BS 7812:1995 Guide for selection, specification, installation, operation and maintenance of automatic liquid level and temperature measuring instruments on petroleum storage tanks
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1.1 This International Standard gives guidance on the selection, specification, installation, operation and maintenance of mechanical and servo-operated automatic tank gauging systems measuring level and temperature in petroleum storage tanks which are at or near atmospheric temperature and pressure, or used under pressure, or for the storage of heated liquid petroleum products.
This International Standard does not apply to tank gauging systems using other sensing principles, such as radar and optical methods.
NOTE 1 Automatic level gauges may be used with either manual or automatic temperature measurement and automatic temperature measurement may be used with either manual or automatic level gauging.
The provisions of this International Standard are intended to ensure a sufficiently high degree of accuracy to meet the requirements of normal commercial operation.
This International Standard does not apply to level and temperature measurement systems for refrigerated hydrocarbon liquids, for which reference should be made to ISO 8309 and ISO 8310.
1.2 The provisions of this International Standard are intended to meet the requirements of accuracy necessary for custody transfer purposes. However, automatic level gauges are widely used for monitoring the movements of oil to and from storage tanks for stock control, for which a lower standard of accuracy may be acceptable.
1.3 The user of automatic tank gauging systems should consult the system manufacturer for details of any specific requirements not covered in this International Standard.
BS 7812:1995 Guide for selection, specification, installation, operation and maintenance of automatic liquid level and temperature measuring instruments on petroleum storage tanks