BS ISO 4266-3:2002

1 Scope
2 Normative reference
3 Terms and definitions
4 Precautions
  4.1 Safety precautions
  4.2 Equipment precautions
  4.3 General precautions
5 Accuracy
  5.1 Intrinsic error of ALGs
  5.2 Calibration prior to installation
  5.3 Error caused by installation and operating conditions
  5.4 Overall accuracy
      5.4.1 General
      5.4.2 Use of ALGs for fiscal/custody transfer applications
6 Installation of ALGs
  6.1 General
  6.2 Mounting location
  6.3 Manufacturer's requirements
  6.4 Installation
      6.4.1 Installation of intrusive ullage ALGs (e.g.
            float-operated and servo-operated type) mounted
            on still-wells
      6.4.2 Installation of intrusive ullage ALGs (e.g. float
            and servo-operated types) using guide wires
      6.4.3 Installation of non-intrusive ullage ALGs (e.g.
            microwave or radar) mounted on still-wells
      6.4.4 Location of ALG
      6.4.5 Installation of ALGs other than those described
            in this part of ISO 4266
  6.5 Still-well design
7 Initial setting and initial verification of ALGs in the field
  7.1 Preparation
      7.1.1 Check for critical distances
      7.1.2 Check for free movement of level-sensing
            element of intrusive ALGs
      7.1.3 Check for influences of changes in physical
            and electrical properties of the product (vapour/liquid)
  7.2 Initial setting
      7.2.1 General
      7.2.2 Setting of intrusive ullage ALGs
      7.2.3 Setting of non-intrusive ALGs
      7.2.4 Other ALGs not described in this part of ISO 4266
  7.3 Initial field verification
      7.3.1 Introduction
      7.3.2 Verification procedure
      7.3.3 Tolerance of initial field verification
  7.4 Record keeping
8 Subsequent verification of ALGs
  8.1 General
  8.2 Frequency of subsequent verification
  8.3 Procedure
  8.4 Tolerance for subsequent verification of ALGs in
      fiscal/custody transfer application
  8.5 Comparison of the ALG readings from current and
      previous verifications
  8.6 Adjustment in subsequent verification
9 Data communication and receiving
Bibliography

Provides guidance on the accuracy, installation, commissioning, calibration and verification of automatic level gauges (ALGs) both intrusive and non-intrusive, for measuring the level of petroleum and petroleum products having a vapour pressure less than 4 MPa, stored in pressurized storage tanks.

This part of ISO4266 gives guidance on the accuracy, installation, commissioning, calibration and verification of automatic level gauges (ALGs) both intrusive and non-intrusive, for measuring the level of petroleum and petroleum products having a vapour pressure less than 4MPa, stored in pressurized storage tanks.

This part of ISO4266 gives guidance on the use of ALGs in custody transfer application.

This part of ISO4266 is not applicable to the measurement of level in caverns and refrigerated storage tanks with ALG equipment.