BS ISO 4268:2000

Foreword
Introduction
1 Scope
2 Normative references
3 Introduction to precautions
4 Precautions relating to procedures
5 Precautions relating to safety
      5.1 Introduction
      5.2 General safety precautions
      5.3 Special safety precautions
6 Equipment
7 Portable electronic thermometers (PETs)
      7.1 Introduction
      7.2 Accuracy requirements
      7.3 Sensing elements
      7.4 Electrical safety
      7.5 Selection and operation of portable electronic
             thermometers
8 Liquid-in-glass thermometers
      8.1 General
      8.2 Accuracy and resolution
      8.3 Specifications
      8.4 General requirements for liquid-in-glass
             thermometers
      8.5 Periodic checks of liquid-in-glass thermometers
9 Precautions to be taken when selecting and using
      liquid-in-glass thermometers
      9.1 Selection of thermometers
      9.2 Detection and prevention of errors in liquid-in-
             glass thermometers
      9.3 Emergent-stem correction
10 Tank sampling methods
      10.1 Cup-case thermometer
      10.2 Flushing-case thermometer
      10.3 Sampling-bottle method
11 Vapour-lock samplers and associated thermometers
      11.1 Vapour-locks on pressurized tanks
      11.2 Outline description
12 Permanently installed spot thermometers
      12.1 Angle-stem thermometers
      12.2 Tank-bottom liquid-in-glass thermometers
      12.3 Accuracy and resolution
13 Bimetal-actuated thermometer with dial
      13.1 Introduction
      13.2 Description
      13.3 Accuracy and resolution
14 Procedures
15 Liquids in pressurized tanks
      15.1 Introduction
      15.2 General principles
      15.3 Equipment
      15.4 Procedures for pressurized tanks
16 Liquids in vapour-tight tanks
      16.1 Introduction
      16.2 General principles
      16.3 Equipment
      16.4 Procedure for vapour-tight tanks
17 Liquids in non-pressurized insulated tanks
      17.1 Introduction
      17.2 Equipment
      17.3 Procedures
      17.4 Vertical cylindrical fixed-roof tanks
      17.5 Floating-roof tanks
      17.6 Horizontal and inclined cylindrical tanks
      17.7 Rail wagons and road vehicles carrying tanks
      17.8 Ship and barge cargo tanks
18 Liquids in non-pressurized non-insulated tanks at
      temperature differing by more than 15 degree C from
      ambient
      18.1 Introduction
      18.2 General principle
      18.3 Equipment
      18.4 Measurement procedure
19 Procedures for the verification of permanently
      installed tank thermometers
      19.1 Introduction
      19.2 Specification of reference thermometer
      19.3 Verification procedure for vertical cylindrical
             tanks
      19.4 Verification procedure for other tanks with
             non-uniform vertical cross-sectional area
20 Procedures for using a permanently installed spot
      thermometer
      20.1 Introduction
      20.2 Location of single-point spot thermometers
      20.3 Specification of thermometers
      20.4 Verification of representivity of single-point
             spot thermometer measurements
      20.5 Procedure for using single-point spot
             thermometers

Gievs the methods, procedures and equipment for the manual measurement fo the temperature of bulk quantities of petroleum and petroleum products in storage tanks.

This International Standard specifies methods, procedures and equipment for the manual measurement of the temperature of bulk quantities of petroleum and petroleum products in storage tanks.

The preferred method is to use a portable electronic thermometer as described in clause7. Other methods included use permanently installed indicating thermometers of the spot-measurement type and temperature determination by sampling methods using cup-case thermometers, flushing-case thermometers, and thermometers within conventional tank samples taken in accordance with ISO3170.

This International Standard excludes averaging thermometers forming part of an automatic gauging system. These are described in ISO4266.

It is realized that, in many countries, some or all of the items covered by this International Standard are the subject of mandatory regulations imposed by the laws of those countries; such regulations must be rigorously observed. In cases of conflict between such mandatory regulations and this International Standard, the former prevails.