE2 The calculation procedures in this International Standard can also be applied to tanks with other geometries, which have been calibrated by a recognized oil-industry method (e.g. ISO7507). Examples of uncertainty analysis for spherical and horizontal cylindrical tanks are given in AnnexB.