Main Findings
Dip tapes are still a highly regarded method of level measurement in gasoline storage tanks, despite the scope for measurement inconsistency. Dip tapes are also used in the initial installation and calibration of many automatic tank gauging systems.
It was found that out of the methods identified the main level measurement systems used in the gasoline storage industry are:
• Servo-operated float gauges;
• Radar tank gauges;
• Air bubblers;
• Surface detector gauges (plumb-bob);
• Float-operated, wire-guided, inductively coupled gauges.
From those named, radar level measurement and servo gauge level measurement systems are by far the most commonly used by the UK gasoline fuel storage industry. Gasoline does not have a major detrimental effect on servo-operated float gauge systems, so long as care is taken to ensure that suitable materials are used for seals and gaskets. However some corrosive bio-fuel additives can damage these gauges. This can be problematic because over the serviceable life of some tanks they may be used to store both bio-fuel and gasoline.
Level switches which are normally associated with high or ‘Hi-Hi’ level detection or alarm initiation for gasoline storage tanks were:
• Vibration switches;