Why Tank Gauging?
Tank Gauging is essential to determine the inventory of liquid bulk storage tanks.
The following types of operation can be categorised:
nInventory Control
nCustody Transfer
nOil Movement & Operations
nLeak Control & Reconciliation
Inventory Control
nImportant ‘management tool’ for any refinery, terminal and storage company. (How rich are we today?)
nCan be based on volume and/or Mass
nIn-plant accuracy requirements are less critical with independent storage companies and terminals. Reliability and repeatability are much more important.
Custody Transfer
Measurement of product transfer between ship and shore and/or shore and pipeline transmission systems.(Batch dependant).
nUse as verification tool for Flow meters.
nWhere Custody Transfer or assessment of taxes, duties or royalties are involved, the complete system must be officially approved and certified.
Oil Movement & Operations
nMeasurement and repeatability are more important than the absolute accuracy
nRequires compatibility with control and management systems, such as PLC, SCADA and DCS systems.nSystem must be flexible due to integration of field instruments
Leak Control & Reconciliation
nIncreased awareness of the environmental impact of the industry nPrograms are initiated to reduce the risk of damage of the environment
nMore accurate information is generated for reconciliation, using the latest technology
Requirements Automatic Tank Gauging
nAn Automatic Tank Gauging System should provide the following information:
nDetailed and up-to-date measured data (Level, temperature, water, Density)
nSynchronous Inventory data (T.O.V., G.O.V., G.S.V., S&W, Mass and N.S.V.)
nReports (detailed and grouped data)
nAlarms (Real-time & historical)
nTrending
nSimple, non confusing GUI, adapted to local site