ISO 4266-4:2023
Petroleum and liquid petroleum products — Measurement of level and temperature in storage tanks by automatic methods — Part 4: Measurement of temperature in atmospheric tanks
This document gives requirements and guidance on the selection, accuracy, installation, commissioning, calibration and verification of automatic tank thermometers (ATTs) in fiscal/custody transfer applications.
The ATT is used for measuring the temperature of petroleum and liquid petroleum products having a Reid vapour pressure less than 100 kPa, stored in atmospheric storage tanks.
This document is not applicable to the measurement of temperature in caverns or in refrigerated storage tanks.
| Get this standard | Prices exclude GST | |
|---|---|---|
| PDF ( Single user document) |
$190.00 NZD
|
|
| HardCopy |
$238.00 NZD
|
|
| Networkable PDF |
Price varies
|
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Precautions
4.1 Safety precautions
4.2 Equipment precautions
4.3 General precautions
5 Accuracy
5.1 General
5.2 Intrinsic error of ATTs
5.3 Calibration prior to installation
5.3.1 General
5.3.2 ATT calibrated as a system
5.3.3 ATT calibrated by components
5.3.4 Multiple-point ATTs
5.3.5 Variable-length ATTs
5.3.6 Uncertainty of the reference
5.4 Error caused by installation and operating conditions
5.5 Overall accuracy
5.5.1 General
5.5.2 Use of ATT for fiscal/custody transfer purposes
6 Selection of ATTs
6.1 General
6.2 ATTs for fiscal/custody transfer purposes
7 Description of ATT equipment
7.1 General
7.2 Electrical temperature elements
7.2.1 Resistance temperature detectors
7.2.2 Other temperature elements
8 Installation of ATTs
8.1 General
8.2 Single-point (spot) temperature elements
8.3 Averaging temperature elements
8.3.1 General
8.3.2 Upper, middle and lower temperature elements
8.3.3 Multiple-point temperature elements
8.3.4 Variable-length RTD temperature elements
8.3.5 Mid-level temperature element
8.3.6 Moveable spot temperature element
8.4 Thermowells for electronic temperature elements
9 Calibration and field verification of ATTs
9.1 General
9.2 Calibration of single-point, or mid-level temperature element ATTs for fiscal/custody transfer purposes
9.2.1 Calibration prior to installation
9.2.2 Initial field verification
9.3 Calibration of upper, middle and lower or multiple-point ATTs for fiscal/custody transfer purposes
9.3.1 Calibration prior to installation
9.3.2 Initial field verification
9.4 Calibration of variable-length ATTs for fiscal/custody transfer purposes
9.4.1 Calibration prior to installation
9.4.2 Initial field verification
9.5 Subsequent verification of ATTs
9.5.1 General
9.5.2 Frequency of subsequent verification
9.5.3 Record keeping
10 Data communication and receiving
Bibliography
Previous versions
Keep me up-to-date
Sign up to receive updates when there are changes to this standard
Related Information
Similar Standards
-
BS 7550-1:1992
Calibration of spherical tanks for refrigerated light-hydrocarbon fluids in ships, Method of stereo-photogrammetry
-
BS 7550-2:1993
Calibration of spherical tanks for refrigerated light-hydrocarbon fluids in ships, Triangulation method
-
BS 7723-2:1994
Methods for calibration of vertical cylindrical tanks for petroleum and liquid petroleum products, Optical-reference-line method
-
BS 7813:1995
Guide for statistical control of dynamic liquid hydrocarbon volumetric metering systems
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Precautions
4.1 Safety precautions
4.2 Equipment precautions
4.3 General precautions
5 Accuracy
5.1 General
5.2 Intrinsic error of ATTs
5.3 Calibration prior to installation
5.3.1 General
5.3.2 ATT calibrated as a system
5.3.3 ATT calibrated by components
5.3.4 Multiple-point ATTs
5.3.5 Variable-length ATTs
5.3.6 Uncertainty of the reference
5.4 Error caused by installation and operating conditions
5.5 Overall accuracy
5.5.1 General
5.5.2 Use of ATT for fiscal/custody transfer purposes
6 Selection of ATTs
6.1 General
6.2 ATTs for fiscal/custody transfer purposes
7 Description of ATT equipment
7.1 General
7.2 Electrical temperature elements
7.2.1 Resistance temperature detectors
7.2.2 Other temperature elements
8 Installation of ATTs
8.1 General
8.2 Single-point (spot) temperature elements
8.3 Averaging temperature elements
8.3.1 General
8.3.2 Upper, middle and lower temperature elements
8.3.3 Multiple-point temperature elements
8.3.4 Variable-length RTD temperature elements
8.3.5 Mid-level temperature element
8.3.6 Moveable spot temperature element
8.4 Thermowells for electronic temperature elements
9 Calibration and field verification of ATTs
9.1 General
9.2 Calibration of single-point, or mid-level temperature element ATTs for fiscal/custody transfer purposes
9.2.1 Calibration prior to installation
9.2.2 Initial field verification
9.3 Calibration of upper, middle and lower or multiple-point ATTs for fiscal/custody transfer purposes
9.3.1 Calibration prior to installation
9.3.2 Initial field verification
9.4 Calibration of variable-length ATTs for fiscal/custody transfer purposes
9.4.1 Calibration prior to installation
9.4.2 Initial field verification
9.5 Subsequent verification of ATTs
9.5.1 General
9.5.2 Frequency of subsequent verification
9.5.3 Record keeping
10 Data communication and receiving
Bibliography